Precipitation Phase and Impurities Distribution of Metallurgical Grade Silicon by Vacuum Refining Followed Slag Treatment
Precipitation phase and impurities distribution of MG-silicon were investigated by vacuum refining followed by slag treatment, and the CaO-SiO2-CaF2 system was adopted for slag treatment.Contrasting the microstructure of precipitated phase in slag treatment with and without vacuum refining pretreated, it could be concluded that the composition of precipitated phases, obtained in MG-Si after vacuum refining followed slag treatment, only consisted of Ca-rich intermetallic silicide phases such as Si-Ca-Ni, Si-Ca-Fe and main impurity phase Si-Ca.And the vacuum refining could make an increase in concentration of the impurity Ti due to its low saturated vapor pressure and silicon loss, which was in favor of the interaction with the impurity B, resulting in the formation of TiB2 that could stay at the slag.Consequently, the vacuum refining could be regarded as an effective method for facilitating the removal of B from MG-Si with slag treatment.
Metallurgical grade silicon vacuum refining slag treatment precipitation phase impurities distribution
Huixian Lai Xuetao Luo Liuqing Huang Ming Fang Chenghao Lu Juan Chen Deqin Yu Jintang Li Wenhui Ma Jianning Shen
Department of Materials Science and Engineering,Xiamen University,Xiamen 361005,P R China National Engineering Laboratory for Vacuum Metallurgy,Faculty of Materials and Metallurgical Enginee Ningxia Electrical Power Ltd.Co,Yinchuan,750002,P R China
国际会议
香港
英文
492-496
2013-06-25（万方平台首次上网日期，不代表论文的发表时间）