What is the role of a depressant in the froth | vedclass

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Question

(B) In the froth flotation process,the role of the depressants is to separate two sulphide ores by selectively preventing one ore from forming froth.F

Vedclass · Accepted Answer

To selectively prevent one sulphide ore from forming froth.

Vedclass · Answer

(B) In the froth flotation process,the role of the depressants is to separate two sulphide ores by selectively preventing one ore from forming froth.For example,to separate two sulphide ores ($ZnS$ and $PbS$),$NaCN$ is used as a depressant which selectively allows $PbS$ to come with the froth,but prevents $ZnS$ from coming to the froth.This happens because $NaCN$ reacts with $ZnS$ to form the soluble complex $Na_2[Zn(CN)_4]$.$4NaCN + ZnS \longrightarrow Na_2[Zn(CN)_4] + Na_2S$

What is the role of a depressant in the froth flotation process?

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