CHROMIUM REFINING BY VACUUM HEATING AND SUBLIMATION

The feasibility of chromium refining by vacuum heating and subsequent condensation is assessed from calculations and experiments. A vacuum u nit for electron-bean sublimation of chromium is described in which me tallic and gaseous impurities can be removed within a single process. The concentration of gaseous impurities in refined chromium is found t o decrease with increasing condensation temperature, which allows one to obtain material with a total concentration of gaseous impurities be low 10(-3) wt %.