Sulphide ores of metals are usually concentra | vedclass

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(D) Froth Floatation Process is generally used for the concentration of sulphide ores based on the differential wetting properties of ore and gangue p

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Argentite

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(D) Froth Floatation Process is generally used for the concentration of sulphide ores based on the differential wetting properties of ore and gangue particles with oil and water.However,$Argentite$ $(Ag_{2}S)$ is an exception as it is concentrated by chemical leaching (MacArthur-Forrest cyanide process).The chemical reactions involved are:$Ag_{2}S + 4NaCN \rightarrow 2Na[Ag(CN)_{2}] + Na_{2}S$Silver is subsequently recovered by displacement using $Zn$:$2Na[Ag(CN)_{2}] + Zn \rightarrow Na_{2}[Zn(CN)_{4}] + 2Ag$

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

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