MetallurgyHard

Question

NaCN is sometimes added in the froth flotation process as a depressant when ZnS and PbS minerals are expected because :

Options

A.Pb(CN)2 is precipitated while no effect on ZnS.
B.ZnS forms soluble complex Na2[Zn(CN)4] while PbS forms froth
C.PbS forms soluble complex Na2[Pb(CN)4] while ZnS forms froth.
D.NaCN is never added in froth floatation process.

Solution

ZnS + 4NaCN → Na2[Zn(CN)4] + Na2S
PbS + NaCN → No such complex formation.

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