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Journal articles on the topic 'Magnesian'

Author: Grafiati

Published: 13 April 2024

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1

Smirnov, Andrei N., Igor A. Grishin, and Aleksei V. Masalimov. "Characterizing magnesite heavy-media separation screenings as promising technogenic raw materials." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal 1 (March 30, 2021): 88–93. http://dx.doi.org/10.21440/0536-1028-2021-2-88-93.

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Introduction. This article discusses the possibility of using technogenic raw materials for the production of magnesia and magnesium oxide. The analysis of domestic industry supply with magnesite and magnesian raw materials is presented. Man-made minerals, such as magnesite screenings, produced in the course of heavy-media separation of ore, are noted to be a promising source of this type of raw material. It has been established that this type of raw material is poorly studied. Research methodology. The applied research methods were substantiated to establish the amount and form of magnesium oxide in the magnesite screenings of the Satka deposit. Results and discussion. A significant amount of both current and accumulated screenings at the site in Satka and their chemical composition allow us to consider them as a promising technogenic raw material for magnesium oxide production. The work has determined the distribution of magnesium oxide by size classes. On the basis of elemental analysis, it was decided to recognize the object under study as a suitable mineral for processing. The thermogravimetric analysis of magnesite screenings made it possible to establish the forms of magnesium oxide in the material. Conclusions. Analysis of the results obtained allows us to assert the possibility of processing the studied technogenic raw materials, but the presence of magnesium oxide in the composition of solid solutions with calcium carbonate predetermines the use of chemical enrichment methods.

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Shapovalov, A. N., E. V. Ovchinnikova, and V. B. Gorbunov. "Use of magnesian fluxes of the Khalilovo deposit in sinter production." Izvestiya. Ferrous Metallurgy 62, no. 7 (August 22, 2019): 548–56. http://dx.doi.org/10.17073/0368-0797-2019-7-548-556.

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The article describes the magnesian fluxes properties of the Khalilovo deposit with different proportions of magnesite and serpentine. The results of laboratory experiments on the effect of these fluxes with various magnesite contents on the parameters of sintering process of the Kursk magnetic anomaly ores at JSC “Ural Steel” are presented. The use of experimental magnesian fluxes of the Khalilovo deposit increases the sinter strength, yield and sinter productivity. With the use of experimental fluxes instead of Bakal siderite, an increase in the sinter yield of 3 – 5 % (rel.) can be reached. In addition, the sinter productivity increases from 1.04 to 1.08 – 1.15 t/(m2·h), that is, by 4 – 10 % (rel.). The use of experimental magnesian fluxes increases the sinter strength: the tumbler index (+5 mm) increases by an average of 4 – 6 % (abs.), and the abrasion index (–0.5 mm) decreases by 0.6 – 0.8 % (abs.). Improving the strength characteristics of the sinter using magnesian fluxes of the Khalilovo deposit is due to the formation of “reinforcing” ferritic binder, as well as due to homogenization of the solidifying melt and its crystallization in the form of glass phase of the rankinite composition, which together limit the formation of β-Ca2SiO4 . The results of experimental sintering have confirmed the possibility of using experimental fluxes in the sintering production at sinter plant of JSC “Ural Steel” without changing the production technology. The rational variant for JSC “Ural Steel” is 50 % of magnesite of Khalilovo deposit in sinter rawmix. Replacement of the Bakal siderite in the production of sinter with 2 % of MgO on the magnesian flux of the Khalilovo deposit with 50 % of magnesite provides an increase in yield by 4 – 5 %, an increase in sinter strength by 5 – 6 % and an increase in sinter productivity by 8 – 10 % while keeping the iron content at the level of the “base” period.

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3

Buckley, H. A., and A. R. Woolley. "Carbonates of the magnesite–siderite series from four carbonatite complexes." Mineralogical Magazine 54, no. 376 (September 1990): 413–18. http://dx.doi.org/10.1180/minmag.1990.054.376.06.

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AbstractCarbonates of the magnesite-siderite series have been found and analysed in carbonatites from the Lueshe, Newania, Kangankunde, and Chipman Lake complexes. This series has been represented until now only by a few X-ray identifications of magnesite and three published analyses of siderite and breunnerite (magnesian siderite). Most of the siderite identified in carbonatites in the past has proved to be ankerite, but the new data define the complete solid-solution series from magnesite to siderite. They occur together with dolomite and ankerite and in one rock with calcite. The magnesites, ferroan magnesites and some magnesian siderites may be metasomatic/hydrothermal in origin but magnesian siderite from Chipman Lake appears to have crystallized in the two-phase calcite + siderite field in the subsolidus CaCO3-MgCO3-FeCO3 system. Textural evidence in Newania carbonatites indicates that ferroan magnesite, which co-exists with ankerite, is a primary liquidus phase and it is proposed that the Newania carbonatite evolved directly from a Ca-poor, Mg-rich carbonatitic liquid generated by partial melting of phlogopite-carbonate peridotite in the mantle at pressures >32 kbar.

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4

Gržeta, B., D. Medaković, and S. Popović. "New Method for Estimation of the Magnesium Fraction in Magnesian Calcite." Materials Science Forum 443-444 (January 2004): 55–58. http://dx.doi.org/10.4028/www.scientific.net/msf.443-444.55.

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A new method for estimation of the magnesium fraction in magnesian calcite is described. It involves measuring the XRD pattern of magnesian calcite in a narrow 20 range and individual profile fitting of diffraction lines 113 and 202. The intensity ratio I113/I202 is linearly correlated with the Mg fraction. The method resulted from an XRD study of adult sea urchins Sterechinus neumayeri.

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5

Long, Quanming, Qinglin Zhao, Wei Gong, Yuqiang Liu, and Wangui Gan. "Effect of Magnesian-Expansive Components in Steel Slag on the Volume Stability of Cement-Based Materials." Materials 16, no. 13 (June 28, 2023): 4675. http://dx.doi.org/10.3390/ma16134675.

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Millimeter-scale magnesian refractory granules were found to be a unique magnesian-expansive component in steel slag. To systematically study the effects of these granular magnesian-expansive components on the volume stability of cement-based materials containing steel slag, an investigation of their existing forms and influence on the volume stability was conducted in this paper. The various-sizing waste–magnesium–chromate-based refractory brick (Mg-Cr brick) granules and different (FeO + MnO)/MgO ratios’ synthetic MgO·xFeO·yMnO ternary solid solutions granules were adopted to simulate magnesian-expansive granules by partially replacing manufactured sand in mortar. The 100 °C–3 h boiling and 213 °C–2 MPa–3 h autoclaving treatments were adopted as volume stability testing methods. The results indicated that whether Mg-Cr brick or MgO·xFeO·yMnO solid solution, the concentration of expansive stress and the anisotropy expansion came with the granular size rising weakening the volume stability of cement-based materials which contained magnesian-expansive granules, significantly. Meanwhile, this phenomenon resulted in the ineffectiveness of the single linear expansion rate when assessing the qualification of volume stability. Furthermore, it also changed the mortars’ failure mode from “muddy damage” to “break into blocks”. Especially, there is no volume stability issue when the MgO·xFeO·yMnO satisfied (FeO + MnO)/MgO ≥ 1.00. Considering the significant effect of the granular magnesian-expansive components on the volume stability of cement-based materials containing steel slag, it is imperative to enhance the detection of both MgO content and mineral existing forms in steel slag in practical applications. For recommendation, the threshold value of conducting autoclaved volume stability testing on steel slag should be set at MgO ≥ 3%. Furthermore, the qualification cannot be judged by the single linear expansion rate; the specimens’ appearance integrity and strength loss should also be noted.

