The Bayer process is used worldwide for the alumina production. This process involves the alkaline leaching of bauxite to extract Al, followed by the precipitation of Al(OH) 3 to recycle the solution [1,2,3].The leaching process results in the formation of a solid residue, commonly referred to as a bauxite residue, which consists of iron minerals, hydrous aluminosilicates, which are formed ...
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Find detailed answer to Which process is used for the concentration of Bauxite (Al2O clicking on this link. Chapter Chosen. General Principles And Processes of Isolation Of Elements ... Which process is used for the concentration of Bauxite (Al 2 O 2 O)? Leaching. 254 Views. Switch; Flag; Bookmark; Advertisement . Advertisement . Flag it ...
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Solution. Verified by Toppr. Correct option is C) Chemical separation or Leaching. In this powered ore is treated with a suitable reagent which can dissolve the ore but not the impurities. Solve any question of General Principles and Processes of Isolation of Elements with:. Patterns of problems.
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(a) Baeyer's process is used to concentrate bauxite ore to alumina. Give balanced chemical equations for the reaction taking place for its conversion from bauxite to alumina. (b) Complete the following by selecting the correct option from the choices given: (i) pH of acetic acid is greater than dilute sulphuric acid. So acetic acid contains
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Bauxite is not a mineral but a rock with minerals in it. It is a claylike substance which is pinkish, whitish or reddish in color depending on the amount and type of impurities. It is soft and, when struck with a hammer, does not produce a metallic sound. Its specific gravity is generally around and it has a Mohs hardness of 1 to 3.
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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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In this paper, iron concentrate and bauxite were used as main raw materials to prepare FeAl 2 O 3 composites in a pressureless sintering furnace by the carbothermal reduction method. The effects of different bauxite contents on the phase composition, microstructures, mechanical properties, and the corrosionresistant were investigated.
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Froth flotation process. Question 4(2016) (i) Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process. (ii) Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
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Bauxite residues from alumina production. Aluminium production consists of two key stages: The first is alumina refining (Bayer process), which involves the generation of alumina from bauxite ore; the second stage is aluminium smelting (HallHéroult), the process of transforming alumina into Most of the world's alumina is produced using the Bayer process, although minor volumes ...
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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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Phosphate can be used to facilitate the concentration and precipitation of lithium from lowconcentration solutions. In this study, a novel process has been developed to extract lithium as lithium phosphate from bauxite mine tailings, which includes: 1) leaching with mixed acid (H 3 PO 4 + H 2 SO 4), 2) leachate neutralization, and 3) Li 3 PO 4 ...
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Alumina Extraction Problem. In the standard Bayer Process for refining bauxite to produce alumina, the dissolution of the alumina in the ore to form sodium aluminate is accomplished in autoclaves under high pressures varying from 70 to 200 pounds per square inch. However, some lateritic bauxite ores are readily soluble in caustic, making it ...
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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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The process of Leaching is used to concentrate the ore. NaAlO 2 + 2H 2 O → NaOH + Al(OH) 3. Serpek's process: This process is used when the bauxite ore contains a higher percentage of silica as an impurity. In this process, powdered bauxite ore is mixed with carbon (coke) and heated to 1473K in a current of nitrogen.
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The process stages are: 1. Milling. The bauxite is washed and crushed, reducing the particle size and increasing the available surface area for the digestion stage. Lime and "spent liquor" (caustic soda returned from the precipitation stage) are added at the mills to make a pumpable slurry. 2.
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The diasporicbauxite flotation process is too long and complicated, with froth overflowing and pulp underflowing in multiple phases, resulting in couplings among different cells. Besides, there are large variations in concentrate grade and difficulties in online measurement, and grade prediction only by rougher features has the disadvantage 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 aluminium oxide being amphoteric in nature present in ...
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Name the method used to concentrate bauxite? . diyam55 diyam55 Chemistry Secondary School ... Bayer's process is used for the concentration of aluminium ore, bauxite. In this process, the impurities like iron oxide and silica are removed.
