Abstract:The process and dynamic condition of TiO2 carbothermic reduction were studied by non-isothermal solid model. The results show that carbothermic reduction process is divided into four stages. C and TinO2n-1（n≥5）are the main phases of the first stage (1 373~1 523 K), which gradually change into C, TiC0.5O0.5 and TinO2n-1（2≤n≤4）at the second stage (1 523~1 673 K). C, Ti2O3 and TiC0.5O0.5 are the main phases of the third stage（1 673~1 833 K）, which finally change into TiC0.5O0.5 at the fourth stage (1 833~1 973 K). The kinetic equation of the first stage presents as , which is controlled by one-dimension diffusion with apparent activation energies of 113.55 kJ/mol. The kinetic equation of the second stage presents as , which is controlled by the second-order reaction with apparent activation energies of 303.36 kJ/mol. Temperature exerts significant influence in this stage. The kinetic equation of the third stage presents as , which is controlled by 1.5-order reaction with apparent activation energies of 53.93 kJ/mol, and this stage is limited by inadequate reducing agent. The kinetic equation of the last presents as , which is controlled by three-dimension diffusion with apparent activation energies of 99.22 kJ/mol, and this stage is mainly restricted by the loosing structure of product.