FeSi<sub>2</sub>Ti相重构对工业硅中杂质酸洗行为的影响

doi:10.11896/cldb.18020087

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Abstract To strengthen acid leaching in purifying metallurgical grade silicon for solar cell applications, a novel phase reconstruction technology was proposed by Si-Fe-Ti solvent refining with forming FeSi₂Ti phase. It was found that the main precipitated phases were transferred from Si-Fe-Al, Si-Al-Fe and Si-Ti-Fe in metallurgical grade silicon to FeSi₂Ti, Si-Ti-Fe(τ₅) and Si-Fe-Al in Si-Fe-Ti alloy after Si-Fe-Ti solvent refining. By appl-ying acid etching technology, HCl+HF mixture was found as an effective lixiviant for dissolving the precipitated phases in both metallurgical grade silicon and its Si-Fe-Ti alloy. And the leaching behavior of the precipitated phases strongly depended on the composition of the major impurity elements. The impurity removal efficiency of acid leaching of metallurgical grade silicon was efficiently improved after Si-Fe-Ti solvent refining, especially for Mn, Ni, V and Cu. The purity of metallurgical grade silicon could be improved from 99.74% to 99.97% after once leaching Si-Fe-Ti alloy.

Key words： metallurgical grade silicon acid leaching hydrometallurgy impurity

Published: 16 May 2019

CLC number:

TB321

Fund:This work was financially supported by Shaanxi Province “Inorganic High Purity Silicon Material Industry Innovation Chain” Science and Technology Project (2017TSCXL-GY-06-02).

About author:: Huixian Lai, received his doctorate degree in College of Materials from Xiamen University in Sept. 2012—Jul. 2018. During this period, he has published more than 20 papers, including seven as the first author, owned one authorized national patent. Meanwhile, He has participated in three national natural funds and provincial key fund projects.
Xuetao Luo, born in February 1964, professor, doctoral supervisor, associate dean of materials college. In March 1996, he graduated from the Northwestern Polytechnical University with a doctorate in engineering. In July 1999, he was promoted to a professorship in a special way, and was awarded the state council government subsidy. In 2005, he was appointed as a doctoral supervisor. Currently, he is the director of the national metallurgical law solar polysilicon industrial technology innovation alliance and the AD hoc committee of several international metallurgical journals. He researches on slag refining, vacuum dephosphorization, plasma deboron removal, and directional solidification dehybridization has been carried out, which has accumulated abundant experimental experience and theoretical basis for the preparation of solar polysilicon by metallurgy.

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	LAI Huixian
	CAI Huaxian
	MENG Jinshui
	SHENG Zhilin
	ZHANG Yaohao
	LUO Xuetao

Cite this article:

LAI Huixian,CAI Huaxian,MENG Jinshui, et al. Effect of FeSi₂Ti Phase Reconstruction on Acid Leaching Behavior of Impurity Elements in Metallurgical Grade Silicon[J]. Materials Reports, 2019, 33(10): 1609-1614.

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http://www.mater-rep.com/EN/10.11896/cldb.18020087 OR http://www.mater-rep.com/EN/Y2019/V33/I10/1609

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