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Question

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

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Solution

Galena (PbS), Copper pyrite (CuFeS2), and sphalerite (ZnS) are concentrated by the froth flotation process but Argentite (Ag2S) is concentrated using the chemical leaching process and not by the froth floatation method.

Ag2S is an ore of silver. from which silver is extracted using the Mac-Arthur and Forest cyanide process (leaching process).

Ag2S+4NaCN2NaAg(CN)2+Na2S

NaAg(CN)2+ZnNaZn(CN)4+2Ag


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