The investigation of the formation of CaTiO3 during electrochemical reduction of TiO2 in molten calcium chloride

• 1、Chemistry and Chemical Engineering University,Chongqing 400044

Abstract：Titanium was fabricated by typical FCC method in which the TiO2 was electrolyzed under a certain condition by using an graphite carbon rod as anode, TiO2 as cathode and molten CaCl2 as electrolyte. The formation of CaTiO3 which a typical medium productions in FCC process was mainly studied by XRD, SEM, BET and gas detection at the anode using pH test paper under different electrolysis conditions. The result indicated that the CaTiO3 was formed from different ways under different stages.CaCl2 is hydrolyzed into a small amount of CaO under experimental conditions in heating process，and then CaO reacts with TiO2 to produce little CaTiO3 on the cathode surface. The electric double layer is formed between solid TiO2 and liquid CaCl2 because of applied voltage, which results in the formation of small amount of O2- owing to TiO2 ionization. TiO2 reacts with O2-,combined with Ca2+ in molten salt to generate little CaTiO3 on the cathode surface. A lot of CaTiO3 and titanium suboxides are formed in cathode during the reaction of TiO2 and CaCl2 at high temperature and electron supplied by external power.

Keywords： electro-deoxidation TiO2 CaTiO3 formation