Describe the principle controlling each of the following processes: (i) Preparation of cast iron from pig iron.
Describe the principle controlling each of the following processes:
(i) Preparation of cast iron from pig iron.
(ii) Preparation of pure alumina (Al2O3) from bauxite ore.
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(i) Pig iron is melt with scrap iron and coke using hot air blast. Due to this, impurities such as C, S and P present in the pig iron are removed as CO2, SO2 and P2O5 and carbon content reduced to about 3%.
(ii) Bauxite is soluble in concentrated NaOH solution whereas impurities are not.
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