Journal articles: 'Titanian magnetite'

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Nishio, Ikuya, Tomoaki Morishita, Kristofer Szilas, Graham Pearson, Ken-Ichiro Tani, Akihiro Tamura, Yumiko Harigane, and Juan Guotana. "Titanian Clinohumite-Bearing Peridotite from the Ulamertoq Ultramafic Body in the 3.0 Ga Akia Terrane of Southern West Greenland." Geosciences 9, no. 4 (April 1, 2019): 153. http://dx.doi.org/10.3390/geosciences9040153.

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A titanian clinohumite-bearing dunite was recently found in the Ulamertoq ultramafic body within the 3.0 Ga Akia Terrane of southern West Greenland. Titanian clinohumite occurs as disseminated and discrete grains. Titanian clinohumite contains relatively high amounts of fluorine, reaching up to 2.4 wt.%. The high-Fo content of olivine (Fo93) coupled with low Cr/(Cr + Al) ratio of orthopyroxene implies that the dunite host is not of residual origin after melt extraction by partial melting of the primitive mantle. Olivine grains are classified into two types based on abundances of opaque mineral inclusions: (1) dusty inclusion-rich and (2) clear inclusion-free olivines. Opaque inclusions in coarse-grained olivines are mainly magnetite. Small amounts of ilmenite are also present around titanian clinohumite grains. The observed mineral association indicates partial replacement of titanian clinohumite to ilmenite (+magnetite) and olivine following the reaction: titanian clinohumite = ilmenite + olivine + hydrous fluid. The coexistence of F-bearing titanian clinohumite, olivine, and chromian chlorite indicates equilibration at around 800–900 °C under garnet-free conditions (<2 GPa). Petrological and mineralogical characteristics of the studied titanian clinohumite-bearing dunite are comparable to deserpentinized peridotites derived from former serpentinites. This study demonstrates the importance of considering the effects of hydration/dehydration processes for the origin of ultramafic bodies found in polymetamorphic Archaean terranes.

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Xie, L., R. C. Wang, D. Z. Wang, and J. S. Qiu. "A survey of accessory mineral assemblages in peralkaline and more aluminous A-type granites of the southeast coastal area of China." Mineralogical Magazine 70, no. 6 (December 2006): 709–29. http://dx.doi.org/10.1180/0026461067060362.

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AbstractAn extensive belt of A-type granite exists along the southeast coast of China. The granites are divided into peralkaline and more aluminous subgroups which differ in mineral assemblages, mineral compositions and textures. In the peralkaline subgroup, primary magmatic Th-rich zircon is typically overgrown by Th-poor zircon containing thorite micro-inclusions. REE minerals in this subgroup are dominated by allanite-(Ce), chevkinite-(Ce), titanite and pyrochlore. Fe-Ti oxides are titanian magnetite and Mn-rich ilmenite. In contrast, in the more aluminous subgroup rocks, zircon is weakly zoned and exhibits very low Th but relatively high U contents. The REE minerals are dominated by Th-rich monazite-(Ce). Titanium-poor magnetite, pyrophanite and rutile are the major Fe-Ti oxides. These occurrences indicate that peralkaline magmas favour the formation of REE silicates, whereas magmas with higher alumina saturation stabilize REE phosphates. Peralkaline granites crystallized at temperatures 50–100°C greater than the more aluminous granites, but under lower oxidation conditions. These differences in formation conditions of the two A-type granite subgroups, deduced by accessory mineralcharacteristics, are inferred to be related to magma derivation at different crustal levels, with peralkaline magma deriving from a deeper crustal level with more mantle input.

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Mitchell, R. H., and Fareeduddin. "Mineralogy of peralkaline lamproites from the Raniganj Coalfield, India." Mineralogical Magazine 73, no. 3 (June 2009): 457–77. http://dx.doi.org/10.1180/minmag.2009.073.3.457.

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AbstractTwo mineralogically distinct lamproites occurring as dykes in the Raniganj coalfield of eastern India are described in terms of a mineralogical-genetic classification as: (1) peralkaline olivine-ilmenitephlogopite- K-feldspar lamproite (var. Damodar); and (2) peralkaline pseudoleucite-phlogopite-amphibole- K-feldspar lamproite (var. Damodar). Compositional and paragenetic data are provided for major, accessory and trace minerals. Minerals common to both rocks include: chlorite-pseudomorphed phenocrystal olivine, phenocrystal Ti-rich Al-poor phlogopite and tetraferriphlogopite, groundmass potassic amphiboles, Sr-rich apatite and monazite-(Ce), late stage Na-poor K-feldspar and quartz. The rocks differ in terms of the character of the amphiboles (Ti-potassian arfvedsonite vs. K-richterite– K-magnesioarfvedsonite–K-arfvedsonite solid solution), spinel compositions (qandilite–chromite– magnetite vs. chromite–ulvöspinel–magnetite), the presence or absence of: pseudoleucite, microphenocrystal magnesian ilmenite, diopside, titanian aegirine, lorenzenite, an unamed Ti-silicate, an unnamed Mg-Zr silicate, bazirite, rutile, dolomite and norsethite. The rocks are considered to be members of a spectrum of modally-diverse peralkaline rocks, formed from a common parental magma produced by the partial melting of the ancient metasomatized lithospheric mantle of the northern Singhbhum craton. None of the rocks can be considered as aillikites, minettes, orangeites or kimberlites.

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Mitchell, R. H., and F. A. Belton. "Cuspidine-sodalite natrocarbonatite from Oldoinyo Lengai, Tanzania: a novel hybrid carbonatite formed by assimilation of ijolite." Mineralogical Magazine 72, no. 6 (December 2008): 1261–77. http://dx.doi.org/10.1180/minmag.2008.072.6.1261.

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AbstractA unique hybrid natrocarbonatite, collected from the new ash cone of the volcano Oldoinyo Lengai. Tanzania in July 2008, consists of phenocrysts of nyerereite and gregoryite together with xenocrysts of clinopyroxene, nepheline and Ti-andradite set in a groundmass of cuspidine, sodalite, ferroan manganoan monticellite, K-Fe sulphide and manganoan titanian magnetite and gregoryite. The xenocrysts were not in equilibrium with the melt which formed their current host, as clinopyroxenes and Ti-andradite are mantled by cuspidine, and nepheline by sodalite and phlogopite—potassian kinoshitalite solid solutions. A microxenolith of ijolite exhibits similar reaction phenomena. The minerals of the xenocryst suite have similar compositions to plutonic ijolites found at Oldoinyo Lengai, and are thus considered to be derived by the fragmentation of such material in a previously contaminated natrocarbonatite melt. The latter, which has cuspidine, sodalite and monticellite as primary liquidus phases, is considered to have been formed by the complete assimilation of ijolitic material in a natrocarbonatite magma at depth in the volcano conduit. The occurrence of trace amounts of cuspidine, Fe-Mn-monticellite, K-Fe sulphide and Mn-Ti-spinel in recently erupted natrocarbonatites is ascribed to similar, but less extensive, assimilation of silicate material prior to their eruption.

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Mitchell, Roger H., R. Garth Platt, Maureen Downey, and David G. Laderoute. "Petrology of alkaline lamprophyres from the Coldwell alkaline complex, northwestern Ontario." Canadian Journal of Earth Sciences 28, no. 10 (October 1, 1991): 1653–63. http://dx.doi.org/10.1139/e91-147.

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A suite of alkaline lamprophyre dikes emplaced in centers I and II rocks of the Coldwell alkaline complex is composed of camptonites with calcite ocelli, camptonites with quartz macrocrysts, amphibole camptonites, monchiquites, and sannaites. The camptonites are characterized by phenocrysts of olivine, aluminian pyroxene, kaersutite, and titanian ferropargasite set in a matrix of magnesian hastingsite, augite, plagioclase, biotite, magnetite, sphene, and minor nepheline. Quartz macrocrysts occur as corroded euhedral single crystals. Monchiquites are petrographically similar to the camptonites but are characterized by the presence of an isotropic groundmass. Sannaites contain aluminian and chromian diopside phenocrysts set in a matrix of ferroan pargasite, aluminian diopside, biotite, albitized plagioclase, and epidotized alkali feldspar.Major-element compositions indicate the ocellar camptonites, amphibole camptonites, and monchiquites have affinities with alkali olivine basalt and that monchiquites and camptonites are heteromorphs. None of the dikes represent primitive liquids. Poor correlations between incompatible trace elements (Sr, Ba, Nb, Zr, rare earths), together with the presence of reversely zoned and corroded phenocrysts, suggest that none of the lamprophyres represent single batches of magma. The lamprophyres are considered to be hybrid magmas, formed by the mixing of fragmented cumulates, several generations of phenocrysts, and batches of magma extracted from a continuously replenished evolving magma chamber located within the infrastructure of the complex. Quartz-bearing camptonites are considered to form by contamination of camptonites, although the source of the quartz cannot be determined.

