Journal articles: 'Bauxite ore'

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Daya, Audu M., Ahmad I. Haruna, Abubakar S. Maigari, and Isah Yahuza. "Resource Assessment and Possible Industrial Applications of Bauxite Occurrences in Parts of the Mambila Plateau, NE Nigeria." European Journal of Environment and Earth Sciences 3, no. 2 (March 10, 2022): 19–23. http://dx.doi.org/10.24018/ejgeo.2022.3.2.244.

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Bauxites are normally formed from underlying aluminosilicate rocks as a result of tropical weathering. In our previous 2 papers, we presented the Geology, possible host, mineralogy, and geochemistry of the bauxites of Mambila Plateau, NE Nigeria. The bauxite was formed from residual chemical weathering of trachyte and occurs as a blanket cover over saprolite. XRD results showed gibbsite as the major mineral with small amounts of hematite, kaolinite, and quartz. Geochemistry of the bauxite ore is characterized by enriched Al2O3 (39.50-78.20.0%), erratic amounts of SiO2 (2.89-5.13%) and Fe2O3 (5.98-21.96%). In this study, the resources of Mambilla Bauxite Deposits (Block I and Block II) have been estimated to be 7,529,312.5 metric tons using block method of vertical geological cross-section bearing in mind that the Mambilla Bauxite Deposits have been explored by pitting on a regular grid pattern of 100 m×100 m. The bauxite deposit in Block II has met the requirement for metallurgical grade bauxite as standard specification (IS: 5953-1985, Reaffirmed [1]). While, Block I deposit has not met such specifications. Sustained investment in bauxite exploration is required to upgrade the ore reserves for sustainable development of a mining enterprise.

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Cvetkovic, Zeljko, and Pavle Tancic. "Mineralogical and crystallographic characteristics of bauxites from some Grebnik’s (Metohija, Serbia) ore deposits." Annales g?ologiques de la Peninsule balkanique 80, no. 1 (2019): 45–61. http://dx.doi.org/10.2298/gabp19010045c.

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Five typical bauxite samples from three ore deposits from the wider area of Grebnik Mt. (Metohija, Serbia) were examined with the optical microscopic, X-ray powder diffraction (XRPD) and chemical methods. The occurrences in bauxites were studied and described and the presence of major minerals was determined: diaspore, boehmite and hematite; minor minerals: quartz, goethite, rutile, kaolinite and hydro-hematite; as well as anatase, brookite, magnetite and chromite, which occur only sporadically. According to the quantity of main Al-bearers, three types of bauxite ore were recognized: diaspore, boehmite and boehmite-diaspore. Unit cell dimensions of major minerals were determined, mostly with values within reference data. However, all of the studied hematites have smaller a0 and V0 values, most probably due to the substitution of Fe3+ by Al3+. All samples are further classified as iron-rich and ferritic bauxites. It was found that there were changes in origin conditions between major Al-hydroxides minerals and hematite, as well as between the diaspore and boehmite. Determined chemical compositions put this raw material into high-quality raw materials for obtaining the electro corundum and alumina. The synthesis of the obtained data indicate that Grebnik?s bauxites have some unique characteristics, more or less different from most of the World?s known bauxite ore deposits.

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Radusinović, Slobodan, and Argyrios Papadopoulos. "The Potential for REE and Associated Critical Metals in Karstic Bauxites and Bauxite Residue of Montenegro." Minerals 11, no. 9 (September 7, 2021): 975. http://dx.doi.org/10.3390/min11090975.

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Research for critical raw materials is of special interest, due to their increasing demand, opulence of applications and shortage of supply. Bauxites, or bauxite residue after alumina extraction can be sources of critical raw materials (CRMs) due to their content of rare earth elements and other critical elements. Montenegrin bauxites and bauxite residue (red mud) are investigated for their mineralogy and geochemistry. The study of the CRM’s potential of the Montenegrin bauxite residue after the application of Bayer process, is performed for the first time. Montenegrin bauxites, (Jurassic bauxites from the Vojnik-Maganik and Prekornica ore regions from the Early Jurassic, Middle Jurassic-Oxfordian and Late Triassic paleorelief) are promising for their REE’s content (around 1000 ppm of ΣREE’s). More specifically, they are especially enriched in LREEs compared to HREEs. Regarding other CRMs and other elements, Ti, V, Zr, Nb, Sr and Ga could also be promising. In bauxite residue, the contents of Zr, Sr, V, Sc, La, Ce, Y, Ti and Nb are higher than those in bauxites. However, raw bauxites and bauxite residue as a secondary raw material can be considered as possible sources of CRMs.

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Nguyen, Minh Van, and Hau Van Nguyen. "Recovery of bauxite ore particles -1mm from tailings of the Tan Rai bauxite processing plant by mechianical classifiers." Journal of Mining and Earth Sciences 62, no. 3b (July 20, 2021): 51–57. http://dx.doi.org/10.46326/jmes.2021.62(3b).06.

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Tailings of the Tan Rai bauxite mineral processing plant contain a relatively high proportion of fine bauxite ore particles of less than 1mm. This amount of discarded fine bauxite particles necessarily leads to a high loss of valuable bauxite mineral and also require more tailings dam space. Recovery of such fine bauxite ore particles may produce certain economic and environmental effects to the current processing plant. The paper presents results of the study on recovery of fine bauxite ore particles -1 mm from tailings of the Tan Rai - Lam Dong bauxite mineral processing plant by the use of mechanical classifiers. The obtained +0.5 mm bauxite concentrate are suitable for blending with the +1 mm concentrate of the current plant. The study results showed that recovery of fine bauxite ore particles -1mm from the plant tailings may produce additional amount of valuable concentrate to ensure the supply requirements to the alumina plant and also add some values to the effective mineral resource utilization and bring some economic efficiency.

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Jalili, Zahra, Ataallah Bahrami, Masoud Ghadri, Behzad Nemati Akhgar, and Fatemeh Kazemi. "Leaching for iron removal from low-grade bauxite ore to access refractory instruction." Rudarsko-geološko-naftni zbornik 37, no. 1 (2022): 55–64. http://dx.doi.org/10.17794/rgn.2022.1.6.

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Iron-bearing minerals are the most important interfering compounds that are found with bauxite reserves. The element iron has adverse effects on bauxite applications, including the use of bauxite in refractory soils. The purpose of this research is to investigate the possibility of iron removal from low-grade bauxite ores to utilize them in refractory industries. For achieving this purpose, iron removal tests were performed on bauxite samples with an alumina to silica modulus of 0.73. After determining the appropriate iron removal method among the magnetic separation, calcination, and leaching (with H2SO4 and HCl) processes, optimal separation conditions were determined by tests that were designed using the Taguchi method. According to leaching results, using HCl for raw feed (un-calcined) provided the best result for iron removal. During this test, Fe2O3 grade decreased from 5.14% to 0.08%, and the alumina to silica modulus increased to 0.75. Calcination of the concentrate obtained from this test has led to favorable results in reducing the Fe2O3 grade (0.04%) and increasing the Al2O3 grade. Afterwards, in tests designed by the Taguchi method, the effect of parameters such as time, process temperature, HCl concentration, and feed grain size on iron removal from bauxite by HCl leaching processes are discussed. According to the results, the best efficiency of iron removal for a feed grain size of 250 µm is achieved in the following conditions: 30% HCl, process temperature of 25°C, and process time of 120 minutes. In this case, iron removal efficiency and Fe2O3 grade in process concentrate are 92.78% and 0.56%, respectively.