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6

Joshua D. Sosin. "Magnesian Inviolability." Transactions of the American Philological Association 139, no. 2 (2009): 369–410. http://dx.doi.org/10.1353/apa.0.0035.

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7

Mitina, Natalia A., Vasiliy A. Lotov, Margarita A. Kovaleva, and Natali O. Kopanitsa. "PEAT-CONTAINING COMPOSITION CONTAINING MAGNESIA BINDER." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, no. 8 (August 21, 2018): 81. http://dx.doi.org/10.6060/ivkkt201861008.5729.

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Based on the new hydraulic magnesia binder, the compositions of the peat-containing composite material have been proposed and investigated. Hydraulic magnesia binder is an astringent composition of hydration-reaction hardening, which consists of an active caustic magnesia powder and a mixing fluid. As the fluid mixing an aqueous solution of magnesium bicarbonate Mg(HCO3)2 with a concentration of 13 g/l was used. Hardening forms water-insoluble products - magnesium hydroxide Mg(OH)2 and magnesium bicarbonates of general formula MgCO3·zMg(OH)2·nH2O, which makes it possible to harden and used products based on such a binder as in the air, and in water. The use of peat as a filler of the developed compositions will make it possible to obtain lightweight waterproof materials and products of heat-insulating purpose. It has been shown that the peat-and-magnesian compositions of all compositions have a hydration hardening coefficient of more than 1.0, which indicates intensification of the hydration and hardening processes in water conditions in comparison with air and large strength parameters. Using XRD the phase composition of peat products and peat- magnesium hardening compositions was established. Thermal analysis showed the presence of magnesium hydrogencarbonates in samples of compositions that are in the form of slightly crystallized neoplasms. Investigations by electron microscopy confirmed the presence of hydrocarbons such as magnesium particles dipingite Mg5(CO3)4(OH)2·5H2O and hydromagnesite Mg5(CO3)4(OH)2·4H2O in the form of thin plates with the vertical direction of crystallization. Increased water resistance of compositions based on hydraulic magnesia binder with non-water-resistant filler peat is due to mineralization of peat particles due to their impregnation with a solution of magnesium bicarbonate and the formation of water-soluble magnesium hydrogen carbonates in the loose porous structure of peat.

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8

Shiraishi, Kazuyuki, Takanobu Oba, Morihisa Suzuki, and Ken’ichi Ishikawa. "Subsilicic magnesian potassium-hastingsite from the Prince Olav Coast, East Antarctica." Mineralogical Magazine 58, no. 393 (December 1994): 621–27. http://dx.doi.org/10.1180/minmag.1994.058.393.11.

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AbstractTwo subsilicic magnesian potassium-hastingsites (4.55 and 4.34 wt.% K2O) and one magnesian potassium-hastingsite occur in calc-silicate pods in well-layered gneisses from the transitional amphibolite- and granulite-facies terrain of a Cambrian metamorphic complex, East Antarctica. Subsilicic magnesian potassium-hastingsite is the most K-rich Ca-amphibole yet reported:

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Benkhamallah, Z., M. Benyahia, and A. Ayache. "Hydrochemical study of groundwater in province of Ain Temouchent (western Algeria)." Journal of Fundamental and Applied Sciences 12, no. 3 (September 1, 2020): 1298–312. http://dx.doi.org/10.4314/jfas.v12i3.19.

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Groundwater resources are very scarce in the Ain Temouchent region due to the geological nature. Their operations are essential to increase the volume of water to meet the needs of the population, socio-economic development; agriculture and urbanization have accentuated the problem of their shortages. The results of the physico-chemical analyses of the various samples taken from the fifteen underground sources; show us that these waters are chlorinated, sulphated, calcic and magnesian in nature; Bicarbonate, calcic and magnesian and sodic and potassic, with high electrical conductivity and significant mineralization, evolve slightly from south to north. A predominance of chlorides, magnesium, a high content of calcium, are influenced in some places by the lithology and mineralogy of the aquifer, but also by precipitation and high evaporation in these areas, in some cases by the overexploitation of aquifers.

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10

Zyryanova, V. N., E. V. Lytkina, and A. P. Ochur-Ool. "Serpentinite Magnesium Binders, Based on Technogenic Raw Materials." Solid State Phenomena 316 (April 2021): 1050–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.316.1050.

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Increasing water resistance and mechanical strength of hardening magnesian binders’ products can be achieved by introducing microfillings into a hardening dispersed system. It is shown that serpentine provides an increase strength and water resistance in hydration and hardening process, being as a structure-forming component, it intensifies this process. It allows expanding the raw material base for the production of magnesia binders for construction purposes.

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11

Owen, J. Victor, Erin Adlakha, and Delaney Carter. "Crawling Glazes on Mid-Century Modern Maritime Canadian Studio Pottery: Shared or Re-Created?" Material Culture Review 96 (January 31, 2024): 63–82. http://dx.doi.org/10.7202/1109047ar.

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<p>This paper presents compositional data for crawling glazes made by prominent studio potters in New Brunswick and Nova Scotia during the mid-20th century (Erica and Kjeld Deichmann, Eleanor and Foster Beveridge, and Carrie Mackenzie) with the objective of (1) identifying key glaze ingredients, and (2) determining whether glaze recipes were shared by these potters, or if the glaze produced by one (likely the Deichmanns) inspired others to re-create it. Crawling glazes are those that retract during firing, creating “islands”. They commonly have unusual compositions (e.g., high alumina contents) to ensure a high viscosity and surface tension, but crawling can also be triggered by treating the ceramic surface to minimize adhesion with the glaze prior to firing. The Deichmanns used different formulae to produce their signature “Snow on the Mountain” (SOTM) crawling glaze used on redware versus stoneware. Three of four of their analysed glazes are magnesian owing to the use of magnesium carbonate (the mineral magnesite); the fourth is highly potassic and calcic (suggesting the use of “pearl ash” and “whiting”) and less aluminous. The Beveridges’ counterpart, though visually-similar, has a distinct composition, and calcium-magnesium carbonate (dolomite) was used instead of magnesite. Crawling was ensured in most samples by high alumina contents. Mackenzie’s glaze is visually distinct (i.e., is brown, not white) and has very high lead and low alumina, lime and magnesia contents. Crawling in it and in the single low-alumina Deichmann glaze is attributed devolatilization of carbonate minerals, thick application and/or pre-glazing surface treatment. The analytical data suggest that the Deichmanns did not share specific details of their SOTM glaze formulae with the Beveridges, who evidently sought to re-create them. Mackenzie formulated a distinct crawling glaze, but also made knobbed wares likely inspired by the Deichmanns’ well-known “Kish” bowls.</p>

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12

Kolokoltsev, V., S. Klochkovskii, and A. Smirnov. "Physical Chemistry of Integrated High-Magnesia Siderites Processing." Defect and Diffusion Forum 353 (May 2014): 171–76. http://dx.doi.org/10.4028/www.scientific.net/ddf.353.171.

