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Processing, smelting and refining gold | World Gold Council

Processing, smelting and refining gold | World Gold Council

TheMiller processis rapid and simple, but it producesgoldof only about 99.5 percent purity. TheWohlwill processincreases purity to about 99.99 percent by electrolysis. In this process, a casting of impure gold is lowered into an electrolyte solution of hydrochloric acid andgold chloride.

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