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1. Introduction. It is well known that almost all of the metallurgical alumina (Al 2 O 3) production in the world has been obtained through the Bayer process used bauxite as a primarily raw is the name of a mineral group composed mostly of gibbsite (Al(OH) 3), boehmite (γAlO(OH)) and diaspore (αAlO(OH)) as hydrated aluminum oxides.. Bauxites are typically associated with ...
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Is leaching used for concentration of bauxite? Leaching is used for the concentration of red bauxite, gold ores and silver ores. How is leaching done? 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 ...
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Solution. Bayer's process is used for the purification of bauxite Al 2 O 3 · 2 H 2 O. Aluminium is extracted by Bayer's process. The bauxite is powdered and mixed with a concentrated solution of caustic soda NaOH to give sodium meta aluminate and impurities are removed by filtration. Chemical reaction: Al 2 O 3 · 2 H 2 O ( s) ⏟ bauxite + 2 ...
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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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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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The concentration, temperature and pressure used depend on the source of the bauxite and exactly what form of aluminum oxide it contains. Temperatures are typically from 140°C to 240°C; pressures can be up to about 35 atmospheres. ... The high cost of the process because of the huge amounts of electricity it uses. This is so high because to ...
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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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Write the process used for the concentration of this ore. Answer. Froth floatation process can be used for the concentration of this ore as formation of sulphurous anhydride suggests that it is a sulphide ore. Sulphide ores are lighter than the impurities present hence froth floatation process is used for the concentration of this ore. Question 12
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technology is presented as a method to upgrade and preconcentrate bauxite deposits for use in alumina production. Dry processing with the ... mud are both related to the quality of bauxite used in the refining process. In general, the lower the Al2O3 content of bauxite, the larger the volume of red mud that will be generated, as the non
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Solution. Bayer's process is used in the concentration of Bauxite ore ( Al 2 H 2 O 4 ) In this method, the aluminium ore, bauxite, is heated in a pressure vessel with a solution of Sodium hydroxide ( NaOH ) at a temperature of 150 ° C to 200 ° C. Suggest Corrections.
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Introduction. Aluminum oxide (Al 2 O 3), commonly referred to as alumina, is extracted from bauxite, which is usually found on the surface of tropical and subtropical Bayer process has been the primary method for extracting alumina from bauxite ore for over 125 years. Lateritic bauxites that are rich in Al oxihydroxides, such as gibbsite (Al(OH) 3) and boehmite (AlOOH) (Smith ...
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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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1. Introduction. Depending on the composition and properties of the feedstock, alumina (Al 2 O 3) is produced by a variety of industrial processes [].Lowsilica bauxites are used worldwide for the production of alumina by the most energyeffective Bayer process, which is based on alkaline leaching with continuous regeneration of the solution by the desilication and precipitation of aluminum ...
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A process of concentration and refining of the scandium concentrate was developed based on the ability of scandium hydroxide to be dissolved in sulfuric acid and form complex compounds (of type [Sc(SO 4) 3] 3−). At the introduction of alkaline metal sulfate to Sccontaining sulfate solution, the formation and precipitation of double salts occurs.
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The methods used will depend on the metal required to be extracted and the difference in physical and chemical properties of the unwanted minerals and the metals present in the ore. Let us look at the different methods used for the concentration of ores. Leaching method; This process is relatively easy but is not considered very efficient.
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This dissolves aluminium oxide present in bauxite due to the formation of sodium aluminate, (N a A l O 2 ). A l 2 O 2 . H 2 O + 2 N a O H → 2 N a A l O 2 + 3 H 2 O. Since, N a O H a strong reducing agent, it is used in Bayer's process.
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Solution. The correct option is A. Bayer's process. Bayer's process is used for concentration of bauxite ore. The end product is concentrated alumina Al2O3. HallHeroult's process is used for reduction of alumina to aluminium. Hoopes process is used for refining aluminium. Suggest Corrections.
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