Which method is used to refine impure metals?

Answer:

Electrolytic refining method is used to refine impure metals.

Electrolytic refining

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.

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