Outotec Electro-refining Process provides user friendly, environmentally sound and optimized solutions for purifying the anode copper produced in copper smelters.  Copper anodes are dissolved in the process and pure copper is deposited from copper sulphate solution on to cathodes. Precious metals remaining in the anode slime are refined in the precious metals processes. The Outotec Electro-refining Process is based on our advanced proprietary equipment.