利用固体电解质在CaCl2熔盐中电解固态SiO2制备Si  

Preparation of Si by electrolysis of solid SiO2 with solid electrolyte in CaCl2 molten salt

作　　者：黄振彪 高运明[1,2] 秦庆伟[1] 李光强[1,2] Huang Zhenbiao;Gao Yunming;Qin Qingwei;Li Guangqiang(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Provincial Key Laboratory for New Processes of Iron-making and Steel-making,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉科技大学钢铁冶金新工艺湖北省重点实验室,湖北武汉430081

出　　处：《武汉科技大学学报》2019年第6期425-430,共6页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51174148)

摘　　要：通过对固态SiO2的理论分解电压进行计算,比较分析了惰性阳极和炭阳极条件下SiO2电解还原的特点。利用ZrO2(Y2O3)固体电解质管集成构建以Pt,O2(Ar)|ZrO2(Y2O3)为参比电极的三电极电解池,研究了惰性阳极条件下在CaCl2熔盐中电解固态SiO2阴极绿色制备Si的可行性。理论计算结果表明,SiO2在惰性阳极条件下进行电解还原相比使用炭阳极时难度较大,降低气相中的氧分压有利于SiO2的电解还原。实验结果表明,在惰性阳极条件下借助三电极电解池电解SiO2可以成功制备Si,相应电解过程可用三相界线反应机制进行解释。Based on the theoretical calculation of decomposition voltage of solid SiO2,the electrolytic reduction characteristics of SiO2 under conditions of inert anode and carbon anode were comparatively analyzed.A three-electrode electrolytic cell with Pt,O2(Ar)|ZrO2(Y2O3)as reference electrode was constructed integrally by using a ZrO2(Y2O3)solid electrolyte tube,and the feasibility of green electrolytic preparation of Si from solid SiO2 cathode in the CaCl2 molten salt under inert anode condition was studied.The results of theoretical calculation show that the electrolytic reduction of SiO2 under inert anode condition is much more difficult than that under carbon anode condition,and lower partial pressure of oxygen in gas phase is beneficial to the electrolytic reduction of SiO2.The experimental results show that it is feasible to produce Si by SiO2 electrolysis via the three-electrode electrolytic cell under inert anode condition,and the electrolysis process can be explained by the three-phase interlines reaction mechanism.

关 键 词：固体电解质 SIO2 SI 电解 ZrO2(Y2O3) CaCl2熔盐 惰性阳极 

分 类 号：TQ151[化学工程—电化学工业]