WEBJun 15, 2021 · (a) Write three balanced equations for the purifiion of bauxite by Hall's process. (b) Name a chemicals used for dissolving aluminium oxide. In which state of subdivision is the chemical used? (c) Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process.
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WEBMay 5, 2015 · 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 .
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WEBObserve the following statements regarding purifiion of bauxite: I. During Hall's process, silica is removed as Si (vapour). II. Bauxite ore contaminated with F e 2 O 3 is purified in Baeyer's process. III. During Serpeck's process, A l N is formed.
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WEB3 days ago · Complete answer: Leaching is a process which consists of treating the powdered ore with a suitable reagent such as acid base or other chemicals which can selectively dissolve the ore but not the impurities. First the bayer's process is used for obtaining pure alumina from the bauxite ore . The bauxite ore contains many impurities .
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WEBBauxite is generally extracted by open cast mining, being almost always found near the surface, with processes that vary slightly depending on the loion. Before mining can commence the land needs to be cleared of timber and vegetation. Alongside this process may be the collection of seeds and/or saplings, for inclusion in a seedbank, which ...
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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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WEBJul 1, 2010 · In the Bayer process, the bauxite dissolves in a sodium. hydroxide solution at temperatures ranging from 373 to 543. K depending on the form of alumina in the bauxite [1,10]. Dissolution ...
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WEBBayer's.... process is used for the purifiion of bauxite.
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WEBJun 28, 2023 · The Bayer process is the main method of alumina production worldwide. The use of lowquality bauxites for alumina production results in the formation of a significant amount of technogenic waste—bauxite residue (BR). The Bayer reductive method is one possible way to eliminate BR stockpiling, but it requires highpressure .
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WEBMay 28, 2024 · Leaching is used for the purifiion of Bauxite ore. Leaching is a process that is used in extractive metallurgy. In this process, the ore is treated with chemicals to convert the valuable metals within into soluble salts while impurity remains insoluble. Key Points. The leaching of aluminium oxide from bauxite is called Baeyer's .
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WEBJul 3, 2023 · 1) Purifiion of Bauxite. The purifiion 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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WEBJun 6, 2024 · The powdered bauxite is mixed with carbon and heated up to 1800℃ and a current of nitrogen is passed, aluminum nitride is obtained. Al2O3. 2H2O + 3C +N2 A l 2 O 3. 2 H 2 O + 3 C + N 2 → 2AIN + 3CO + 2H2O 2 A I N + 3 C O + 2 H 2 O. Aluminium nitride thus obtained is hydrolysed with water to get a precipitate of Al(OH)3 A l ( O H) 3.
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WEBThe Bayer process is a chemical process for refining aluminium hydroxide, Al(OH) 3 from bauxite; this aluminium hydroxide is subsequently calcined to produce alumina, Al 2 O basis of the Bayer process is an understanding of the characteristics of the sodiumhydroxide—sodiumaluminate solution relationship, namely its ability to keep sodium .
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WEBDec 4, 2018 · The rapid development of the global alumina and aluminum industry is straight coupled with the demands and the needs of these materials. Nowadays, the only wellknown accessible resources to produce alumina and aluminum are bauxite ores. But bauxite ores are limited, and the remaining exploitable reserves do not have high .
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WEBAug 1, 2023 · A bauxite residue typically contains 15–25% of alumina depending on the origin of its ore and process conditions. Along with alumina, it also contains iron, titanium and rare earth elements ...
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WEBFeb 2, 2011 · Abstract. Bauxite is processed in alumina refineries by the Bayer process in which Alcontaining minerals are dissolved in hot NaOH. The insoluble solids (bauxite processing residue mud and sand) are washed, sometimes partially neutralized (using CO 2 or seawater treatment), and deposited in impoundments surrounding the refinery using .
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WEBWhich process is not used in purifiion of bauxite? (1) Hall's method (2) Baeyer's method (3) Serpek's method (4) Frankland's method General Principles and Processes of Isolation of Elements Chemistry Mini Question Bank Practice questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 .
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WEBSodium hydroxide is added to bauxite ore during purifiion of bauxite. Bauxite is reacted with a conc. solution of NaOH under pressure for 2 hrs as a first step in obtaining Al 2 O 3. The impurities present in bauxite mainly Fe 2 O 3 and SiO 2 remain unaffected with conc. NaOH as impurities are not amphoteric. Bauxite, being amphoteric reacts ...
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WEBJun 4, 2024 · Bauxite ore can be extracted from ore washing, flotation, magnetic separation, and chemical and physical methods to extract metal aluminum. Among them, flotation is a more commonly used method in bauxite beneficiation process in recent years. Ore washing is a simple and effective method to increase the aluminumsilicon .
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WEBJun 8, 2018 · Which of the following method is used for purifiion of bauxite containing iron oxide as impurity? (a) Serpeck's method. ... The process employed for the purifiion of copper with cuprous oxide as the impurity is. asked Jan 1, 2022 in Chemistry by Sivapriya01 ( points)
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WEBJul 12, 2019 · As the minerals are weathered they gradually breakdown into various forms of hydrated aluminum oxide, Al 2 O 3 .xH 2 O, known as bauxite. 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 .
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WEBSERPEK'S PROCESS : The process is used for the bauxite ore which contain silica as major impurity [which is called white bauxite]. The powdered bauxite ore is mixed with carbon and heated at high temperature in the presence of N 2 gas,during this process AlN,CO and H 2 O are formed. Hydrolysis of AlN produces Al (OH) 3 and NH 3,Al (OH) .
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WEBHall's process for leaching of alumina from bauxite: (1) Bauxite ore and sodium carbonate are fused toghether to convert aluminium oxide into soluble sodium metaaluminate. The insoluble residue contains the impurities of silica and .
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WEB5 days ago · Write the process used for the concentration of this ore. Ans: Froth Floatation is used for the concentration of this ore. 12. a. Define roasting. Name an ore on which roasting is done. Give balanced equation. ... b. i. Name the process used for the purifiion of bauxite. Ans: Baeyer's process. ii. Write the equation for the action of .
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WEBPurifiion of bauxite to fabrie aluminum and, to a lesser extent, alumina, is done by the Bayer process. Bauxite consumption per ton of alumina has increased in recent years (from around tons in 2005) due to declining quality of bauxite resources and now three tons of bauxite are required to produce one ton of alumina and two tons of ...
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WEBThe most commonly used process for the purifiion of white bauxite is the Bayer process. Let's delve into the details of this process. Bayer Process. The Bayer process is a chemical process used to extract alumina from bauxite ore. It was developed in the late 19th century by Austrian chemist Karl Bayer and is still the primary method used ...
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WEBNov 4, 2022 · The bauxite enables the transition to the modern technical appliion of the aluminium oxide. The ore was discovered as early as 1821 by the French geologist Pierre Berthier and named after its place of discovery, LesBauxdeProvence in France. However, the rock had to wait several more years for its appliion.
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WEBDec 28, 2023 · The sodium hydroxide (NaOH) used in the Bayer process for the digestion step to produce sodium aluminate is lost because of the presence of reactive silica in the bauxite samples [2, 3]. Therefore, it is only possible to produce % alumina from the Bayer process. Other purifiion processes must be applied to produce 5N alumina .
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WEBPrinciple of zone refining. The principle of zone refining is that the impurities in an ingot or ore of metal are more soluble in the melt state when compared to the corresponding solidstate of the impurities. In the zone refining process, the impurities are concentrated at one end of the block of metal so that the rest of the block is purified.
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