Bauxite is the main ore of aluminium with silica (SiO 2), ferric oxide (Fe 2 O 3) and titanium oxide (TiO 2) as impurities in it.; 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.
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Process Overview. The recently patented bauxitebased defluoridation method proposes the use of mildly processed (powdered) bauxite ore as a singleuse dispersive batch media in a communityscale system [24]. Bauxite, a globally abundant ore of aluminum, is a viable, effective, and lowcost fluoride adsorbent alternative to AA.
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Also known as enrichment, the concentration of ores is the method of removing impurities and other unwanted particles from the ore. The removal method of the gangue particles or the unwanted particles depends on the difference in physical or chemical properties of the ore and the impurities. The minerals present in ores are found in the form of ...
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Bauxite ore is treated within the Bayer process to produce metallurgi cal grade alumina which is the raw material for aluminum production. Bauxite ore depending on its origi n contains 40
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A process that involves treatment of ore with lime and soda is used in China and Russia. The Bayer process involves four steps: digestion, clarification, precipitation, and calcination. In the first step, bauxite is ground, slurried with a solution of caustic soda ( sodium hydroxide ), and pumped into large pressure tanks called digesters ...
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Leaching (metallurgy) Leaching is a process widely used in extractive metallurgy where ore is treated with chemicals to convert the valuable metals within into soluble salts while the impurity remains insoluble. These can then be washed out and processed to give the pure metal; the materials left over are commonly known as tailings.
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Bauxite is naturally insoluble in natural solvents. As a result, the addition of caustic alkali to bauxite is crucial for the extraction of aluminium. Bauxite dissolves in caustic alkali to generate soluble sodium meta aluminate, while impurities remain insoluble and precipitate as red mud. Suggest Corrections. 8.
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Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction. (a) Write three balanced equations for the purification of bauxite by Hall's process. (b) Name a chemical used for dissolving aluminium oxide. In which state of subdivision is the chemical used?
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Aluminium ore is called bauxite. First step in extraction of aluminium is purification of bauxite ore. 1)The bauxite is made impurity free to provide aluminium oxide from which aluminium can be extracted. The purification process is done with the help of leaching process. Leaching of alumina from bauxite:
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Purification of Bauxite ore. 1. Name of the purification process. It is the Baeyer's process that is used for the purification of impure oxides of Aluminum. 2. Chemical equations involved in Baeyer's process. The main impurities found in the impure oxide of Aluminum Al 2 O 3. 2 H 2 O are Iron(III) oxide, Fe 2 O 3 and Silica SiO 2.
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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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The HallHéroult process is a major industrial process that involves the smelting of aluminium. It involves dissolving aluminium oxide (alumina) obtained from bauxite through Baeyer's process. In this process, pure alumina is mixed with Calcium fluoride (CaF2) or Cryolite (Na3AlF6).
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One way of concentrating the ore is by chemical separation. For example, the separation of aluminium (Al) from the bauxite ore. This process of separating aluminium from the bauxite ore is also termed Bayer's Process. Hot NaOH reacts with the bauxite ore which leads to the formation of sodium aluminate which is watersoluble.
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Benefication process of ore Beneficiation or benefication in extractive metallurgy, is process which removes the gangue from mineral to produce a higher grade product (concentrate), and a waste stream . ... Leaching of bauxite ore to prepare pure alumina. Medium. View solution > The method used for the concentration of sulphide ores is: Medium.
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The lateritic bauxite hydrochloric acid leaching process showed that when the ore granularity was less than 55 μm, the liquid/solid ratio (L/S ratio) was 100:7, the leaching temperature was 373383 K, the leaching time was 120 min and the HCl concentration was 10%, both the leaching rates of Al and Fe were over 95% . But the hydrochloric ...
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In this process, the ore is first dissolved in a solvent at a particular temperature. For bauxite, the solvent is 45% NaOH solution and the temperature is 473573K. Let us take a look at the reactions involved. In the solution, the ore reacts with Sodium hydroxide and water.
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(a) Bauxite is heated under pressure with conc. caustic soda (NaOH) for 2 to 8 hours. Bauxite dissolves and forms sodium meta aluminate because of the amphoteric nature of aluminium, leaving behind insoluble impurities called red mud. Red mud consists of ferric oxide, sand, etc. which are removed by filtration.
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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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Vast amounts of red mud are produced at bauxite processing plants and stored in lagoons, often formed by flooding playedout bauxite pits when the ore is processed close to where it was mined.
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The correct option is B Conc. N a 2 C O 3 ... Q. In Hall's process, the bauxite ore is reacted with: Q. In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with N a O H is. Q. In the ore Bauxite A l 2 O H 2 O there are two significant types Red Bauxite and White Bauxite.
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What is Baeyer's process? or What is the process used for concentration of aluminium ore (Bauxite). Ans. Baeyer's process is the process for concentration of Bauxite ore. The impure baxuite is purified to pure aluminium through different steps. ... (Fe 2 O 3 and SiO 2) in bauxite remain unaffected with conc. alkali soln. Hence it is used to ...
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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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Serpeck's process. This process is used for the purification of bauxite ore containing silica (SiO 2) as the main impurity. The powdered ore is mixed with coke and the mixture is heated at about 1800°C in the presence of Nitrogen gas, when aluminium nitride is formed. Al 2 O 3. 2H 2 O + 3C + N 2 → 2AI N + 3CO+ 2H 2 O
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View Solution. Q 5. Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction. (a) Write three balanced equations for the purification of bauxite by Hall's process. (b) Name a chemical used for dissolving aluminium oxide.
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