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Geldenhuys, I. J., Q. G. Reynolds, and G. Akdogan. "Evaluation of Titania-Rich Slag Produced from Titaniferous Magnetite Under Fluxless Smelting Conditions." JOM 72, no. 10 (August 3, 2020): 3462–71. http://dx.doi.org/10.1007/s11837-020-04304-3.

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Abstract Titanium-bearing magnetite ore is generically defined as magnetite with > 1% titanium dioxide (TiO2) and is usually vanadium-bearing. The iron and titanium occur as a mixture of magnetite (Fe3O4) and ilmenite (FeTiO3) with vanadium oxide usually occurring within the solid solution of the titanium-bearing magnetite phase. These ores are currently widely processed in blast furnaces via modified ironmaking processes. Typically, vanadium is recovered as a by-product from the ironmaking process, while the diluted titania slag is stockpiled. Fluxless smelting in a direct-current open-arc furnace is proposed as an opportunity to improve iron and vanadium recovery and potentially unlock the titanium as a slag product. Slags produced from a pilot study are compared to industrial slags produced from ilmenite. The findings from the pilot test show that slag produced under fluxless smelting conditions in an open-arc electric furnace is remarkably similar to industrial ilmenite slags. The test conditions were varied to evaluate the slag and metal composition, and furnace operation, under increasing reducing conditions. The study showed that the slag and metal product was remarkably similar to industrial slag produced from ilmenite.

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Song, Hanlin, Jinpeng Zhang, and Xiangxin Xue. "Kinetics on Chromium-Bearing Vanadia-Titania Magnetite Smelting with High-Basicity Pellet." Processes 9, no. 5 (May 6, 2021): 811. http://dx.doi.org/10.3390/pr9050811.

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The effects of high-basicity pellet on smelting chromium-bearing vanadia-titania magnetite are investigated via thermodynamic smelting and non-isothermal kinetics experiments. The thermodynamic results indicated that the high-basicity pellet significantly affects and ameliorates the softening-melting-dripping behaviors during the smelting process. As the high-basicity pellet ratio increased from 0 wt.% to 52 wt.%, the range of softening temperature [T40–T4] decreased from 121 °C to 84 °C and the melting-dripping temperature [Td–Ts] decreased from 224 °C to 169 °C. Moreover, the apparent activation energy of non-isothermal kinetics also decreased from 99.91 kJ·mol−1 to 66.74 kJ·mol−1. Additionally, the reaction mechanism of high-basicity pellet on smelting chromium-bearing vanadia-titania magnetite was investigated via thermodynamic calculations of Gibbs free energy and characterizations of the titanium slag. Therefore, combined with the lowest permeability index, the fastest non-isothermal reduction rate, the highest recovery of valuable elements and the minimum content of titanium carbonitride, the preferable high-basicity pellet ratio was considered to be 11~23 wt.%.

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Gerasimova, Lidia G., Anatoly I. Nikolaev, Ekaterina S. Shchukina, and Marina V. Maslova. "Titanite-Containing Mineral Compositions and Their Chemical Treatment with Preparation of Functional Materials." Materials 13, no. 7 (April 1, 2020): 1599. http://dx.doi.org/10.3390/ma13071599.

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The waste of apatite-nepheline ore processing was chosen as the material of study for the present investigation. The chemical and phase compositions have been analyzed and the route of the new technology has been developed. Treatment of the waste with diluted hydrochloric acid enables to separate apatite, nepheline, titano-magnetite minerals from titanite (CaSiTiO5). The obtained titanite concentrate contains 30–32% of titanium dioxide. Interaction of titanite with hydrochloric acid under heating and stirring conditions results in calcium leaching. The titanite decomposition is accompanied by titanium and silica oxides precipitation. The resulting solid has been used as a precursor for the synthesis of functional materials. Mechanochemical activation of the precursor provides the structural and morphological disorder of the initial particles. Thermodynamic stability of activated particles is achieved by chemisorption or roasting.

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Kazakov, D. A., V. V. Vol’khin, K. Kaczmarski, Yu O. Gulenova, M. N. Obirina, and D. A. Rozhina. "Catalytic Ozonation of 4-Nitrophenol in the Presence of Magnetically Separable Titanium Dioxide – Magnetite Composite." Eurasian Chemico-Technological Journal 17, no. 4 (April 2, 2016): 309. http://dx.doi.org/10.18321/ectj275.

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This paper deals with determining catalytic activities of titania (TiO2) with various crystalline structures and magnetite (Fe3O4) during mineralization of 4-nitrophenol in aqueous media by ozonation. Among the titania samples under study, amorphized TiO2 was shown to have the highest catalytic activity, while magnetite was characterized by the lowest catalytic activity. A procedure is proposed to synthesize a magnetically separable composite (TiO2/Fe3O4) including amorphized titania and magnetite phases, which involves deposition of a catalytically active titania phase on preformed magnetite particles. We also studied the effect of mass ratio of titania and magnetite phases in the composite on its catalytic activity during 4-nitrophenol mineralization by ozonation. It was found that catalytic activity of composite increased as the amorphized titania phase was doped with magnetite phase up to 30% wt but as the magnetite portion in the composite catalyst was further increased, its activity decreased. According to Fourier transform infrared (FTIR) spectroscopy, content of catalytically active sites (hydroxyl groups of titania) in the composite catalyst decreases as compared to the pure phase of amorphized titania. Increase in catalytic activity of the composite as its magnetite content increases to 30% wt can be attributed to increase of accessibility of catalytically active sites (OH groups) for ozone, because specific surface area and total pore volume of the composite catalyst as determined by BET increase as compared to amorphized TiO2 and catalytically active titania phase is located mostly on surface of magnetite particles which is indicated by scanning electron microscopy (SEM) results and electrophoretic light scattering (ELS) data. It was shown that the obtained composite catalyst of optimized composition, in spite of its fine particles, can be easily recovered from aqueous phase by magnetic field and used repeatedly in ozonation in order to promote water purification process.

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Wojciechowska, Agnieszka, and Zofia Lendzion-Bieluń. "Synthesis and Characterization of Magnetic Nanomaterials with Adsorptive Properties of Arsenic Ions." Molecules 25, no. 18 (September 9, 2020): 4117. http://dx.doi.org/10.3390/molecules25184117.

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A new synthesis method of hybrid Fe3O4/C/TiO2 structures was developed using microwave-assisted coprecipitation. The aim of the study was to examine the effect of the addition of glucose and titanium dioxide on adsorptive properties enabling removal of arsenic ions from the solution. The study involved the synthesis of pure magnetite, magnetite modified with glucose and magnetite modified with glucose and titanium dioxide in magnetite: glucose: titanium dioxide molar ratio 1:0.2:3. Materials were characterized by XRD, FT-IR, and BET methods. Magnetite and titanium dioxide nanoparticles were below 20 nm in size in obtained structures. The specific surface area of pure magnetite was approximately 79 m2/g while that of magnetite modified with titanium dioxide was above 190 m2/g. Obtained materials were examined as adsorbents used for removal As(V) ions from aqueous solutions. Adsorption of arsenic ions by pure magnetite and magnetite modified with titanium dioxide was very high, above 90% (initial concentration 10 mg/L), pH in the range from 2 to 7. The preparation of magnetic adsorbents with a high adsorption capacity of As(V) ions was developed (in the range from 19.34 to 11.83 mg/g). Magnetic properties enable the easy separation of an adsorbent from a solution, following adsorption.

