Sodiumcyanideis sometimesaddedinthefrothfloatationprocess asa depressa – InterviewSolution

1.	Sodiumcyanideis sometimesaddedinthefrothfloatationprocess asa depressantwhen the ore contains amixtureofZnS +PbS because
Answer» Pb `(CN)_2 `getsprecipitatedwithoutanyeffecton ZNS ZnS fromssolublecomplex, `Na_2 [Zn(CN)_4] `while PBS formsthe froth PbS formssolublecomplex,` Na_2[Pb(CN)_4]`while ZnS formsfroth ` Zn(CN)_2 `getsprecipitatedwithoutany EFFECTON PbS. Answer :B

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