Application of KCl-NaCl-CaCl2 ternary molten salts in FFC Cambridge process
The KCl-NaCl-CaCl2 ternary molten salts, with lower melting temperatures and higher electric conductivities than single CaCl2, were introduced into the direct electrolyzing solid TiO2 to the solid metal (FFC process). Electrolysis temperatures below 1073 K were realized. Higher electric conductivity could decrease the resistance of oxygen ions migration and reduce the specific energy consumption of background current. The content of Ca2+ in the molten salts could control the Ca-thermo reduction, which provided a strong reducing power but introduced the secondary reactions. The results showed that there was an optimum concentration range of CaCl2 in the tri-mixed molten salt system, 10％—15％ at 1023 K. Both current efficiency above 50％ and oxygen content less than 0.5％ in the product were obtained after 8 h electrolysis.
FFC method secondary reactions current efficiency background current density oxygen content
CAI Zhuofei GUO Zhancheng TANG Huiqing ZHANG Zhimei
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
国际会议
The 3rd Asian Conference on Molten Salts and Ions Liquids 2011(第三届亚洲熔盐与离子液体会议)
哈尔滨
英文
8-13
2011-01-06（万方平台首次上网日期，不代表论文的发表时间）