1.

NaCN is sometimes added in the front loatation process as a depressant when ZnS and PbS minerals are expected because

Answer»

`Pb(CN)_(2)` is precipitated while no effect on ZnS
ZnS forms SOLUBLE complex `Na_(2) Zn(CN)_(4)]` while Phs COMES out with froth
PbS forms soluble complex `Na_(2) [Pb(CN)_(4)]` while ZnS comes out with froth
NaCN is never added in froth floatation process

Solution :In the CONCENTRATION of Galena ore NaCN is added as depresent for Zns, NaCN forms layer of Zinc complex `Na_(2)[Zn(CN)_(4)]` on the surface of ZnS and prevent it from the formation of froth and Pbs forms froth.


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