Preparation of Low-Carbon Ti_2O_3 by Carbonthermal Reduction of the Mixture of Titanium Dioxide and Activated Carbon Under Vacuum Condition

摘要

Low-carbon Ti_2O_3 was prepared by carbonthermal reduction of the mixture of titanium dioxide and activated carbon at vacuum condition. The kinetics and phase evolution of Ti_2O_3 formation process were investigated through X-ray diffraction and gravimetric analysis. The only intermediate phase detected is Ti_3O_5. The reduction time was reduced sharply to 4 h when temperature was raised to 1300°C. The best molar ratio of activated carbon and TiO_2 is 0.6-1. At this condition, the content of Ti_2O_3 in slag is up to 95.63% and the content of the carbon element is below 0.004%, which meets the requirements for the further preparation of metal Ti by FFC Cambridge process. At the same time, the microstructure of Ti_2O_3 generated presented porosity, which would promote the electro-deoxidation process extremely.