Metal impurities removal from metallurgical grade silicon by hydrochloric acid leaching
As a pre-treatment process for producing solar-grade silicon, hydrometallurgical method could remove the most of metallic impurities of metallurgical-grade silicon, which is a hopeful technology to provide solar energy material independence of the Siemens skill.Factors such as the hydrochloric mass fraction, temperature, reaction time, and particle size of silicon powders were investigated in the impurities removal experiments under the condition of mechanical stirring.The leached samples were analyzed by ICP and SEM.The optimum parameters, hydrochloric mass fraction 5%, temperature 80℃, reaction time 9h, particle size 75μm, were determined by single factor experiments and orthogonal experiments.The 86.1% of Fe, 68.1% of Al, 85.9% of Ca and 25.9% of B impurity was removed from metallurgical-grade silicon powder.
solar-grade silicon metallurgical-grade silicon hydrometallurgy leaching
Xiaoming Lia Yanmei Dang Wenfeng Li Junxue Zhao Yaru Cui
School of Metallurgical Engineering,Xian University of Architecture and Technology,Xian 710055,China
国际会议
香港
英文
7-10
2013-06-25（万方平台首次上网日期，不代表论文的发表时间）