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How do we separate two sulphide ores by ...

How do we separate two sulphide ores by Froth Floatation Method? Explain with an example.

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Two sulphide ores can be separated by adjusting proportion of oil to water or by using depressants. For example, in the case of an ore containing ZnS and PbS, the depressant NaCN is used. It forms a layer of zinc complex `Na_2 [Zn(CN)_4]` on the surface of ZnS and therefore, prevents it from forming the froth. Therefore, it acts as a depressant.
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MODERN PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-NCERT FILE (Ncert Exemplar Problems) (Short Answer Type Questions)
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