Pre Activation of Cyanide Depressed Sphalerite

Copper activation of cyanide depressed sphalerite can be split into two steps (a) decomposition of zinc cyanide on the surface of sphalerite by copper ions (b) chemisorption of copper on sphalerite. Decomposition of zinc cyanide may also be achieved by aldehydes/chloralhydrate instead of copper ions.

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