Cementation (metallurgy)
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Cementation is a heterogeneous process in which ions are reduced to zero valence at a solid metallic interface. The process is often used to refine leach solutions.
Cementation of copper is a common example. Copper ions in solution, often from a ore leaching process, are precipitated out of solution in the presence on solid iron. The iron oxidizes, and the copper ions are reduced through the transfer of electrons.
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