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

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The separation of two sulphide ores is done by adjusting proportion of oil to water or by using depressants. NaCN is used  for an ore containing ZnS  and PbS. Sodium cyanide forms complex with ZnS and prevents it from coming with froth but lead sulphide remains with froth.

4NaCN+ZnS\rightarrow Na_{2}Zn(CN)_{4}+Na_{2}S

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