A) chemical method
B) froth floatation method
C) magnetic method
D) none of the above
Correct Answer: B
Solution :
All sulphide ores are concentrated by froth floatation method. In this process finely powdered ore, water and pine oil (or fatty acids) are mixed in a tank and agitated. Sulphide ore are wetted by oil particles and are carried to the surface by the foam. The gangue material which is preferentially wetted by water sinks to the bottom.
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