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  • is sometimes added in the froth floatation process as a depressant when mineral contains <img alt="ZnS" src="https://learn.ca

NaCN is sometimes added in the froth floatation process as a depressant when mineral contains ZnS and PbS because,

Option: 1

 Pb(CN)_{2} is precipitated while there is no effect on ZnS.
               


Option: 2

ZnS forms soluble complex Na_{2}[Sn(CN)_{4}] while PbS forms froth              


Option: 3

PbS forms soluble complex Na_{2}[Pb(CN)_{4}]  while ZnS  forms froth.             

              


Option: 4

silicious impurities settle down on the bottom.


Answers (1)

best_answer

 

Froth floatation process -

This method is mainly for the concentration of sulphide ores.The method is based on the different wetting characteristics of the gangue and the sulphide ore with water and oil  

- wherein

The gangue preferentially wetted by water and the ore by oil.

 

 

 

ZnS+4NaCN\rightarrow Na_{2},[Zn(CN)_{4}](Soluble \; complex)+Na_{2}S.

Hence, the option number(2) is correct.

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Sayak

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