It is generally produced from bauxites through the Bayer process. Several organic compounds such as humic matters and oxalates are introduced into the Bayer liquor during the digestion process, resulting in significant hazards to precipitation of aluminum hydroxide.
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During this process, mobile elements such as Ca, Mg, Na and K are preferentially dissolved and leached from the source rocks, resulting in the accumulation of relatively immobile elements such as Al, Ti, Zr, Hf, Nb, Ta and REE in karst cavities of bauxite deposits (MacLean et al., 1997; Mameli et al., 2007).
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Chemical analyses of the rocks in the laterite profiles indicate that silica, bases from the Deccan Trap basalts were selectively removed during the weathering, resulting in the concentration of...
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This leaching process produces alumina to ferruginous/bauxite residue at ratios of 1:1 to 1:4 with the end result being billions of tons of bauxite residue waste (4 billion tons worldwide by this ...
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Geology, geochemistry, and genesis of REY minerals of the late Cretaceous karst bauxite deposits, Zagros Simply Folded Belt, SW Iran: Constraints on the oreforming process Article May 2022
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Mineral genesis and oreforming process. Three stages of bauxite formation are recognized based on the mineralogy of studied samples: (1) weathering of regional sedimentary strata; (2) bauxite deposition; (3) second exposure of previously deposited bauxite caused by paleouplift.
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Geology, geochemistry, and genesis of REY minerals of the late Cretaceous karst bauxite deposits, Zagros Simply Folded Belt, SW Iran: Constraints on the oreforming process F. Ahmadnejad G. Mongelli Geology
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This provides us a precious chance to explore the genesis of bauxite formed in an intracontinental setting without impact of simultaneous orogenesis in the marginal areas. ... in the Yuxi karstic bauxite deposit within CYB were conducted to explore the formation environment and metallogenic process of Early Permian bauxite. Profile A in the ...
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We conducted geological, mineralogical, δ 34 S pyrite, and insitu diaspore trace element analyses on the BaodeXingxian large bauxite deposit in the northern NCC, aiming to clarify the diasporeforming mechanism and explore the genesis of bauxite. Generally, bauxites in northern NCC contains three layers from bottom to top: Febearing ...
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Here we characterize the bauxite deposit in Yunnan area, China, through mineralogical and textural characteristics using XRD, SEMEDX, and microRaman analyses. The Aloxyhydroxide 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 two samples from ...
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However, the genesis of many bauxite occurrences remains insufficiently explained and untouched by modern models and techniques. The karst bauxite of the Unterlaussa mining district represents the most significant occurrence in Austria and is a prominent member of the European karst bauxites.
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Bauxite residue (red mud), an alkaline, saline bauxite processing waste, is mainly produced by the Bayer process in which alumina is extracted from bauxite (Xue et al. 2015).The global inventory of bauxite residue reached an estimated billion tons in 2014 and is predicted to increase by 120 million tons per annum (Klauber et al. 2011).Globally, China is one of the largest producers of ...
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Mineralogy, geochemistry, and genesis of lateritic bauxite deposits in the WuchuanZheng'anDaozhen area, northern Guizhou Province. J. Geochem. Explor. ... analyses demonstrate that kaolinite is the most likely host mineral of Li in the studied bauxites and the leaching process after bauxite deposition can significantly reduce the lithium ...
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The process of extracting aluminum from bauxite involves crushing and refining the mineral to produce alumina, which is then used to produce aluminum metal. The global demand for aluminum has driven the growth of the bauxite industry, with major bauxiteproducing countries including Australia, Guinea, Brazil, and China.
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Commercial utilization of highsulfur diasporic bauxite is challenging because of the hazards of sulfur to the Bayer process. This article discusses a case study of producing alumina from high ...
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In this study, the Taiping bauxite deposit, a representative large deposit in this area, was selected to carry out detailed mineral microanalysis and pyrite sulfur isotope analysis to further understand the metallogenic process of bauxite in this region. Taiping bauxite contains two layers: the lower bauxite layer and the upper claystone layer.
