欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2015, Vol. 15 ›› Issue (3): 393-399.DOI: 10.12034/j.issn.1009-606X.215175

• 反应与分离 • 上一篇    下一篇

复合熔析精炼去除工业硅中的非金属杂质硼

杜冰 王志 孙丽媛 马文会 葛治 陈杭   

  1. 昆明理工大学冶金与能源工程学院 中国科学院过程工程研究所 中国科学院过程工程研究所，湿法冶金清洁生产技术国家工程实验室 昆明理工大学冶金与能源工程学院 中国科学院过程工程研究所 江西理工大学冶金与化学工程学院
  • 收稿日期:2015-03-30 修回日期:2015-04-21 出版日期:2015-06-20 发布日期:2015-06-20
  • 通讯作者: 杜冰

Removal of Boron Impurity from Metallurgical Grade Silicon by Composite Solvent Refining

DU Bing WANG Zhi SUN Li-yuan MA Wen-hui GE Zhi CHEN Hang   

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Institute of Process Engineering, Chinese Academy of Sciences National Eng. Lab. Hydrometall. Cleaner Production Technol.,Inst. Process Eng.,CAS Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology Institute of Process Engineering, Chinese Academy of Sciences School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology
  • Received:2015-03-30 Revised:2015-04-21 Online:2015-06-20 Published:2015-06-20
  • Contact: DU Bing

PDF

被引次数

2

摘要： 在1550℃下将CaO-SiO2-Al2O3三元渣与Sn-Si合金混合精炼，降温熔析去除工业硅中的杂质B，考察了渣系光学碱度及合金组成对B去除的影响及作用机理. 结果表明，渣系光学碱度增大，BO1.5的活度系数降低明显，增加了B的分配系数，即增强了精炼效果. Sn-Si合金中Sn比例从0增至70%时，B在渣相与合金相间的分配系数从3.16提高至13.8，硅中B含量最低为0.89′10-6，最高除硼率为93.3%；当Sn比例大于30%时，合金粘度大幅降低，B的分配系数提高；当Sn比例为70%、合金粘度为0.61 mPa×s时，渣系CaO-SiO2-20%Al2O3与CaO-SiO2-40%Al2O3精炼工业硅所得最大B分配系数分别为10.1和12.3.

关键词: 复合熔析精炼, 硅, 硼, 合金化, 分配系数, 粘度

Abstract: Sn-Si alloy was refined for removal of boron by composite solvent refining with CaO-SiO2-Al2O3 slag at 1550℃, and the effects of optical basicity of slag and alloy composition on the removal of B and refining mechanism were examined. The results showed that with increasing of the optical basicity, the activity coefficient of BO1.5 decreased obviously, the partition ratio of B increased, leading to the enhancement of refining. When the content of Sn in the alloy increased from 0 to 70%, the partition ratio of B increased from 3.16 to 13.8, the lowest content of B was 0.89′10-6, and the highest removal rate of 93.3% achieved. When the content of Sn was over 30%, the viscosity of Sn-Si alloy substantially decreased, resulting in rising of the partition ratio of B. When the content of Sn was 70% and the viscosity of alloy 0.61 mPa×s, the highest values of partition ratio of B in both CaO-SiO2-20% Al2O3 and CaO-SiO2-40% Al2O3 slag systems were 10.1 and 12.3, respectively.

Key words: composite solvent refining, silicon, boron, alloying, partition ratio, viscosity

中图分类号: