How many of the following species are related to Hall's process of purification of bauxite? White bauxite, Na(2)CO(3), CO(2), cryolite, red bauxite, NaOH ... The reaction not involved in the concentration of bauxite are by Hall's process is. 02:07. View Solution. ... Describe Hall's process for concentration of bauxite.
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During the processing of bauxite to alumina in the Bayer process, gallium accumulates in the sodium hydroxide liquor. From this it can be extracted by a variety of methods. The most recent is the use of ionexchange resin. Achievable extraction efficiencies critically depend on the original concentration in the feed bauxite.
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Approximately 70 percent of the world's bauxite production is refined through the Bayer chemical process into alumina. Alumina is then refined into pure aluminum metal through the HallHéroult electrolytic process. Mining bauxite. Bauxite is usually found near the surface of terrain and can be stripmined economically.
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Which of the following processes is used for the concentration of bauxite
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Step by step video image solution for How many of the following species are related to Hall's process of purification of bauxite? White bauxite, Na_(2)CO_(3), CO_(2), cryolite, red bauxite, NaOH by Chemistry experts to help you in doubts scoring excellent marks in Class 12 exams. ... Describe Hall's process for concentration of bauxite ...
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In Hall's process Al(2)O(3) (alumina) is mixed with Na(3)AlF(6) to reduce its melting point for electrolysis. ... In the purification bauxite by Hall's process. 01:29. View Solution. ADVERTISEMENT. ... Describe Hall's process for concentration of bauxite. Text Solution. Describe Hall's Process. 04:56.
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In Hall's process the ore is powdered and then it is leached by heating with aqueous sodium carbonate in the digester to form water soluble sodium aluminate. Then the insoluble impurities are filtered out. The filtrate is warmed and neutralised by passing carbon dioxide gas through it. This result in precipitation of aluminium hydroxide. Al(2)O(3) cdot 2H(2)O((s))+Na(2)CO(3(aq)) rarr underset ...
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1887: Austrian chemist Karl Josef Bayer working in Russia developed a method for extracting alumina from bauxite. 1888: Hall founded the Pittsburgh Reduction Company (known as Alcoa since 1907). 1890: The HallHeroult and Bayer discoveries had caused the price of aluminium to plummet 80%. In 1888, aluminium cost US per pound.
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(i) Chemical method or Leaching method is employed when the ore is in a very pure form . (ii) The ore is treated with a suitable reagent such that the ore is soluble in its but the impurities are not . (iii) The impurities are removed by filtration . (iv) The solution of the ore,, the filtrate is treated with a suitable reagent which precipitates the ore .
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The Bayer process is the principal industrial means of refining bauxite to produce alumina (aluminium oxide) and was developed by Carl Josef, the most important ore of aluminium, contains only 3060% aluminium oxide (Al 2 O 3), the rest being a mixture of silica, various iron oxides, and titanium dioxide. The aluminium oxide must be further purified before it can be refined ...
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The 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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(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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In Fig., the numbers on the graphs of equilibrium relate to caustic soda concentrations in Na 2 CO /C denotes aluminate ion concentration as Al 2 O 3 (A)/caustic soda concentration as Na 2 CO 3 (C). A typical Bayer process cycle with low temperature digestion is also shown. Virtually each bauxite contains more or less amount of clay minerals, mainly kaolinite (Al 2 (OH) 4 ...
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Ans. Baeyer's process : It is the process for concentration of Bauxite ore. The impure bauxite is purified to pure alumina through different steps. Step I : Conversion of impure bauxite to sodium aluminate. Step II : Conversion of sodium aluminate to aluminium hydroxide. Step III : Conversion of Al(OH)3 to pure alumina by heating it. f.
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(i) During extractino of aluminium from bauxite. The bauxite ore is concentrated by Bayer's Process. (ii) During concentration, baxuite is converted into alumina. (iii) Crude bauxite contains impurities like iron oxide and silica which are removed during Bayers' process. (iv) The ore is first group in a ball mil. Then it is leached by heating it with concentrated caustic soda solution under ...
