Answer:
It is a substance
which suppresses or depresses the tendency of a particular metal sulphide to
form froth in the froth floatation process by combining with it e.g., NaCN
forms a layer of zinc complex Na2 [Zn(CN)4] on the
surface of ZnS and thereby prevent it from forming the froth.
4NaCN + ZnS
Na2[Zn((N)4]
+ Na2S
Under these
conditions only PbS forms froth and hence can be separated from ZnS ore.
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