固态原位电还原TiO_2制取Ti的阳极和电极过程

运用循环伏安法对固态原位电还原TiO2制取Ti的阳极过程进行了研究,并分析了整个电极反应过程.研究发现,固态原位电还原TiO2制取Ti的阳极过程是一步二电子氧化反应,并且可逆,产物不熔,在石墨阳极下生成CO2气体,阳极电极反应:C+2O2--4e=CO2.固态原位电还原TiO2制取Ti的总电极反应为:2TiO2+C=2TiO+CO2,2TiO+C=2Ti+CO2,2CaO+C=2Ca+CO2.阴极生成的Ca可以继续对TiO2进行热还原反应,固态原位电还原TiO2制取Ti是TiO2的直接二步电还原与Ca热还原TiO2共同作用的结果.

Investigation of Anode and Electrode Processes of Solid State in Situ Electrochemical Reduction from TiO2 to Ti

The anode process of solid state in situ electrochemical reduction from TiO2 to Ti was studied by cyclic voltammetry and the whole electrode process was analyzed.The results show that the anode process is a one-step reversible oxidizing reaction of two-charge with the products undissolved and CO2 is produced at carbon anode.The anode reactions can be expressed as C+2O2——4e=CO2.The general electrode reactions can be expressed as 2TiO2+C=2TiO+CO2,2TiO+C=2Ti+CO2,2CaO+C=2Ca+CO2.The Ca produced at cathode can also continue the thermo-reduction reactions.The reduction of TiO2 to Ti is attributed to the directly electrochemical reduction of TiO2 and calciothermic reaction when there is a few amount of Ca in the CaCl2 melt.