What is a depressant? Give one example.

1 Answer

Answer :

Ans. Compounds which prevent the formation of froth in froth flotation process are called depressants. For example, NaCN can be used as a depressant for ZnS in the separation of ZnS from PbS ore. It forms a layer of Zinc complex, Na2[Zn(CN)4] on the surface of ZnS and thus prevents it from forming the froth. 

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