How do we separate two sulphide

Question:

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

Solution:

Two sulphide ores competing to come to the froth can be separated by adjusting the oil to water proportion or by adding a depressant like NaCN. If we have two sulphide ores, ZnS and PbS, NaCN will prevent ZnS from coming to the froth and instead PbS will form the froth. This way the two ores can be separated.

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