论文部分内容阅读
运用循环伏安法对固态原位电还原TiO2制取Ti的阴极还原过程进行了研究,探讨了固态原位电还原TiO2制取Ti的电解机理.研究发现,固态TiO2原位直接电还原为Ti是分步进行的:第一步为可逆、产物不溶的二电子反应,即Ti(Ⅳ)+2e=Ti(Ⅱ);第二步同样为可逆、产物不溶的二电子反应,Ti(Ⅱ)+2e=Ti.同时,在电解温度下,CaCl2熔体中存在着少量CaO.Ca2+在阴极放电析出金属Ca,即Ca2++2e=Ca,生成的金属Ca热还原TiO2生成金属Ti.固态原位电还原TiO2制取Ti是TiO2的直接电还原与Ca热还原TiO2共同作用的结果.
Cyclic voltammetry was used to study the cathodic reduction process of Ti in solid-state in-situ reduction of TiO2, and the mechanism of Ti in the solid-state in-situ reduction of TiO2 was discussed. The results showed that the solid state TiO2 was directly reduced to Ti The second step is also a reversible, product-insoluble two-electron reaction, namely Ti (II) + 2e = Ti (II) + 2e = Ti.At the same time, there is a small amount of CaO in the CaCl2 melt at the electrolysis temperature.Ca2 + precipitates metal Ca in the cathode, ie Ca2 ++ 2e = Ca, and the resulting metal Ca thermally reduces the TiO2 to form the metal Ti. Potential reduction of TiO2 to Ti is the result of direct electro-reduction of TiO2 and Ca-thermal reduction of TiO2.