The metal usually refined by liquation is

Liquation process :- This process is based on the difference in fusibility of the metal and impurities. 

When the impurities are less fusible than the metal itself, this process is employed. The impure metal is placed on the sloping hearth of a furnace and gently heated. The metal melts and flows down leaving behind the impurities on the hearth.
This method is used to purify the metals like Bi, Sn, Pb,  etc.