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Melo, Caio C. A., Rômulo S. Angélica, and Simone P. A. Paz. "A Method for Quality Control of Bauxites: Case Study of Brazilian Bauxites Using PLSR on Transmission XRD Data." Minerals 11, no. 10 (September 28, 2021): 1054. http://dx.doi.org/10.3390/min11101054.

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Available Alumina (AvAl2O3) and Reactive Silica (RxSiO2), the main parameters of bauxite controlled in the beneficiation process are traditionally measured by laborious, expensive, and time-consuming wet chemistry methods. Alternative methods based on XRD analysis, capable to provide a reliable estimation of these parameters and valuable mineralogical information of the ore, are being studied. In this work, X-ray diffraction data in transmission mode was used to estimate AvAl2O3 and RxSiO2 from Brazilian bauxites using the Partial Least Square Regression (PLSR) statistical tool. The proposed method comprises a routine of sample classification according to their similarities by Principal Component Analysis (PCA) and K-means, calibration of the PLSR model for each group of samples, grouping new bauxite samples according to the generated clustering model, and subsequent estimation of the parameters AvAl2O3 and RxSiO2 using the PLSR models for these samples. The results showed good accuracy and precision of the models generated for samples of the main ore lithology. The quality and pre-processing of the XRD data required for this method are discussed. The results demonstrated that this method has the potential to be industrially applied to quality control of bauxites as a rapid and automated procedure.

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Atakoglu, Ozge Ozer, and Mustafa Gurhan Yalcin. "Geochemical characterization of the Sutlegen bauxite deposit, SW Antalya." Mining of Mineral Deposits 15, no. 3 (September 2021): 108–21. http://dx.doi.org/10.33271/mining15.03.108.

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Purpose.The purpose is to determine geological and geochemical characteristics of the Sutlegen (Antalya, Turkey) bauxites, to identify the elements that played a major role in their formation. Methods. X-ray diffraction (XRD) mineral phase analysis, X-ray fluorescence (XRF) elemental analysis, plasma-mass spectrometry (ICP-MS), the petrographic and mineralogical analyses, and multivariate statistical methods were used. Findings. The major element content of the ore was determined as Al2O3 (60-35.2 wt%), SiO2 (39.5-0.2 wt%), Fe2O3 (48.4-19.5 wt%), TiO2 (36.9-16 wt%), and P2O5 (0.5-0.1 wt%). The Sutlegen region, which shows epirogenetic action with the uplift of the earth's crust, is generally rich in neritic carbonates. It was revealed that the bauxite ores have undergone moderate and strong laterization as a result of the deferruginization in the environment, and they were classified into four groups as lateritic, ferritic, kaolinitic, and bauxite. The increase in the aluminosilicate minerals, which were formed during the formation of bauxite in the environment was found to be directly proportional to the laterization processes. In this context, it was considered that the lateritic material that was firstly formed in the environment filled the cavities and pores of the karst-type limestones and sedimentary units in the region by superficial transfer phenomena. The bivariate diagrams of Log Cr vs. Log Ni revealed that the bauxite that formed in the region had an ultrabasic source. Originality. In literature, no scientific studies have been found on bauxite mineralization in the Sutlegen deposits that have been operated for a long period. Practical implications. In this context, the geochemical characteristics of bauxites revealed that the source of the laterization process in the region was the ultrabasic igneous rocks. The lateritic material moved by superficial transfer was accumulated on sandstone, claystone, siltstone, and limestone and in karstic cavities; then, it formed karstic bauxite (kaolinitic and bauxite) of different classifications due to the effect of metamorphism.

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Aziz, Israa A., Moayyed G. Jalhoom, and Muhanad A. Kheriallah. "Extraction of Zirconium From Iraqi Bauxite Ore." Engineering and Technology Journal 38, no. 10A (October 25, 2020): 1421–29. http://dx.doi.org/10.30684/etj.v38i10a.523.

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This research is devoted to the study of the extraction of zirconium from Iraqi Bauxite Ore by using hydrometallurgical method. The chemical analysis was done to the bauxite ore by using X-ray florescence, X-ray diffraction and atomic absorption spectroscopy. Zirconium Extraction was performed via three stages; the first stage is leaching of bauxite with sodium hydroxide for alumina leaching. The second stage is leaching of zirconium species from the remained powder produced from stage one after washing with deionized water and, nitric acid (HNO3 solutions). The results of the first stage has reflected the recovery of 42.27 % of Al2O3 which has been leached 100°C temperature, 7.5 molar of NaOH, liquid to solid ratio of 20/1, and stirring rate 450 rpm. The highest leaching percent of zirconium (Zr%) from the red mud approached 98.48 % at 100°C temperature, 7 molar acid concentration, 120 min. contact time, solid to liquid ratio (S/L) of 16/1, and stirring rate of 450 rpm. 99.47% recovery of zirconium was accomplished from nitric acid solutions by use of 3molar tri-n-butylephosphate (TBP)in kerosene at ,contact time for 6 min, and organic to aqueous phase (O/A) of 4/1.

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Khan, Z. S., S. M. Shaikh, and A. B. Ade. "Effect of pH on Metal Extraction From Bauxite Ore by Thiobacillus Ferrooxidans." Journal of Scientific Research 2, no. 2 (April 27, 2010): 403–6. http://dx.doi.org/10.3329/jsr.v2i2.4020.

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The extremophile, Thiobacillus ferrooxidans was selected to study the effect of pH on metal extraction from bauxite ore. This bacterium was inoculated in 9K medium having different pH, along with the bauxite ore, as metal source. After one month of incubation the extraction of metals aluminum and iron was measured by spectrophotometric methods. It was found that the extraction of aluminum was found better as compare to iron from bauxite at pH 2. Keywords: Aluminum; iron; metal extraction; pH; Thiobacillus ferrooxidans. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i2.4020 J. Sci. Res. 2 (2), 403-406 (2010)

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van Chanh, Nguyen, Mitsuhiro Shigeishi, and Tran Quoc Tho. "Inorganic Composite Material Based on Fly Ash, Red Residue from Bauxite Ore for Road Building Projects in Vietnam." Advanced Materials Research 383-390 (November 2011): 2774–81. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2774.

