摘要
A new method for production of solar grade silicon(SoG-Si) at low cost from metallurgical grade silicon(MG-Si) via vacuum metallurgical technique was proposed,which is a promising process to feedstock solar energy silicon material independence of traditional Siemens method. In this procedure,pre-treatment of MG-Si using hydrometallurgical routes to remove the metallic impurities such as iron and aluminum to reduce the production cost is an important process. The influences of acid agents,acid concentration,reaction time and temperature and particle size of raw material ground on the removal efficiency of iron and aluminum impurities were investigated,respectively. The results show that the optimum operation conditions for leaching in acid C are:acid concentration 6 mol/L,temperature 60 ℃,time 4 d,diameter for raw material 50 μm. The removal efficiencies of impurities iron and aluminum are up to 85% and 75%,respectively.
A new method for production of solar grade silicon（SoG-Si） at low cost from metallurgical grade silicon （MG-Si） via vacuum metallurgical technique was proposed, which is a promising process to feedstock solar energy silicon material independence of traditional Siemens method. In this procedure, pre-treatment of MG-Si using hydrometallurgical routes to remove the metallic impurities such as iron and aluminum to reduce the production cost is an important process. The influences of acid agents, acid concentration, reaction time and temperature and particle size of raw material ground on the removal efficiency of iron and aluminum impurities were investigated, respectively. The results show that the optimum operation conditions for leaching in acid C are： acid concentration 6 mol/L, temperature 60 ℃, time 4 d, diameter for raw material 50 μm. The removal efficiencies of impurities iron and aluminum are up to 85% and 75%, respectively.
出处
《中国有色金属学会会刊：英文版》
CSCD
2007年第A02期1030-1033,共4页
Transactions of Nonferrous Metals Society of China
基金
Project (50674050) supported by the National Natural Science Foundation of China
Project (2006BAE01B08) supported by the Sustentation Project of Science and Technology of China
Project (20060674004) supported by PhD Programs Foundation of Ministry of Education of China
关键词
湿法冶金学
硅
除杂质
铁
铝
solar grade silicon
metallurgical grade silicon
hydrometallurgy
purification
