Abstract
For a fundamental datum for refining crude Se by distillation, the vapour pressure of Se alloys containing another element was determined with the following results:
(a) The vapour pressure of Se-Sn and Se-Bi alloys decreases with the increase of Sn or Bi content, but each system has a monovariant range in its isobaric and isothermal diagram.
(b) The isobar and isotherm of Se-Te alloy show the minimum and maximum respectively, therefore separation of Te by distillation is difficult. (c) Se-Hg alloy is difficult to be separated due to high vapour pressure of the intermetallic compound (Hg. Se) which exists in this system. (d) The vapour pressure of Se-S alloy increases monotonously with increasing of S content. (e) Se-Cd alloy contains the intermetallic compound (Se•Cd) having low vapour pressure, so that it is possible to remove Cd from Se by distillation. Se-Zn alloy is similar to Se-Cd alloy. (f) Spectrographic examination of distillated Se was also carried out.
