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Question

Which one of the following ores is best concentration by forth-flotation method?

A
Malachite
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B
Cassiterite
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C
Galena
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D
Magnetite
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Solution

The correct option is C Galena
Froth floatation method is used to remove gangue from sulphide ores​.
Galena (ZnS) is a sulphide ore.
Magnetite (Fe3O4) is an ore of iron. Malachine [Cu2CO3(OH)2] is an ore of copper and cassiterite (SnO2) is an ore of tin. Hence, only galena contains sulphide ion, thus it is best concentrated by froth floatation method.

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