Sulphide ores of metal are usually concentrated by froth floatation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?

Galena

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Copper pyrite

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Sphalerite

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Argentite

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Solution

The correct option is D Argentite
Leaching process involves the treatment of the ore with a suitable reagent as to make it soluble while impurities remain insoluble. The ore is recovered from the solution by suitable chemical method. Argentite or silver glance, $A g_{2} S$ is an ore of silver. Silver is extracted from argentite by the Mac-Aurthur and Forest cyanide process (leaching process).

$A g_{2} S + 4 N a C N \to 2 N a A g (C N)_{2} + N a_{2} S$

$2 N a A g (C N)_{2} + Z n \to N a_{2} Z n (C N)_{4} + 2 A g$

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The ore which is not concentrated by froth floatation but concentrated by leaching ? Exception to froth flotation .

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