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经理论分析,在1427～1827℃金属钕的饱和蒸气压为4～257 Pa,理论蒸馏速率为2～106 g.cm-2.h-1,具有较高的蒸气压和蒸馏速率,因此真空蒸馏法提纯金属钕在工艺上是可行的;在此基础之上,首次研究了低温范围内(1600～1800℃)金属钕真空蒸馏提纯的工艺技术条件,研究表明:在1650～1700℃,金属钕的实际蒸馏速率可达到3～3.9 g.cm-.2h-1,工业级的粗金属钕经过一次蒸馏提纯杂质去除率最高可达80%以上,并利用该法制备得到了目前国内报道最高纯度的金属钕,Nd绝对纯度达99.951%(质量分数)(分析35个杂质元素,按差减法计算),Nd相对纯度达99.9817%,O≤20μg.g-1,C≤51μg.g-1;从而证实真空蒸馏法是一种简单、高效、提纯效果好的高纯金属钕工业制备方法。
According to the theoretical analysis, the saturated vapor pressure of Nd at 1427 ~ 1827 ℃ is 4 ~ 257Pa, the theoretical distillation rate is 2 ~ 106g.cm-2.h-1, and has high vapor pressure and distillation rate. Therefore, Distillation purification of metal neodymium is technically feasible. On this basis, the technical conditions of vacuum purification of neodymium metal in the low temperature range (1600-1800 ℃) are studied for the first time. The results show that at 1650-1700 ℃, The actual distillation rate of neodymium can reach 3 ~ 3.9g.cm-.2h-1, industrial grade crude metal neodymium after a distillation purification impurity removal rate up to 80% or more, and the use of the method of preparation has been reported at home the highest Purity of neodymium, Nd absolute purity of 99.951% (mass fraction) (analysis of 35 impurity elements, calculated by subtraction), Nd relative purity of 99.9817%, O ≤ 20μg.g-1, C ≤ 51μg.g-1 ; Thus confirms the vacuum distillation method is a simple, efficient, good purification of high purity neodymium metal industrial preparation.