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

Explanation

Two sulphide ores can be seperated by adjusting the proportion of oil and water or by using depressants, e.g., if an ore contains ZnS and PbS both, a depressant NaCN is added during froth floatation. It forms a complex with ZnS and prevents it from coming into froth. PbS comes into the froth and thus seperated .