工业硅中杂质相的微观结构及分布规律研究  

Study on the microstructures and distributions of impurity phases in metallurgical grade silicon

作　　者：李圣 陈龙庆[1] 邱文彬 LI Sheng;CHEN Long-Qing;QIU Wen-Bin(Key Laboratory of Radiation Physics and Technology of Ministry of Education,Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China)

机构地区：[1]四川大学原子核科学技术研究所教育部辐射物理与技术重点实验室,成都610064

出　　处：《四川大学学报（自然科学版）》2022年第6期129-133,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：四川大学-达州市人民政府战略合作专项资金(2020CDDZ-03)。

摘　　要：工业硅中杂质相成分及比例直接影响有机硅单体合成的活性与选择性.因此,研究杂质相与杂质含量的对应关系尤为重要.本文通过扫描电镜(SEM)和能量色散X射线光谱仪(EDX)对精炼前和精炼后工业硅中夹杂物微观结构及赋存状态进行了研究.由于精炼前工业硅的Ca和Al含量较高,其杂质相主要以Si_(2)Al_(2)Ca、Si-Al-Ca和Si_(8)Al_(6)Fe_(4)Ca等为主;而精炼后Fe为主要元素,故其析出相主要包括FeSi_(2)(Al)、FeSi_(2)Ti和Si_(8)Al_(6)Fe_(4)Ca等.此外,本文通过Image Pro Plus进行统计,得到精炼前硅中Si_(2)Al_(2)Ca和Si_(8)Al_(6)Fe_(4)Ca相分别占夹杂物成分的48%和30%,而精炼后硅中FeSi_(2)(Al)相占比68%,唯一含Ca相(Si_(8)Al_(6)Fe_(4)Ca)仅占夹杂物含量的7%.本文将精炼前和精炼后的工业硅中杂质相成分及比例进行比较,意为寻找硅中杂质含量对杂质相的影响规律,以制备最佳的下游有机硅用工业硅原料.The compositions and contents of precipitates in metallurgical grade silicon(MG-Si)directly affect the activity and selectivity of silicone monomer synthesis.Therefore,it is particularly significant to investigate the relationship between impurity content and precipitates correspondence in MG-Si.In this study,the microstructures and distributions of precipitates in MG-Si before and after refining are investigated by using scanning electron microscope(SEM)and energy dispersive X-Ray spectroscopy(EDX).It is found that due to the high content of Ca and Al contents in MG-Si before refining,its impurity phases are mainly Si_(2)Al_(2)Ca,Si-Al-Ca,Si_(8)Al_(6)Fe_(4)Ca etc.,but after refining,Fe is the main element in MG-Si,so its phases mainly include FeSi_(2)(Al),FeSi_(2) Ti,Si_(8)Al_(6)Fe_(4)Ca,etc.In addition,the statistics conducted by Image Pro Plus show that the Si_(2)Al_(2)Ca and Si_(8)Al_(6)Fe_(4)Ca phases account for respectively 48%and 30%of the precipitates composition before refining,while the FeSi_(2)(Al)phase accounts for 68%after refining,and the only Ca-containing phase(Si_(8)Al_(6)Fe_(4)Ca)accounts for 7%of the precipitates content.Here we compare the compositions and proportions of precipitates in MG-Si before and after refining,in order to explore the law of impurity content on precipitated phases,so as to prepare the best downstream MG-Si raw material for silicones.

关 键 词：工业硅 微观结构 夹杂物 二甲基二氯硅烷 

分 类 号：TF89[冶金工程—有色金属冶金]