FeSi2Ti相重构对工业硅中杂质酸洗行为的影响

doi:10.11896/cldb.18020087

材料导报

2019, Vol. 33

Issue (10): 1609-1614 https://doi.org/10.11896/cldb.18020087

无机金属及其复合材料

FeSi₂Ti相重构对工业硅中杂质酸洗行为的影响

赖惠先¹, 蔡华宪², 孟金水², 盛之林³, 张尧昊¹, 罗学涛¹

1 厦门大学材料学院,福建特种先进材料重点实验室,厦门361005
2 商南中剑实业有限公司,商南 726300
3 北方民族大学材料科学与工程学院,银川750021

Effect of FeSi₂Ti Phase Reconstruction on Acid Leaching Behavior of Impurity Elements in Metallurgical Grade Silicon

LAI Huixian¹, CAI Huaxian², MENG Jinshui², SHENG Zhilin³, ZHANG Yaohao¹, LUO Xuetao¹

1 Fujian Key Laboratory of Advanced Materials, College of Materials, Xiamen University, Xiamen 361005
2 Shangnan Zhongjian Industrial Co. Ltd., Shangnan 726300
3 School of Material Science and Engineering, Beifang University of Nationalities,Yinchuan 750021

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摘要为了强化酸洗提纯多晶硅技术,本工作通过FeSi₂Ti相重构来提高酸洗的除杂能力。研究结果发现,经Si-Fe-Ti合金精炼之后,工业硅中的主要杂质相由原来的Si-Fe-Al、Si-Al-Fe 和Si-Ti-Fe相转变成FeSi₂Ti、Si-Ti-Fe(τ5)和Si-Fe-Al相。采用原位刻蚀技术可以发现,去除工业硅和Si-Fe-Ti合金中的杂质相的最佳溶剂皆为HCl+HF混合酸,其中杂质相的酸洗行为和主要杂质的组成紧密相关。工业硅经Si-Fe-Ti合金化后能够提高HCl+HF混合酸的酸洗效果,特别是能够大幅降低Mn、Ni、V和Cu等难溶元素的含量,使得工业硅的纯度从99.74%提高到99.97%。

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关键词: 工业硅酸洗湿法冶金杂质

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

发布日期: 2019-05-16

ZTFLH:

TB321

基金资助: 陕西省“无机高纯硅材料产业创新链”科技项目(2017TSCXL-GY-06-02)

通讯作者: xuetao@xmu.edu.cn

作者简介: 赖惠先,2012年9月至2018年7月,以硕博连读的方式获得厦门大学工学博士学位;在此期间,发表外文论文二十余篇,其中第一作者七篇,授权国家专利1篇;先后参研三项国家自然基金和省重点基金项目。罗学涛,1964年2月出生,教授,博士生导师,材料学院副院长。1996年3月于西北工业大学博士研究生毕业,获得工学博士学位。1999年7月破格晋升教授,享受国务院政府津贴荣誉,2005年任博士生导师。现任全国冶金法太阳能多晶硅产业技术创新联盟理事和多个国际冶金期刊的特约审稿委员。近几年,罗教授开展了造渣精炼、真空除磷、等离子除硼、定向凝固除杂的研究,他的研究成果为冶金法制备太阳能多晶硅积累了丰富的实验经验和理论依据。

引用本文:

赖惠先, 蔡华宪, 孟金水, 盛之林, 张尧昊, 罗学涛. FeSi₂Ti相重构对工业硅中杂质酸洗行为的影响[J]. 材料导报, 2019, 33(10): 1609-1614.
LAI Huixian, CAI Huaxian, MENG Jinshui, SHENG Zhilin, ZHANG Yaohao, LUO Xuetao. Effect of FeSi₂Ti Phase Reconstruction on Acid Leaching Behavior of Impurity Elements in Metallurgical Grade Silicon. Materials Reports, 2019, 33(10): 1609-1614.

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

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