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

How is alumina separated from silica in the bauxite ore associated with silica? Give equations?

(a) What role does cryolite play in Hall Harnoult process ? (b) How can alumina be separated from silica in bauxite ore associated with silica ? Give equation also.

How can you obtain pure alumina from a bauxite ore associated with silica ?

How can you separate a magnetic substance from a mixture?

How can you separate camphor from a mixture of caffeine and camphor?