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General Principles And Processes of Isolation Of Elements
Question
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Name the chief ores of tin, iron and aluminium. What methods are employed for the concentration/purification of their ores?

Answer

(i) The chief ore of tin is cassiterite (SnO2). It is crushed and then concentrated by hydraulic washing. Tungstate of iron and manganese present are removed by magnetic process.

(ii) The chief ore of iron is haematite (Fe2O3). It is crushed and then concentrated by hydraulic washing.

(iii) The chief ore of aluminium is bauxite  AlOx(OH)3-2x [where 0 < x < 1] . It is concentrated by leaching method.

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