文献类型：期刊文献

英文题名：Iron Removal from Metallurgical Grade Silicon Melts Using Synthetic Slags and Oxygen Injection

作者：Long, Xiao Luo, Wenbo Lu, Guohong Chen, Falou Zheng, Xiaoning Zhao, Xingfan Long, Shaolei

第一作者：龙行

通信作者：Long, X[1];Luo, WB[1]

机构：[1]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[2]Yunnan Yongchang Silicon Ind Co Ltd, Baoshan 678300, Peoples R China;[3]Yunnan Longling Cty Longshan Silicon Co Ltd, Baoshan 678300, Peoples R China;[4]Zhejiang Xinan Chem Grp Co Ltd, Jiande 311600, Peoples R China;[5]Longling Pengyue Sci & Technol Consulting Serv Co, Baoshan 678300, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2022

卷号：15

期号：17

外文期刊名：MATERIALS

收录：;EI(收录号：20223812757357);Scopus(收录号：2-s2.0-85137982140);WOS:【SCI-EXPANDED(收录号:WOS:000851664000001)】；

基金：This research was funded by the National Natural Science Foundation of China (51904083), the Growth Project of Young Scientific and Technological Talents in Universities of Guizhou Province [Qian Jiao He KY Zi (2021)262], and the Guizhou Institute of Technology high-level talents research launch project [XJGC20190963].

语种：英文

外文关键词：synthetic slag; metallurgical-grade silicon; refining; Fe removal; oxygen injection

摘要：Novel SiO2-CaO-CaF2-R2O-MgO based synthetic slags (R2O represents alkali metal oxides) with varied binary basicity values were used with oxygen injection to refine silicon melts and remove Fe from metallurgical-grade silicon. Silicon samples and slags at the silicon-slag interfaces were obtained during refinement. The compositions of the silicon samples were analyzed, and the quenched slag samples and mild cooling slags from the final crucible were inspected using scanning electron microscopy and energy dispersive X-ray spectroscopy. After 15 min of refinement, the Fe removal rate ranged from 52.3 to 60.1 wt%. During the refining process, the Fe-concentrated phase formed within the silicon droplets and was then transferred to the silicon-slag interfaces and wetted with slags. The Fe-concentrated phase at the silicon-slag interface can dissolve directly in the slags. It can also be transferred into the slag phase in the form of droplets, which can be affected by the binary basicity of the slags. Ti removal demonstrated a similar mechanism. Fe-bearing crystals were not detected in the quenched slag samples obtained during refinement, while complex Fe-bearing phases were detected in the final slag. This study demonstrates Fe removal from metallurgical-grade Si using slag refining methods and reveals the removal mechanism during the refinement.