1.

Describe the role of the following :(i) SiO2 in the extraction of copper from copper matte.(ii) NaCN in froth floatation process.

Answer»

(i) It acts as flux to removiron oxide as silicate (slag).

FeO + SiO2  FeSiO3 (Slag)

(ii) NaCN acts as the depressant. It selectively prevents ZnS from coming to the froth but allows pbs to came with the froth.



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