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What is the role of depressant in froth floatation process?

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Certain sorts of particles are prevented from frothing and generating bubbles by depressants.
As a result, two sulphide ores can be separated.
Sodium cyanide, for example, is a depressant used for ore containing ZnS and PbS.
By forming a layer of the complex Na2 [Zn(CN) 4] on the surface of ZnS, NaCN inhibits it from forming a froth.
It depresses you as a result.
NaCN, on the other hand, does not stop PbS from generating froth and allows it to do so.
Final Answer :
The depressant is used in the froth flotation method to separate two sulphide ores by inhibiting one ore from forming froth and allowing the other ore to cling to the foam.

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