WEB(i) Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore. (ii) Name the process by which impure ore of aluminium gets purified by using concentrated solution of an alkali. (iii) Write the equation for the formation of aluminium at the hode during the electrolysis of alumina.
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WEBJan 1, 2019 · The generation of this residue comes from the refinement of alumina for later aluminum production, in which bauxite undergoes a chemical process based on the precipitation of aluminum hydroxide ...
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WEBJun 30, 2023 · 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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WEBSep 26, 2021 · The Bayer process holds an exclusive status for alumina extraction, but a massive amount of caustic "red mud" waste is generated. In this work, three oxalate reagents: potassium hydrogen oxalate (KHC 2 O 4), potassium tetraoxalate (KHC 2 O 4 ·H 2 C 2 O 4), and oxalic acid (H 2 C 2 O 4) were investigated for the Al and Fe extraction .
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WEBAlumina is properly called aluminum oxide, which is a chemical compound comprised of aluminum and oxygen molecules (Al 2 O 3 ). When refined from bauxite, alumina generally looks like a white powder similar to table salt or granular sugar. Aluminum oxide is typically referred to as alumina, but may also be called aloxide, aloxite or alundum ...
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WEB2 days ago · > Leaching is one of the metallurgical processes often used where the impurities remain insoluble and the metals get converted into soluble salts when a certain chemical is added into the ore. > Thus, the ore (bauxite) is concentrated by chemical reaction with a suitable reagent (hot concentrated [NaOH] solution.) that dissolves the .
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WEBThe first step is to heat the bauxite ore to temperatures of 200°c along with a sodium hydroxide solution. This will convert the aluminium oxide to a solution of sodium aluminate. The silica will dissolve itself in the process. The chemical equation is. Al 2 O 3 + 2 NaOH → 2 NaAlO 2 + H 2 O.
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WEBMay 26, 2023 · Red mud, also referred to as bauxite residue, is the largest process waste produced during alumina production from bauxite ore by the Bayer method. Approximately 1–2 tons of red mud are produced ...
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WEBThe process is based on different wetting characteristics of the ore and gangue particles with water and pine oil. The ore is wetted by oil and impurities are wetted by water. Ore particles are adsorbed on potassium or sodium ethyl xanthate (as a collector) and come at the surface along with the froth. Froth stabilizer (cresols, aniline ...
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WEBMay 1, 2014 · The bauxite ore, Bayer process materials before precipitation, mud residue, and sand residue are therefore of radiological interest, whereas the alumina product is Positional and personal monitoring data from bauxite mines and alumina refineries in Western Australia have been used to assess the abovebackground annual doses for the ...
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WEBThe abundance of gibbsite and goethite suggested intense weathering during the formation of the bauxite deposits. Chemical data of the bauxite showed high Al2O3 (– wt%) with varied Fe2O3 (– wt%), TiO2 (– wt%) and SiO2 (– wt%) contents, while other oxides are generally less than wt% indiing high ...
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WEBApr 17, 2023 · Experimental Method. In this study, the recovery of precious metals from bauxite ore was examined by a twostage leaching process. The stages of this process were Stage I: Removing iron to a large extent and revealing the solubility conditions of titanium by treating the bauxite ore with oxalic acid, Stage II: Determining the recovery .
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WEBThe aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite. (i) Name the process used for the purifiion of bauxite. (ii) Write the equation for the action of heat on aluminium hydroxide.
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WEBSep 27, 2018 · The ore is dug out from the opencast mines and contains aluminium oxide. The bauxite ore is purified to yield a white powder from which aluminium is extracted. The process of its extraction is done by electrolysis. Usually, bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution at a temperature of 150 to 200°C.
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WEBWhen the aluminabearing material in bauxite ore is converted into nonmagnetic material, the digestion temperature decreases significantly from 280 °C to 240 °C with a nearly 99% relative ...
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WEBAug 1, 2009 · The Bayer process is the principal method for the production of alumina from bauxite worldwide. The modern version of the process (developed in the 1880's) still maintains the key steps of dissolution of aluminarich minerals into hot caustic solution, separation of the insoluble phases, followed by gibbsite precipitation and calcination of .
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WEBDec 1, 2017 · The commercial Ga is the byproduct from Bayer liquor obtained from the bauxite leaching process and zinc residue generated by hydrometallurgical treatment of zinc concentrates (Zhao et al., 2012, Frenzel et al., 2016, Geological Survey, 2017). In the Bayer process, approximately 70% of the Ga is leached from the bauxite into the .
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WEBSolution. The correct option is D Leaching. Bauxite ore is concentrated by the process of leaching. It is a process in which a suitable solution is added to the ore. A chemical reaction takes place between ore and solution in which the ore dissolves in the solution. The insoluble impurities are filtered off.
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WEBJun 1, 2015 · The iron oxide in bauxite ore is present as hematite or goethite; silica as clay; and free quartz and titania as leucoxene or rutile. Bauxite is the principal ore of aluminum which is one of the most important nonferrous metals used in the modern industry. It is also an essential ore for refractory and chemical industries.
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WEBBauxite: as petrographic term is a residual sedimentary rock product of tropical chemical weathering in which the free aluminium bearing minerals (alumina hydroxide and oxyhydroxides) such: gibbsite, boehmite and diaspore attain min. 50% as shown in Fig. are bauxitic deposits, such as, Darling Range—Western Australi—which does .
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WEBOct 31, 2019 · From Bauxite. This manufacturing process is the most commonly used as bauxite is a ubiquitous material. It involves reacting liquid sulfuric acid with either bauxite ore containing aluminum hydroxide (Al(OH) 3) and hydrated aluminum (Al 2 O 3 ∙ 3H 2 O), or synthetic hydrated aluminum previously refined from bauxite. Bauxite ore is the main ...
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WEBJul 2, 2021 · 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 .
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WEBSep 25, 2023 · The process of removing bauxite concentrate from the ore to remove harmful impurities and gangue particles is known as Bauxite beneficiation. It separates lowaluminum minerals and highaluminum materials to obtain high siliconaluminum concentrations. ... The main techniques of this process are ore washing, chemical .
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WEBChemical separation or Leaching. In this powered ore is treated with a suitable reagent which can dissolve the ore but not the impurities. Was this answer helpful? 0. ... The bauxite ore of aluminium is concentrated by froth flotation method. View Solution. Q5. Bauxite is concentrated by:
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WEBJan 15, 1999 · The Bayer process, as it has become known, is used for refining bauxite (named after Les Baux, the district in France where the ore was first mined) to smelting grade alumina, the precursor to aluminium. Typically, depending upon the quality of the ore, between and tonnes of bauxite is required to produce 1 tonne of alumina.
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WEBJan 1, 2016 · In this paper the results of a leaching kinetics study of bauxite ore with sodium. hydroxide are pr esented. The effect of or e particle size, s odium hydroxide concent ration and. reaction ...
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WEBMar 1, 2009 · Bittencourt, 1989, Bittencourt et al., 1990, aiming to obtain a gibbsite concentrate that could be used as raw material for the production of alumina refractories, tried direct flotation of the bauxite minerals from a Brazilian ore sample, composed basically of gibbsite (50%), kaolinite (15%) and quartz (35%). This flotation was carried .
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WEBQ. (i) Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore. (ii) Name the process by which impure ore of aluminium gets purified by using concentrated solution of an alkali. (iii) Write the equation for the formation of aluminium at the hode during the electrolysis of alumina.
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WEBJun 30, 2023 · 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 .
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