Removal of low-volatile impurities from magnesium by sublimation

The sublimation refining of magnesium with initial Fe, Ni, Cu, Si, and Al contents from ∼10 −3 to 10 −2 % at temperatures from 700 to 800 K with a 80% degree of distillation reduces the impurity concentrations by one to two orders of magnitude in the first process and by an additional order of magnitude in a second cycle. The effective separation factor α found using the main distillation equation is on the order of 10 for the impurities and processes in question.