What are depressants ? How would you sepatate Zinc sulphide (ZnS) and – InterviewSolution

1.	What are depressants ? How would you sepatate Zinc sulphide (ZnS) and lead sulphide (PbS) ores?
Answer» Depressants are the chemicals which are used for preventing certain type of particles from forming the froth. Zinc sulphide ore can be separated from lead sulphide ore by froth floatation process using sodium cyanide (NaCN) as depressant. Sodium cyanide act as depressants for ZnS but does not prevent PbS from the formation of froth. Thus, the two ores can be separated.

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