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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Zinc ores normally contain 515% zinc. Approximately 80% of zinc mines are underground mined, 8% are mined from open pits, and the remainder are a combination of both ores ( Ray et al., 2014 ). Zinc concentrate, which contains approximately 55% zinc, is roasted at a temperature approximately 800°C (1472°F).
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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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(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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The main component of bauxite is Al 2 O 3, containing a small amount of Fe 2 O 3, SiO 2, and other impurities. The main objective of bauxite beneficiation is to lower the concentration of reactive silica, and also to increase the alumina content. In addition, bauxite beneficiation can also be used for iron extraction or iron removal.
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The bauxite is purified by the Bayer Process. First the ore is mixed with a hot concentrated solution of sodium hydroxide. The N a O H 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 method is called the chemical method.
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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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The process is demonstrated in the following examples: Leaching of alumina from bauxite. The primary ore of aluminium is bauxite. Impurities such as SiO 2, iron oxides, and titanium oxide (TiO 2) are common. Heating the powdered ore with a concentrated solution of NaOH at 473523 K and 3536 bar pressure is used to concentrate it.
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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 with a current output of around 200 mill. t/a is the most . ... The process in use is Crushing, Elutriation (Washing) and ... Concentrate 66
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The process of separating concentrates from bauxite ore is actually a process of removing gangue minerals and harmful impurities, and separating highaluminum minerals and lowaluminum minerals to obtain concentrates with a high aluminumsilicon ratio. ... The bauxite flotation concentrate grade contains % alumina, and the recovery rate is ...
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caustic soda chemical, a large variable cost in the bauxite refining process [3, 6, 8]. Red mud or Bauxite Residue represents a large and ongoing challenge for the aluminum industry [4, 10 11]. Red mud contains significant residual caustic chemical leftover from the refining process, and is highly alkaline, often with a pH of 10±13 [12].
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Baeyer's process is used to concentrate bauxite ore to alumina. Metallurgy (10) 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. Answer (i) Al 2 O 2 O + 2NaOH → 2NaAlO 2 + 3H 2 O (Reaction at 150º200º C)
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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 (a) Define roasting. Name an ore on which roasting is done.
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3 Bauxite. Bauxite is an aluminium ore and is recognised as one of the main sources of aluminium. It typically contains different minerals such as boehmite (γAlO (OH)), gibbsite (Al (OH) 3) and diaspore (αAlO (OH)) mixed with the kaolinite, goethite, hematite, and minor amounts of anatase (TiO 2) and ilmenite (FeTiO 3 or 2) ( Liu et ...
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The ore is dug out from the opencast mines and contains aluminium oxide. The bauxite ore is purified to yield a white powder from which aluminium is extracted. The process of its extraction is done by electrolysis. Usually, bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution at a temperature of 150 to 200°C.
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alumina refinery is tailored to a specific type of bauxite ore. The loss of expensive caustic soda (NaOH) and the generation of red 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 nonAl2O3
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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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The process that is applied to concentrate it is froth floatation process; The concentrated ore is changed to the oxide by heating Zinc blende (ZnS) in the presence of excess air. The reaction is as follows: 13. An ore on being heated in air forms sulphurous anhydride. Write the process used for the concentration of this ore. Solution: The ...
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Concentration, dressing, or beneficiation of ores is the process of removing undesirable particles from ore. There are various steps to it. The variations in physical characteristics of the existing metal complex and that of the gangue are used to separate the needed material from the ore. Gangue is a mineral that contains undesirable elements.
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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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Aluminum in bauxite ore (figure 1) is extracted from the ground and refined to be used in aluminum foil and many other products. ... Geologic processes create and concentrate minerals that are valuable natural resources. Geologists study geological formations and then test the physical and chemical properties of soil and rocks to locate ...
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The main beneficiation methods of bauxite are washing, flotation, magnetic separation, chemical beneficiation, etc. The process of separating concentrates from bauxite ore is actually a process of removing gangue minerals and harmful impurities, and separating highaluminum minerals and lowaluminum minerals to obtain concentrates with a high ...
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Bayer's method: In this method, bauxite powder is taken and concentrated (45%) and sodium hydroxide solution is added and then heated in a closed vessel at 433 K temperature and 5 to 6 bars of pressure, for 6 to 8 hours, so that aluminium oxide present in bauxite is converted into sodium aluminate which is soluble in water. In bauxite, in ...
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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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In the extraction of aluminium ; (i) Name the process of concentration of bauxite. (ii) Write the cathode reaction in electrolytic reduction of alumina. (iii) Write the function and chemical formula of cryolite. ... Note: The Bauxite ore which is used as the initial substrate consists of only 30 60% of alumina rest are mixtures of silica, ...
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The extraction of aluminium from bauxite begins with the crushing of bauxite ore into small particles. After this initial step, bauxite is leached with a hot caustic soda solution in order to separate the alumina and other impurities. The next step involves subjecting the leached product to electrolysis where electricity is used to extract pure ...
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ore; ore deposit; placer; reclamation; Introduction. Some minerals are very useful. An ore is a rock that contains minerals with useful elements. Aluminum in bauxite ore (Figure below) is extracted from the ground and refined to be used in aluminum foil and many other products. The cost of creating a product from a mineral depends on how ...
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Bauxite Al 2 O 2 O; Corundum Al 2 O 3; Cryolite Na 3 AlF 6; Manufacturing Process of Aluminum 1. The Bayer Process: Bauxite, an ore containing aluminum oxide, iron, and other metals, is used to make aluminum. The Bayer process is used for bauxite after being mined, and it is named after the Austrian chemist who invented it in ...
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NonFerrous Metallurgy. Nonferrous metallurgy is the science that investigates how to separate associated elements from nonferrous metal ore, concentrate, secondary resources, or other materials, so as to produce nonferrous metals or their compounds. The 113 elements discovered include 88 metals, 9 semimetals, and 16 nonmetals.
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The ore is first converted into pure aluminum oxide by the Bayer Process, and this is then electrolyzed in solution in molten cryolite another aluminum compound. The aluminum oxide has too high a melting point to electrolyse on its own. The usual aluminum ore is bauxite. Bauxite is essentially an impure aluminum oxide.
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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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