Publication Date:
2013-12-07
Description:
Publication date: April 2014 Source: Vacuum, Volume 102 Author(s): Zhiqi Zhang , Zhiqiang Wang , Dehong Chen , Ruiying Miao , Qiong Zhu , Xiaowei Zhang , Lin Zhou , Zong-an Li This paper was aimed at purifying praseodymium by vacuum distillation under two fractions and the purification process of praseodymium was studied. The detailed analysis of purified Pr was obtained by glow discharge mass spectrometry (GDMS) for 35 major impurity elements. High vapour pressure impurities in praseodymium melt, namely Mg, Al, Cr, Mn, Cu, Zn, Pb, Sm, Dy, Ho and Er were obviously reduced after the first distillation carried out at 1300–1400 °C for 4–6 h. The crucible impurity W was drastically reduced, from 209 ppmw to 〈0.05 ppmw, in the distilled praseodymium at a distillation temperature of ∼1700 °C under a dynamic vacuum of ∼2.0 × 10 −4 Pa. According to the actual experimental conditions, the average distillation rate was found to be ∼1.266 × 10 −4 g cm −2 s −1 . Graphical abstract
Print ISSN:
0042-207X
Electronic ISSN:
1879-2715
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
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