Question

Which refining process is generally used in the purification of low melting metals ?

Answer 1

Liquation is used for the refining of metals having low melting point and are associated with high melting impurities . For example $Pb,Sn,Sb,Bi$ and $Hg$ .
THe impure metal is heated on the sloping hearth of a furnance . The pure metal flows down leaving behind the non-fusible material on the hearth .