Question

How do we separate two sulphide ores by froth floatation method?

• A. By using excess of pine oil
• B. By adjusting proportion of oil to water or using depressant
• C. By using collectors and froth stabilisers like xanthates
• D. By using some solvent in which one of the sulphides is soluble

Answer 1

Answer: (B)

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 duringfroth floatation. It forms a complex with ZnS and prevents it from coming into froth.