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The paper present solidifying technology based on geopolymer theory of inorganic composite materials from bauxite, red residue from bauxite ore, fly ash and activators for road building projects in Vietnam. This study describes physical properties and chemical compositions of bauxite, red residue, fly ash and the effects of bauxite-red residue-fly ash-activator mixes on the geotechnical properties of inorganic composite materials. Mixture design and testing procedures for inorganic composite materials. New inorganic composite materials have high durability and ability to water resistance. The presentation also show microstructure analysis of inorganic composite materials based on bauxite residue, fly ash and activators by X-ray diffraction, Infrared spectroscopy (IR), transmission electron microscopy (TEM) display high density, and modified microstructure of inorganic composite materials. Construction method of road using inorganic composite materials is also presented.

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Jafar, N., S. R. Nurhawaisyah, S. Widodo, C. A. Chalik, and M. H. Wakila. "Mineralogical Study of Bauxite of Kenco Area, Landak District, West Kalimantan Province, Indonesia." IOP Conference Series: Earth and Environmental Science 1134, no. 1 (January 1, 2023): 012025. http://dx.doi.org/10.1088/1755-1315/1134/1/012025.

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Abstract Indonesia is a country with a tropical climate that allows for high levels of weathering. Bauxite is the result of weathering rocks that have high aluminum content, low iron content, and little quartz content. The formation of bauxite deposits is controlled by source rock which is rich in Al element, tropical climatic conditions, and geomorphological conditions that allow the formation of the accumulation of weathered source rock products. The altered silicate minerals due to weathering result in the silica element being released from the crystal bonds and some iron are released so that the aluminum element is concentrated as a residual precipitate. X-ray diffraction (XRD) analysis on 16 bauxite samples which are estimated to represent the overburden horizon, bauxite ore horizon, clay horizon, and source rock to establish the mineral composition of bauxite. Mineral groups in the overburden horizon, bauxite ore horizon, and clay horizon are alumina, iron, titanium, silicates, carbonates, sulfides, and sulfates, while mineral groups in source rock are iron, titanium, silicate, sulfide, and sulfate. The type of bauxite in the study area is gibbsite bauxite based on the dominant appearance frequency of gibbsite compared to mineral corundum as an alumina group.

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Liu, Zheng-Gen, Man-Sheng Chu, Zheng Wang, Wei Zhao, and Jue Tang. "Study on Metallized Reduction and Magnetic Separation of Iron from Fine Particles of High Iron Bauxite Ore." High Temperature Materials and Processes 36, no. 1 (January 1, 2017): 79–88. http://dx.doi.org/10.1515/htmp-2015-0005.

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AbstractHigh iron bauxite ore is a typical unmanageable polyparagenetic resource and owns high comprehensive utilization value. Separation of iron from fine particles of high iron bauxite ore by the process of metallized reduction and magnetic dressing was researched systemically. The effect of magnetic field intensity, reduction temperature, reduction time, mole ratio of fixed carbon to reducible oxygen (FC/O) and ore particles size on separation indexes was researched. The results show that, with the conditions of reduction temperature of 1,400 °C, reduction time of 180 min, FC/O of 2.0, ore particle size of –2.0 mm and magnetic field intensity of 40 KA/m, about 89.24 % of the iron could be removed from high iron bauxite ore as metallic iron. Meanwhile, 86.09 % of the aluminum is stayed in non-magnetic fraction as alumina. However, the formation of hercynite (FeAl2O4) limits the reduction rate of iron oxides to metallic iron. The lower reduction conditions and higher recovery ratio of iron could be achieved with adopting ore-coal composite agglomerates or adding catalyst.

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Fosu, A. Y., N. Fosu, K. B. Owusu, and J. R. Dankwah. "Carbothermal Upgrading of the Awaso Bauxite Ore using Sawdust and Coconut Shells as Reductant." Ghana Mining Journal 16, no. 2 (December 20, 2016): 58–64. http://dx.doi.org/10.4314/gm.v16i2.8.

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Ghana’s bauxite is exported in the raw state with no value addition. One way to achieve value addition is to carbothermally upgrade the ore into magnetic and nonmagnetic fractions, followed by separation using a magnet. This work investigates the carbothermal upgrading of the Awaso bauxite ore using reductant generated from locally available saw dust (SD) and coconut shells (CNS). Composite pellets of bauxite-reductant were prepared, air-dried and cured for 72 hours. The cured pellets were placed in a fire-clay crucible and heated in a custom-made gas-fired furnace for 30 minutes. The fired composite pellets were separated into magnetic and non-magnetic portions using a low intensity hand-held magnet. The various portions were then characterised using XRD, XRF and SEM analyses. XRD results showed magnetite as the predominant species present in the magnetic fraction whilst the non-magnetic fraction showed alumina as the predominant peaks along with some traces of unreduced hematite, silica, carbon and titania but no hercynite. Keywords: Bauxite, Palm Nut Shells, Gas-Fired Furnace, Hercynite, Char

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Sojien, Taylor Moise, Estelle Lionelle Tamto Mamdem, Armand Sylvain Ludovic Wouatong, and Dieudonne Lucien Bitom. "Mineralogical, Geochemical and Distribution Study of Bauxites in the Locality of Bangam and Environs (West Cameroon)." Earth Science Research 7, no. 1 (January 24, 2018): 117. http://dx.doi.org/10.5539/esr.v7n1p117.

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The bauxite duricrust in the Bangam and surroundings is classified into three major storey levels as follows: the upper level on top of the plateaus where the continuous bauxites outcrop in slabs over distances of about 1 km, the intermediate level on top and at the flanks of the hills where the bauxites flush in metric blocks, the lower level at the talwegs where bauxites duricrust are gravels. The average thickness of the duricrust is 9.6m and extends over an area of about 9.5km2. Five types of facies are encountered here: nodular, pisolitic, pseudobreccia, vacuolar and massive. These different facies were carried out by X-ray fluorescence spectrometry, X-ray diffractometric, thermal analysis (ATD / ATG) and by polarizing microscope observation. The results of these analyses show that, gibbsite is the dominant mineral; kaolinite, anatase, hematite, goethite, magnetite and ilmenite are also present. The chemical composition of the major elements that characterize bauxites are 38-60% Al2O3; 2 -22% SiO2 and 9-42% Fe2O3. These values are almost similar to those obtained in Doumbouo-Fokoué, Ghana, Ngaoundal, and Minim-Martap precisely at Briskok prospect. The different minerals paragenesis and geochemistry data show that, the Bangam locality is a bauxite ore deposit in spite of a high content of iron and silicate of some facies, nevertheless, these can be used in some industries.

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de Oliveira, Saulo B., Jeff B. Boisvert, and Clayton V. Deutsch. "Application of Volume Uncertainty for Resource Classification: A Case Study on the Rondon Do Pará Bauxite Deposit, Brazil." Mining 2, no. 4 (October 6, 2022): 670–82. http://dx.doi.org/10.3390/mining2040036.

