Question

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

Answer 1

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 complex with ZnS and prevents it from coming with froth but PbS remains with froth.