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Question

Name the chief ore of lead. Write the steps involved in the extraction of lead from its sulphide ore by the self-reduction process. Give balanced equations wherever necessary.

Solution

Galena PbS

Extraction of Pb. from Galena (PbS)

Self reduction process : It involves the following step :

(i) Concentration : Ore is crushed, findely powdered and then concentrated by froth floatation process.

(ii) Roasting : Concentrated ore is roasted in the presence of air.
2PbS(s) +3O₂ --> 2PbO(s) +2SO₂(g)
PbS(s) 2O₂(g) --> PbSO₄(g)

(iii) Reduction : Supply of air is cut-off at this stage. More galena is added, temperature is raised to melt the charge when galena reduces both oxide and sulphate to metallic lead.
2PbO(s) +PbS(s) ---> 3Pb(l) +SO₂(g)
PbSO₄(s) +PbS(s) ---> 2Pb(l) +2SO₂(s)

Molten lead is obtained.

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