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This study illustrates the application of conditional simulations to calculate the uncertainty associated with the thickness of bauxite ores. The bauxite deposit of Rondon do Pará in northern Pará State, Brazil, is characterized by a well-defined lateritic profile, with the ore being composed of two sequential horizons: massive bauxite and ferruginous bauxite. This study used ore thickness data from 1.005 drillholes with different grid spacing. Drillhole intervals of both types of bauxite ore were accumulated, converting the database from 3D to 2D. Sequential Gaussian simulation produced probability maps calculated from certain confidence intervals, which permits obtaining the uncertainty associated with estimates in thickness. Results show that in portions with the same regular drillhole spacing there are different ranges of uncertainty and variability, which could be useful to support resource classification, associating different confidence intervals to resource classes. This analysis could also guide the drilling program for resource conversion in order to optimize costs, indicating areas where there is greater uncertainty and would need to be densified. The incorporation of this information into the resource model could be very helpful for supporting subsequent studies of economic evaluation and risk analyses with respect to this type of deposit or similarly in mineral exploration.

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Zhong, Chan Juan, De Si Sun, Hong Bao, and Hao Chen. "Comparative Characteristics and Desilicon Ability of 10 Strains of Silicate Bacteria Screened from Different Bauxite Ores." Advanced Materials Research 524-527 (May 2012): 953–56. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.953.

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Ten strains of silicate bacteria were screened from three bauxite samples in Jiangxi Province and Henan Province in China. The ten strains were determined as B. mucilaginosus according to the results of physiological and biochemical characteristics and desilicon ability. Bioleaching tests showed that the ten strains all can decompose bauxite ore and release silicon from bauxite, but had a large difference of desilicon ability among them.

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., Huma Rashid, Haq Nawaz ., and T. M. Bhatti . "Bioleaching Studies of Bauxite Ore Using Aspergillus niger." Journal of Biological Sciences 1, no. 6 (May 15, 2001): 501–4. http://dx.doi.org/10.3923/jbs.2001.501.504.

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Thevi, T., and A. L. Abas. "Effects of Bauxite and Alumina Exposure on Incidence of Cancer - Meta-analysis." Kathmandu University Medical Journal 18, no. 4 (December 31, 2020): 414–19. http://dx.doi.org/10.3126/kumj.v18i4.49256.

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Bauxite is an ore from which Aluminium is produced. Malaysia, once the leading producer of bauxite has reduced production as mining activity has caused community outrage. Due to concerns about health concerns, rising pollution and environmental hazards, the government has revoked the licenses of bauxite miners. We therefore did a meta-analysis to assess the relationship between exposure to Bauxite and Alumina with incidence of various types of cancers. Bauxite mines and alumina refineries. Individuals of all ages exposed to Bauxite and Alumina. Exposure to bauxite and alumina. Incidence due to overall cancers and specific types of cancers. Exposure to bauxite and alumina did not cause variations in incidence of overall cancer and specific types of cancer such as cancer of lip, cancer of the oral cavity and pharynx, cancer of digestive organs and others. We conclude that there is no evidence that bauxite or alumina exposure cause increase incidence of cancer but due to the small number of studies included in this review, we recommend more cohort studies to be done in future.

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Verma, Ajay S., Narendra M. Suri, and Suman Kant. "Applications of bauxite residue: A mini-review." Waste Management & Research: The Journal for a Sustainable Circular Economy 35, no. 10 (September 6, 2017): 999–1012. http://dx.doi.org/10.1177/0734242x17720290.

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Bauxite residue is the waste generated during alumina production by Bayer’s process. The amount of bauxite residue (40–50 wt%) generated depends on the quality of bauxite ore used for the processing. High alkalinity and high caustic content in bauxite residue causes environmental risk for fertile soil and ground water contamination. The caustic (NaOH) content in bauxite residue leads to human health risks, like dermal problems and irritation to eyes. Moreover, disposal of bauxite residue requires a large area; such problems can only be minimised by utilising bauxite residue effectively. For two decades, bauxite residue has been used as a binder in cement industries and filler/reinforcement for composite materials in the automobile industry. Valuable metals and oxides, like alumina (Al2O3), titanium oxide (TiO2) and iron oxide Fe2O3, were extracted from bauxite residue to reduce waste. Bauxite residue was utilised in construction and structure industries to make geopolymers. It was also used in the making of glass-ceramics and a coating material. Recently bauxite residue has been utilised to extract rare earth elements like scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), neodymium (Nd) and dysprosium (Dy). In this review article, the mineralogical characteristics of bauxite residue are summarised and current progresses on utilisation of bauxite residue in different fields of science and engineering are presented in detail.

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Li, Yan, Zhao Hui Huang, and Yan Gai Liu. "Study on Mineral Composition and Main Mineral Morphology of Bauxite from ZhongXiang, HuBei Province." Key Engineering Materials 512-515 (June 2012): 648–51. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.648.

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In this paper, the mineral composition and main mineral morphology of bauxite were studied from ZhongXiang deposit, HuBei province. Through Electron Microscope Identification, there are two main rock types, oolitic, bean-like and aphanitic or fine crystalline structure of bauxite. The main mineral morphology is micro-crystalline or flake, crumby forms. The mineral and chemical compositions of samples were investigated by XRD, EPMA analysis tests. The EPMA results showed that Al2O3 content is 47.95% ~ 75.04%, in association with other isomorphous impurities, such as Si, Fe, Ti and Mg in varying proportions. The mineral compositions of bauxite ore are mainly aluminum, iron, silicon minerals, which totally account for from 83.01% to 86.40%. The XRD revealed that diaspore, hematite and kaolinite are the major mineral components in the bauxite ores. The bauxite from ZhongXiang deposits is a type of high diaspore bauxite, partly with clay minerals. Furthermore, the function of bauxite as a good fire-resistant material was discussed.

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Cao, Xue Feng, Jian An Lu, and Run Qing Liu. "The Designation of the Collector in Aluminosilicate Minerals Flotation and the Study of its Mechanism." Advanced Materials Research 997 (August 2014): 655–59. http://dx.doi.org/10.4028/www.scientific.net/amr.997.655.

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The main gangue minerals in bauxite ore are kaolinite, illite and pyrophyllite. The bauxite reverse flotation aims to float them out. In this essay, a certain type of bauxite is taken into account to design and synthesize the N-Alkyl-1,3-diaminopropane from the perspectives of solid-philic group and nonpolar group by applying the kaolinite crystal model in Curis2 software. It also studies the function mechanism of this newly developed reagent in flotation by applying flotation solution chemical calculation, ζ-potential test and infrared spectrometry test.

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Wu, Yang, Dai Tagen, and Long Yongzhen. "The Research of the Mineralogical and Element Geochemical Characteristics of Bauxite in Yunfeng, Qingzhen, in Central Guizhou Province, China." Open Chemical Engineering Journal 9, no. 1 (October 22, 2015): 134–42. http://dx.doi.org/10.2174/1874123101509010134.

