摘要
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.
The cathodic processes of electrochemical reduction of solid titanium dioxide to Ti in situ were studied by cyclic vohammetry, and the reduction mechanism was derived. The results show that the reduction proceeds through two of the individual stages. The both stages are a reversible process with two - charge transfer, which can be expressed as Ti（Ⅳ）＋2e=Ti（Ⅱ） and Ti（Ⅱ）＋2e=Ti, respectively, and the each of their products is undissolved. The reduction of TiO2 to Ti was attributed to the calciothermic and electrochemical reduction when there is a few amount of CaO in the CaCl2 melt.
出处
《材料与冶金学报》
CAS
2008年第4期267-272,287,共7页
Journal of Materials and Metallurgy
基金
国家重点基础研究发展规划项目(2006AA068128)
关键词
钛
二氧化钛
固态原位电还原
循环伏安
钙热还原
Titanium
Titanium dioxide
electrochemical reduction
cyclic vohammetry
calciothermic reduction
