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Question
The role of depressants in froth floatation method is to ______.
Options
Selectively prevent one component of the ore from coming to the froth.
Reduce the consumption of oil for froth formation.
Stabilize the froth.
Enhance non-wettability of the mineral particles.
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Solution
The role of depressants in froth floatation method is to selectively prevent one component of the ore from coming to the froth.
Explanation:
In the froth flotation process, depressants are used to selectively prevent one sulphide ore from forming froth while allowing another to rise. For example, in a mixture of PbS (galena) and ZnS (zinc blende), NaCN acts as a depressant. It forms a soluble complex with ZnS, preventing it from coming to the froth, while PbS forms the froth and gets separated.