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In the article the results of research are considered, that can be the basis for the modernization of the technology used at present time and can be applied for development of the fundamental principles of the complex processing technology of high-magnesian siderite satisfying the modern environmental requirements. Keywords: siderite ores, magnesium oxide, technology, leaching, carbonic acid

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13

Damyanov, Zhelyazko, and Leonid Ratiev. "Mineralogical-genetic types of siderite from Kremikovci deposit." Geologica Balcanica 24, no. 2 (April 30, 1994): 71–82. http://dx.doi.org/10.52321/geolbalc.24.2.71.

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Three polygenic and polychronous siderite mineralizations were established in Kremikovci deposit: syn-diagenetic, hydrothermal and supergenetic, represented by 7 mineralogicalgenetic types of siderite. The syn-diagenetic siderites (I-III types) are micro- to fine-grained, with massive and rare finely-banded and organogenic structures. They are distinguished for relative uniformity and wide variations in grains' composition. They pertain to the magnesian-manganoan (I-II types) and manganoan-magnesian (III type) varieties. During the process of diagenesis the MgC03 content increases. Siderite II is the most widespread type in the deposit. The hydrothermal (veined and metasomatic) siderites form their own sideritic formation (IV type) or attendant the sulphide-barite mineralization (V-VI types). They are coarser-grained, predominantly idiomorphic and with zonal composition. They are represented by magnesian-calcian-manganoan to calcian-magnesian-manganoan (IV type) and magnesian-manganoan to manganoan-magnesian (V-VI types) varieties. The spherulites of siderite VII are distinguished by their maximum values of CaC03 and low quantities of MnCO3 caused by the geochemical separation of Mn and Fe during the supergenetic processes. The XRD studies show that changes in compositions influence the major d1014 reflex being of the following values for the different siderite types: I-III - 2.79 Å; V-VI - 2.80-2.81 Å; IV – 2.81-2.82 Å; VII - over 2.82 Å. The new data presented on the siderite mineralogy support the hypothesis of polygenic and polychronous genesis of the Kremikovci deposit.

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Hartman, Miloslav, Otakar Trnka, and Václav Veselý. "Heats of Decomposition and Equilibrium Dissociation Pressures of the Magnesian and Calcareous Compounds in Desulfurization Technologies." Collection of Czechoslovak Chemical Communications 58, no. 8 (1993): 1885–90. http://dx.doi.org/10.1135/cccc19931885.

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In processes for flue gas cleanup, several magnesian and calcareous compounds occur either as parent sorbent materials or as a reaction products. very simple predictive expressions are proposed for estimating the decomposition heats and dissociation pressures of hydroxide, carbonate, sulfite and sulfate of magnesium and calcium at different temperatures. The developed relationships are based on the thermochemical data and experimental results taken from the literature.

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15

Babenko, A. A., L. A. Smirnov, E. V. Protopopov, and L. Yu Mikhailova. "Smelting of steel semi-product in BOF and EAF under magnesian slags." Izvestiya. Ferrous Metallurgy 63, no. 7 (October 5, 2020): 491–98. http://dx.doi.org/10.17073/0368-0797-2020-7-491-498.

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Basics for the development of a rational composition of the main magnesian slags and technological methods for their formation according to the periods of BOF bath blowing and the periods of smelting in EAF are the results of fundamental studies of the slags physicochemical properties. Implementation in the converter shop of OJSC “EVRAZ NTMK” of a developed set of technological methods of magnesian slags formation in the main period of blowing and a wearresistant skull on the basis of magnesian final slags ensured record durability of converter linings. These slags have low aggressive effect on the lining of converters, while maintaining high refining properties. The durability of the converters’ lining exceeds 7000 heats, while maintaining high technological and technical-economic indicators of the process. During heats of low manganese cast irons in 350-metric ton heavy converters of JSC “EVRAZ ZSMK” under magnesian slags, the features of slag formation and changes in chemical composition of the slag were studied by the periods of the BOF bath blowing. During the process stage of phosphorous cast irons in 300-metric ton BOF at JSC “ArcelorMittal Temirtau”, a set of technological methods was developed for the formation of magnesian slags of the recommended chemical composition by the periods of phosphorus cast irons blowing and wear-resistant skulls based on final magnesian slags of moderate basicity. The implementation of the developed technological methods ensured the lining stability of BOF of more than 5 000 heats while maintaining high technological, technical and economic indicators of phosphorous process stage. In the EAF shop of PJSC “Seversky Pipe Plant” a technology for the formation of magnesian slags of rational composition was developed over the smelting periods in EAF-135. Introduction of the technology ensured the record resistance of the refractory lining of the furnace up to 1900 heats per campaign and high level of technological and technical-economic indicators of the process.

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16

Proust, Dominique. "Supergene Vermiculitization of a Magnesian Chlorite: Iron and Magnesium Removal Processes." Clays and Clay Minerals 34, no. 5 (1986): 572–80. http://dx.doi.org/10.1346/ccmn.1986.0340511.

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17

Stupen, Nonna, Alexander Kaklyugin, Lubov Kastornykh, and Viktor Kovalenko. "Pressed Magnesia Composites with Improved Weather Resistance Properties." Materials Science Forum 1043 (August 18, 2021): 27–35. http://dx.doi.org/10.4028/www.scientific.net/msf.1043.27.

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The results of studies aimed at increasing the resistance to weathering of building products based on magnesia cement are presented. This goal was achieved by the use of mine burnt rock as a modifying additive and the use of molding sands compaction pressing method. The influence of the modifier on the compressive strength change of compressed composites in dried and water-saturated state, the softening and air resistance coefficients, as well as the linear deformations of the control samples after a specified number of alternating wetting and drying cycles, was investigated. The physical and mechanical characteristics of the control samples were determined according to the standard and generally accepted methods. The formation of a complex combined structure of modified magnesian composites, containing coagulation, condensation and crystallization phases with a clear predominance of the first, has been confirmed by the physicochemical analysis methods. It is shown that modification of magnesian cement with burnt rock purposefully changes the processes of structure formation and causes an increase in water and air resistance of pressed composites based on it. The proposed method for modifying pressed magnesia products prevents loosening of their structure under alternating stresses, reduces linear deformations and, as a result, slows down fatigue failure. The involvement of a secondary resource in the composition of molding sands as an active mineral additive leads to a decrease in the cost of products and allows the method of their production to be attributed to the best available technologies. The developed compositions of pressed magnesia composites are recommended for the production of small-piece products used in building envelopes, as well as for flooring in the rooms with more than 60% humidity.

