Electrolytic refining method is used to refine impure metals.
Electrolytic refining is a technique that is used for the extraction and purification of metals that are obtained by refining methods.
- The impure metal is used as an anode and the pure metal is used a cathode. Soluble salt from the same metal is used in an electrolyte.
- When an electric current is passed, pure metal gets deposited at the cathode and the impure metal gets dissolved from the anode.
- Impurities from the metal gets collected below the anode and is known as anode mud.
- In the electrolytic refining impurities such as gold, silver, platinum group metals, arsenic, selenium, and tellurium are recovered.