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Why is the concentration of ore performed?

What is leaching? Explain with an example.

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What is concentration of ore?

The pair of oxides,which can be leached out when powdered bauxite containing certain impurities is digested with a concentrated solution of $NaOH$ at $473-523 \ K$ temperature and $35-36 \ bar$ pressure,are:

How can you separate alumina from silica in bauxite ore associated with silica? Give equations,if any.

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