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

Answer

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 depresant `NaCN` is used. It forms complex with `ZnS` and prevents it from coming with froth but `PbS` remains with froth.