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Rudashevsky, N. S., A. M. McDonald, L. J. Cabri, T. F. D. Nielsen, C. J. Stanley, Yu L. Kretzer, and V. N. Rudashevsky. "Skaergaardite, PdCu, a new platinum-group intermetallic mineral from the Skaergaard intrusion, Greenland." Mineralogical Magazine 68, no. 4 (August 2004): 615–32. http://dx.doi.org/10.1180/0026461046840208.

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AbstractSkaergaardite, PdCu, is a new mineral discovered in the Skaergaard intrusion, Kangerdlugssuaq area, East Greenland. It occurs in a tholeitiic gabbro associated with plagioclase, clinopyroxene, orthopyroxene, ilmenite, titanian magnetite, fayalite and accessory chlorite-group minerals, ferrosaponite, a member of the annite–phlogopite series, hornblende, actinolite, epidote, calcite, ankerite, apatite and baddeleyite. The mineral is found in composite microglobules composed of bornite, chalcocite, digenite, chalcopyrite, with rare cobalt pentlandite, cobaltoan pentlandite, sphalerite, keithconnite, vasilite, zvyagintsevite, (Cu,Pd,Au) and Pt-Fe-Cu-Pd alloys, unnamed PdCu3, (Pd,Cu,Sn), Au3Cu and PdAuCu. Skaergaardite occurs as droplets, equant grains with rounded outlines, subhedral to euhedral crystals and as irregular grains that vary in size from 2 to 75 μm, averaging 22 μm. It is steel grey with a bronze tint, has a black streak, a metallic lustre and is sectile. Neither cleavage nor fracture was observed. The mineral has a micro-indentation hardness of VHN25 = 257. It is isotropic, non-pleochroic and exhibits neither discernible internal reflections nor evidence of twinning. Skaergaardite varies from bright creamy white (associated with bornite and chalcopyrite) to bright white (associated with digenite and chalcocite). Reflectance values in air (and in oil) are: 58.65 (47.4) at 470 nm, 62.6 (51.1) at 546 nm, 64.1 (52.8) at 589 nm and 65.25 (53.95) at 650 nm. The average of 311 electron-microprobe analyses gives: Pd 58.94, Pt 1.12, Au 2.23, Cu 29.84, Fe 3.85, Zn 1.46, Sn 1.08, Te 0.28 and Pb 0.39, total 99.19 wt.%, corresponding to (Pd0.967Au0.020Pt0.010)Σ0.997(Cu0.820Fe0.120 Zn0.039Sn0.016Te0.004Pb0.003)Σ1.002. The mineral is cubic, space group Pm3m, a = 3.0014(2) Å, V = 27.0378 Å3, Z = 1. Dcalc is 10.64 g/cm3. The six strongest lines in the X-ray powder-diffraction pattern [d in Å (I)(hkl)] are: 2.122(100)(110), 1.5000(20)(200), 1.2254(50)(211), 0.9491(20)(310), 0.8666(10)(222), 0.8021(70)(321). The mineral has the CsCl-type structure. It is believed to be isostructural with wairauite (CoFe), synthetic CuZn (β-brass) and is structurally related to hongshiite (PtCu). Skaergaardite developed from a disordered Pd-Cu-rich metal alloy melt that had exsolved from an earlier Cu-(Fe) sulphide melt. Ordering of Pd and Cu (beginning at T ≈ 600°C) results in development of the CsCl structure from a disordered face-centred cubic structure.

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Соколов, А. Э., О. С. Иванова, А. С. Федоров, Е. А. Ковалева, М. А. Высотин, C. R. Lin, and С. Г. Овчинников. "Почему наночастицы магнетит/золото со структурой ядро-оболочка недостаточно хороши и как их улучшить." Физика твердого тела 63, no. 9 (2021): 1367. http://dx.doi.org/10.21883/ftt.2021.09.51312.19h.

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In this paper a short review of experimental and theoretical recent researches of magnetic core-shell nanoparticles with noble metals shell is given. Magnetic nanoparticles of Fe3O4 coated with a gold shell are in demand in many biomedical applications. However, there are practically no good nanoparticles completely and uniformly coated with gold. In this paper, we investigated the formation of a chemical bond at the magnetite/gold interface. In the framework of DFT-GGA calculations, the geometric structure, electronic and magnetic properties of flat layers consisting of Fe3O4 magnetite, titanium, and gold are studied. It is established that the specific energy and wetting parameters of the magnetite-gold interface are negative, while these values of the magnetite-titanium (for thin Ti layers) and magnetite-titanium-gold boundaries are positive. This allows us to hope that an intermediate thin layer of titanium at the boundary between the surface of the magnetite nanoparticle and the gold layer will stabilize this three-layer structure and allow obtaining magnetite nanoparticles coated with a solid gold coating.

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Dmitriev, A. N., G. Yu Vit’kina, and R. V. Alektorov. "Pyrometallurgical processing of high-titaniferous ores." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 76, no. 12 (December 23, 2020): 1219–29. http://dx.doi.org/10.32339/0135-5910-2020-12-1219-1229.

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The future development of Ural mineral and raw materials base of steel industry is considerably stipulated by the development of deposits of titanium-magnetite ores, the reserves of which are accounted for near 77% of iron ores of Urals. It was shown, that the content of titanium dioxide as well as harmful impurities in the titanium-magnetite have the decisive meaning for selection of processing technology of them for extraction out of them vanadium and other useful components. Technological schemes of the titanium-magnetite enrichment and industrial methods of titanium-magnetite concentrates processing considered. Examples of titanium-magnetite processing by coke-BF and coke-less schemes given. The problems of blast furnace melting of titanium-magnetite ores highlighted. Main problems relate to formation of refractory compounds in a form of carbo-nitrides during reduction of titanium and infusible masses in blast furnace hearth. It was shown, that intensification if carbides precipitation is stipulated by increase of intensity of titanium reduction at increased temperatures of a heat products and requires the BF heat to be run at minimal acceptable temperature mode. Technological solutions, necessary to implement in blast furnace for iron ore raw materials with increased content of titanium processing were presented, including increase of basicity of slag from 1.2 to 1.25-1.30, increase of pressure at the blast furnace top from 1.8 to 2.2 atm, decrease of silicon content in hot metal from 0.1 to 0.05%, application of manganese-containing additives. It was noted, that theoretically the blast furnace melting of titanium-magnetite is possible at titanium dioxide content in slag up to 40% when application of the abovementioned technological solutions, silicon content in hot metal to 0.01% and very stable heat conditions of a blast furnace. The actuality of titanium and its pigmental dioxide production increase was noted. Possibilities of development of Medvedevskoje and Kopanskoje deposits of high-titaniferous ores in Chelyabinsk region with extraction not only iron and vanadium but also titanium considered.

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Xu, Runsheng, Wei Wang, Weilin Chen, Bin Jia, and Zhihui Xu. "3D Microstructure and Micromechanical Properties of Minerals in Vanadium-Titanium Sinter." High Temperature Materials and Processes 38, no. 2019 (February 25, 2019): 101–12. http://dx.doi.org/10.1515/htmp-2017-0181.

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AbstractTo investigate the structural characteristics and mechanical properties of minerals in vanadium-titanium sinter, the 3D microstructures of the sinter were reconstructed by serial sectioning in conjunction with computer-aided 3D reconstruction techniques The results show that hematite and magnetite in vanadium-titanium sinter will grow along the longitudinal axis direction and act as a scaffold. The size of magnetite crystals in vanadium-titanium sinter is much smaller than that in traditional sinter. The calcium ferrite in vanadium-titanium sinter is columnar-like, while that in traditional sinter is needle-like. The decreasing order of the microhardness value of minerals in the two sinters is hematite, calcium ferrite, magnetite and silicate, while the fracture toughness value from highest to lowest is calcium ferrite, hematite, magnetite and silicate. The comprehensive hardness value and comprehensive fracture toughness value of vanadium-titanium sinter are both less than these of traditional sinter.

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Qiu, Jun, Xian Jun Lu, Ping Chen, Shu Gang Hu, and Gui Fang Wang. "The SEM and EDS Energy Spectrum Analysis of a Beach Placer." Advanced Materials Research 158 (November 2010): 273–80. http://dx.doi.org/10.4028/www.scientific.net/amr.158.273.

