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

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Solution

Galena ( $P b S$ ), Copper pyrite ( $C u F e S_{2}$ ), and sphalerite (ZnS) are concentrated by the froth flotation process but Argentite ( $A g_{2} S$ ) is concentrated using the chemical leaching process and not by the froth floatation method.
$A g_{2} S$ is an ore of silver. from which silver is extracted using the Mac-Arthur and Forest cyanide process (leaching process).
$A g_{2} S + 4 N a C N ⟶ 2 N a A g {(C N)}_{2} + N a_{2} S$
$N a A g {(C N)}_{2} + Z n ⟶ N a Z n {(C N)}_{4} + 2 A g$

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