MetallurgyHard

Question

Why lime stone is added In the extraction of lead from galena ?

Options

A.It prevents the formation of PbSO4.
B.It remove the impurity of silica as fusible slag.
C.It converts lead silicate to lead oxide.
D.It remove the impurity of iron oxide as fusible slag.

Solution

CaO converts the PbSiO3 to PbO, and also prevents the formation of PbSO4.
CaO + SiO2 → CaSiO3 (slag) ; PbO + SiO2 → PbSiO3 ; PbSiO3 + CaO → PbO + CaSiO3

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