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NaCN is sometimes added in the front loa...

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

A

`Pb(CN)_(2)` is precipitated while no effect on ZnS

B

ZnS forms soluble complex `Na_(2) Zn(CN)_(4)]` while Phs comes out with froth

C

PbS forms soluble complex `Na_(2) [Pb(CN)_(4)]` while ZnS comes out with froth

D

NaCN is never added in froth floatation process

Text Solution

Verified by Experts

The correct Answer is:
B
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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