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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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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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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In aluminum processing: Extraction and refining. .from bauxite is a twostep process: refining bauxite to obtain alumina and smelting alumina to produce aluminum. Bauxite contains a number of impurities, including iron oxide, silica, and titania. If these impurities are not removed during refining, they will alloy with and contaminate the ...
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Bauxite: 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.
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Bauxite ore occurrence. Bauxite ore is formed from the intense lateritic weathering of residual clays, which accumulate in topographic lows on continental surfaces. 13 Bauxite deposits can be classified according to their geological formation into lateritic (89%), karst (10%) and Tikhvintype (<1% of world's deposits). 60, 61 Trace elements ...
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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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The process of Leaching is used to concentrate the ore. The ore of the metal is made to react with a suitable chemical reagent leading to the dissolution of only the metal, leaving behind the impurities which remain undissolved. The solution so obtained is a compound of the metal that can be further processed to extract the pure metal.
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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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Zhang et al. used a twostage acid leaching process to extract titanium from bauxite residue using the nature of titanium insolubility in lowconcentration HCl. First, the bauxite residue was leached directly with a low concentration of HCl (5 mol/L is preferable), followed by H 2 SO 4 with a mass fraction of 92%, under the conditions of the ...
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PROCESS DESCRIPTION: BAUXITE MINING. Bauxite is the principal ore of alumina (Al 2 O 3 ), which is used to produce aluminum (Al). It is composed of hydrated aluminum oxides, hydrated aluminosilicates, iron oxides, hydrated iron oxides, titanium oxide, and silica. It contains mixtures of various minerals such as gibbsite, boehmite, hematite ...
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Bauxite ore () is the major source of aluminium till date which is a mixture of hydrated aluminium oxide. Aluminium can also be recovered from cryolite (Na3AlF6) and alunite. It is also found in gemstones such as garnet, topaz and chrysoberyl. The chemical symbol of this metal is Al.
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A threestage method (grinding, roasting and digestion) was adopted to study the effect of particle size on the desulfurization rate and digestion performance of highsulfur bauxite in the process of producing alumina. The results demonstrated that the desulfurization efficiency of coarsegrained bauxite was significant by roasting, the sulfur content of raw ores with 380 μm size reduced to 0 ...
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Concentration of ore is a step involved in the process of extraction of metal from its ore. Unwanted rocks and grit are eliminated from mineral ore in this process. Hydraulic washing, froth floatation process, magnetic separation and chemical separation are some of the techniques used for concentrating or purification of ores. Hydraulic washing:
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Under the leaching conditions of Al and Li of an acid concentration of 60%, a liquidsolid ratio of 4 mL/g, a reaction temperature of 100 °C and a reaction time of 3 h, the highest leaching rates ...
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Chemistry Leaching Question Bauxite is concentrated by: A Chemical method B Roasting C Magnetic separation D Froth flotation process Solution Verified by Toppr The bauxite is purified by the Bayer Process. First the ore is mixed with a hot concentrated solution of sodium hydroxide.
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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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The result shows that it is possible to achieve a bauxite concentrate of from feed silica content of % at 88% yield. The reactive silica content of the scrubbed product is %. ... Process flowsheet of bauxite ore to remove silica and reactive silica from the ore. ... Sizewise chemical analysis of a typical Bauxite Ore sample from ...
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Details of the chemical composition of the raw ore are listed in Table 1. The ore was mainly composed of iron and alumina, with contents of % and %, respectively. Some other major chemical components found were CaO, TiO2, and SiO2, and the harmful elements S and P were less than %. The results of the XRD analysis are presented in ...
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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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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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In this process, the bauxite ore is first crushed and then it is leached by heating with hot concentrated caustic soda (NaOH) solution under high pressure for 2 to 8 hrs at 140 to 150 °C in a tank called a digester. Aluminium oxide, being amphoteric in nature, dissolves in an aqueous NaOH solution, forming watersoluble sodium aluminate.
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