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In order to study the phase of Fe and Ti in a beach placer , different methods such as the X-ray diffraction analysis, chemical analysis, scanning electron microscopic , electron probe microanalysis are used to study the characteristics of the beach placer . The research results show the major metallic mineral in the beach placer is titanic magnetite, EDS and energy spectrum map features of which indicate that the vast majority of titanic magnetite contain a certain amount of Ti , the two elements of Fe and Ti take on closely symbiosis and distribute more evenly in titanic magnetite. The Ti exists in the Magnetite lattice in form of isomorphism. The theoretical highest grade of Fe and Ti in the separated Magnetic concentrate are 66.02per cent and 4.86 per cent respectively. In addition, the beach placer contains a small quantity of Ilmenite which is hysterogenic and exists in the form of fine solid solution separation structure in the titanic magnetite

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Montiel, Adriana, Edgar Onofre Bustamante, and María Lorenza Escudero. "Synthesis and Electrochemical Characterisation of Magnetite Coatings on Ti6Al4V-ELI." Metals 10, no. 12 (December 5, 2020): 1640. http://dx.doi.org/10.3390/met10121640.

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Titanium alloys have been widely employed in implant materials owing to their biocompatibility. The primary limitation of these materials is their poor performance in applications involving surfaces in mutual contact and under load or relative motion because of their low wear resistance. The aim of this work is to synthesis magnetite coatings on the Ti6Al4V-ELI alloy surface to increase corrosion resistance and to evaluate its electrochemical behaviour. The coatings were obtained using potentiostatic pulse-assisted coprecipitation (PP-CP) on a Ti6Al4V-ELI substrate. The preliminary X-Ray Diffraction (XRD) results indicate the presence of the magnetite coating with 8–10 nm crystal sizes, determined for the (311) plane. Using X-ray photoelectron spectroscopy (XPS), the presence of the magnetite phase on the titanium alloy was observed. Magnetite coating was homogeneous over the full surface and increased the roughness with respect to the substrate. For the corrosion potential behaviour, the Ti6Al4V-ELI showed a modified Ecorr that was less active from the presence of the magnetite coating, and the impedance values were higher than the reference samples without coating. From the polarization curves, the current density of the sample with magnetite was smaller than of bare titanium.

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Dmitriev, A. N., G. Yu Vit’kina, R. V. Petukhov, S. A. Petrova, and Yu A. Chesnokov. "Estimation of indices of BF heat of titanium-magnetite concentrates with different titanium dioxide content." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 2 (March 10, 2019): 154–65. http://dx.doi.org/10.32339/0135-5910-2019-2-154-165.

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Russia owns world largest reserves of titanium- magnetite and ilmenite- titanium- magnetite ores. Following the stepby-step inclusion into metallurgical processing of titanium- magnetite raw materials, the matter of maximum extraction of iron, vanadium and titanium becomes more and more actual. Kachkanar group of deposits of titanium- magnetite ores consists of two deposits: Gusevgoskoe and Sobstvenno-Kachkanar. At present JSC EVRAZ NTMK uses titanium- magnetite sinter and pellets, produced of Gusevgorskoe deposit ores. To make up the dropped out capacities and to keep the volume of mined ore at the level of 55 m t/year, it is planned to put into operation the reserved Sobstvenno-Kachkanar deposit. To process the titanium- magnetite ores of this deposit, their specific peculiarities should be taken into consideration. In particular, the increased TiO2content in iron ore concentrate up to 3.4% might require corrections of the BF technology. In this connection a study of metallurgical properties of lump iron ore raw materials with different titanium dioxide content was carried out. To clarify the pellets phase components a method of X-ray-phase analysis was used. The studies were done at CKP “Ural-M” equipment in the Institute of Metallurgy, Ural branch of Russian academy of Sciences. It was determined that pellets chemistry was represented by hematite (from 77 up to 89%), magnetite (from 2.84 up to 10.44%), complicated diopside (from 2 up to 10%), as well as in a small amount by quartz, hedenbergite, corundum, rutile, ferro-periclase, ilmenite, wollastonite, α-Fe, wustite. Results of viscosity calculation of obtained slags showed that it is within a range, typical for real BF slags viscosity. The obtained values of slag viscosity do not offer problems with slag regime of BF heat. It was shown, that increase of titanium dioxide content in pellets does not give rise to quality deterioration of iron ore raw materials preparation to BF heat as volume of introduced concentrate with increase TiO2content into the materials is increasing. Increase of hot strength and pellets temperature of beginning of softening, the pellets having increased titanium dioxide content, will positively affect main technical and economic indices of BF heat – coke rate and productivity, that was confirmed by BF indices calculation by application of balance logical and statistical model of BF process.

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Degodya, E. Yu, and O. P. Shavakuleva. "Elaboration of a technology for production conditional ilmenite concentrate by enrichment of titanium-magnetite ores." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 5 (June 20, 2019): 572–76. http://dx.doi.org/10.32339/0135-5910-2019-5-572-576.

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The titanium-magnetite ores keep an important place among complex iron-containing ores. Utilization of these ores, comprising ores of Kopanskoe deposit, in steel industry is a serious problem, requiring for its solving enrichment resulting in obtaining iron-vanadium and ilmenite concentrates. A principal flow-chart of titanium-magnetite ores enrichment with obtaining conditional iron-vanadium and ilmenite concentrates elaborated. Results of flotation tests of non-magnetic fraction of Kopanskoe deposit titanium-magnetite ores, which is difficult for concentration. Application of flotation process for Kopanskoe deposit titaniummagnetite ores enrichment, which is difficult for concentration, enables not only to improve the enrichment indices, but considerably simplify the process chain of the plant equipment by excluding a big number of gravitational facilities. It was shown, that ilmenite and rutile flotation is successfully carried out in an acidic environment with the use of oleic acid, kerosene, sodium fluoride, sulfuric acid, foam activator VKP. The elaborated reagent complex provides obtaining conditional ilmenite concentrate. As a result of enrichment by application the elaborated magnetic flotation technology, iron-vanadium concentrate with a mass fraction of iron equal to 63.4 % and titanium dioxide – 4.5 % as well as ilmenite concentrate with a mass fraction of titanium dioxide equal to 45.2% obtained. The elaborated technology can be used for titanium-magnetite ores of Medvedevskoe, Kusinskoe, Chernorechenskoe deposits.

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Xing, Xiangdong, Yueli Du, Jianlu Zheng, Yunfei Chen, Shan Ren, and Jiantao Ju. "Experimental Study on Strengthening Carbothermic Reduction of Vanadium-Titanium-Magnetite by Adding CaF2." Minerals 10, no. 3 (February 28, 2020): 219. http://dx.doi.org/10.3390/min10030219.

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The effects and reduction mechanisms of carbothermic reduction of vanadium–titanium–magnetite were studied by adding various mass fractions of CaF2 ranging from 0%, 1%, 3%, 5% to 7%. The results showed that the proper CaF2 addition could strengthen the carbothermic reduction of vanadium–titanium–magnetite while the excessive amounts will weaken the promotive effect, hence the appropriate dosage was determined to be 3 mass%. The CaF2 was favorable for the carbon gasification reaction, where it increased the partial pressure of CO inside briquette and caused the lattice distortion of vanadium–titanium–magnetite. The reaction improved the reduction process and accelerated the reduction rate. The appearance of 3CaO·2SiO2·CaF2 and other complex compounds with low melting point facilitated the aggregation and growth of the slag and the iron, which increased the concentration of iron grains and the aggregation level of the slag.

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20

Steinthorsson, S., Ö. Helgason, M. B. Madsen, C. Bender Koch, M. D. Bentzon, and S. Mørup. "Maghemite in Icelandic basalts." Mineralogical Magazine 56, no. 383 (June 1992): 185–99. http://dx.doi.org/10.1180/minmag.1992.056.383.05.

