From NSDL Materials Digital Library Wiki
Electrowinning is the reduction of metals using electrolysis. Most aluminum is produced by the Hall Cell electrowinning process using molten salts at elevated temperatures, as is much magnesium. Aluminum enters the electrowinning cell as an aluminum oxide that has been processed and purified from bauxite ore. Magnesium is often electrowon from molten chloride salt media after processing from ore or brine solution.
Copper is electrowon from aqueous sulfuric acid/copper sulfate solutions using lead alloy anodes. The solution used for copper electrowinning comes from extraction solutions that are concentrated and purified by solvent extraction prior to electrowinning. The electrowinning process produces acid that is used to extract copper from copper minerals.
Categories: aqueous, molten salt, molten oxide, with quite different behavior.
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