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Which of the metal is extracted by HallHerold process? (a) Al (b) Ni (c) Cu (d) Zn Answer: (a) Al. Question 6. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true? (a) ∆G f ° of sulphide is greater than those for CS 2 and H 2 S. (b) ∆G r ° is negative for roasting of sulphide ...
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Describe Hall's process for concentration of bauxite. Answer: In Hall's process the ore is powdered and then it is leached by heating with aqueous sodium carbonate in the digester to form water soluble sodium aluminate. Then the insoluble impurities are filtered opt. The filtrate is warmed and neutralised by passing carbon dioxide gas ...
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Describe Hall's process for concentration of bauxite. Text Solution. Describe Hall's Process. 04:56. Hall's process is used for purification of . Text Solution. In the HallHeroult's process, the principal reagent is mixed with 02:47. Ask Unlimited Doubts; Video Solutions in multiple languages (including Hindi)
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In Bayer's process, aluminium ore is heated with concentrated caustic soda while in Hall's process, it is heated with aqueous sodium carbonate to obtain wate...
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Baeyer's process is used to leach Red Bauxite, which has Fe2O3 as the chief impurity. Serpeck's process, on the other hand, is used to leach White Bauxite, which has Silica as main impurity. Both are efficient for their respective ores. But Baeyer's process is more frequently used, as Bauxite, more often than not, is also a source of Gallium ...
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In the HallHéroult process, control of alumina concentration is crucial to process performance and safety. Existing logicbased alumina feed control typically implements overfeedbasefeedunderfeed cycles to control the cell voltage in a band to maintain the alumina concentration in a range. This, however, leads to significant variations of alumina concentration, and risks ...
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Bauxite is first purified to produce aluminium oxide, Al 2 O 3; Aluminium oxide is then dissolved in molten cryolite This is because aluminium oxide has a melting point of over 2000°C which would use a lot of energy and be very expensive; The resulting mixture has a lower melting point without interfering with the reaction
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Aluminium Ore Ores of Aluminium Aluminium is a highly reactive metal, belonging to the IIIA group of the periodic table. In nature, aluminium is found in the form of its oxide in its ores. The important ores of aluminium are Bauxite Al 2 O 3 .2H 2 O Corundum Al 2 O 3 Cryolite Na 3 AlF 6 Metallurgy of Aluminium
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Methods. The kinetics of bauxite residue neutralisation for each reactant was examined by mixing 20 g of water (reactant included, except for the control sample that had no reactant) with 20 g of bauxite residue solid concentration of the bauxite residue slurry was 55 wt.% and the solution composition as determined by titration (see below) gave A = (concentration of sodium ...
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Answer the following questions: Describe Hall's process for concentration of bauxite. ... Describe Hall's process for concentration of bauxite. Ask doubt. Courses. IITJEE. Class 11; Class 12; Dropper; NEET. Class 11; Class 12; Dropper; UP Board. Class 9; Class 10; Class 11; Class 12; Bihar Board.
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Find an answer to your question Describe Hall's process for concentration of bauxites . divyajain12 divyajain12 Science Secondary School answered Describe Hall's process for concentration of bauxites . See answer Advertisement ...
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Describe the Hall process for the production of aluminum from the mineral bauxite. How is energy saved by recycling aluminum rather than preparing it by the Hall process? AI Homework Help. Expert Help. Study Resources. Log in Join. QE, Ex QE, Ex All Textbook Solutions; Chemistry;
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1) Purification of Bauxite. The purification of bauxite ore can be done by Baeyer's process. a) The powdered bauxite ore is treated with hot concentrated (45%) solution of sodium hydroxide at 473523 K and 35 36 bar pressure. b) In this process, alumina (Al 2 O 3) dissolves forming sodium aluminate. This process is called leaching.
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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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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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