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The mineralogical and geochemical characteristics of the Yunfeng bauxite in Qingzhen were investigated through the handle specimen observation, thin section analysis, XRD、SEM and Element geochemistry. The mineral analyses reveal that diaspore, kaolinite and chlorite are the major minerals in the bauxite with small amounts of boehmite and pyrite. Geochemical investigations reveal that the main components in the bauxite are Al2O3, SiO2 and TFe2O3, the minorcomponents are TiO2, MgO and P2O5. In the process of weathering, some trace elements, such as Zr, Cr, Nb and Hf, are enriched. Zr vs Hf and Nb vs Ta display higher positive correlation. Trace elements show that Loushanguan Formation is the main source of material for the bauxite formation and there may be exist other precursor rock provide few material for the bauxite formation. Ore deposit formed in a O-poor,reducing Marine sedimentary environment.

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KASAI, Eiki, Manuse MANEENUSE, Mitsuo TANJO, and Fumio SAITO. "Removal of Iron Mineral from Bauxite Ore by HGMS." Shigen-to-Sozai 109, no. 10 (1993): 817–22. http://dx.doi.org/10.2473/shigentosozai.109.817.

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Rashid, Waleed Turki. "Optimization alkaline leaching of silicon element from bauxite ore." Al-Qadisiyah Journal for Engineering Sciences 14, no. 3 (April 7, 2022): 184–89. http://dx.doi.org/10.30772/qjes.v14i3.778.

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This research examines the effect of alkaline leaching on the recovery of silicon element from the Iraqi Bauxite Ore. The factors studied were NaOH concentration, particle size, and stirring speed using the program MINITAB 16. NaOH concentration (X1) (1,2, and 4M), particle size (X2) (53,75,and 150µm), and stirring speed (X3) (250,500, and 750 rpm). The best recovery percentage was found to be (94.1097) when the variables were (X2= 53M), (X1 = 4M), and (X3=750 rpm). The factors NaOH concentration (X1), particle size (X2), and stirring speed (X3) all have a substantial impact on the process of recovery, according to the results. However, NaOH Concentration (X1) and Particle’s size (X2) have a more significant effect compared with the stirring speed (X3) on the recovery process.

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Zhao, Bo, Yanxin Chen, and Shaowu Jiu. "Effective Desulfurization and Alumina Digestion of High-Sulfur Bauxite by New Roasting Process with Conveying Bed." Processes 9, no. 2 (February 20, 2021): 390. http://dx.doi.org/10.3390/pr9020390.

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A new roasting process with a conveying bed was constructed and used to remove sulfur of high-sulfur bauxite. Roasting temperature, phase transformation, microcrystal, specific surface area of high-sulfur bauxite, and the mechanism of the reaction during the roasting process were analyzed. The digestion properties of roasted bauxite were also investigated. The results showed that the sulfur in high-sulfur bauxite can be efficiently removed by roasting in the conveying bed at 520–720 °C for 2 s. Major reactions of high-sulfur bauxite during roasting were the dehydration of minerals, desulfurization of pyrite, sulfation of SO2, and decomposition of sulfate. The rate of mineral dehydration reaction was significantly slower than that of the desulfurization reaction. The specific surface area of roasted ore greatly increased, and the microcrystal of Al-O mineral was refined, which was conducive to Al2O3 digestion. The mass fraction of sulfide sulfur in high-sulfur bauxite was reduced from 1.20% to 0.01%, and the relative digestibility of alumina reached more than 99% when roasting at 600 °C for 2 s. This paper provides revelations and instructions for the process development and application of high-sulfur bauxite.

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Cui, Tao. "Mass Change Calculation of the Bauxite in the WZD Area, Northern Guizhou, China." Advanced Materials Research 868 (December 2013): 80–83. http://dx.doi.org/10.4028/www.scientific.net/amr.868.80.

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Through mass change calculation of the bauxite in the Wuchuan-Zheng, an-Daozhen (WZD) area to reveal the migration regular of elements in the ore-forming process: major elements all have loss except aluminum element which keep steady in the ore-forming process of the WZD bauxite deposit; Major elements in the upper and middle part of the profile have a large scale of runoff, in the lower part of the profile just have a small scale of runoff, and some elements concentrated in the lower part of the profile, above all of these shows that major elements have a downward moving trend. Alkaline metal have the largest scale of runoff demonstrated that the ore-forming environment is acidic.

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Zhang, Pengyu, Saizhen Jin, Leming Ou, Wencai Zhang, and Yuteng Zhu. "Fine Bauxite Recovery Using a Plate-Packed Flotation Column." Metals 10, no. 9 (September 2, 2020): 1184. http://dx.doi.org/10.3390/met10091184.

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In this investigation, the fine-grained bauxite ore flotation was conducted in a plate-packed flotation column. This paper evaluated the effects of packing-plates on recovering fine bauxite particles and revealed the fundamental mechanisms. Bubble coalescence and break-up behaviors in the packed and unpacked flotation columns were characterized by combining Computational Fluid Dynamics (CFD) and Population Balance Model (PBM) techniques. Flotation experiments showed that packing-plates in the collection zone of a column can improve bauxite flotation performance and increase the smaller bauxite particles recovery. Using packing-plates, the recovery of Al2O3 increased by 2.11%, and the grade of Al2O3 increased by 1.85%. The fraction of −20 μm mineral particles in concentrate increased from 47.31% to 54.79%. CFD simulation results indicated that the packing-plates optimized the bubble distribution characteristics and increased the proportion of microbubbles in the flotation column, which contributed to improving the capture probability of fine bauxite particles.

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Jiang, Ya Xiong, Hai Yun Xie, Li Juan Huang, and Shu Ming He. "A Novel Technology Study of Separation Silicon from a High Silicon Bauxite by Direct Flotation." Advanced Materials Research 524-527 (May 2012): 924–29. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.924.

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Abundant of bauxite in China couldn’t be used to process alumina with Bayer process due to it is contain the high silicon. Many of low-grade bauxite have not been fully utilized, and caused many waste of resources. So the bauxite flotation to desilicication of low-grade bauxite will have a very important significance for China's aluminum industry. This paper reports an innovative development: the separation of silicon from bauxite with two stages by the stage grinding and stage flotation via the direct flotation, and obtained the high quality bauxite concentrate, the flotation index is favorable. The raw ore contains Al2O3 60.78%, SiO2 20.84%, the Al2O3 to SiO2 mass ratio (A/S) is 2.92, the main gangue minerals are kaolinite, quartz, pyrophyllites etc. Through the first flotation by the coarse grinding and separation a part of the silicon, then the rough concentrate for the secondary flotation after the regrinding and separation other part of the silicon, obtained the qualified concentrate. The rough concentrate via the five times clean flotation after regrinding. The closed-circuit test obtained the indexes with the concentrate contains Al2O3 70.23%, SiO2 8.65%, the A/S is 8.12, the recovery of Al2O3 is 72.49%. This process can reduce the pollution of gangue minerals to bauxite at the condition of fine grinding, prevent over crush of bauxite, and reduce the impact of experiment of flotation by slime.

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Gao, Chang He, Jia Lin Sun, Yong Li, Jun Jie Zhang, Ji Li Zhang, and Shu Long Liu. "Investigation on the Sintering Properties of Mullite Al₂O₃-70%." Advanced Materials Research 941-944 (June 2014): 2620–25. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2620.

