期刊
VACUUM
卷 152, 期 -, 页码 166-172出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2018.02.030
关键词
Chlorine impurity; Titanium sponge; Vacuum distillation
资金
- National Science Foundation of China [51464023]
- Transfer Payment Program of Sichuan Province of China [2017GZYZF0039]
- Science and Technological Talent Cultivation Plan of Yunnan Province, China [2017HB009]
- Scientific Research Item of Pangang Group [2014-PG-C1-008]
- National Key Research and Development Program of China [2016YFC0400404]
Thermodynamics analysis and affecting factors of vacuum distillation on removal of chloride impurities from titanium sponge were studied. The theoretical results show that volatilization ability of Mg,MgCl2, TiCl2 and TiCl3 are very strong under vacuum when distillation temperature is more than 800 degrees C. And chloride impurities could be removed more effectively by improving volatilization rate of MgCl2 at 900 degrees C-1050 degrees C with lower residual system pressure. Experimental results showed that chlorine content in the titanium sponge significantly increased with the increasing of system pressure and chlorine content in magnesium reductant. Meanwhile, the removal of chlorine from titanium sponge was very temperature and distillation time dependent. In addition, the chloride impurities were more difficult to be removed with the decreased porosity of titanium sponge. Finally, optimized parameters for distillation furnace with single batch production capacity of 7.5t titanium sponge were achieved. The chlorine content in final titanium sponge product can be controled at or lower than 0.06 wt% when the distillation temperature, system pressure, and distillation time were 980 degrees C-1000 degrees C, 0.1 Pa-3 Pa and 150 h-157 h respectively. (C) 2018 Elsevier Ltd. All rights reserved.
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