Occurrence Of Metals

Bessemer converter is used for preparation of steel. The iron obtained from blast furnace is impure or pig iron it is then undergo bessemerisation. This process is based on the fact that the impurities present in the pig iron are completely oxidised to from almost pure wrought iron. It is then mixed with known amount of spiegeleisen (an alloy of and ) to obtain steel

(a) Calamine ore of zinc (b) Cryolite ore of aluminium (c) Cassiterite ore of tin (d) Malachite . ore of copper

Polling is used for purification of metal which contain their own oxide as impurity. eg. in