How can we obtain pure alumina, Chemistry

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Q. How can we obtain Pure alumina?

Pure alumina is obtained from bauxite ore. Powdered bauxite mineral is heated in a concentrated solution of sodium hydroxide under pressure when alumina and silica get dissolved:

Al203 + 2NaOH + 3H20---------------------------------> 2 NaAI(OH)4

Si02 + 2NaOH ------------------------------------------> Na2Si03 + H20


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