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18

DVORNIK, Gennadiy Petrovich. "Types of metasomatic rocks: temperature conditions, buildups, features of composition, minerageny." NEWS of the Ural State Mining University 1, no. 1 (March 23, 2020): 63–72. http://dx.doi.org/10.21440/2307-2091-2020-1-63-72.

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The relevance of the work is due to the importance of metasomatic rocks associated many ore and non-metallic mineral resources. Purpose of the work: study of temperature conditions of formation, the characteristics of the chemical and mineral composition, the mineralogy of metasomatites. Results. The extended classification of the main types of metasomatic rocks (alkaline, basic, acidic) formed in the early alkaline and acid stages of the hydrothermal process is given. Temperature conditions of formation, features of chemical and mineral composition and metasomatite mineralogeny are considered. Alkaline metasomatites are subdivided into potassium (pyroxene phenites, microclinites, biotite-orthoclase metasomatites, gumbaites) and sodium (nepheline-pyroxene phenites, albites, sodic alterations). Deposits of tungsten, molybdenum, gold and uranium are associated with potassium metasomatites (gumbaites), and deposits of beryllium, lithium, tantalum, and niobium are associated with sodium metasomatites (albite). The main metasomatic rocks (basificates) include calcium and iron-magnesian metasomatites (calcareous and magnesian skarns, diopside-lapis lazuli metasomatites, rhodingites, kamaforites, carbonatites, apocarbonate calcites, dolomite-ankerite, magnesite and sideroplesite metasomatites). The formation of deposits of iron, boron, and phlogopite is associated with skarn; deposits of rare-earth elements, tantalum, niobium, and apatite are associated with carbonatites. Acid metasomatites are subdivided into aluminous and siliceous. Aluminous metasomatites include propylites, chloritolites, microcline-sericite and tourmaline-sericite metasomatites, secondary quartzites, argillizated rocks. Alumina deposits (kaolins, bentonites) are associated with secondary quartzites. Siliceous metasomatites include the largest number of species: uralite metasomatites, greisens, listvenites and berezites, chlorite-sericite-quartz and sericite-quartz metasomatites, charoitites, serpentinites, nephrites, anthophyllite metasomatites, carbonate-talc metasomatites and talcites, magnetite quartzites, jaspers, jasperoids. There is a group of metasomatites among them consisting of quartz in association with hydrous alumosilicates (muscovite, topaz, and chlorite). The other group includes low-alumina metasomatites, the mineral composition of which is dominated by hydrous calcium and magnesian silicates (charoite, serpentine, antophyllite, tremolite, talc). The third group is represented by metasomatites of quartz composition (magnetite quartzites, jaspers, jasperoids). The formation of deposits of iron, tin, tungsten, molybdenum, gold, polymetals, nonmetallic raw materials (asbestos, talc, charoite, nephrite, jasper) is associated with siliceous metasomatites. Conclusions. According to the formation temperature, high-temperature (above 500o С), medium-temperature (500–300о С) and low-temperature (below 300o С) metasomatic rocks are distinguished. The average compositions of alkaline metasomatites are characterized by high concentrations of potassium or sodium oxides, the predominance of feldspars (orthoclase, microcline, albite) in association with pyroxenes, carbonates. The main metasomatites are distinguished by high contents of calcium, magnesium and iron oxides at low silica concentrations prevailing in the mineral composition of silicates (pyroxenes and garnets) or carbonates (calcite, dolomite, magnesite, breunnerite). The composition of acid metasomatites is characterized by high concentrations of alumina or silica, the predominance of hydrous aluminosilicates, silicates and quartz.

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19

Maryasev, I. G., V. N. Koptelov, F. S. Kaplan, and O. R. Grishina. "Thermal Expansion of Magnesian Materials." Refractories and Industrial Ceramics 44, no. 5 (September 2003): 338–42. http://dx.doi.org/10.1023/b:refr.0000009042.63398.e0.

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20

Suvorov, S. A., M. I. Nazmiev, R. S. Polovinkina, and I. G. Maryasev. "Water-resistant lime-magnesian clinker." Refractories and Industrial Ceramics 47, no. 5 (September 2006): 291–93. http://dx.doi.org/10.1007/s11148-006-0111-0.

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21

Tsymbal, O. S., and S. G. Kryvdik. "OLIVINES OF ALKALINE-ULTRABASIC ROCKS IN NORTH-WESTERN REGION OF THE UKRAINIAN SHIELD." Geochemistry and ore formation 44 (2023): 9–13. http://dx.doi.org/10.15407/gof.2023.44.009.

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Olivine (forsterite, rarely chrysoline) is characteristic mineral of alkaline-ultrabasic rocks in Noth-Western region of the Ukrainian shield. These rocks (melteigites, jacupirangites, melteigine-porphyries) form hypabissal intrusions and dikes. Olivines are earliest minerals but sometimes content inclusions of Cr-spinelids. Magnesian olivines are characterized by increased Cr and Ni contents, sometimes CaO that is typical for magnesian alkaline-ultrabasic rocks. By chemistry studied olivines are similar to those in kimberlites and lamproites.

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22

Pozo, Manuel, and José Calvo. "An Overview of Authigenic Magnesian Clays." Minerals 8, no. 11 (November 9, 2018): 520. http://dx.doi.org/10.3390/min8110520.

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Clay authigenesis mostly concerns: (a) the formation of clays by direct precipitation from solution, called “neoformation” and (b) development of clays by transformation of precursor minerals. Precipitation from solution implies that a new mineral structure crystallizes, so that a prior mineral structure is not inherited. Transformation of precursor detrital minerals, a process also termed “neoformation by addition”, can be conducted whether throughout precipitation on pre-existing natural surfaces or transformation and reaction on pre-existing surfaces. Both processes have been recognized as effective mechanisms in the formation of Mg-clays, which mostly include 2:1 clay minerals, such as talc-kerolite and Mg-smectites, as well as fibrous clays (sepiolite, palygorskite). Authigenic Mg-clay minerals occur in both modern and ancient marine and non-marine depositional environments, although formation of these clays in hydrothermal continental and seafloor settings must be also outlined. Most favourable conditions for the formation of Mg-clays on earth surface are found in evaporitic depositional environments, especially where parent rocks are enriched in ferromagnesian minerals. In these settings, Mg-clays are important constituent of weathering profiles and soils and can form thick deposits of significant economic interest. Based on this review of authigenic clay deposits, we propose three geochemical pathways, mainly related to continental environments, for the origin of authigenic Mg-clays: formation of Al-bearing Mg-clays (pathway 1), formation of Al-free Mg clays (pathway 2) and formation of sepiolite from other Mg-clay minerals (pathway 3).

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23

Plechov, P. Yu, V. D. Shcherbakov, and N. A. Nekrylov. "EXTREMELY MAGNESIAN OLIVINE IN IGNEOUS ROCKS." Геология и геофизика 59, no. 12 (2018): 2129–47. http://dx.doi.org/10.15372/gig20181212.

