FeSi_2Ti相重构对工业硅中杂质酸洗行为的影响  

Effect of FeSi_2Ti Phase Reconstruction on Acid Leaching Behavior of Impurity Elements in Metallurgical Grade Silicon

作　　者：赖惠先[1] 蔡华宪 孟金水 盛之林 张尧昊 罗学涛[1] LAI Huixian;CAI Huaxian;MENG Jinshui;SHENG Zhilin;ZHANG Yaohao;LUO Xuetao(Fujian Key Laboratory of Advanced Materials,College of Materials,Xiamen University,Xiamen 361005;Shangnan Zhongjian Industrial Co. Ltd.,Shangnan 726300;School of Material Science and Engineering,Beifang University of Nationalities,Yinchuan 750021)

机构地区：[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

出　　处：《材料导报》2019年第10期1609-1614,共6页Materials Reports

基　　金：陕西省"无机高纯硅材料产业创新链"科技项目(2017TSCXL-GY-06-02)~~

摘　　要：为了强化酸洗提纯多晶硅技术,本工作通过FeSi_2Ti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FeSi_2Ti、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%。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 FeSi 2Ti 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 FeSi 2Ti,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.

关 键 词：工业硅 酸洗 湿法冶金 杂质 

分 类 号：TB321[一般工业技术—材料科学与工程]