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AbstractCurie temperatures indicating non-titaniferous magnetite are common in Icelandic basalts of all ages, especially Tertiary ones. Yet, microprobe analyses of such samples have shown high titanium in the magnetite. To resolve this paradox, and the mechanism at work, the magnetic mineral fraction of eight basalt samples with Js-T curves characteristic for pure magnetite was subjected to a multi-disciplinary analysis including Mössbauer spectroscopy and X-ray diffraction. In most of the samples titanium in the magnetite, as analysed with the microprobe, ranged between 16 and 28 wt.%, indicating submicroscopic solvus exsolution in the titanomagnetite, beyond the power of resolution for the microprobe. More unexpectedly in view of the reversible Js-T curves, Mössbauer spectroscopy showed appreciable proportion of maghemite in the magnetic fraction. A three-stage mechanism is proposed for the formation of the mineral assemblages observed: (1) limited high-temperature oxyexsolution; (2) solvus exsolution during low-temperature hydrothermal alteration; and (3) maghemitization of the magnetite. Finally, the maghemite may transform to hematite with time. It is concluded that maghemite is much more common in Icelandic rocks than hitherto believed.

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21

Ponomar, Vitalii Pavlovych, and Liubomyr Igorovych Gavryliv. "Mineral magnetic properties of granodiorite, metagabbro and microgabbro of Petermann Island, West Antarctica." Czech Polar Reports 8, no. 1 (January 1, 2018): 94–106. http://dx.doi.org/10.5817/cpr2018-1-7.

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The research focuses on studying the magnetic properties and mineralogy of iron-bearing minerals of granodiorite, metagabbro, and microgabbro of Petermann Island, West Antarctica. The predominant iron-bearing minerals of the rocks are ilmenite, magnetite, and iron sulphides. Magnetite in metagabbro and microgabbro is pointed out to be present as two morphological types with different grain size and morphology. The rocks owe their magnetic properties to the presence of different amounts of magnetite with the Curie temperatures of 570–575°C for granodiorite, 555–560°C for metagabbro and 560–565°C for microgabbro. Magnetite in the rocks is stable under heating to 650°C. A slight decrease in magnetisation at 350–400°C is attributed to the conversion of maghemite or maghemite-like phase into hematite. Variation of the magnetite content within each sample has a strong expression in the saturation magnetisation. The latter increases in sequence: granodiorite (0.8–1.3 Am2/kg), microgabbro (1.8–3 Am2/kg) and metagabbro (3.1–3.5 Am2/kg). The saturation magnetisation of rocks increases with the increasing content of iron. However, the inverse relation is observed for metagabbro and microgabbro due to the replacement of titanite for magnetite in the latter. The magnetic fraction of microgabbro reveals the wasp-waisted hysteresis loop suggesting bimodal size distribution. According to X-Ray Diffraction, the characteristic peaks (d-spacing) of pure magnetite are identified for magnetic fraction of granodiorite and metagabbro, while magnetite of microgabbro form stable intergrowth with titanite and chlorite.

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22

Luo, Jin Hua, Ke Hui Qiu, Yu Chong Qiu, and Pei Cong Zhang. "Studies of Mineralogical Characteristics on Vanadium Titanium Magnetite in Hongge Area, Panzhihua, Sichuan, China." Advanced Materials Research 813 (September 2013): 292–97. http://dx.doi.org/10.4028/www.scientific.net/amr.813.292.

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The composition, the texture and structure, the mineralogical characteristics of major minerals, the main occurrences of major elements and the distribution rules of vanadium titanium magnetite of Hongge area, Panzhihua, Sichuan Province of China, were studied in details by the methods of chemical multi-elements analysis, optical microscope, scanning electron microscope (SEM), electron probe micro-analysis (EPMA), X-ray diffraction (XRD) and X-ray fluorescence (XRF). The study results provide references to the vanadium titanium magnetite beneficiation process of this mining area.

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23

Shaw, Sachin, Manoj Kumar Nayak, and Oluwole Daniel Makinde. "Transient Rotational Flow of Radiative Nanofluids over an Impermeable Riga Plate with Variable Properties." Defect and Diffusion Forum 387 (September 2018): 640–52. http://dx.doi.org/10.4028/www.scientific.net/ddf.387.640.

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The present investigation imparts an analysis on the effect of time-varying rotation and thermal radiation on diversified nanofluids possessing water as base fluid and Magnetite , Cupper Oxide (CuO), and Titania (TiO) as nanoparticles. Variable fluid properties such as variable viscosity and variable thermal conductivity are taken into consideration. Ensuring implementation, Successive Relaxation method is the instrumental in obtaining the most appropriate numerical solution of the transformed differential equations. One of the marvel outcomes of the current study is that moderate rotation reduces the axial and transverse wall shear stresses and augments the heat transfer rate while higher rotation exhibits the reverse trend for Water-Magnetite, Water-Cupper Oxide, Water-Titania nanofluids.

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24

Stergiou, Christos L., Vasilios Melfos, Panagiotis Voudouris, Lambrini Papadopoulou, Paul G. Spry, Irena Peytcheva, Dimitrina Dimitrova, Elitsa Stefanova, and Katerina Giouri. "Rare and Critical Metals in Pyrite, Chalcopyrite, Magnetite, and Titanite from the Vathi Porphyry Cu-Au±Mo Deposit, Northern Greece." Minerals 11, no. 6 (June 14, 2021): 630. http://dx.doi.org/10.3390/min11060630.

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The Vathi porphyry Cu-Au±Mo deposit is located in the Kilkis ore district, northern Greece. Hydrothermally altered and mineralized samples of latite and quartz monzonite are enriched with numerous rare and critical metals. The present study focuses on the bulk geochemistry and the mineral chemistry of pyrite, chalcopyrite, magnetite, and titanite. Pyrite and chalcopyrite are the most abundant ore minerals at Vathi and are related to potassic, propylitic, and sericitic hydrothermal alterations (A- and D-veins), as well as to the late-stage epithermal overprint (E-veins). Magnetite and titanite are found mainly in M-type veins and as disseminations in the potassic-calcic alteration of quartz monzonite. Disseminated magnetite is also present in the potassic alteration in latite, which is overprinted by sericitic alteration. Scanning electron microscopy and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses of pyrite and chalcopyrite reveal the presence of pyrrhotite, galena, and Bi-telluride inclusions in pyrite and enrichments of Ag, Co, Sb, Se, and Ti. Chalcopyrite hosts bornite, sphalerite, galena, and Bi-sulfosalt inclusions and is enriched with Ag, In, and Ti. Inclusions of wittichenite, tetradymite, and cuprobismutite reflect enrichments of Te and Bi in the mineralizing fluids. Native gold is related to A- and D-type veins and is found as nano-inclusions in pyrite. Titanite inclusions characterize magnetite, whereas titanite is a major host of Ce, Gd, La, Nd, Sm, Th, and W.

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25

Pelevin, Aleksei, Vil Saitov, and Vladimir Dmitriev. "Separation of magnetite concentrate before the last grinding stage." E3S Web of Conferences 177 (2020): 01002. http://dx.doi.org/10.1051/e3sconf/202017701002.

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For magnetite and titanium magnetite ores, it is possible to use technology with the separation of concentrate before the last grinding stage. The possibility of staged separation of iron concentrate is due to different physical-mechanical properties of magnetite and rock minerals. The results of industrial and laboratory tests on the use of special magnetic separators with special structure, Derrick screen and screw separators in iron ore dressing schemes are presented. A comparison of proven dressing methods is performed. The choice of a specific dressing method for the staged separation of magnetite concentrate before the last grinding stage is determined by the properties of the base ore and the economic justification.

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26

Liu, Gong Guo. "Study on Utilization Technology of Vanadium Titanium Magnetite Based on the Rotary Hearth Furnace Direct Reduction Process." Applied Mechanics and Materials 217-219 (November 2012): 441–44. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.441.

