Solution Verified by Toppr Correct option is A) The bauxite is purified by the Bayer Process. First the ore is mixed with a hot concentrated solution of sodium hydroxide. The NaOH will dissolve the oxides of aluminum and silicon but not other impurities such as iron oxides, which remains insoluble.
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Bauxite residue is generated during the Bayer process of alumina recovery from bauxite ore. The chemical compositions of bauxite residue are associated with the alumina process and the raw bauxite ores. ... In the process of changing acetic concentration from to mol/L, the loss of lithium was stable around %. However, further ...
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The ore is first converted into pure aluminum oxide by the Bayer Process, and this is then electrolyzed in solution in molten cryolite another aluminum compound. The aluminum oxide has too high a melting point to electrolyse on its own. The usual aluminum ore is bauxite. Bauxite is essentially an impure aluminum oxide.
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Bauxite is a hydrated aluminum oxide in the form of gibbsite, boehmite or diaspore that forms through surface weathering and direct chemical precipitation. Surface processes introduce a complexity and diversity of ore and impurity compositions that requires careful consideration of analytical technology when designing exploration, grade control ...
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Bauxite residues from alumina production. Aluminium production consists of two key stages: The first is alumina refining (Bayer process), which involves the generation of alumina from bauxite ore; the second stage is aluminium smelting (HallHéroult), the process of transforming alumina into Most of the world's alumina is produced using the Bayer process, although minor volumes ...
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The process is demonstrated in the following examples: Leaching of alumina from bauxite. The primary ore of aluminium is bauxite. Impurities such as SiO 2, iron oxides, and titanium oxide (TiO 2) are common. Heating the powdered ore with a concentrated solution of NaOH at 473523 K and 3536 bar pressure is used to concentrate it.
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Name the following elements : (i) A trivalent metal used to make light tools. (ii) A monovalent nonmetal present in fluorspar. Baeyer's process is used to concentrate bauxite ore to alumina. Give balanced chemical equations for the reaction taking place for it's conversion from bauxite to alumina.
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Keeping the above characteristics in view, several west coast lateritic bauxite mines of India employ dry crushing−screening process to bring down silica content from the metallurgical grade bauxite [].Recently, a bauxite mine of Guinea known as AGB2A has also adopted the dry beneficiation procedure to cut down silica from about 7% to below 3%, to make this one the best metallurgical grade ...
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Red mud is composed mainly of fine particles of silica, aluminum, iron, calcium, and titanium oxides in different proportions dependent upon the bauxite ore, aluminum extraction conditions, and quality control. Table shows the constituent differences which are attributed to the type of bauxite ores and process conditions (Gu et al., 2012 ...
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Bauxite ore is the world's main source of aluminum. Bauxite is a rock formed from a reddish clay material called laterite soil and is most commonly found in tropical or subtropical regions. Bauxite is primarily comprised of aluminum oxide compounds (alumina), silica, iron oxides and titanium dioxide. Approximately 70 percent of the world's ...
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Answer NCERT Solutions CBSE CBSE Study Material Textbook Solutions CBSE Notes Bauxite is concentrated by: A) Chemical method B) Roasting C) Magnetic separation D) Froth flotation process Answer Verified + views
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Among environmental hot spots all over the world are the tailings of RM, generated during the digestion of bauxite ore with sodium hydroxide by Bayer process for the extraction of alumina. The term 'red mud' is used as a synonym for 'bauxite residue'. The residue generated is usually highly alkaline with pH about [1, 2].
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The bauxite is purified by the Bayer Process. First the ore is mixed with a hot concentrated solution of sodium hydroxide. The NaOH will dissolve the oxides of aluminum and silicon but not other impurities such as iron oxides, which remains insoluble. The insoluble materials are removed by filtration. The solution which now contains the oxides ...
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The process of separating bauxite concentrate from bauxite ore is a process of removing gangue minerals and harmful impurities, separating highaluminum minerals and lowaluminum minerals, and obtaining concentrates with a high aluminumsilicon ratio. ... flotation, magnetic separation, chemical beneficiation, etc. Bauxite ore washing is the ...
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The iron recovery ratio, Fe2O3 content in iron concentration and the bauxite dissolution ratio of each process were investigated. Moreover, the optimizations of the leaching, roasting and magnetic separation conditions were studied. Results indicate that the RSL process should be an advisable order to recover both alumina and iron.
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Scandium extraction from the Greek bauxite residue has been demonstrated at an industrial pilot plant at MYTILINEOS. This work comes as the result of the H2020 SCALE collaborative research project. By combining sulfuric acid leaching and IIVI SelectiveIon Recovery (SIR) technology, a 22 wt% Sc concentrate has been produced from the Greek Bauxite Residue that contains 70100 mg/kg Sc.
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bauxite, rock largely composed of a mixture of hydrous aluminum 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, or pealike; still others are porous but strong or are stratified or largely pseudomorphic after ...
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Bauxite is a sedimentary rock mineral that is the primary source of aluminum. It is formed through the weathering of aluminumrich rocks in tropical and subtropical regions. The name bauxite is derived from the French village of Les Baux, where it was first discovered in 1821 by geologist Pierre Berthier. Bauxite is typically found in layers beneath a few meters of overburden, which can vary ...
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This paper systematically investigated the leaching behavior of bauxite lithiumrich beneficiation tailings in caustic solution, together with their phase and morphological changes. The main chemical compositions (mass percent) of bauxite flotation tailings were % Al2O3, % SiO2, % K2O, % TiO2, % Fe2O3, % MgO, and % Li2O. The occurrence state of the lithiumbearing ...
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Details of the Bayer process and related chemical issues for alumina production have been summarized in literature (Adamson et al., 2016). Bauxite residue waste has limited practical applications. The volume and composition of the generated waste depends on the quality of the bauxite ore, refinery design, and process conditions.
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Solution. (1) The chief ore of aluminium is Bauxite Al 2 O 3 · 2 H 2 O from which aluminium is extracted. (2) The process of concentration of bauxite is done by Bayer's process. (3) In the electrolytic reduction of aluminium, alumina is added to cryolite because it lowers the fusion temperature of the electrolytic bath in the extraction of ...
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Bauxite ore can be extracted from ore washing, flotation, magnetic separation, and chemical and physical methods to extract metal aluminum. Among them, flotation is a more commonly used method in bauxite beneficiation process in recent years. Ore washing is a simple and effective method to increase the aluminumsilicon ratio of bauxite ...
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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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