explain leaching of alumina from bauxite
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In the extraction of aluminium, the significance of leaching is to concentrate pure alumina(AL2O3) from bauxite ore. Bauxite usually contains silica, iron oxide, and titanium oxide as impurities. In the process of leaching, alumina is concentrated by digesting the powdered ore with a concentrated solution of NaOH at 473-523K and 35-36 bar. Under these conditions, alumina dissolves as sodium silicate leaving the impurities behind. The impurities are then filtered and the solution is neutralised by passing CO2 gas. In this process, hydrated AL2O3 gets precipitated and sodium silicate remains in the solution. Precipitation is induced by seeding the solution with freshly prepared samples of hydrated AL2O3. Hydrated alumina thus obtained is filtered , dried and heated to give back pure alumina(Al2O3).
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HERE IS YOUR ANSWER ⤵
In the extraction of aluminium, the significance of leaching is to concentrate pure alumina(AL2O3) from bauxite ore. Bauxite usually contains silica, iron oxide, and titanium oxide as impurities. In the process of leaching, alumina is concentrated by digesting the powdered ore with a concentrated solution of NaOH at 473-523K and 35-36 bar. Under these conditions, alumina dissolves as sodium silicate leaving the impurities behind. The impurities are then filtered and the solution is neutralised by passing CO2 gas. In this process, hydrated AL2O3 gets precipitated and sodium silicate remains in the solution. Precipitation is induced by seeding the solution with freshly prepared samples of hydrated AL2O3. Hydrated alumina thus obtained is filtered , dried and heated to give back pure alumina(Al2O3).
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Alumina is separated from bauxite by chemical separation method. This process is based in the difference in the chemical properties of the ore and gangue . In this process the ore is changed into a form that can be easily separated from impurities or gangue . Bauxite which is ore of aluminum is separated by removing impurities. Bauxite ore is reacted with concentrated NaOH solution in autoclave at 150 degree Celsius temperature. In this process bauxite is dissolved in concentration NaOH solution and insoluble impurities left behind and these impurities are removed by filtration .
In this process various reactions are involved
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In this process various reactions are involved
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