How does NaCN act as a depressant in preventing ZnS from forming the froth ?

How does NaCN act as a depressant in preventing ZnS from forming the froth ?
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Answer :

Ans. NaCN forms a layer of zinc complex, Na2 [Zn (CN)4 ] on the surface of ZnS and thereby prevents it from the formation of froth.
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Last Answer : When ZnS and PbS minearls are present together, then NaCN is added to separate them in the froth ... ]` D. They cannot be separated by adding NaCN

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