Vacuum distillation refining of metallurgical grade silicon (Ⅰ) ——Thermodynamics on removal of phosphorus from metallurgical grade silicon

摘要：

The removal of impurity phosphorus from metallurgical grade silicon is one of the major problems on purification of metallurgical grade silicon for solar grade silicon preparation.The thermodynamics on vacuum refining process of the metallurgical grade silicon was studied via separation coefficient of impurity phosphorus in the metallurgical grade silicon and vapor-liquid equilibrium composition diagram of Si-P binary alloy at different temperatures.The behaviors of impurity phosphorus in the vacuum distillation process were examined.The results show that the vacuum distillation should be taken to obtain silicon with less than 107 P,and the impurity phosphorus is volatilized easily by vacuum distillation in thermodynamics.Phosphorus is distilled from the molten silicon and concentrated in vapor phase.

关键词： metallurgical grade silicon solar grade silicon refining vacuum distillation thermodynamics phosphorus removal

作者: WEI Kui-xian MA Wen-hui DAI Yong-nian YANG Bin LIU Da-chun WANG Jing-fu

作者单位: National Engineering Laboratory for Vacuum Metallurgy,Faculty of Materials and Metallurgical Engineering,Kunming University of Science and Technology,Kunming 650093,China;Laboratory of Vacuum Metallurgy of Non-ferrous Metals of Yunnan Province,Kunming 650

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）