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Averina, G. F., V. A. Koshelev, and V. V. Zimich. "Investigation of magnesian foam concrete properties." IOP Conference Series: Materials Science and Engineering 451 (December 14, 2018): 012032. http://dx.doi.org/10.1088/1757-899x/451/1/012032.

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25

Plechov, P. Yu, V. D. Shcherbakov, and N. A. Nekrylov. "Extremely magnesian olivine in igneous rocks." Russian Geology and Geophysics 59, no. 12 (December 2018): 1702–17. http://dx.doi.org/10.1016/j.rgg.2018.12.012.

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26

Bischoff, William D., Miriam A. Bertram, Fred T. Mackenzie, and Finley C. Bishop. "Diagenetic stabilization pathways of magnesian calcites." Carbonates and Evaporites 8, no. 1 (March 1993): 82–89. http://dx.doi.org/10.1007/bf03175165.

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Lobachev, V. T., L. M. Rudakov, A. I. Kapusta, A. K. Klochko, I. M. Mishchenko, V. F. Kuz'menko, and V. I. Alekseev. "Production of high-basicity magnesian sinter." Metallurgist 31, no. 1-2 (February 1987): 3–4. http://dx.doi.org/10.1007/bf00749471.

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28

Dheilly, R. M., A. Bouguerra, B. Beaudoin, J. Tudo, and M. Queneudec. "Hydromagnesite development in magnesian lime mortars." Materials Science and Engineering: A 268, no. 1-2 (August 1999): 127–31. http://dx.doi.org/10.1016/s0921-5093(99)00085-4.

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Zhao, Zhenhua, Qiang Wang, Xiaolin Xiong, Hecai Niu, Haixiang Zhang, and Yulou Qiao. "Magnesian andesites in north Xinjiang, China." International Journal of Earth Sciences 98, no. 6 (August 9, 2008): 1325–40. http://dx.doi.org/10.1007/s00531-008-0339-7.

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30

Chever, L., S. Pavía, and R. Howard. "Physical properties of magnesian lime mortars." Materials and Structures 43, no. 1-2 (March 7, 2009): 283–96. http://dx.doi.org/10.1617/s11527-009-9488-9.

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31

Perrin, Jonathan, Daniel Vielzeuf, Didier Laporte, Angèle Ricolleau, George R. Rossman, and Nicole Floquet. "Raman characterization of synthetic magnesian calcites." American Mineralogist 101, no. 11 (November 2016): 2525–38. http://dx.doi.org/10.2138/am-2016-5714.

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32

Bourrié, Guilhem, Jihaine Ben Nacib, Georges Ona-Nguema, and Fabienne Trolard. "Absence of solid solution between Fe(II) and Mg(II) hydroxides and consequences on formation of fougerite and smectites." E3S Web of Conferences 98 (2019): 04003. http://dx.doi.org/10.1051/e3sconf/20199804003.

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As there exists extended solid solutions between ferrous and magnesian silicates, experiments were conducted to check if ferrous and magnesian hydroxides can co-precipitate in a solid solution. Results show that no solid solution forms and instead Fe(II) and Mg(II) hydroxides precipitate separately with the same solubilities as pure components. However, in fougerite, F(III), Fe(II) and Mg(II) coexist in a brucitic type hydroxide, with an extended solid solution. This implies that fougerite formation results from Fe(III) precipitation, Fe(III) being surrounded by divalent Fe(II) and Mg(II) to comply with the exclusion rule: Fe(III) ions cannot be direct neighbours. Consequently, Fe(III) - Fe(II) - Mg(II) smectites cannot form by oxidation of a ferrous magnesian brucitic layer, but by silication of fougerite. The impossibility of formation of a solid solution between Fe(II) hydroxide and Mg(II) hydroxide, while their electric charge and ionic radii are identical can be explained by the differences of electronegativities of the elements. Fe(II) and Mg(II) can dimerize separately in aqueous solution, but an heterodimer cannot form.

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33

Li, Jin Hong, Ling Xin Tong, and Wen Cai Zhou. "Phase Composition, Microstructure and Mechanical Properties of Aluminous Cements Containing Magnesium Aluminate Spinel." Key Engineering Materials 492 (September 2011): 467–71. http://dx.doi.org/10.4028/www.scientific.net/kem.492.467.

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A new type aluminous cement containing magnesium aluminate (MA) spinel was prepared from mixtures of limestone, magnesian and bauxite at different ratios by sintering process. The phase composition, microstructure and mechanical properties of aluminous cements containing magnesium aluminate spinel were investigated in this paper. According to the XRD results, the magnesium aluminate spinel (MA),calcium monoaluminate (CA) and calcium bialuminate (CA2) are the primary phases of the obtained aluminous cements with a small quantity of calcium silicoaluminate (C2AS) and remained alumina (Al2O3). The results of SEM indicate that the MA mainly exist in the shape of octahedron with the length of about 2-5 μm, and it is agglomerated with the tabular or flaky-shaped CA among the obtained aluminous cements. In addition, the compressive strength of castables containing obtained aluminous cements increase obviously with the content of CA rising or the curing time increasing.

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Lampropoulou, P., and C. Katagas. "MlNERALOGICAL STUDY AND PROPERTIES OF MAGNESIA REFRACTORIES DERIVED FROM EVIAN MAGNESITE." Bulletin of the Geological Society of Greece 36, no. 1 (January 1, 2004): 97. http://dx.doi.org/10.12681/bgsg.16585.

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In order for the Greek magnesia industry to retain a high position in the world market, the basic refractories derived from Greek magnesite must remain at the forefront of the international developments. A mineralogical study of magnesia materials produced from Evian magnesite has been carried out with the aim a) to provide detailed characterization of products and microstructures derived from the firing processes of magnesia raw materials and b) to contribute to the development of new magnesia-spinel refractory materials from natural Greek magnesite. The magnesite of N. Evia, Greece, is micro- crystalline and has been used for the production of basic refractories because of the very low amounts of impurities such as CaO, S1O2, FeO(tot), B2O3 it contains . Magnesia materials studied here are: 1) Raw materials. The dead- burned magnesia grains examined are divided into two groups according to the mode of beneficiation of the raw magnesite: a) Dead burned magnesias produced from natural microcrystalline magnesite (Group A). b) Dead burned magnesias of high purity produced from natural microcrystalline magnesite (Group B). The chemical composition of these materials lies essentially in the MgO-CaO-SiC>2 system, since they contain only trace amounts of Fe2Û3 and AI2O3. Their microstructures vary widely in terms of proportions of direct MgO-MgO bonding, amounts and types of phases of the siliceous bonding and size of the periclase crystals. Dead burned magnesias of high purity are better sintered and contain lower amounts of secondary phases compared to magnesias of lower purity. 2) Commercial magnesia bricks derived from dead burned magnesia of high purity and magnesia chromite bricks derived from raw materials of dead burned magnesia of high purity and chromite from Africa. 3) New spinel-based composition and new magnesia-spinel refractory materials which have been synthesized for the needs of this study. The newly synthesized spinel-based composition (70wt% Al2O3-30wt% MgO) shows an increase in the bulk density as well as in the amount of spinel formed compared to available commercial qualities (50%wt AI2O3). 4) Using this new spinel-based composition and dead burned magnesia of high purity, two new magnesia-spinel refractory materials containing 10 and 20wt% AI2O3 were produced, with the aim to obtain more friendly to the environment magnesia refractories to substitute for the magnesia chromite bricks. The compositions of the magnesia spinel refractories thus produced were expected to show endurance in thermal shocks as well as in the corrosion from slags and friction, in order to have a wide application in steel, cement industry etc .

