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Question
Describe the role of the following in the process mentioned.
Sodium cyanide in froth floatation.
Short/Brief Note
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Solution
Sodium cyanide acts as a depressing agent in the froth floatation process. It prevents other metal sulphides from coming to the froth.
eg: NaCN depresses the floatation property ZnS present in Galena (PbS) by forming a layer of Zinc complex Na2[Zn(CN)4] on the surface of Zinc sulphide.
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Chapter 1: Metallurgy - Evaluation [Page 24]
