zinc leaching with gold
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Zinc cyanide can be a major constituent of the process water due to the cyanide leaching of zinc minerals and the zinc cementation applied to precipitate gold and silver. ... It was found that free cyanide did not depress the flotation of liberated gold, but zinc cyanide with a CN/Zn ratio of 2 did.
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One of the two main types of gold recovery is discussed on this paper. Zinc precipitation has been a widely used method since gold was discovered. Zinc reacts with the cyanide, gold is then filtered off as a solid precipitate.
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