CaCl_2熔盐中电解高钛渣/SiO_2复合阴极制备Ti_5Si_3的研究  

Preparation of Ti_5Si_3 Alloy by Electrolysis Ti-enriched Slag/SiO_2 Composite Cathode in CaCl_2 Molten Salt

作　　者：况文浩 华一新[1,2] 徐存英[1,2] 李坚[1,2] 李艳[1,2] 张臻[1,2] 高小兵[1,2] KUANG Wen-hao HUA Yi-xin XU Cun-ying LI Jian LI Yan ZHANG Zhen GAO Xiao-bing(Faculty of Metallurgical and Energy Engineering State Key Lab of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]昆明理工大学复杂有色金属资源清洁利用国家重点实验室,昆明650093

出　　处：《有色金属（冶炼部分）》2017年第7期52-57,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51274108)

摘　　要：采用FFC熔盐电解法,在900℃和2.6~3.2V槽电压的条件下,以CaCl2熔盐为电解质电解还原高钛渣/SiO_2复合阴极,成功制备出了Ti_5Si_3合金。通过热力学计算和单因素条件试验探讨了电解时间和槽电压对电解产物的影响。结果表明,在初始阶段反应速率很快,随着中间产物CaTiO_3和CaSiO_3的生成,反应速率逐渐减缓。当槽电压为2.6V时,反应速率缓慢;提高到2.8V后,反应速率有了明显的提升。在900℃、8h、3.2V的条件下制备出的Ti_5Si_3为疏松多孔、粒径为2~5μm的合金粉末。Porous Ti5Si3 alloy was prepared from Ti-enriched slag/SiO2 mixed pellet by FFC method in CaCl2 molten salt at 900 ℃ with cell voltage of 2.6-3.2 V. The effects of electrolysis time and cell voltage on electrolysis were investigated by thermodynamics analysis and single factor experiments. The results show that reaction rate is high in initial period, and slows down due to formation of intermediates of CaTiO3 and CaSiO3. The reaction rate is low at cell voltage of 2. 6 V, but grows high obviously at 2. 8 V. Porous TisSi alloy with particle size of 2-5μm is obtained under the condition of 900 ℃, 8 h, and 3. 2 V.

关 键 词：TI5SI3 高钛渣 SIO2 CaCl2熔盐电解 

分 类 号：TF823[冶金工程—有色金属冶金]