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Additional recommended knowledge
The solution is separated from the ore by methods such as filtration and counter current decantation (CCD), and then the gold is cemented by adding zinc dust, which precipitates the gold: zinc has a higher affinity for the cyanide ion than gold.
The basic process was discovered and patented by Charles Washington Merrill around 1900, then later refined by Thomas B. Crowe, working for the Merrill Company.
In more recent years the EMEW technology has started to replace this process through the use of electrowinning
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Merrill-Crowe_process". A list of authors is available in Wikipedia.|