Refinement of fusible metals (Ga, Cd, Zn, Te, Pb, In at al) to the purity level >(6N) have been realized combining vacuum heat treatment, filtration and distillation in a single cycle. The techniques correspond to the staged removal of volatile impurities with filtration and fine cleaning of low-volatile contaminations using a getter filter. It provides better disposal of metallic admixtures, as well as interstitial impurity (N, O, C) from cadmium, zinc and tellurium to the level 1·10 ^-5 % mass.

              These technologies can be combined with crystallisation methods.