Bauxite is the major ore for aluminum production, and mainly consists of aluminum hydroxides and oxidehydroxides, iron oxides and oxidehydroxides, clay minerals, silicon dioxide and titanium dioxide, often in various polymorphic mineral phases. 7,8 The concentration of gallium in bauxite ranges from below 10 ppm to over 800 ppm, with an ...
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In Bayer's process, bauxite ore is leached by aqueous sodium carbonate... 05:52. Bayer's process : Caustic soda :: Hall's process : 04:13. Describe Bayer's process for concentration of bauxite ore. 12:56. Describe Bayer's process for concentration of bauxite. Text Solution. In Bayer's process. Al(OH)(3) in heating gives
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the dissolved metal as the "back" end. This is the essence of the continuous Bayer Process used by the industry today. Caustic liquor (a strong caustic soda solution) is the medium moving around the circuit. When bauxite is added, the aluminium dissolves and a "green" (or pregnant) liquor richer in aluminium is formed.
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bauxite feed. Keywords: Bayer process, trace elements, bauxite residue, cerium, yttrium. 1. Introduction. The presence and importance of many trace elements found in bauxites has been acknowledged decades ago, as well as their transfer into bauxite residue or product alumina during the Bayer process [1 3].
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Aluminum production from bauxite is achieved with the Bayer process, which is a hydrometallurgical method. However, in the Bayer process, in time, it is possible to encounter problems such as the formation of excessive amounts of red mud in aluminum production, its environmental risks, its requirement of large storage sites, the excessive production of reactants by ores with low silica modulus ...
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Red mud is a slimy caustic residue generated from alumina refining of bauxite ores. During the alumina extraction process, about 35 %40 % of the bauxite ores go into the residue as highly alkaline red mud slurry (pH ) which contains 15 %40 % of solid phase in volume [1, 2].Depending on the quality of bauxite ores, producing 1 t alumina basically generates t red mud [].
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3. concentration on silica concentration in the liquor at various residence time is shown below Caustic Concentration of Liquor Higher the caustic concentration faster will be the dissolution of reactive silica from bauxite in the liquor. But at the same time high concentration of caustic liquor will have a higher equilibrium concentration of the silica lowering the desilication rate. 2. ...
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In the Bayer's process of purification of red bauxtile leaching agent is. ... Describe Bayer's process for concentration of bauxite ore. 12:56. Describe Bayer's process for concentration of bauxite. Text Solution. Ask Unlimited Doubts; Video Solutions in multiple languages (including Hindi)
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In Bayer's 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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The Bayer process is used for refining bauxite to smelting grade alumina (Al 2 O 3), the precursor to aluminium. ... (Na2Ox or K2Ox) increases with an increase in concentration of the counter ion ...
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1. The Bayer Process Aluminium manufacture is accomplished in two phases: the Bayer process of refining bauxite ore to obtain aluminium oxide (which is carried out at AAL), and the HallHeroult process of smelting the aluminium oxide to release pure aluminium (the smelting process is not carried out at AAL). The first
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The Bayer Process is used to isolate alumina (Al 2 O 3) from bauxite. In this process, the manufacturer dissolves bauxite in sodium hydroxide to extract the aluminum from other components which are not soluble in sodium hydroxide, mainly The solution is referred to as Bayer liquor, and the temperature of this
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The bauxite slurry typically has lower caustic concentration liquor as the bauxite is received with some humidity that acts to dilute the liquor which mixes with it at the start of the process. Thus, the step to single stream digestion not only provides an extra heat sink to improve energy efficiency, it also reduces the heater tube caustic ...
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The reason for the same is that the higher bauxite solids concentration in the slurry would yield more desilication product seed, which could in turn accelerate the desilication process. Nowadays with the current technological advances, it is possible to pump and agitate slurry with solids concentration up to 800 1000 gpl.
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Dr. Dmitri Kopeliovich Bayer process is the process of refining alumina from bauxite (aluminum ore containing 3050% of hydrated aluminum oxide) by selective extraction of pure aluminum oxide dissolved in sodium hydroxide. Prior to the Bayer process bauxite is crushed and ground in mills to fine particles (max. size "/). A hot solution of the recycled sodium hydroxide (caustic soda ...
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Explain why a concentrated basic solution is used in the Bayer process. A strong base is used to dissolve aluminum oxide. Skill Describe the chemistry of the Bayer process for the extraction of alumina. Yes, it is. Skill Explain the chemical property base on electromotive potentials. A thin layer of aluminum oxide protects it from oxidation.
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Control the Bayer Process. Red bauxite ore is transformed in the Bayer process to white alumina powder. This is the raw material for the electrometallurgical extraction of Aluminum metal. The yield of the Bayer process is not simply related to the Aluminum grade in Bauxite that is determined by chemical analysis.
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Bauxite can be found in a number of different physical forms including: pisolitic, friable and hardcap. Each bauxite will have its own distinctive crushing and milling characteristics. Bauxite can be highly variable through the mine pit profile, both vertically and horizontally. Often large blocks from blasted or ripped bauxite can be upto 1±2 m 3
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ALUMINA FROM BAUXITE: THE BAYER PROCESS. Bauxite, the principal ore used for aluminum smelting, is named after Les Baux, Provence, the village where the first deposits were discovered. Bauxite contains hydrated alumina equivalent to as much as 4060% Al 2 O 3, and is free of the other siliceous materials leached out over time. However it ...
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Bayer process, trace elements, bauxite residue, cerium, yttrium. 1. Introduction. The presence and importance of many trace elements found in bauxites has been acknowledged decades ago, as well as their transfer into bauxite residue or product alumina during the Bayer process [1 3]. When entering the process, the significance of trace ...
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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. The broad ranges of contents are reflected in both the 68 main components and more than 50 trace elements.
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Austria 1888: Karl Josef Bayer first discovered the Bayer process (digesting crushed bauxite in strong sodium hydroxide solution at temperature up to 240oC. ... Dressing or Concentration of the Bauxite ore by Hall's method . The dressing is the process of extracting a metal from an ore in which gangue is removed and the ore is prepared for ...
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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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The trihydrate bauxite type gibbsite can be dissolved in a caustic solution in the temperature range of 373453 K (100180 o C). Monohydrate bauxite forms (boehmite and diaspore) are dissolved in ...
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Describe Bayer's Process. Doubtnut App Get 50 Lakh+ video solutions better than Google
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During the electrolysis process, the potential of the cathode relative to the reference electrode was measured as a function of the current at different concentrations of solid (100300 g L −1) and suspension temperatures (95120 °C).
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The Bayer Process: From Bauxite 20 to Aluminum Hydroxide To avoid any misunderstanding: The Bayer process has nothing to do with the worldfamous chemical company that produces aspirin, among other things. It is the main production method of aluminium oxide, named after its relatively unknown inventor.
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The production process of Bayer alumina is shown in Figure 2. In the Bayer process, bauxite is leached with a hot solution of sodium hydroxide (NaOH) at temperature of 150240°C and at 16 atm pressure . The aluminum minerals in the bauxite may be present as gibbsite (Al(OH) 3), boehmite (AlOOH) or diaspore (AlOOH) . The different forms of ...
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(1) Bayer's process is used to obtain pure aluminium oxide from bauxite. (2) Bauxite is then concentrated by chemical separation. Bauxite contains impurities like iron oxide (Fe(2)O(3)) and silica (SiO(2)). (3) Bauxite ore is powdered and heated with sodium hydroxide under high pressure for 2 to 8 hours at 140^()C in the digester. The aluminium oxide being amphoteric in nature present in ...
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