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This paper takes Al2O3-70% natural mullite raw bauxite ore (Referred to 70-ore) and Al2O3-70% bauxite based homogenized grogs green adobe (Referred to 70-grog), produced by Beijing Tongda Refractory Technologies Co.,Ltd.through wet homogenization and vacuum pug process, as raw materials. 70-ore and 70-grog are fired respectively at 1100°C, 1300°C, 1400°C, 1600°C for 4 hours. Research on the influence of sintering temperature on the phase compositin, microstructure and bulk density. Analysis on the phase reaction during the sintering process. The results show that: Phase distribution of 70-ore is uneven. α-Al2O3 decomposed by diaspore is difficult to contact with amorphous SiO2 decomposed by kaolinite, this makes α-Al2O3 particle be unable to dissolve into amorphous SiO2, and causes twice crystallizing of mullite reaction hardly to happen. After a series of homogenizing treament, diasepore and kaolinite phase of 70-grog distribute more uniformly, which don’t destory the ore structure, and accelerate the twice crystallizing of mullite reaction. Compared with 70-ore, the twice crystallizing of mullite reaction extent of 70-gorg is more thoroughly. Rising the sintering temperature is beneficial for the twice crystallizing of mullite reaction, the growth of mullite and the bulk density of mateials. The adobes produced through wet homogenization and vacuum pug process have a big volume shrinkage, so controlling the removal of crystal water,the formation and growth of mullite are the keys to get dense bauxite based homogenized grogs.

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Mertzanis, A., G. Karetsos, V. Smyrni, G. Efthimiou, and G. Zakinthinos. "National Park of Iti: Environmental and geomorphological impacts from the mining activity (Greece)." Bulletin of the Geological Society of Greece 40, no. 4 (January 1, 2007): 1833. http://dx.doi.org/10.12681/bgsg.17144.

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Bauxite excavation and the inert material quarries, in the wider region of the "National Park of Iti" in combination with the forest fires, the illegal logging, the grazing and the uncontrollable waste disposal, constituted the most important pressures in it's natural ecosystems. Particularly, bauxite ore exploitation that presented elation during the decade of '70s, was implemented without planning and it caused alterations in the natural environment of the region mainly by the continuous excavations, the foreheads of galleries and the extensive depositions of aggregates materials. As a result, all the above led to the occupation or the deforestation of forests and woodlands, the interruption of natural relief continuity and the change of natural géomorphologie processes. The aim of this work, concerns the determination of the impacts to the environment and more specifically the geomorphes and geomorphological processes, by the bauxite ore exploitation and the quarrying activity, that was developed in the wider region of the "National Park of Iti".

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Yang, Wu, Min Zhang, Cui Tao, and Jun Yan. "Comprehensive Utilization and Sustainable Development of Bauxite in Northern Guizhou on a Background of Carbon Neutralization." Sustainability 14, no. 21 (November 1, 2022): 14301. http://dx.doi.org/10.3390/su142114301.

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As a developing country, China is also a major producer and consumer of mineral resources. At present, China is still in a critical period of rapid development of industrialization and urbanization, which will inevitably lead to huge resource consumption. It is only 30 years between the peak carbon consumption and the timepoint planned to achieve the goal of carbon neutrality. Coming from a background of dual pressure in terms of the total amount and intensity of “carbon neutrality”, the development and utilization of mineral resources has become one of the important factors in affecting and realizing carbon neutrality in China, and comprehensive utilization has become increasingly important. There are abundant bauxite resources in northern Guizhou, more than 700 million tons, and an industrial resource chain could be built around bauxite. The ore-forming process of bauxite is very complex, and there are enrichment phenomena of other useful elements in the ore-bearing rock series, among which the enrichment of associated Ga, Li and rare earth elements is very obvious. It is of great economic and scientific significance to study the migration law of associated Ga, Li and rare earth elements and to find out whether these elements in bauxite have development value. On the basis of systematically collecting and sorting previous research results, this study carried out supplementary tests on some areas with insufficient data; summarized and studied the migration law of associated Ga, Li and rare earth elements in the Wuzhengdao bauxite deposit in northern Guizhou; and conducted a feasibility analysis on the development and utilization prospects of associated Ga, Li and rare earth elements.

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Aleksey, Kholmskii. "The prospects of blastless ore breaking with hydraulic hammers when mining North Uralian Bauxite Mine deposits by underground method." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, no. 4 (August 21, 2022): 26–37. http://dx.doi.org/10.21440/0536-1028-2022-4-26-37.

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Research objective is to increase mining productivity at the North Uralian Bauxite Basin deposits by switching to blastless mining technology with ore breaking with hydraulic hammers. Methods of research include the analysis of current process flow schemes for the North Uralian bauxite basin deposits development, a comparative analysis of the stoping schedules in process flow schemes with drilling and blasting ore breaking and blastless breaking of the mine block reserves, determining the productivity of blastless ore breaking with hydraulic hammers, and studying the dependence between the process flow scheme efficiency and the depth of mining. Results. Stoping cyclograms in process flow schemes with ore drilling and blasting and mechanical breaking were compared for the conditions of the North Uralian Bauxite Mine (SUBR) deposits development. The dependence between the process flow schemes efficiency and the depth of mining has been established. Based on the comparative analysis results, it was determined that the process flow scheme for blastless mining at SUBR deposits is the most competitive in terms of stoping productivity and safety. The developed process flow scheme with ore breaking with hydraulic hammers provides a minimum drop in process flow scheme efficiency with an increase in the depth of mining and an increase in productivity by 1.5–2 times due to the implementation of a cyclic-flow technology for stoping. Conclusions and scope of the results. The developed process flow scheme for blastless mining at SUBR deposits with ore breaking with hydraulic hammers makes it possible to increase the productivity of stoping by 1.5–2 times without reducing the level of safety. The research results can be used to justify the switch to a blastless mining in complicated mining and geological conditions, in conditions of increased rock-bump hazard, and when stoping ground advances to deep horizons.

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Kong, Yue. "Sedimentary Facies Feature and its Ore-Controlling Role of Middle Permain Liangshan Formation, Southeast District of Guizhou Province." Applied Mechanics and Materials 651-653 (September 2014): 1255–59. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.1255.

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The bauxite deposits in the study area belongs to the monohydrate bauxite deposit that were located the eroded surface of carbonate rocks, and the host country rock is the Middle—Permian Liangshan formation strata. In order to understand the development situation of the sedimentary facies of Liangshan formation in different periods and in different regions in the study area as well as the evolutionary process,the authors selected four strata profiles for the comparative analysis from the drilling records.The result indicated that there were two stages of transgression and a stage of marine regression in the study area during the ore—forming period,and the sea water transgressed into the NE part from the SW direction.The paleogeographic frame work played an important role in the deposition of the ore—forming materials,deposit preservation and the secondary enrichment.

