Electrolytic purification by transferring the desired metal from an impure dissolving anode to a purer cathode. Impurities can stay dissolved, remain as solids or form precipitated anode slime. Potential control, transport and exclusion of solid contamination are as important as tabulated standard potentials.
Solid residue formed or collected during anodic dissolution in electrorefining. It can contain noble metals, precipitated salts and undissolved inclusions. Slime can retain valuable impurities, block transport or contaminate a deposit by entrainment.
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