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Through carrying out large scale of experiments, the process of ‘rotary harth furnace direct reduction—deep reduction electric arc furnace—extracting vanadium from vanadium bearing slag—extracting titanium from titanium bearing slag gets through and the recovery of Fe, V and Ti reached 90.77%, 43.82% and 72.65% respectively. With the study on the laboratory experiments and industrial tests, the bottlenecks of this technology such as low metallization rate of vanadium-titanium magnetite in direct reduction process, low reduction rate of vanadium in EAF, vanadium-recovery of hot metal with high silicon content, titanium-recovery of high –Mg &Al slag with titanium, and so on, have been solved. Based on this, the metallization rate of vanadium-titanium magnetite in direct reduction process is more than 90%, reduction rate of vanadium in EAF deep reduction process is more than 80%, vanadium-recovery rate in slag is more than 65%, and titanium-recovery rate in slag is more than 75%. That means good study results have been gotten. Furthermore, low-carbon pig iron with good quality in EAF steelmaking are gotten. Otherwise, V2O5 sheet and titanium products can meet the requirements of GB3283-87 and PTA121, respectively.

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27

Makhotkina, E. S., and M. V. Shubina. "Results of experiments on vanadium extraction out of Kusinsky deposit titanium-magnetite ores enrichment wastes." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 75, no. 5 (June 20, 2019): 617–22. http://dx.doi.org/10.32339/0135-5910-2019-5-617-622.

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The actuality of exhausted of titanium-magnetite ore deposits wastes is stipulated not only by necessity of their negative impact on environmental elimination, but also by a possibility of application of these wastes as vanadium-containing raw materials. Analysis of existing technological processes for vanadium extraction accomplished. A possibility of vanadium extraction out of Kusinsky deposit titanium-magnetite ore tails studied. Results of experiments on vanadium extraction as soluble vanadates by leaching from the samples after roasting with soda ash, sodium sulfate, calcium oxide, and sodium chloride in various mass ratios presented. It was determined, that additives of sodium chloride and sodium carbonate are the most effective reagents for roasting of this type of vanadium raw materials. A significant effect of titanium-magnetite ore tails chemical composition on the vanadium extraction degree revealed: with an increase content from 0.15% to 0.53% in the ore tails vanadium, the extraction degree increases to 74.8%. When using the sodium chloride reaction additive, it is possible to leach in only one stage using sulfuric acid. Increasing the sodium chloride amount in the roasting mixture leads to a significant increase in the vanadium extraction degree in the leaching solution.

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28

Xiangdong, Xing, Wang Sha, Pang Zhuogang, and Zhang Qiuli. "Effect of B2O3 on the carbothermal reduction of vanadium titanium magnetite." Metallurgical Research & Technology 116, no. 6 (2019): 630. http://dx.doi.org/10.1051/metal/2019053.

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The effect of B2O3 on the carbothermal reduction of vanadium titanium magnetite was investigated under different temperatures by isothermal experiments. XRD analysis, SEM analysis and kinetic analysis were used to reveal the mechanism of B2O3 in the reduction process. The results showed that B2O3 could accelerate the reduction rate of vanadium titanium magnetite, and the suitable addition amount was 3%. B2O3 was easy to melt during carbothermal reduction, B3+ diffused into the crystal lattice of ferrotitanium compound, resulting in a decrease in binding energy and an increase in lattice parameters. B2O3 had also an erosion effect on the surface of the iron ore, and the contact area between reducing agent CO and vanadium titanium magnetite increased, thereby promoting the reduction. Low melting point compound CaO ∙ B2O3 formed after adding B2O3, which could improve the fluidity of the system and change the melting point of non-ferrous phase to further promote the growth and aggregation of iron particles. The reduction process was firstly limited by the first-order chemical reaction, then it was controlled by three-dimensional diffusion of reactants. The activation energy calculated by the best model was smaller than that of without adding B2O3.

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29

Li, Yandong, Shuangyin Chen, and Huamei Duan. "A New Process of Extracting Titanium from Vanadium–Titanium Magnetite." Crystals 11, no. 4 (March 25, 2021): 327. http://dx.doi.org/10.3390/cryst11040327.

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A new process of extracting titanium from vanadium–titanium magnetite (VTM) in the Panxi area in Sichuan, China is introduced in this work. Various experiments, including reduction–magnetic separation, leaching and hydrolyzing experiments, are carried out. The results show that the optimum conditions for leaching experiments are an acid/slag ratio of 4:1, a leaching temperature of 60 °C, a leaching time of 80 min, and a liquid/solid ratio of 3.2:1. The leaching rate of titanium in Ti-bearing slag is 92.41%. The optimum conditions for hydrolyzing experiments are an H+ concentration of 0.75 g·L−1, hydrolyzing temperature of 100 °C, and hydrolyzing time of 180 min, and the hydrolyzing rate of titanium in acid leaching liquor is 96.80%. After the leaching and hydrolyzing experiments, the recovery rate of titanium from the Ti-bearing slag is 89.45%.

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30

Mavrogonatos, Constantinos, Panagiotis Voudouris, Jasper Berndt, Stephan Klemme, Federica Zaccarini, Paul G. Spry, Vasilios Melfos, et al. "Trace Elements in Magnetite from the Pagoni Rachi Porphyry Prospect, NE Greece: Implications for Ore Genesis and Exploration." Minerals 9, no. 12 (November 24, 2019): 725. http://dx.doi.org/10.3390/min9120725.

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Magnetite is a common accessory phase in various types of ore deposits. Its trace element content has proven to have critical implications regarding petrogenesis and as guides in the exploration for ore deposits in general. In this study we use LA-ICP-MS (laser ablation-inductively coupled plasma-mass spectrometry) analyses of trace elements to chemically characterize magnetite from the Pagoni Rachi Cu–Mo–Re–Au porphyry-style prospect, Thrace, northern Greece. Igneous magnetite mostly occurs as euhedral grains, which are commonly replaced by hematite in fresh to propylitic-altered granodiorite porphyry, whereas, hydrothermal magnetite forms narrow veinlets or is disseminated in sodic/potassic-calcic altered (albite + K-feldspar + actinolite + biotite + chlorite) granodiorite porphyry. Magnetite is commonly associated with chalcopyrite and pyrite and locally exhibits martitization. Laser ablation ICP-MS analyses of hydrothermal magnetite yielded elevated concentrations in several trace elements (e.g., V, Pb, W, Mo, Ta, Zn, Cu, and Nb) whereas Ti, Cr, Ni, and Sn display higher concentration in its magmatic counterpart. A noteworthy enrichment in Mo, Pb, and Zn is an unusual feature of hydrothermal magnetite from Pagoni Rachi. High Si, Al, and Ca values in a few analyses of hydrothermal magnetite imply the presence of submicroscopic or nano-inclusions (e.g., chlorite, and titanite). The trace element patterns of the hydrothermal magnetite and especially the decrease in its Ti content reflect an evolution from the magmatic towards the hydrothermal conditions under decreasing temperatures, which is consistent with findings from analogous porphyry-style deposits elsewhere.

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31

Xu, Jingjing, Yanhui Ao, Degang Fu, and Chunwei Yuan. "Low-temperature preparation of anatase titania-coated magnetite." Journal of Physics and Chemistry of Solids 69, no. 8 (August 2008): 1980–84. http://dx.doi.org/10.1016/j.jpcs.2008.02.015.

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32

Beydoun, Donia, Rose Amal, Gary K. C. Low, and Stephen McEvoy. "Novel Photocatalyst: Titania-Coated Magnetite. Activity and Photodissolution." Journal of Physical Chemistry B 104, no. 18 (May 2000): 4387–96. http://dx.doi.org/10.1021/jp992088c.

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33

Pang, Suh Cem, Sze Yun Kho, and Suk Fun Chin. "Fabrication of Magnetite/Silica/Titania Core-Shell Nanoparticles." Journal of Nanomaterials 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/427310.

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Fe3O4/SiO2/TiO2core-shell nanoparticles were synthesized via a sol-gel method with the aid of sonication. Fe3O4nanoparticles were being encapsulated within discrete silica nanospheres, and a layer of TiO2shell was then coated directly onto each silica nanosphere. As-synthesized Fe3O4/SiO2/TiO2core-shell nanoparticles showed enhanced photocatalytic properties as evidenced by the enhanced photodegradation of methylene blue under UV light irradiation.

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34

Chen, Shuang-yin, Xiao-jiao Fu, Man-sheng Chu, Xi-zhe Li, Zheng-gen Liu, and Jue Tang. "Carbothermic reduction mechanism of vanadium-titanium magnetite." Journal of Iron and Steel Research International 23, no. 5 (May 2016): 409–14. http://dx.doi.org/10.1016/s1006-706x(16)30065-6.