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34

Negrão, Leonardo Boiadeiro Ayres, Marcondes Lima da Costa, Herbert Pöllmann, and Axel Horn. "An application of the Rietveld refinement method to the mineralogy of a bauxite-bearing regolith in the Lower Amazon." Mineralogical Magazine 82, no. 2 (February 28, 2018): 413–31. http://dx.doi.org/10.1180/minmag.2017.081.056.

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AbstractA comparison of Rietveld refinement results for a bauxite-bearing regolith and its clayey cover in the Amazon region was made with stoichiometric calculations from chemical analysis and partly from thermogravimetric results. For this investigation a profile in the bauxite-bearing regolith occurrence in the ALCOA bauxite mine at Juruti, Brazil was studied. The different minerals, their compositions and their low crystallinity in the different horizons were investigated and the contents determined. It is evident that some minerals show several generations and some chemical composition changes that must be included in the Rietveld refinement. Al-rich hematites and goethites are common along the bauxite profile. Amorphous contents were determined with rutile added as an internal standard and shown to have gibbsite- or kaolinite-like composition. The minerals could be quantified in the different horizons and the difficulties were mainly related to variable crystalline aspects of the phases. Rietveld refinement can be a powerful tool in bauxite prospecting, quality control and during mining and beneficiation of ore minerals using the adapted refinement strategies.

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Mergen, A. "Production of sintered high alumina refractories from Turkish bauxite ore." British Ceramic Transactions 103, no. 1 (February 2004): 42–46. http://dx.doi.org/10.1179/096797804225012675.

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36

Moeez, Sana, Ejaz Ahmad Siddiqui, and Absar Ahmad. "Nanoalumina Bioleaching from Bauxite Ore by Humicola sp." Advanced Science, Engineering and Medicine 8, no. 4 (April 1, 2016): 298–305. http://dx.doi.org/10.1166/asem.2016.1853.

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Rao, D. S., and B. Das. "Characterization and Beneficiation Studies of a Low Grade Bauxite Ore." Journal of The Institution of Engineers (India): Series D 95, no. 2 (August 19, 2014): 81–93. http://dx.doi.org/10.1007/s40033-014-0050-8.

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Ahmad, I., E. U. Hartge, J. Werther, and R. Wischnewski. "Ultrasonic processing of bauxite ore to estimate its washing potential." Journal of Mining Science 52, no. 1 (January 2016): 201–6. http://dx.doi.org/10.1134/s1062739116010321.

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Kim, Yeongkyoo. "Occurrence of Nickel in Bauxite Ore from Samar Island, Philippines." Journal of the Mineralogical Society of Korea 26, no. 4 (December 31, 2013): 313–18. http://dx.doi.org/10.9727/jmsk.2013.26.4.313.

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Cherukumilli, Katya, Max Steiner, and Jessica R. Ray. "Effective fluoride removal using granular bauxite filter media as an affordable and sustainable alternative to activated alumina." Environmental Science: Water Research & Technology 7, no. 8 (2021): 1465–79. http://dx.doi.org/10.1039/d1ew00033k.

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41

Ma, D., M. Guo, and M. Zhang. "Preparation of polymeric aluminium ferric chloride from bauxite tailings." Journal of Mining and Metallurgy, Section B: Metallurgy 49, no. 2 (2013): 225–31. http://dx.doi.org/10.2298/jmmb120815007m.

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Bauxite tailings are the main solid wastes in the ore dressing process. The Al2O3 and Fe2O3 contents in bauxite tailings can reach 50% and 13% respectively. The present study proposed a feasible method to use bauxite tailings to prepare polymeric aluminium ferric chloride (PAFC), a new composite inorganic polymer for water purification. Bauxite tailings roasted reacting with hydrochloric acid under air, pickle liquor which mainly contains Fe3+, Al3+ was generated, then calcium aluminate was used to adjust pH value and the basicity of the pickle liquor, the PAFC was subsequently prepared after the polymerization process. The optimal synthesizing parameters for the preparation of PAFC obtained were as follows: the concentration of hydrochloric acid of 24 wt%, ratio of hydrochloric acid to bauxite tailings of 6:1, temperature of 90?C, leaching time of 2.5 hours, ration of pickle liquor to calcium aluminate of 12:1, polymerization temperature of 90?C and polymerization time of about 3 hours. The basicity of PAFC was higher than 68%, the sum concentration of Al2O3 and Fe2O3 was beyond 12.5%. The results of flocculation tests indicate that the PAFC has a better performance of removing the turbidity of wastewater compared to PAC, and PAFC prepared by bauxite tailings is a kind of high quality flocculants.

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Han, Jun, Bo Lin Wu, and Shao Peng Wu. "A Method of Preparing Grinding Medium of White and High Performances Using Natural Bauxite Ore." Materials Science Forum 620-622 (April 2009): 113–16. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.113.

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This text contrapose on the contradiction between price of alumina powder material and performance of alumina ceramic manufacture at present. Abundant natural bauxite mineral in China as main raw materials was used through the favorable craft course and a small amount of other auxiliary additive to produce grinding medium which have the character of color white, higher performances, lower sintered temperature, fewer consume of resources, cheaper production cost, etc. And the problem of producing high-level grinding medium only using expensive industrial alumina powder was solved and pollution in production of alumina powder was avoided. So the environmental pollution and energy consuming can be reduced and high added value of bauxite can be achieved through this method. The experimental design continued to use the industrial production route and apt to realize industrialization, once it is put into production, enormous social effect will be achieved.

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43

Manivasakan, P., V. Rajendran, P. R. Rauta, B. B. Sahu, and B. K. Panda. "Direct Synthesis of Nano Alumina from Natural Bauxite." Advanced Materials Research 67 (April 2009): 143–48. http://dx.doi.org/10.4028/www.scientific.net/amr.67.143.

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The nano alumina have been synthesised employing a novel eco-friendly route from natural bauxite ore. The synthesis of alumina powder from natural bauxite is of great interest owing to the fact that it enables mass production without the use of expensive chemical resources and processing techniques. Employing the Bayer process, synthesis of nano alumina has been made from natural bauxite followed by sol-gel route. The ultra fine alumina powder with high surface area is obtained through the digestion of gel followed by sintering. The size of the particle and its morphology was controlled by calcination temperature and processing time. The crystallite size of the nano alumina powder has been measured using XRD pattern and the FTIR spectrum of nano powder after calcination at different temperatures (873 K and 1273 K) were measured. The results from the energy dispersive X-ray analysis (EDAX) and morphological studies reveal interesting informations. The observed results indicate that one can control the particle size by controlling the aging and calcination temperature. The obtained results indicate that the above process technique is an unique method for the preparation of nano alumina (Al2O3) from natural source such as bauxite.

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Petrakis, Evangelos, Georgios Bartzas, and Konstantinos Komnitsas. "Grinding Behavior and Potential Beneficiation Options of Bauxite Ores." Minerals 10, no. 4 (March 31, 2020): 314. http://dx.doi.org/10.3390/min10040314.

