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How pure can cathode copper become after electrorefining?
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copper processing
Molten copper being made into plates.
After the process of electrorefining, cathode copper can achieve a very high level of purity. Both electrorefining and electrowinning are capable of producing cathode copper with a purity exceeding 99.9 percent. Furthermore, the final refining stage in copper processing is specifically designed to remove the remaining traces of impurity elements, resulting in a product that reaches 99.99 percent purity.12