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  • The role of depressants in 'Froth Floation method' is to Option: 1 selectively prevent one component of the ore from coming to the froth

The role of depressants in 'Froth Floation method' is to 

Option: 1

selectively prevent one component of the ore from coming to the froth.


Option: 2

reduce the consumption of oil for froth formation.


Option: 3

stabilize the froth.


Option: 4

enhance non-wettability of the mineral particles.


Answers (1)

best_answer

The role of depressant is to selectively prevent one component of the ore from coming to the froth.

For example, NaCN is used as a depressant in the separation of ZnS from PbS. It selectively forms a complex with ZnS forming the tetracyanozincate(II) complex while PbS is unaffected.

\mathrm{ZnS + 4~NaCN \longrightarrow Na_2[Zn(CN)_4]+ Na_2S}

Hence, answer is Option(1)

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