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This laboratory study investigates selective grinding and beneficiation options for a Greek bauxite ore. First, a series of batch grinding tests were carried out in order to investigate the grinding behavior of the ore and the effect of the material filling volume (fc) on the distribution of aluminium- and iron-containing phases. Then, the ground ore was subjected to magnetic separation either as received or after reduction roasting in order to further explore potential beneficiation options. The results showed that grinding of the ore exhibits non-first order behavior, while the breakage rate varies with grinding time. Additionally, Al2O3 tends to concentrate in the coarser than 0.300 mm product fraction, while fc 10% and 2 min of grinding time are considered optimum conditions for good distribution of Al2O3 and Fe2O3. When different product fractions were subjected to magnetic separation, it was seen that the non-magnetic product obtained from the 0.300–1.18 mm fraction was more rich in Al2O3. In this fraction, the Al2O3 content increased from 58 wt% in the feed to 67.9 wt%, whereas the Fe2O3 content decreased from 22.4 wt% in the feed to 13.5 wt%. When the ore was subjected to a two-step treatment, involving reduction roasting followed by magnetic separation, the Fe2O3 grade decreased from 20.8 to 5.1 wt%, but in this case the recovery was very low.

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Ridho, Muhammad, and Peter Eka Rosadi. "Penanganan Kolam Sedimentasi Hasil Pencucian Bauksit Di PT. ANTAM Tbk. Tayan." Jurnal Mineral, Energi dan Lingkungan 2, no. 2 (February 11, 2019): 87. http://dx.doi.org/10.31315/jmel.v2i2.2157.

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Bauxite ore mining PT.Antam Tbk. located in Tayan Hilir Subdistrict, Sanggau Regency, West Kalimantan Province is an open pit backfilling system. Besides the bauxite ore extraction, the washing process resulted slurry which is entering the open channel towards the sedimentation pond. This study aims to determine the total discharge of slurry that will enter the sedimentation pond and assess the capacity of existing sedimentation ponds. The results showed that based on the production target of 700,000 tons of Bauxite Washed/year with 60% concretion factor data, the total discharge of water entering the sedimentation pond was 3.54 m3/sec. The slurry from the open channel will go into the sedimentation pond so that the deposition found in Segment I, IV, V, and VI was 409.06 m3/day, 254.59 m3/day, 561.35 m3/day, and 273.90 m3/day respectivelly. Intensive dredging material will be carried out using two Hitachi Zaxis 210 LC Long-Arm Excavator units. The cleaning time needed by Segment I, IV, V, and VI are 10 days, 6 days, 9 days and 5 days, so that the dredging time of Segment I, IV, V, and VI are 82 days, 65 days, 53 days and 62 days respectivelly

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46

Chen, Xiao Qing, Jin Zhong Yang, Yi Lin Mao, and Wei Ping Yan. "Study on Exploiting and Utilizing Technology of Certain Middle-and-Low-Grade Bauxite." Advanced Materials Research 734-737 (August 2013): 982–88. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.982.

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Taking a middle and low grade bauxite sample in Chongqing as the research object, the processing experiment research separated and enriched the low-grade raw ore to provide higher grade raw material for alumina production, which consequently ascertain proper processing technology solutions, increases concentrate grade and recovery, and provides technological basis for the development and utilization of bauxite resources in the district. The experiment recommends the process of "selective grinding grading of coarse and fine particle - direct flotation", and the technological indexes of closed circuit flow test are A/S 8.23 and recovery 91.42%.

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Zhang, Xiao Lin, Jian Jun Fang, and Dian Wen Liu. "Application of Intensifying Secondary Concentration Technology in Reverse Flotation of Bauxite." Applied Mechanics and Materials 161 (March 2012): 6–10. http://dx.doi.org/10.4028/www.scientific.net/amm.161.6.

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In order to resolve the problem of fine particle flotation in the reverse flotation of bauxite. a new method of intensifying secondary concentration technology was firstly advanced, and author applied it to ore, achieved eximious experimentation index. The reverse flotation tests of intensifying secondary concentration aiming at bauxite from Guizhou province were studied. The results show that diaspore concentrate directly used in the Bayer-mineral processing method can be obtained by using the intensifying secondary concentration technology without pre—desliming. The average A/S of the concentrate is 10.28 with a recovery rate of 85.41%.

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MA, Shao-wei, Jian-hua HU, Ya-guang QIN, Qi-fan REN, and Dong-jie YANG. "Bearing mechanism and thickness optimization of ore roof in bauxite stope." Transactions of Nonferrous Metals Society of China 32, no. 1 (January 2022): 285–95. http://dx.doi.org/10.1016/s1003-6326(22)65794-7.

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Sun, Yong Qiang, Yong Li, Shuo Cao, Hao Bo Zhang, Chang He Gao, and Ji Li Zhang. "Research on High Temperature Creep Properties of Al₂O₃-SiO₂ Ore (Al₂O₃ ~ 65)." Key Engineering Materials 680 (February 2016): 343–46. http://dx.doi.org/10.4028/www.scientific.net/kem.680.343.

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High temperature creep properties of Al2O3-SiO2 ore (65% Al2O3 by mass percentage, abbreviation for Al2O3~65) was studied. The results show that the creep rates at 1300 °C × 50h, 1400 °C × 50h and 1500 °C × 50h were-0.89% ,- 1.75%, - 5.76%,respectively. At 1300 °C, ore has good creep resistance. As the temperature increases, the high temperature creep resistance of Al2O3 ~ 65 bauxite ore is significantly reduced. Creep process can be divided into two stages: when the time t <30h, the sample are in the densification process; after 30 hours, the creep properties show that the relationship between time and the creep rate is linear. At 1300 °C, the absolute value which is the slope of the linear relationship is smaller, exhibited an excellent high-temperature creep resistance. The loading softening-temperature of Al2O3 ~ 65 bauxite ore is 1343 °C. The Sample phase and microstructure are characterized by X-ray diffraction and scanning electron microscopy (SEM). The results show that mullite reticular is formed in sample at 1300 °C; at this point, TiO2 mostly exist as Rutile. At 1400 °C and 1500 °C, TiO2 mostly exist as Aluminum titanate, Corundum phase portion into mullite.

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Wang, Song, Jia Ping Zheng, Xiao Pei Zhang, and Shun Ran Wang. "Discussion on the Types Attribution and Comprehensive Utilization of High-Alumina Clay Ore." Advanced Materials Research 807-809 (September 2013): 2209–14. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.2209.

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High-Alumina clay ore is the protective exploitation of mineral stipulated by the Ministry of Land and Resources. Due to its physicochemical properties and ore characteristics are quite different from current ore types --refractory clay mineral. It is usually taken as a general refractory clay mine of high-Alumina clay in practical applications, which leads to massive misuse and great waste of high-Alumina clay ore. This paper will redefine the attribuation of high-Alumina clay ore by analysing its differences and similarities with refractory clay minerals and bauxite mines in mineralogy, rock chemistry as well as physical structure, and present some advice on its comprehensive usage aiming at the existed problems in comprehensive development and utilization.

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Journal articles on the topic 'Bauxite ore'

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