Question

What is the role of depressants in froth floatation method?

Answer 1

Answer:

Depressent helps to seperate two suphide ores.

Answer 2

Answer:

In froth floatation process, the role of the depressant is to prevent froth floatation of unwanted particles .

$\huge\fbox\pink{ For \: Example \: :- }$

• NaCN is used as a depressant to seperate lead sulphide (PbS) from Zinc sulphide (ZnS). NaCN forms a zinc complex ${Na}_{2}$ [Zn${CN}_{4}$ ] on the surface of ZnS .
• Thereby preventing it from the formation of froth. Under those conditions, only PbS forms froth and hence can be separated from ZnS ore.

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