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在镁热还原法生产海绵锆的过程中,由还原炉中得到的海绵锆混有氯化镁及残余的镁。在正常情况下,真空蒸馏一次就可以把这两种杂质清除掉。但是实际生产中由于多种因素的影响,常常出现杂质元素氯、镁过量而造成废品的情况。据某厂连续生产九个月的统计,因氯、镁元素过量而造成的废品占28.5％。把这类不合格的海绵锆进行第二次真空蒸馏处理,在工厂中称之为“返蒸”。生产上常常出现这样的情况:经过返蒸后的海绵锆,氯、镁的含量合格,但气体杂质氧、氮的含量却又过高,成为废品。为解决这个问题,探讨合理的返蒸工艺是十分必要的。
During the production of sponge zirconium by the magnesium reduction method, the sponge zirconium obtained from the reduction furnace is mixed with magnesium chloride and residual magnesium. Under normal circumstances, vacuum distillation once can remove these two impurities. However, the actual production due to many factors, often appear impurity elements chlorine, magnesium caused by excessive waste situation. According to a factory for nine months of continuous production statistics, due to excessive chlorine and magnesium elements caused by waste accounted for 28.5%. The unqualified sponge zirconium for the second vacuum distillation, in the factory called “return steaming.” Production often appear such a situation: after steaming sponge zirconium, chlorine, magnesium content pass, but the gas impurities oxygen, nitrogen content is too high, as waste. In order to solve this problem, it is necessary to explore a reasonable steaming process.