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General Principles And Processes Of Isolation Of Elements

Question

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Name three ores which are concentrated by froth-floatation process. What is meant by depressant?

Solution

The three ores which are concentrated by froth-floatation process are:
(i) Copper pyrites (CuFeS₂)
(ii) Zinc Sulphide (ZnS)
(iii) Silver glance (Ag₂S).

Depressants are used to prevent certain types of particles from forming the froth with bubbles.
Example: NaCN is used as a depressant in the separation of ZnS and PbS ore. NaCN forms a layer of Zinc complex Na₂ Zn(CN)₄ on the surface of ZnS and thereby prevents it from formation of froth.

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