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.
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