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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?

Answer: NaCN act as a depressant in preventing ZnS from forming the froth but not for PbS . When an ore containing PbS and ZnS is subjected to froth floatation process only PbS form froth and can be separated.

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