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35

Rabilou, Souley Moussa, Malam Alma Maman Mousbahou, Mahaman Sani Laouali, Natatou Ibrahim, and Issa Habou. "Caractérisation Physico-Chimique Des Eaux Souterraines Du Socle De La Région De Zinder (Niger) Pendant La Saison Des Pluies Et La Saison Sèche." European Scientific Journal, ESJ 14, no. 27 (September 30, 2018): 317. http://dx.doi.org/10.19044/esj.2018.v14n27p317.

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Agriculture and livestock are the main socio-economic activities of the population of the Zinder region (Niger). However, these activities have negative impacts on groundwater quality, which is the main source of water supply for this population. In this work, the physicochemical quality of the waters of the Socle of the Zinder region was studied during the rainy and dry seasons. Twenty-four samples were the subject of a physico-chemical analysis. The data obtained were processed by the hydrochemical method by the Diagram software and the principal component analysis by the XLSTAT software. Of the waters analyzed, 83% have normal pH values (6.5 - 8.5) and 17% acid pH <6.5 during both seasons. The nitrate levels of Yekoua (62.04 and 63.36 mg.L-1), Dan Ladi (123.64 and 146.96 mg.L-1), Bourbourwa (64.65 and 80.08 mg.L -1) and Kazoé (130.68 and 124.52 mg.L-1) and fluoride of Kazoé (1.5 mg.L-1), Midik (1.6 mg.L-1) and Bourbourwa (2.98 mg.L-1) during both seasons are abnormal. Four facies characterize the analyzed waters, with a predominance of bicarbonated calci-magnesian(42%) during the rainy season, calci-magnesian bicarbonate (41.7%) and calci-magnesium chloride (41.7%) during the dry season. The residence time by hydrolysis and alteration of silicate rocks and the pluviolessivage of soils are the main mechanisms that govern the mineralization of these waters. These grades, call for remediation treatments. Clays could be promoters for this treatment because they are very available and less expensive.

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36

Mueller, Andreas G. "The Savage Lode magnesian skarn in the Marvel Loch gold–silver mine, Southern Cross greenstone belt, Western Australia. Part 1: Structural setting, petrography, and geochemistry." Canadian Journal of Earth Sciences 28, no. 5 (May 1, 1991): 659–85. http://dx.doi.org/10.1139/e91-059.

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The Marvel Loch mine in the Archean Yilgarn Block. Western Australia, has produced 9.70 t gold and 1.92 t silver from 3.28 × 106 t of oxide–sulphide ore. The deposit is located in the Southern Cross greenstone belt, and occurs within the medium-grade metamorphic aureole of the Ghooli Dome granitoid batholith, about 1.5 km from the granitoid–greenstone contact, The deposit is controlled by a broad ductile shear zone and spatially associated with late syn- to post-mineralization pegmatite dykes. The major orebodies, represented by the Savage Lode, are hosted by a uniform sequence of metakomatiites, and form zoned replacement bodies oriented subparallel to the steeply dipping foliation of the shear zone. Lens-shaped domains of pillowed metakomatiiles (hornblende + cummingtonite + chlorite) are locally preserved between the orebodies.The gangue of the Savage Lode is laterally zoned, and shows distinct similarities to Phanerozoic magnesian skarns. Calcite–olivine rock and calcite–phlogopite–chlorite schist occur in the centre, and are enveloped by three types of calcite-poor ore, namely banded diopside–amphibole rock, quartz–diopside veins, and tremolite–phlogopite schist. The latter grades laterally into subeconomic, outer tremolite–chlorite schists. Local retrogression of prograde alteration minerals is evident in the partial replacement of olivine by iddingsite and serpentine, and in the occurrence of late muscovite, clinozoisite, and prehnite. The gangue in the lode reflects strong carbon dioxide, calcium, and potassium metasomatism.Hydrothermal oxides and sulphides (2–5 vol.%) occur disseminated throughout the Savage Lode. The oxide assemblage includes hercynite–spinel, magnetite, ilmenite, and scheelite, whereas the sulphide assemblage is dominated by pyrrhotite, loellingite, and arsenopyrite. Native gold occurs as discrete grains (0.001–3 mm) intergrown with sulphides or enclosed in gangue minerals. The average magnesian ore skarn is characterized by a MgO–FeO ratio of 2.0:1, a Au–Ag ratio of 1.7:1, and low base metal (< 500 ppm), anomalous tungsten (20–40 ppm), and high arsenic (2900 ppm) contents. The Savage and other lodes in the Marvel Loch mine may be classified as gold or gold–silver skarns by economic metal content. The magnesian rather than calcic nature of the Marvel Loch skarns is related to the high magnesium content (21 wt.% MgO) of the precursor metakomatiite rocks.

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37

Richardson, J. A., and M. E. Evans. "Restoration of Grassland After Magnesian Limestone Quarrying." Journal of Applied Ecology 23, no. 1 (April 1986): 317. http://dx.doi.org/10.2307/2403099.

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38

Jiménez-López, Concepción, Christopher S. Romanek, F. Javier Huertas, Hiroshi Ohmoto, and Emilia Caballero. "Oxygen isotope fractionation in synthetic magnesian calcite." Geochimica et Cosmochimica Acta 68, no. 16 (August 2004): 3367–77. http://dx.doi.org/10.1016/j.gca.2003.11.033.

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39

Jimenez-Lopez, Concepción, Christopher S. Romanek, and Emilia Caballero. "Carbon isotope fractionation in synthetic magnesian calcite." Geochimica et Cosmochimica Acta 70, no. 5 (March 2006): 1163–71. http://dx.doi.org/10.1016/j.gca.2005.11.005.

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40

Mabry, James C., and Kanchan Mondal. "Magnesian calcite sorbent for carbon dioxide capture." Environmental Technology 32, no. 1 (January 2011): 55–67. http://dx.doi.org/10.1080/09593330.2010.486843.

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41

Cheshire, Michael, and Necip Güven. "Conversion of chrysotile to a magnesian smectite." clays and clay minerals 53, no. 2 (April 1, 2005): 155–61. http://dx.doi.org/10.1346/ccmn.2005.0530205.

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42

Bayliss, Peter, and Slade St J. Warne. "Powder X-Ray Diffraction Data of Magnesium-Chlorophoenicite." Powder Diffraction 2, no. 4 (December 1987): 225–26. http://dx.doi.org/10.1017/s0885715600012835.

