Bauxite Mining, Refining, Alumina Britannica
Bauxite, rock largely composed of a mixture of hydrous aluminum oxides. Bauxite is the principal ore of aluminum. Bauxites vary French chemist, Pierre Berthier while working near Les Baux in southern France in 1821, discovered soil with high quantities of aluminium oxide (or alumina) and named it bauxite after the village (Davis ). The material was deemed a potential source of aluminium; however, a very high electric current was needed to isolate the metal.The Bauxite Industry and Its Development SpringerLink
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Bauxite an overview ScienceDirect Topics
The principal uses of bauxite are multipurpose covering metallurgy, chemical industries, as raw material in building and road aggregates. Bauxite is the best and only material for making aluminum metal. Bauxite is used in chemical industry, refractory brocks, abrasive, cement, steel, and petroleum.This paper presents a semi-systematic, in-depth review of peer-reviewed scientific publications within the topic of social impacts of bauxite mining and refining ( Snyder, 2019 ). The review aims to provide an overview of the field based on peer-reviewed scientific publications encompassing both a quantitative component, including a historicalSocial impacts of bauxite mining and refining: A review
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Metals Free Full-Text From Bauxite as a Critical Material to
There is a long process to transform bauxite, a critical raw material, into a substance with the required properties of cast aluminum alloys for use in electro automotive parts. Thanks to its unique properties, aluminum has become the material of choice for clean technology manufacturers in applications such as use in the automotive industry, 3. Iron-rich bauxite processing and metallurgy. Iron-rich bauxite ore usually contains over 40 wt% iron oxide [11, 12], huge reserves are found in Australia, Guinea, Brazil, Laos, Vietnam and China, but they Aluminum Mineral Processing and Metallurgy:
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On the geology, mineralogy and geochemistry of the bauxite
, Herbert Poellmann 3 Add to Mendeley https://doi/10.1016/j.gexplo.2014.07.021 Get rights and content • A typical lateritic regolith with world class bauxite deposits is examined. • Thick yellow clay conceals the bauxite ore body, typical in Amazon. • The trace element geochemistry is controlled by Discovery of the REE minerals and its geological significance in the Quyang bauxite deposit, West Guangxi, China. Journal of Asian Earth Sciences 39,701–712 (2010). Article ADS Google ScholarInteraction between karst terrain and bauxites:
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Bauxite Consumption to Reach 445 Million Tons by 2030,
The global bauxite market is projected to reach US$ 21.3 billion by 2030, at a CAGR of 2.2%. Production of bauxite is concentrated in a few countries, with Australia, China, and Guinea being theBauxite residue has been revealed as a very good industrial waste for adsorption and catalytic processes involving cleansing of gaseous pollutants released from emission/exhausts of different systems (Mishra et al., 2021). This review includes a critical analysis of the red mud production, its usage in the removal of various gases andA review on bauxite residue usage in air pollution control
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Light Metals 2012 SpringerLink
Characterization of Bauxite and its Minerals by Means of Thermoanalytical Methods. Haiyan Yu, Bo Wang, Shuang Zhang, Ganfeng Tu, Shiwen Bi; Pages 39-43. Effect of chamosite on Bayer process of special diasporic bauxite with high silica to basic research and the advanced applications of materials. Included among its nearly 13,000Bauxite produces 60-120 million tons of toxic red mud annually during its processing to alumina. Thus, in this work, the modeling of the bauxite processing process to reduce quantity of red mud produced Decreasing Yield and Alumina Content of Red
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Political Histories of Vietnamese Bauxite SpringerLink
The world’s 55–75 billion tons of bauxite are mainly found across the tropical regions of Africa (32%), Oceania (23%), South America and the Caribbean (21%) and Asia (18%) (The Aluminum Association, Bauxite, n.d.). The world’s main producers of bauxite are Australia, China, Brazil, India, and Guinea. In contrast, the top ten producers Bauxite is a reddish-brown clay-like deposit containing iron, silicates and aluminium oxides, the latter comprising the largest constituents. At present, bauxite is so plentiful that only deposits containing a content of aluminium oxides greater than 45% are selected to manufacture aluminium.Bauxite an overview ScienceDirect Topics
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The effect of various additives on Bayer digestion of diasporic bauxite
@article{osti_371933, title = {The effect of various additives on Bayer digestion of diasporic bauxite}, author = {Lunhe, Zhang and Qili, Xu and Xiangli, Wang}, abstractNote = {In this paper, the effect of about ten kinds of additives on Bayer digestion of diasporic bauxite has been investigated. The experiment results has showed that mineral At present, high sulfur bauxite is gradually being used in the production of alumina industry to address the shortage of bauxite resources in China. However, sulfur-containing minerals in bauxite can cause iron pollution in the digestion system, corrode steel facilities, increase caustic consumption, and affect the quality of alumina products. From Characterization of High Sulfur Bauxite and Its Phase
