Hydrometallurgical purification of metallurgy grade silicon by acid leaching
This paper studied the purification of metallurgy grade silicon by acid leaching with different type acid and concentration.Before experiment,silicon metal had already handled by slagging process,so most boron was removed.In this paper,we grinded materials into 80-400 mesh powder,and compared the purification effect of using aqua regia,hydrochloric acid and hydrofluoric acid,respectively.With regard to the silicon metal,single acid cannot remove the impurities perfectly,but the effect of using hydrochloric acid first and following with hydrofluoric acid can be better.The removal rates of Mg,Al,Ca,Fe,and Ti were 96.8%,96.8%,98.2%,99.7%,and 98.0%,respectively.Then adjust the concentration of both acid to be 14% and 7% by weight,it turned out that 14% was much better.The removal rates of Mg,Al,Ca,Fe,and Ti were 87.1%,97.4%,99.0%,99.7%,and 99.1%,respectively.The results indicate that purification by multiple acids and 14% concentration could be an effective condition to remove impurities in silicon for acid leaching.
Metallurgical method silicon metal purification acid leaching
Rui Zeng Yunhua Wang Jixiang Zhang Jinquan Xu Haiyan Li Xiaofan Chen Weidong Xing
Kunming Institute of Precious Metals, Kunming 650106, China Kunming Institute of Precious Metals, Kunming 650106, China;Yunnan Qianyuan Solar Industry Co., Ltd, Yunnan Qianyuan Solar Industry Co., Ltd, Kunming 650106, China Kunming Institute of Precious Metals, Kunming 650106, China;State Key Laboratory of Comprehensive Ut
国际会议
太原
英文
428-431
2012-06-23（万方平台首次上网日期，不代表论文的发表时间）