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AbstractMagnesium-chlorophoenicite may be differentiated from the Mn-analogue chlorophoenicite, because for magnesium-chlorophoenicite at 7Å, whereas for chlorophoenicite.In a review of the literature for the Mineral Powder Diffraction File by Bayliss et al. (1980), powder X-ray diffraction data could not be found of the mineral species magnesium-chlorophoenicite, (Mg,Mn)3Zn2(AsO4)(OH,O)6. Dunn (1981) states that the powder X-ray diffraction data of magnesium-chlorophoenicite is essentially identical to that of chlorophoenicite (Mn analogue) and confirms that the minerals are isostructural.With the crystal structure parameters determined by Moore (1968) for a Harvard University specimen from New Jersey of chlorophoenicite, a powder X-ray diffraction pattern was calculated with the programme of Langhof, Physikalische Chemie Institute, Darmstadt. The calculated pattern was used to correct and complete the indexing of the powder X-ray diffraction data of chlorophoenicite specimen ROM M15667 from Franklin, Sussex County, New Jersey, U.S.A. by the Royal Ontario Museum (PDF 25-1159). With the correctly indexed data of ROM M15667, the unitcell parameters were refined by least-squares analysis and are listed in Table 1.The most magnesium-rich magnesium-chlorophoenicite found in the literature is a description of Harvard University specimen 92803 from Franklin, Sussex County, New Jersey, U.S.A. by Dunn (1981), where Mg is slightly greater than Mn. A 114.6 mm Debye-Schemer film taken of HU92803 with Cu radiation and a Ni filter (CuKα = 1.5418Å) was obtained from Dr. P. Dunn and measured visually. The unit-cell parameters, which were refined by least-squares analysis starting from the unit-cell parameters of PDF 25-1159 in space group C2/m(#12), are listed in Table 1, and give F28 = 4.1(0.050,136) by the method of Smith & Snyder (1979).The hkl, dcalulated, dobserved and relative intensities (I/I1) of HU92803 are presented in Table 2. With the atomic positions and temperature factors of chlorophoenicite determined by Moore (1968), the Mn atomic positions occupied by 50% Mg and 50% Mn, and the unit-cell parameters of HU92803, a powder X-ray diffraction pattern was calculated and Icalculated is recorded in Table 2. A third powder X-ray diffraction pattern was calculated with the Mn atomic positions fully occupied by Mg. Because the atomic scattering factor of Mn is more than twice greater than Mg, chlorophoenicite may be differentiated from magnesium-chlorophoenicite based upon the calculated intensities of the first three reflections given in Table 3.Although the a, c and β unit-cell parameters of chlorphoenicite are similar to those of magnesium-chlorphoenicite, the b unit-cell parameter of chlorophoenicite is significantly greater than that of magnesium-chlorophoenicite (Table 1). The b unit-cell parameter represents the 0–0 distance of the Mn octahedra (Moore, 1968). Since the size of Mn is greater than that of Mg, chlorophoenicite may be differentiated from magnesium-chlorophoenicite based upon the b unit-cell parameter given in Table 1.American Museum of Natural History (New York, N.Y., U.S.A.) specimen 28942 from Sterling Hill, Ogdensburg, New Jersey is composed of willemite, haidingerite and magnesian chlorophoenicite. A spectrographic analysis of the magnesian chlorophoenicite shows As, Mg, Mn and Zn. Powder X-ray diffraction data (PDF 34-190) of the magnesian chlorophoenicite was collected by diffractometer with Cu radiation and a graphite 0002 monochromator (Kα1 = 1.5405) at a scanning speed of 0.125° 2θ per minute. The unit-cell parameters, which were refined by leastsquares analysis starting from the unit-cell parameters of PDF 25-1159, are given in Table 1. Specimen AM 28942 is called chlorophoenicite, because of its large b unit-cell parameter (Table 1), and the I/I1 of 25 for reflection 001 and of 50 for reflection 201 compared to the Icalculated in Table 3.

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43

Mittlefehldt, David W., and Marilyn M. Lindstrom. "Magnesian basalt clasts from the EET 92014 and Kapoeta howardites and a discussion of alleged primary magnesian HED basalts." Geochimica et Cosmochimica Acta 61, no. 2 (January 1997): 453–62. http://dx.doi.org/10.1016/s0016-7037(96)00357-2.

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44

Sharandin, K. N., G. G. Nemsadze, A. N. Smirnov, R. A. Jojua, and D. V. Ryaby. "Improving the hot-repair technology for lining a converter using GIR-RB-X developed magnesia mass of the company GIR-ENGINEERING." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 4 (April 30, 2019): 3–7. http://dx.doi.org/10.17073/1683-4518-2019-4-3-7.

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The analysis of the methods of hot repair of areas of advanced wear of the working lining of converters has been performed. A method for assessing the quality of a self-flowing magnesian fermentation mass on a rotary-type laboratory furnace has been developed. A repair mass of the brand GIR-RB-X has been developed, based on secondary raw materials, which allows to effectively restore the areas of the refractory lining of the converter, which are subject to advanced wear. Industrial tests of a self-flowing magnesian repair mass on the linings of heavy-duty converters were conducted under the conditions of PJSC DMK and PJSC «MK «Azovstal». The company GIRENGINEERING Ltd organized mass production of the mass of the brand GIR-RB-X in PJSC KrOZ. Ill. 6. Ref. 11. Tab. 1.

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45

Berzin, S. V., K. S. Ivanov, and E. V. Burlakov. "Finding the refractory inclusions in the meteorite Severny Kolchim (H3)." Доклады Академии наук 487, no. 6 (September 10, 2019): 650–52. http://dx.doi.org/10.31857/s0869-56524876650-652.

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For the first time refractory forsterite rich objects were installed in meteorites in the meteorite Severny Kolchim (H3). Refractory forsterite rich objects are found mainly in carbonaceous chondrites, their finds in ordinary chondrites are wery rare. These inclusions are considered by most researchers as one of the earliest formations in the Solar System. The inclusions in the Severny Kolchim meteorite consist of high-magnesian forsterite (FeO 0,4-2%), CaO 0,5-1%, Al2O3 up to 0,4% and depleted by MnO. Some forsterite are intergrown with high-magnesian enstatite (FeO 0,5-2,5%), CaO up to 0,5%, Al2O3 up to 1,5% and depleted by MnO. A characteristic feature of forsterite-rich inclusions is that, unlike chondras, they are mostly represented by acute-angled fragments, which is probably due to their relatively frequent collisions.

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46

Warren, R. G., and B. J. Hensen. "Peraluminous sapphirine from the Aileron district, Arunta Block, central Australia." Mineralogical Magazine 51, no. 361 (September 1987): 409–15. http://dx.doi.org/10.1180/minmag.1987.051.361.07.

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AbstractSpecimens collected from a small lens of phlogopite-rich rock in the granulite-facies terrain of the Arunta Block, central Australia, have unusual bulk compositions and mineral assemblages. One sample consists of phlogopite enclosing blue spinel (mg 96) with minute granules of corundum and sapphirine at the margins; a second of phlogopite enclosing porphyroblasts of corundum and peraluminous sapphirine. In the first the sapphirine is close to the 7 : 9 : 3 composition; in the other it is markedly peraluminous, e.g. (Mg1.628Fe0.028)Al4.714Si0.636O10, intermediate between the 7 : 9 : 3 and 3 : 5 : 1 members. The texture suggests that this sapphirine is a stable phase in equilibrium with eastonitic phlogopite and corundum. The very potassic, very magnesian bulk composition of the rocks is attributed to potassium metasomatism of a protolith consisting of magnesian chlorite and quartz.

