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 ...
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
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 ...
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 ...
Geochemistry of the early Jurassic Soleiman Kandi karst bauxite deposit, IranoHimalayan belt, NW Iran: 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.
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.
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.
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.
However, there are actually two types of bauxites. The genesis of only one of them can be adequately explained by the lateritization process. Lateritization usually means that aluminumbearing igneous rocks (like granite) are slowly weathering to clay minerals, which are then altered to aluminum hydroxides by continuous leaching of silica.
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 ...
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.
Karst bauxite deposits in the North Dalmatian piggyback basin (NDPGB) are a part of the Mediterranean bauxite belt, which is the largest European bauxite deposit zone; however, there is a general lack of information regarding the genesis, age, and precursor of the bauxite deposits in this region. In this study, we combined detrital zircon UPb geochronology with compositional, mineralogical ...
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 ...
Bauxite is the principal ore of aluminum. Bauxites vary physically according to the origin and geologic history of their deposits: some deposits are soft, easily crushed, and structureless; some are hard, dense, and pisolitic,
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.
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 ).
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.
This process has been repeated several times with maximum distribution throughout the profile due to environmental changes, including periodic fluctuations in the groundwater level. ... Constraints on bauxite genesis and the distribution of critical raw materials. 2022, Journal of Geochemical Exploration. Citation Excerpt :
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 ...
Bauxite residue is the byproduct generated by the extraction of alumina from bauxite ore via the Bayer Process ( using concentrated sodium hydroxide at high temperature and pressure), and is typically highly alkaline [].Currently, the yearly global production of bauxite residues is ca. 150 million tonnes (Mt) with a growing stockpile estimated to exceed billion tonnes [].
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.
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...
Bauxite is a sedimentary rock with a relatively high aluminium content. It is the world's main source of aluminium and gallium. ... Prior to the invention of this process, and prior to the Deville process, aluminium ore was refined by heating ore along with elemental sodium or potassium in a vacuum. The method was complicated and consumed ...
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 ...
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.
This pattern of critical metal enrichment reflects a threestage genesis of bauxite linked to in situ weathering and bauxitization, which provide insights into the weathering history of other ...
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 Fulltext available
The ICPMSDataCal program (Liu et al., 2008, Hou et al., 2009) was used to process the data to determine the UPb ages, and then, the Isoplot program was used to draw the concordia diagrams and calculate the weighted mean ... Implications for the regional tectonic evolution and bauxite genesis. Journal of Asian Earth Sciences., 98 (2015), pp ...
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.
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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