采用循环伏安方法研究了1173 K时CaCl2-0.5%CaO (摩尔分数)和 等摩尔CaCl2-X-0.5%CaO(X=NaCl, BaCl2, LiCl) 熔盐中CaO在Mo电极上的阴极行为.研究结果表明,CaCl2与CaO电离的Ca2+具有不同的离子结构和还原电势, 在1173K时其还原峰电势分别为-2.15和-1.51 V.等摩尔混合熔盐CaCl2-x-0.5%CaO (x=NaCl, BaCl2)中,CaO诱发电解质产生低电位沉积, 降低了混合熔盐的电化学稳定性.通过阴极扫描电流峰密度与 扫描速率的关系, 计算出1173K时CaO电离的Ca2+在CaCl2-0.5%CaO,等摩尔的CaCl2-NaCl-0.5%CaO,CaCl2-BaCl2-0.5%CaO和CaCl2-LiCl--0.5%CaO熔盐中的扩散系数,分别为6.42×10-5, 1.56×10-5,1.20×10-5和 6.79×10-5cm2/s.
CaOˇs decomposition is an important reaction in the new titanium refining processes and is one of the key factors to affect the current efficiency and the energy consumption of the new titanium refining processes. In present work, the cathodic behaviors of CaO in CaCl2-0.5mol%CaO, equal molar CaCl2-NaCl-0.5mol%CaO, CaCl2-BaCl2-0.5mol%CaO and CaCl2-LiCl-0.5mol%CaOmelts were studied by cyclicvoltamme technique systematically. The reduced potentials of Ca2+ from CaCl2 and from CaO are different. NaCl doesnˇt affect the reduced potential of Ca2+ from CaO(hereafter named simply as φCa2+/Ca (⒐)), LiCl increases φCa2+/Ca (⒐) slightly, BaCl2 decreases φCa2+/Ca (⒐) evidently. The diffusion coefficients of Ca2+ from CaO in CaCl2-0.5mol%CaO, equal molar CaCl2-NaCl- 0.5mol%CaO, CaCl2-BaCl2-0.5mol%CaO and CaCl2-LiCl-0.5mol%CaO melts at 1173K were obtained.
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