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47

Pedersen, A. K. "Reaction between picrite magma and continental crust: early Tertiary silicic basalts and magnesian andesites from Disko, West Greenland." Bulletin Grønlands Geologiske Undersøgelse 152 (January 1, 1985): 1–126. http://dx.doi.org/10.34194/bullggu.v152.6694.

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The Kûgánguaq Member is a lava and tuff sequence comprising about 7.S km3 of magnesian silicic basalts (92%), magnesian andesites (7%) and feldspar-phyric silicic basalts ( 18%) through reaction with crustal rocks, presumably Cretaceous sand or siltstones. The reaction led to sulphide fractionation and to magma modification which cannot be explained in terms of crystal fractionation or by simple mixing between magma and contaminants. The transition element (Fe, Ti, Vand Cr) concentrations in rocks, glasses and minerals indicate that the Kûgánguaq Member rocks equilibrated at oxygen fugacities several orders of magnitude below the FMQ buffer, but above the IW-buffer. The partitioning of vanadium between olivine and glass and between chromite and glass show particularly large variations and appears to be the most sensitive recorder of fo2 variations in the range between the FMQ and IW buffers at high igneous temperatures.

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48

Opanasenko, N. Ye, A. P. Yevtushenko, and A. P. Grishina. "Magnesian alkalinity of trenching soils of Prichernomorskaya lowland." Fundamental and Applied Soil Science 15, no. 1-2 (March 18, 2014): 33–41. http://dx.doi.org/10.15421/041403.

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The data of scientists about spreading, genesis, composition and properties of low natrium soils with high content of magnesium in soil sorption complex, and its influence on plants have been considered. The aim was to determine the absorbed ability of soils and the level of saturation by bases; to determine the dependence of density of foundation, quantity of silt from the content of absorbed magnesium from magnesium water soluble salts in them; to determine kation-anion and salt composition of irrigation waters. The trenching low natrium remaining alkolinic south black soils, dark-chestnut, turf-steppe black soils of Prichernomorskaya lowland with content 20–73 % Mg2+ in soil sorption complex and also irrigation waters have been studied. Physical clay, silt, volumetric mass, general porosity, air-volume, water-permeability, micro-aggregate composition, absorbed base, kation-anion composition of easy soluble salts and hypothetic salts have been determined in soils. Kation-anion composition and hypothetic salts have been determined in irrigation waters. The sum of absorbed bases in studied soils corresponded to the content of fraction of physical clay and silt, and also to the provision of soils with organic substances. The humus reserves in trenching layer 0–60 cm of black south soils were 200–240 t/ha, dark-chestnut soils – 150–180 t/ha, turf-steppe light suglinic – soils 80–130 t/ha/ That’s quite normal that south black soils (30 mg-eq./100 gr.) have the best absorbed ability, and the turf-steppe susand soils have the worst absorbed ability (9 mg-eq./100 gr.). Accordance of absorptive ability of soils to the content of fraction of physical clay, silt, humus has been determined. The largest content and variation of absorbed magnesium in soil sorption complex of trenching layers of light suglinic and susand turf-steppe soils of high river terraces and the lowest content in black south soils and dark-chestnut soils have been established. It has been established that for genetically different soils with high content of exchanged magnesium the high density of formation, low general porosity, air-volume, water-irrigation, micro-aggregation and also clods, cracks and dust in dry condition, absence of illuviration are typical. Kation-anion composition of easy soluble salts in soils and in irrigation waters has been analyzed in details. The sum of all toxic water soluble salts in black south soils was 0.31 mg-eq./100 gr., magnesium salts (MgCO3, Mg(HCO3)2, MgCl2, MgSO4) – 0.18 mg-eq./100 gr. or 58 % from the sum of toxic salts. In dark-chestnut soils these indexes were 0.16 and 0.11 mg-eq./100 gr. and 69 %; in turf-steppe light suglinic soils – 0.32 and 0.18 mg-eq./100 gr. and 56 %; and for turf-steppe susand soils they were 0.26 and 0.15 mg-eq./100 gr. and 58 %. In all soils chlorides magnesium prevailed over toxic salts (NaCl+MgCl2+CaCl2). In south black soils and turf-steppe soils in layer 0–60 cm there were both toxic and magnesium salts. Dark-chestnut soils in comparison with above said ones have less toxic salts and less magnesium salts, but their part in the sum of all salts was the highest – 69 %. The less content of toxic salts in dark-chestnut soils in comparison with others is attributed to their location to good drained height in Ochakov region. Probability of irrigation magnesium solonetzation of soils under long watering of orchards and vineyards by water from artesian well, Ingulets canal and from pond has been studied. In fresh and weakly mineral waters among toxic salts the magnesium salts (67-88%) as also in soils, chloride of magnesium are prevailed. Prevailing of magnesium over calcium in irrigated waters reduces quality of water and leads to accumulation of Mg2+ in soil sorption complex and negatively influences on soils. The following conclusions have been done: Genetically different low natrium remaining alkolinic with high content of exchanged magnesium in soil absorption complex trenching soils are characterized by high density, low porosity, air-volume, water-permeability, micro-aggregation and also clods, cracks and dust in dry condition, absence of illuviration. In soils and irrigation waters magnesium salts prevail over toxic easy soluble salts (67–88 % and 56–69 %). There are the probable sources of large accumulation of magnesium in soil absorption complex, magnesium solonetziration and the reason of unfavourable soil conditions.

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49

Lytkina, E. "Mixed magnesian binders using local silicate waste production." Journal of Physics: Conference Series 2131, no. 4 (December 1, 2021): 042035. http://dx.doi.org/10.1088/1742-6596/2131/4/042035.

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Abstract Today, the waste of the mining industry is more than 8 billion tons. Analysis of the literature data showed that most of the man-made waste that is generated as a result of the development of mineral deposits is suitable for use in many industries, in particular, in the production of building materials. The use of technogenic raw materials allows us to solve the following tasks: Environmental aspect - reducing the number of dumps and reducing their volumes. And this, in turn, improves the ecology of regions and territories. 2. Economic aspect - reducing the cost of construction products through the use of almost free raw materials, the release of more competitive products. Of course, it is necessary to provide that part of the costs will be spent on additional processing, revision, activation, modification of this technogenic raw material component. But today we have to think about how to clear the territory of substandard “waste rock” and use it to reduce the production and consumption of natural raw materials. A similar process can create waste-free production.

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50

Egorova, Anastasiya, Liya Zhirkova, and Zarmena Emelianova. "Hongurin as hydraulic additive to magnesian-binding substance." IOP Conference Series: Materials Science and Engineering 365 (June 2018): 032065. http://dx.doi.org/10.1088/1757-899x/365/3/032065.

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