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35

Bendimya, K., C. de Francisco, P. Hernandez, O. Alejos, and J. M. Muñoz. "The Magnetic Disaccommodation in Titanium Doped Magnetite." Le Journal de Physique IV 07, no. C1 (March 1997): C1–605—C1–606. http://dx.doi.org/10.1051/jp4:19971250.

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36

Starkey, Les. "TITANIUM-MAGNETITE: Geophysical signature of the Balla Balla titaniferous magnetite deposit, Western Australia." ASEG Extended Abstracts 1994, no. 1 (December 1994): 383–90. http://dx.doi.org/10.1071/asegspec07_28.

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37

Yoon, Chang-Min, Yoonsun Jang, Seungae Lee, and Jyongsik Jang. "Dual electric and magnetic responsivity of multilayered magnetite-embedded core/shell silica/titania nanoparticles with outermost silica shell." Journal of Materials Chemistry C 6, no. 38 (2018): 10241–49. http://dx.doi.org/10.1039/c8tc03677b.

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Multilayered magnetite-embedded core/shell silica/titania (SiO₂/TiO₂) nanoparticles with an outermost silica shell (SiO₂/TiO₂@Fe₃O₄/SiO₂) were synthesized and used to develop stimuli-responsive smart fluids.

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38

Dang, Jie, Xiaojun Hu, Guohua Zhang, Xinmei Hou, Xiaobo Yang, and Kuochih Chou. "Kinetics of Reduction of Titano-magnetite Powder by H2." High Temperature Materials and Processes 32, no. 3 (June 14, 2013): 229–36. http://dx.doi.org/10.1515/htmp-2012-0128.

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AbstractReduction of titano-magnetite powder containing 56.9 mass% of iron and 9.01 mass% of TiO2 with H2-Ar gas mixtures was investigated in isothermal experiments using thermo-gravimetric analyzer (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The reduction of titano-magnetite was proved to proceed via a dual reactions mechanism. The first reaction is reduction of titano-magnetite to wüstite and ilmenite and the second one is reduction of wüstite and ilmenite to iron and titanium-containing phase. It was found that the dual reactions occurred simultaneously during the reduction. The reduction kinetics of titano-magnetite was analyzed according to a dual reactions kinetic model and the results indicated that the gaseous species diffusion in product layer was the rate controlling step for the first reaction, and interfacial chemical reaction was that for the second reaction. The apparent activation energies were extracted to be 98 kJ/mol and 115 kJ/mol for the first and second reaction, respectively.

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Kusova, T. V., I. A. Yamanovskaya, N. S. Kopeikina, A. S. Kraev, and A. V. Agafonov. "Obtaining mesoporous materials based on titanium dioxide modified by magnetite with high adsorption capacity and photocatalytic activity." Perspektivnye Materialy 12 (2020): 64–72. http://dx.doi.org/10.30791/1028-978x-2020-12-64-72.

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Crystalline composite structures based on titanium dioxide modified by magnetite particles with improved sorption and photocatalytic properties were obtained by a microwave-assisted method. This method is based on a polyol method synthesis of titanium glycolate using microwave heating and followed by the water treatment under microwave heating at 2.45 GHz, without using the calcination stage at high temperatures. It was found that the treatment of titanium glycolates in water under the influence of microwave heating leads to the formation of the crystal structure of titanium dioxide (polymorphic anatase modification). Using scanning electron microscopy, it was shown that during the synthesis of composite structures based on titanium dioxide, the formation of particles of a spherical and rod-shaped form. The resulting materials were characterized by electron microscopy, X-ray phase analysis, dynamic light scattering, and low-temperature nitrogen adsorption/desorption. The analysis of the influence of structural and morphological features on the adsorption capacity and photocatalytic activity of the composites is carried out. A comparative analysis of the photocatalytic activity of the obtained composites in the decomposition of the Rhodamine B dye under UV radiation showed that the most effective dye removal (~ 99 %) were observed in the presence of both spherical and rod-shaped composite structures as catalysts containing 1 % of magnetite.

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40

Yang, He, Ming Long Ma, Ming Lei Gao, Xiang Xin Xue, and You Quan Tang. "Research on Heat Treatment Process of Foam Glass Prepared by Titania-Bearing Blast Furnace Slag." Advanced Materials Research 79-82 (August 2009): 1587–90. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1587.

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Foam glass insulation materials were made by using titania-bearing blast furnace slag. Heat treatment process including foaming temperature, foaming time and heating rate were studied and their parameters were determined. First of all, heat treatment process parameter was determined by single factor experiment. Second, optimum process parameters of heat treatment process were obtained by the optimization of orthogonalization procedure. The results showed that foaming temperature has a remarkable effect on sample pore structure ；Foaming time has a less effect on pore distribution but its effect on the diameter of the pore is obvious; Heating rate has a less effect on the diameter of the pore. The magtitude of impact of heat treatment on glass properties arrange in an order of foaming temperature, foaming time and heating rate. The Optimal parameters of heat treatment are that heating rate ,foaming temperature and foaming time are 12°C/min，900°C, 15min respectively ; After preheating, sintering, foaming and foam stability and annealing heat treatment process, an amorphous foam glass with uniform pore size was obtained. Its thermal conductivity coefficient, the bulk density, compressive strength and average diameter are 0.131w / m ∙ k, 445.8 kg/m3, 2.8MPa, 4.78mm respectively. This kind of material can be widely used in building, chemical and shipbuilding industry as thermal insulation, sound absorption, corrosion-resistant and floating materials. Titania-bearing blast furnace slag is solid waste generated from vanadium-titanium magnetite by the blast furnace smelting, which is accumulated without being utilized. At present, Titania-bearing blast furnace slag is mainly used for cement concrete admixture, preparation of photocatalytic materials, extraction of titanium dioxide etc [1-2].Foam glass has been playing a more important role in low-temperature thermal insulation and moisture-proof anticorrosive projects field, and getting more economic benefits in energy saving and technology field. At present, the stuff for preparing foam glass is solid waste including waste glass, fly ash, slag, or natural minerals such as ash, mica, perlite etc. Foaming agent is usually selected from Carbon and carbonate [3-6]. In this paper, foam glass insulation materials were made by using titania-bearing blast furnace slag-based stuff. The effect of heat treatment process on foam glass performance was studied in a bid to find a new way to utilize titania-bearing blast furnace.

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Ao, Yanhui, Jingjing Xu, Degang Fu, Long Ba, and Chunwei Yuan. "Deposition of anatase titania onto carbon encapsulated magnetite nanoparticles." Nanotechnology 19, no. 40 (August 21, 2008): 405604. http://dx.doi.org/10.1088/0957-4484/19/40/405604.

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Sun, Weiwei, Yu Xie, and Paul R. C. Kent. "Double transition metal MXenes with wide band gaps and novel magnetic properties." Nanoscale 10, no. 25 (2018): 11962–68. http://dx.doi.org/10.1039/c8nr00513c.

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43

Zhang, Rui, Zhao Hui Zhang, and Ni Li. "Study on Comprehensive Recycling of an Ilmenite Ore Beneficiation Test." Advanced Materials Research 785-786 (September 2013): 1060–65. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.1060.

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Ilmenite phase is complex in Shaanxi.There are mainly magnetite, limonite and ilmenite, and associated with extremely small amount of rutile. According to the occurrence iron and titanium in the ilmenite ore。Paper discussed comprehensive recycling of the ilmenite using wet low-intensity magnetic separation by stage grinding process . The results show that it obtains better mineral processing indexes。The productivity of ilmenite concentrate was 28.83%, the grade of iron in concentrate was 62.05%, the content of titanium was 13.11%, iron recovery was 61.73%, titanium recovery was 43.40%.

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44

Coenraads, Robert R., Pongsak Vichit, and F. Lin Sutherland. "An unusual sapphire–zircon–magnetite xenolith from the Chanthaburi Gem Province, Thailand." Mineralogical Magazine 59, no. 396 (September 1995): 465–79. http://dx.doi.org/10.1180/minmag.1995.059.396.08.

