The genesis of the Quaternary bauxites is a unique process that involved not only the formation of bauxite but also the renovation of karst topography 12.
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This process, related to the forebulge uplift at the latest stages of Alpine orogenesis, ... Until recently, the issues of bauxite genesis and its relation to the adjacent karst palaeoenvironment and its tectonostratigraphic constraints in Croatia have been largely underestimated. They were treated earlier in the context of paleoclimate ...
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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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Bauxite deposits are generally divided into two categories according to their occurrence status and genesis: (1) lateritic bauxite contains gibbsite as the main ... mineralogical and micromineralogical studies can provide information about the bauxite formation process and the denudation history of the source rocks (D'Argenio and Mindszenty ...
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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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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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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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The purpose of present work was to provide mineralogical insight into the rare earth element (REE) phases in bauxite residue to improve REE recovering technologies. Experimental work was performed by electron probe microanalysis with energy dispersive as well as wavelength dispersive spectroscopy and transmission electron microscopy. REEs are found as discrete mineral particles in bauxite ...
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In this study, we present the main findings from microstructural and mineralogical studies and their implications for the genesis of bauxite/laterite in Mainpat plateau. Megascopic studies showed reddish laterite to offwhite bauxite. Strong hydrolytic action formed small oolites and large pisolites with sizes of 12 cm in diameter. Pisolites and oolites were elliptical, circular, and as ...
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the process of bauxite deposition in Masatdaqqi region of Turkey. ... The genesis of bauxite is closely related to carbonate or mafic basement and controlled by lithofacies paleogeography ...
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ADVERTISEMENT Bauxite Used for Aluminum Production Bauxite is the principal ore of aluminum. The first step in producing aluminum is to crush the bauxite and purify it using the Bayer Process. In the Bayer Process, the bauxite is washed in a hot solution of sodium hydroxide, which leaches aluminum from the bauxite.
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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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The electrons in the current attach to oxygen and hydrogen, the other elements in . bauxite, leaving the aluminum. Ore Genesis. Earth contains a finite amount of ore. Ore genesis, the process by which a deposit of ore is created, is estimated to take millions of years.
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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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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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Xuefei Liu. Bauxite is the world's main source of aluminum and typically consists of gibbsite, boehmite, and minor amounts of diaspore. However, bauxite deposits from the North and South China ...
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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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Geochemistry of the early Jurassic Soleiman Kandi karst bauxite deposit, IranoHimalayan belt, NW : Constraints on bauxite genesis and the distribution of critical raw materials. A. Abedini, G. Mongelli, M. Khosravi. Journal of Geochemical Exploration • 1 October 2022. View details in Scopus 13 citations.
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The Maochang paleokarstic bauxite deposit, located at the middle Yangtze Block, is the largest concealed bauxite deposit in Guizhou Province, southwest China. It is characterized by high sulfur contents (up to wt%) in bauxites and the presence of pyrite layers with thicknesses of m in the lower and upper zones of the bauxite ...
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Bauxite (Fig. ) is formed by surface weathering of clay rocks around the tropical region and composer of aluminum oxide (Al (OH) 3 ). It contains 15%25% aluminum and only ore used for commercial extraction for aluminum. The bauxite occurs as nearsurface layers and usually mixed with clay minerals, iron oxide, and titanium dioxide.
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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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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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Each genetic group of bauxite has experienced separation of aluminum (Al) and silicon (Si) by the accumulation of Al, and the removal of Si, alkali metals, and rare earth elements from parent rock (sediment) during its weathering. Download : Download fullsize image Figure 1.
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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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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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Karst bauxite is a major source of aluminum and contains high concentrations of trace elements such as Li, Ga, Sc, and rare earth elements (REEs). It is regarded as a potential nonconventional REE source due to the increasing demand for REEs. This study provides new mineralogical and geochemical evidence of a Lindai bauxite deposit in central Guizhou Province, aiming to analyze the genesis of ...
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As for karst type bauxite, Mongelli (1997) and Öztürk et al. (2002) studied the genesis of the bauxite formation in the southern Aplian block in Italy and in Taurides, Turkey respectively and ...
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By far, gibbsite is the cheapest to process. In 1873, bauxite mining began in Villeveyrac in France. Since then, bauxite mining has grown to a huge scale. By the 1960s, world bauxite production had reached 40 million tonnes. It is now around 260 million tonnes. In 2016, Australia is the world's largest bauxite producer, producing 80 million tonnes.
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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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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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Its process continues for a sufficient time and weathering products that are avoided from erosion will produce lateritic deposits. Bauxite can be formed from lateritic processes. Bauxite genesis is closely related to the original rock, formation process, and geological environment of its formation. The dominant bauxite thickness is found in ...
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Bauxite is an important ore of aluminum, composed mainly of aluminum oxide and hydroxide minerals. It was named after the village Les BauxdeProvence in southern France, where it was first discovered in 1821 by geologist Henri Rouvère. Bauxites have a range of commercial applications, such as for the production of aluminum metal and aluminumbased chemicals, abrasives, cements, and ...
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Geology, geochemistry, and genesis of REY minerals of the late Cretaceous karst bauxite deposits, Zagros Simply Folded Belt, SW : Constraints on the oreforming process F. Ahmadnejad G. Mongelli Geology
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We propose that the triggering process for the genesis of the paleosol profiles, bauxitic material and bauxite pods was a coupled mechanism between favourable climate and uplift along the northern ...
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Ore genesis theories are dependent on the mineral or commodity. Ore genesis theories generally involve three components: source, transport or conduit, and trap. This also applies to the petroleum industry, which was first to use this methodology. Source is required because metal must come from somewhere, and be liberated by some process.
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