The Wohlwill process increases purity to about 99.99 percent by electrolysis. In this process, a casting of impure gold is lowered into an of hydrochloric acid and gold chloride. Under the influence of an electric current, the gold migrates to a negatively charged electrode cathode, where it is restored to a highly pure metallic state, leaving the impurities as a separate solution or residue.
Hot Crushers Brief Introduction
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