NaCN is sometimes added in the froth flotatio | vedclass

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(B) depressant is a substance added to the froth flotation process to selectively prevent one mineral from forming a froth.In the case of a mixture of

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$ZnS$ forms soluble complex $Na_2[Zn(CN)_4]$ while $PbS$ forms froth

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(B) depressant is a substance added to the froth flotation process to selectively prevent one mineral from forming a froth.In the case of a mixture of $ZnS$ and $PbS$,$NaCN$ acts as a depressant for $ZnS$.It reacts with $ZnS$ to form a soluble complex,$Na_2[Zn(CN)_4]$,which prevents $ZnS$ from forming a froth.The chemical reaction is: $ZnS + 4NaCN \rightarrow Na_2[Zn(CN)_4] + Na_2S$.Consequently,$PbS$ is left to form the froth,allowing for the separation of the two minerals.

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

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