THE THERMODYNAMIC AND PROCESS OF PREPARATION OF HIGH PURITY CALCIUM BY VACUUM DISTILLATION

In this paper,the thermodynamics and dynamics of the preparation of high purity calcium by vacuum distillation are calculated in detail.The pre-distillation and distillation process are studied to determine the optimized process of preparation of high purity calcium by vacuum distillation.The pre-distillation and distillation parameters are respectively 700 ℃,40 minutes.and 850 ℃,60 minutes.It is effective to prevent the vacuum distillation products from being polluted by electroplated coating of Cr on the inner wall of the distillation unit.The 99.998% high purity calcium can be obtained by the vacuum distillation once.