Separation of Metal Impurities from Metallurgical Grade Silicon via CaO-SiO2-CaF2 Slag Treatment Followed by Leaching with Hydrochloric Acid

被引：18

作者：

Fang, M. ^{[1
]}

Lu, C. H. ^{[1
]}

Huang, L. Q. ^{[1
]}

Lai, H. X. ^{[1
]}

Chen, J. ^{[1
]}

Li, J. T. ^{[1
]}

Ma, W. H. ^{[2
]}

Xing, P. F. ^{[3
]}

Luo, X. T. ^{[1
]}

机构：

[1] Xiamen Univ, Coll Mat, Xiamen 361005, Peoples R China

[2] Kunming Univ Sci & Technol, Fac Mat & Met Engn, Kunming, Peoples R China

[3] Northeastern Univ, Sch Mat & Met, Shenyang, Peoples R China

来源：

SEPARATION SCIENCE AND TECHNOLOGY | 2014年 / 49卷 / 14期

基金：

美国国家科学基金会;

关键词：

cracking shrinking model; leaching; metallurgical grade silicon; purification; slag; KINETICS; REMOVAL; PURIFICATION; CALCIUM; PHOSPHORUS;

D O I：

10.1080/01496395.2014.919323

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The separation of metal impurities from metallurgical grade silicon by a combination of slag treatment and acid leaching was investigated. Based on a detailed analysis of microstructure evolution in metallurgical grade silicon, the primary precipitated phase in silicon was tended to form Si-Ca system intermetallics after CaO-SiO2-CaF2 slag treatment. Moreover, the extraction efficiency of metal impurities from silicon with slag treatment was higher than that without slag treatment in the leaching process. Some parameters such as acid concentration, temperature, particle size, stirring speed and leaching time were also discussed. The extraction of impurities Fe, Al and Ca increased with increasing acid concentration, leaching time and decreasing particle size. Besides, the leaching kinetics of these metal impurities was confirmed to be controlled by chemical reaction with the application of cracking shrinking model.

引用

页码：2261 / 2270

页数：10

共 27 条

[1] Kinetics of oxalic acid leaching of tincal [J].