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	The Effect of Calcium Oxide Addition on the Removal of Metal Impurities from Metallurgical-Grade Silicon by Acid Leaching
	He, Falin ; Zheng, Songsheng ; Chen, Chao ; Chen C(陈朝)
	2012-10
关键词	FE-SI ALLOYS PURIFICATION PHOSPHORUS KINETICS
英文摘要	The removal of metal impurities from metallurgical grade silicon (MG-Si) by acid leaching has been investigated with the addition of CaO. Prior to adding CaO, Fe is the main impurity in the MG-Si sample, and the 2nd-phase precipitates in silicon are Si-Fe-based alloys, such as Si-Fe, Si-Fe-Ti, Si-Fe-Al, Si-Fe-Mn, and Si-Fe-Ni. The phases of Si-Fe and Si-Fe-Ti are not appreciably soluble in HCl. After the introduction of CaO, Ca becomes the dominant impurity, and the 2nd-phase precipitates become Si-Fe-based alloys, such as Si-Ca, Si-Ca-(Fe, Ti, Ni, Al), and Si-Ca-Fe-Al. These are effectively leached with HCl. Therefore, the HCl leaching effect on the removal of metal impurities has been improved. The optimum content of Ca in the MG-Si samples after adding CaO is in the range of 1 pct to 4 pct, the contents of Fe, Al, Ti, and Ni have been decreased to a minimum of less than 5 ppmw (ppm by weight) each, and the acid leaching results do not show a dependence on Ca content at this range.
语种	英语
出版者	SPRINGER
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1007/s11663-012-9681-z]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	He, Falin,Zheng, Songsheng,Chen, Chao,et al. The Effect of Calcium Oxide Addition on the Removal of Metal Impurities from Metallurgical-Grade Silicon by Acid Leaching[J],2012.
APA	He, Falin,Zheng, Songsheng,Chen, Chao,&陈朝.(2012).The Effect of Calcium Oxide Addition on the Removal of Metal Impurities from Metallurgical-Grade Silicon by Acid Leaching..
MLA	He, Falin,et al."The Effect of Calcium Oxide Addition on the Removal of Metal Impurities from Metallurgical-Grade Silicon by Acid Leaching".(2012).

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