6.2 What is the role of depressant in froth floatation process?

Answers (1)
M manish

Role of depressant in froth flotation method is to separate two sulphid ores by adjusting one ore to form froth. For example- NaCN is used as a depressant it selectively prevents ZnS to coming to the froth but allows PbS with the froth. NaCN react with ZnS to form Na_{2}[Zn(CN)_{4}]

Reaction- 

4NaCN+ ZnS\rightarrow Na_{2}[Zn(CN)_{4}]+ Na_{2}S

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