In electrolytic refining method

In electrolytic refining method, the impure metal is made to act as anode. A strip of the same metal in pure form is used as cathode. They are kept in a suitable electrolytic both containing soluble salt of the same metal. The more basic metal remains in the solution and the less basic ones go to the anode mud.
$$\begin{gathered} \mathrm{Anode} \mathrm{M}⟶{\mathrm{M}}^{\mathrm{n}+}+{\mathrm{ne}}^{-} \\ \mathrm{Cathode} {\mathrm{M}}^{\mathrm{n}+}+{\mathrm{ne}}^{-}\to \mathrm{M} \end{gathered}$$