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AbstractA sapphire, zircon and magnetite-bearing xenolith from Khao Wua, near Chanthaburi in Thailand, conclusively demonstrates a common origin for the sapphire, zircon and magnetite found in alluvial deposits in the Chanthaburi gem fields. The original aluminium- and titanium-rich octahedral magnetite crystal in the xenolith exsolved into hercynite, magnetite and hematite during cooling. It includes minor anhedral jarosite–alunite, possibly originating as an iron-sulphide-rich immiscible liquid. Uranium-lead isotope dating of zircon in the xenolith gives an age of 1–2 (± <1) million years (Ma). This falls within fission track ages for alluvial zircons (2.57 ± 0.20 Ma) from the Chanthaburi—Trat gem fields and within the potassium-argon ages of 0.44 to 3.0 Ma for the alkali basaltic volcanism in the Chanthaburi Province. These data suggest a common origin for sapphire, zircon and magnetite, and link them with the processes involved in alkali basaltic magma generation. The high iron and zirconium, low magnesium, and the inferred sulphides suggest pegmatite-like crystallization in an incompatible-element enriched, silica-poor magma (partial melt or fractionation product) in the deep crust or upper mantle. Etch features on exposed surfaces of the xenolith indicate that it was transported out of its equilibrium environment by the rise of later magma.

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Agullo, J., C. Bataillon, and M. Roy. "Electrochemical dissolution of magnetite electroplated coatings on titanium." Electrochimica Acta 260 (January 2018): 890–97. http://dx.doi.org/10.1016/j.electacta.2017.12.063.

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Islamov, B. F., A. I. Rustamov, V. D. Tsoi, and S. S. Sayitov. "Promising scandium content of Tebinbulak titanium-magnetite deposit." Vestnik of Geosciences 3 (2021): 21–26. http://dx.doi.org/10.19110/geov.2021.3.3.

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We present results of geological-mineralogical-geochemical studies of the Tebinbulak scandium-containing titanium-magnetite deposit in Western Uzbekistan. The levels of scandium content in ores and rocks of the pyroxene-hornblende massif have been analyzed. The potential for the associated extraction of scandium from ores, which can significantly increase the profitability of the industrial development of the deposit, is discussed.

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Kapelyushin, Yu, V. Roshchin, and A. Roshchin. "Beneficiation of Vanadium and Titanium Oxides by Using Selective Extraction of Iron in Low-Titanium Magnetite Concentrate." Solid State Phenomena 265 (September 2017): 913–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.913.

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Issues with existing vanadium beneficiation stimulate the development of new technologies for wasteless production of vanadium. The present work investigates a possibility of beneficiation of vanadium and titanium oxides in a low-titanium magnetite concentrate by using selective reduction and extraction of iron. Iron was selectively reduced by coal without melting and separated from the oxide (slag) phase during further smelting operation. After the liquid-phase separation vanadium and titanium oxides were accumulated in a slag phase. The following products were produced: slag, containing vanadium and titanium oxides, and iron with relatively low carbon content. The content of vanadium and titanium in a final product has increased in comparison to the initial concentrate.

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Clark, T., A. Gobeil, and J. David. "Iron oxide - copper - gold-type and related deposits in the Manitou Lake area, eastern Grenville Province, Quebec: variations in setting, composition, and style." Canadian Journal of Earth Sciences 42, no. 10 (October 1, 2005): 1829–47. http://dx.doi.org/10.1139/e05-048.

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The Manitou Lake area (Kwyjibo and Lac Marmont sectors), located in Quebec's eastern Grenville Province, contains magnetite-rich deposits with variable morphological, mineralogical, and chemical characteristics. Most Kwyjibo sector deposits are rich in Cu, rare-earth elements (REE), Y, P, F, and Ag and are anomalous in Th, U, Mo, W, Zr, and Au, and Lac Marmont sector deposits are commonly poor in these elements. Deposits occur in or are closely associated with 11751168 Ma leucogranite. They contain combinations of magnetite, clinopyroxene, bluegreen hornblende, titanite, apatite, fluorite, quartz, biotite, andradite, epidote, albite, hematite, sulfides (chalcopyrite, pyrite, pyrrhotite, molybdenite, sphalerite), ilmenite, allanite, and other REE-bearing minerals. Veins and breccias are common. Most of the magnetite mineralization was preceded by potassic metasomatism (microcline) and was followed by most of the sulfides and radioactive minerals. Nearby sulfide-dominant deposits may be related. The deposits were formed by metasomatic replacement and fracture filling from hydrothermal fluids of variable composition, which were probably channeled in major, active faults. Oxygen-isotope data from magnetite-rich rocks suggest that fluids were predominantly magmatic and (or) metamorphic and that, locally, mixing with cooler meteoric water may have facilitated precipitation of sulfides and rare-metal minerals. Titanites in mineralized rock have been dated at 972 ± 5 Ma, but most magnetite may be older. Mineralization was syn- to post-tectonic and occurred in an orogenic to orogenic-collapse setting. The CuREEY-rich deposits are similar to iron oxide copper gold (IOCG) Olympic Dam type deposits, and copper- and rare-metals-poor occurrences resemble magnetite ± apatite Kiruna-type deposits.

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Damman, Arend H. "Mn-silicate skarns from the Gåsborn area, West Bergslagen, central Sweden." Mineralogical Magazine 53, no. 373 (December 1989): 613–24. http://dx.doi.org/10.1180/minmag.1989.053.373.12.

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AbstractIn the Gåsborn area, West Bergslagen, central Sweden, Mn-silicate-magnetite-jacobsite skarns were formed as the result of three successive processes. (1) Deposition of exhalative-sedimentary manganiferous iron-ore-bearing sediments together with cherts and volcanics. (2) Intrusion of a synvolcanic anorogenic granite and some slightly younger gabbros and tonalites: under influence of these intrusives the manganiferous iron-ore-bearing sediments were metamorphosed into (a) rhodonite(I)-magnetite-pyrophanite-garnet assemblages; (b) (manganiferous) hedenbergite(I)-allanite-titanite-garnet-magnetite assemblages; (c) tephroite-jacobsite-pyrophanite-garnet assemblages and (d) magnetite-bearing quartzites. (3) Release of hydrothermal fluids from the granite and subsequent alteration of the above assemblages into metasomatic infiltration skarns, consisting of rhodonite(II), garnet, hedenbergite(II), biotite, actinolite or edenite (with up to 20.11 wt.% MnO), chlorite, bementite, fluorite, helvite, rhodochrosite, hematite, rutile and accessory galena, sphalerite, wittichenite, aikinite, pyrrhotite, chalcopyrite and pyrite.The maximum temperature (T) and pressure (P) during contact metamorphism are estimated at 550°C and 1.0 kbar respectively. The fluid under influence of which the metasomatic infiltration skarns were formed was relatively rich in Fe, Cl and F and carried little or no Mg and Mn.During early diagenesis (beginning of stage 2) fo2 was between the hematite/magnetite (hm/mt) and the hausmannite + hematite = jacobsite buffers (h + m = j). During stage 2, with increasing T, fo2 changed from above to below hm/mt. Magnetite and jacobsite at some distance from the hydrothermal veins from which the metasomatic skarn-forming fluids were released, were altered during stage 3 into hematite. Magnetite in, and close to the hydrothermal veins was not altered to hematite, implying an increase in fo2 to above hm/mt with increasing distance from these veins.

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Liu, Shu Xian, Jun Cong Wei, Shao Bo Wei, and Yi Miao Nie. "The Vanadium Titanium Magnetite Tailings of Chengde Area Comprehensive Recycling Situation and Development Trend." Advanced Materials Research 753-755 (August 2013): 28–31. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.28.

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Summarized the siutuation of the vanadium titanium magnetite tailings recycling in Chengde, TiO2 in ilmenite tailings grade almost more than 2%, caused by TiO2 resources waste, put forward by gravity separation, magnetic separation,and flotation combined process method for titanium iron ore tailings reelection, and put forward the technological process selection by reducing the grinding fineness, increasing number of handpick and scavenging, adopt combination process and increasing flotation process to increase the recovery rate of TiO2, reduce TiO2 grade in the tailings.

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Journal articles on the topic 'Titanian magnetite'

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