WEBName the method of concentration of haematite ore and explain the method. Solution. Verified by Toppr. Haematite ore is concentrated by gravity separation or hydraulic washing. The powdered Haematite ore is concentrated by washing in a current of water. The lighter gangue particles are carried away leaving behind the heaviest ore.
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WEBAug 23, 2023 · From bauxite to alumina: the chemical transformation is a remarkable journey that brings forth a versatile material used in various industries. To begin, the refining process starts with bauxite, a mineral rich in aluminum oxide. This mineral is carefully extracted from the earth and transported to refineries.
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WEBDec 14, 2022 · Ferric oxide and silica are normally present as impurities in bauxite. Bauxite ore is dressed by crushing and pulverizing. Magnetic separation is used to remove ferric oxide impurities from bauxite. Hall's method is used to concentrate the ore. Charles Martin Hall, an American chemist, invented the hall method of concentrating bauxite in .
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WEBThe 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 30–60% 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 .
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WEBIn 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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WEBNov 1, 2013 · Table 1 shows the feed ore characteristics of diasporicbauxite flotation process, where A/S for feed grade refers to the mass ratio of AL 2 O 3 and SiO 2 of feed grade. It is a key indior to measure the bauxite quality. Pulp concentration uses the percentage concentration (%), the percentage of solids contained in the slurry.
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WEBView Solution. Q 5. Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction. (a) Write three balanced equations for the purifiion of bauxite by Hall's process. (b) Name a chemical used for dissolving aluminium oxide.
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WEBQ. Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction. (a) Write three balanced equations for the purifiion of bauxite by Hall's process. (b) Name a chemical used for dissolving aluminium oxide.
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WEBThe principal raw material for alumina production is bauxite Al 2 O(OH) 4, an abundant hydrated rock occurring as large deposits in various parts of the world. 2 In the Bayer process, prepared bauxitic ore is digested under pressure in a hot aqueous solution of sodium hydroxide and then 'seeded' to induce precipitation of Al(OH) 3 crystals ...
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WEBSolution. Verified by Toppr. Correct option is A) Froth Floatation process is used for the purifiion of metals containing sulphur. Chalcopyrite contains sulphur that's why it is concentrated by froth floatation process. Solve any question of General Principles and Processes of Isolation of Elements with:.
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WEBNov 5, 2018 · 2. Bayer process alumina production. Bauxite ore is the main raw material used in alumina production. The alumina production in major regions of the world in 2017 is shown in Figure 1. It can be seen that the growth in aluminum production continues to be driven by countries in Asia and the Gulf area, 2017 global aluminum production is nearly ...
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WEBJun 5, 2024 · Complete answer: 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 .
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WEBJun 5, 2024 · > The method used for the concentration of aluminium ore is: To extract the aluminium from the bauxite ore leaching process is used. The leaching process is based on difference solubility ore and other impurities. In this process, insoluble impurities can easily be separated from soluble ore. For the industrial purpose, the Bayer process is ...
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WEBNov 16, 2021 · (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 .
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WEBSolution. 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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this method, the powdered bauxite ore is soaked in aqueous Na2CO3 which dissolves the main ingredient of ore, alumina to form soluble sodium aluminate. The undissolved gangue that is left behind is filtered off. underset"Aluminium oxide"(Al2O3. 2H2O"(s)") + underset"Sodium carbonate"(Na2CO(3"(aq)")) to underset"Sodium .
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WEB(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 aluminum oxide for the electrolytic extraction of aluminum is obtained by heating aluminium hydroxide.
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WEBNov 4, 2022 · Thus we obtain the product of the actual Bayer process: the aluminium oxide trihydrate Al 2 O 3 – H 2 O, or aluminium hydroxide Al (OH) 3 – both terms and both formulae are chemically correct. In analogy to the use in practice, we will use both terms. Aluminium hydroxide contains from 60% to 65% aluminium oxide, a small proportion of .
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WEBJan 1, 2002 · A new process of Al2O3 production from lowgrade diasporic bauxite based on the reactive silica dissolution and stabilization in concentrated NaOHNaAl(OH)4 solutions is proposed and proved feasible.
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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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WEBA process that involves treatment of ore with lime and soda is used in China and Russia. The Bayer process involves four steps: digestion, clarifiion, precipitation, and calcination. In the first step, bauxite is ground, slurried with a solution of caustic soda ( sodium hydroxide ), and pumped into large pressure tanks called digesters ...
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WEBJul 31, 2023 · Ore Concentration The bauxite ore contains impurities like ferric oxide and silica. Gravity separation is used to remove silica from the crushed ore, and magnetic separation is used to separate ferric oxide impurities from the ore. The ore is then concentrated using a chemical process. Bauxite is the name given to aluminium ore.
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WEBQ. Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction. (a) Write three balanced equations for the purifiion of bauxite by Hall's process. (b) Name a chemical used for dissolving aluminium oxide. In which state of subdivision is the chemical used?
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WEBJan 15, 2021 · By reverse flotation of the ore, a highgrade bauxite concentrate with A/S ratio was obtained, however the Al 2 O 3 recovery remained low at %. Although the A/S rate achieved by the flotation was adequate for the Bayer process, Al 2 O 3 recovery was considered to be low for flotation process. It was deduced that the .
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WEBDec 29, 2022 · Contact Now +. Published time：29 December 2022. Bauxite is an aluminumcontaining mineral, and its main components include aluminum hydroxide, boehmite, diaspore, goethite, hematite, quartz, etc. Bauxite is formed from the parent rock in hot and humid climates. Its color is grayishwhite, brownred, and .
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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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WEBFeb 3, 2024 · With increasing amount of high silica bauxites used as Bayer refinery feed, the reprecipitation of dissolved silies results in greater volumes of desiliion product (commonly known as DSP) which corresponds to elevated caustic consumption and issues with bauxite residue neutralisation and storage.
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WEBJan 1, 2016 · The Bayer process for alumina production generates more than 160 million tons of bauxite residue annually. The current global stockpiles of bauxite residue have reached more than 4 billion tons ...
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WEBFeb 24, 2021 · Bauxite residue (BR) is a caustic redcolored byproduct of the Bayer process for alumina (Al 2 O 3) extraction from bauxite ore, generated in a proportion ranging from to (alumina: BR).. BR may have distinguished particle's size distribution varying from sand (+100 μm) to fine particles (−150 μm) depending on the .
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WEBConcentration of ore is a step involved in the process of extraction of metal from its ore. Unwanted rocks and grit are eliminated from mineral ore in this process. Hydraulic washing, froth floatation process, magnetic separation and chemical separation are some of the techniques used for concentrating or purifiion of ores. Hydraulic washing:
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