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What is a depressant ? Give one example....

What is a depressant ? Give one example.

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Compounds which prevent one type of particles, in a mixture, to form the froth are called depressants. For example, NaCN can be used as a depressant for ZnS in the separation of ZnS ore from PbS ore. It forms a layer of zinc complex, `Na_2 [Zn(CN)_4]` on the surface of ZnS and thus prevents it from forming the froth.
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