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This process has been repeated several times with maximum distribution throughout the profile due to environmental changes, including periodic fluctuations in the groundwater level. ... aiming to clarify the diasporeforming mechanism and explore the genesis of bauxite. Generally, bauxites in northern NCC contains three layers from bottom to ...
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The bauxite overburden material in Brazil includes some topsoil and lateritic crusts, as well as thick clays that cover most bauxite deposits of the Brazilian Amazon region. These thick overburdens are usually considered a drawback during mining, as their removal increases the costeffectiveness of the whole mining process.
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However, the metallogenic mechanism of bauxite is still obscure due to the unclear formation process of the main ore mineral, diaspore. We conducted geological, ... However, the genesis of many bauxite occurrences remains insufficiently explained and untouched by modern models and techniques. The karst bauxite of the Unterlaussa mining district ...
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The downward enrichment in REEs and Y to the bottom of the bauxite ore was probably due to the bioleaching process postdeposition (Laskou and EconomouEliopoulos, 2013; Liu et al., 2020a). ... Carboniferous sequences in the southwestern North China Craton: implications for the regional tectonic evolution and bauxite genesis.
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We conducted geological, mineralogical, δ 34 S pyrite, and insitu diaspore trace element analyses on the BaodeXingxian large bauxite deposit in the northern NCC, aiming to clarify the diasporeforming mechanism and explore the genesis of bauxite. Generally, bauxites in northern NCC contains three layers from bottom to top: Febearing ...
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We conducted geological, mineralogical, δ 34 S pyrite, and insitu diaspore trace element analyses on the BaodeXingxian large bauxite deposit in the northern NCC, aiming to clarify the diasporeforming mechanism and explore the genesis of bauxite. Generally, bauxites in northern NCC contains three layers from bottom to top: Febearing ...
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Croatian bauxites are long known for their chemical and physical diversity arisen from their characteristic origin and emplacement within the area of the AdriaticDinaric carbonate platform (ADCP). They include eight horizons spanning the period between the Upper Triassic (Carnian) and the Miocene, formed on subaerially exposed platform paleoenvironments. The bauxite genesis is recorded in ...
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Geological aspects and lateritic bauxite deposit genesis process on the site is a very interesting research material. Based on field mapping, Gibsite is the bauxite formed with frame type is the result of weatherin sediment residue on the soil catena. The study area consists of rocks that form lateritisation overburden, soil laterite, iron cap ...
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The terrestrial deposition process for karst bauxite is difficult to constrain due to its allochthonous origin, multiple controls and the difficulty in geodynamic reconstruction. This ambiguity has been clarified from investigation of the provenance and geologicgeographic conditions for the formation of Quaternary gibbsite nodules in the Yongjiang Basin.
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Processing of bauxite in the Bayer process is greatly determined by the nature of bauxite. Comparative dissolution behavior of gibbsite, boehmite and diaspore in alkali solution is presented in Fig. 2 [].It is evident that among the various types, gibbsitic bauxite is the most reactive and easily digestible (105140 °C).
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This bauxitization process affected the upper surface of the Ubaid limestone formation, which directly underlies the Nuwaifa bauxite Formation. ... Gu J, Huang Z, Fan H, Jin Z, Yan Z, Zhang J (2013) Mineralogy, geochemistry and genesis of lateritic bauxite deposits in the WuchuanZheng'anDaozhenarea, northern Guizhou Province, China. J ...
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The genesis of the Lindai bauxite deposit, including the parental affinity, mineral genesis, migration and sedimentation, and oreforming process of the bauxite, has been described in detail by ...
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1 Introduction Overview of Bauxite Ore As a residue of strong chemical weathering, bauxite is mainly composed of Aloxyhydroxides, Feoxides/oxyhydroxides and Tioxides (mainly TiO 2 phases) (Bárdossy, 1982, 1994; Bárdossy and Aleva, 1990; D'Argenio Mindszenty, 1995; Retallack, 2010 ).
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Introduction. Bauxite residue is a highly alkaline waste discharged from the process of alumina production. In recent years, the global industrial inventory is approximately 5 billion tons, with an annual increase of 200 million tons (Wu et al., 2020).Due to its high salinealkalinity, and potential environmental risk, the comprehensive utilization rate of bauxite residue is less than 10% ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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