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Metals Free Full-Text Leaching Behavior of Lithium-Bearing Bauxite
Lithium is one of the secondary mineral elements occurring in bauxite. The behavior of lithium-bearing bauxite in the digestion process was investigated, and the effect of digestion conditions on the extraction rates of lithium was studied. The results demonstrate that the mass ratio of the added CaO to bauxite, the KOH concentration, 1. Introduction. Karstic-type bauxite, which is defined within the bedrock as carbonate (Bárdossy, 1982, Calagari and Abedini, 2007, Deng et al., 2010), is widely distributed in the North China Block (NCB).The western Henan in the NCB contains approximately 1 billion tons of bauxite ore.Its geological, mineralogical, and geochemical Genesis of the Guangou karstic bauxite deposit in
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Genesis of the Permian karstic Pingguo bauxite deposit
The majority of bauxites in China (∼95%) are karstic and widely spread within the southwestern South China Block (SCB) and the North China Craton (Deng et al. 2010; Liu et al. 2010, 2013; Wang et al. 2011, 2012).The western Guangxi area of the southwestern SCB hosts bauxite resources more than 0.5 billion tons, which include to bauxite. Further uses for the residues as building material must be more evaluated from the radiological point of view, due to its potencial of radiological exposal enhancement, specially caused by radon emission. 1. of 214 Bi and 212 Pb, respectively, because the ageing time of at least thirty days after sealingRADIONUCLIDES IN BAYER PROCESS RESIDUES:
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Review of Zinc in Bauxites, the Bayer Process, Alumina
Scavnicar reported [7] among other constituents, the Zn content of 47 karst bauxite samples from Herzegovina. The ZnO content was found to be 0.012-0.025 % in 42 samples while it was 0.037 % in four bauxite samples, and 0.05 % in one. Logomerac reported [8] that the bauxite at Titograd (now Podgorica, Montenegro) contained 0.035 % Abstract. Bayer digestion performance of gibbsite-boehmite bauxite is studied in this paper. The chemical and mineral compositions of a gibbsite-boehmite bauxite from Australia are analyzed and tested by XRF, XRD, and SEM. Test results show that the bauxite contains ≥ 50% of alumina (gibbsite and boehmite) and 9% of silica (kaolinite and Digestion Efficiency Improvement of Gibbsite-Boehmite Bauxite
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Bauxite an overview ScienceDirect Topics
Mineral, Petroleum and Coal Deposits. Charles S Hutchison, in Geology of North-West Borneo, 2005. VIII.5.2 Bukit Gebong. Bauxite has been formed from gabbro on the steep-sided Bukit Gebong (334 m). The deposit was estimated to contain a mineable 1.5 Mt of washed bauxite with an average composition of 49.4% alumina (Wolfenden and Haile, In the bauxite digestion experiments, 100 mL of the sodium aluminate solution (N k = 214 g/L; α k = 2.90) was pipetted into a homogeneous reactor (Fig. 2 (a)), and quantitative amounts of bauxite and lime were added. The amount of lime was 2% of the total mass of bauxite. The digestion temperatures were 230 °C, 240 °C, and 250 °C.Reaction behavior of quartz in gibbsite-boehmite bauxite in
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Economics of Smelter Grade Alumina Projects SpringerLink
The development of a potential bauxite project aiming at selling its bauxite to a third party would require applying the same resource quality criteria as those outlined in Table 14.17. However, in view of the fact that the bauxite will be sold, an important success factor will be refinery feed bauxite quality and—related to that—its impactelements during bauxite formation and epigenesis have been studied on specimens from the Devonian Schugorsk bauxite deposit, Timan, Russia. Chemical analyses of the minerals were obtained by electron(PDF) Mineralogy and geochemistry of trace elements in
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Mechanical Activation of Gibbsite and Boehmite: New
Almost the entire metallurgical grade alumina is produced from bauxite using the Bayer process. The leaching conditions in Bayer process depend on various Al-oxyhydroxide minerals/phases present in the bauxite. Among the various bauxite types, gibbsitic (trihydrate) bauxite is easiest to digest. Monohydrate (boehmitic and diasporic) During the Bayer process for alumina production, the molecular formula of the bauxite residue is approximately equivalent to Na 2 OAl 2 O 3 1.7SiO 2 nH 2 O. This means that 1 kg of SiO 2 in bauxite will produce 1 kg of Al 2 O 3 and 0.608 kg of Na 2 O in bauxite residue. Thus, the extraction efficiency of alumina is low when processing low Mineral transformation in treating low-grade bauxite using
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Phase transformation processes in karst-type bauxite deposit
Here we characterize the bauxite deposit in Yunnan area, China, through mineralogical and textural characteristics using XRD, SEM-EDX, and micro-Raman analyses. The Al-oxyhydroxide polymorphs (AlO (OH)) such as diaspore and boehmite are the dominant phases in most of the samples. Gibbsite (Al (OH) 3) is the main mineral in
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