Question

The role of depressants in froth floatation method is to ______.

विकल्प

• 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.

Answer 1

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.