Composition of off-gas produced by combined fluidized bed chlorination for preparation of TiCl4

The effects of carbon/slag molar ratio, chloride amount and temperature on equilibrium molar ratio (R-Eq) Of CO to CO2 for off-gas produced by carbochlorination of titanium slag were firstly investigated by thermodynamic calculation of equilibrium components of off-gas. The experimental CO/CO2 molar ratio (R-Ex) was then obtained to be 0.2-0.3 by the carbochlorination experiment using a novel combined fluidized bed as chlorination reactor. To further investigate the reaction effect of the novel process mentioned above, R-Ex, R-Eq and corresponding reference data (R-Rc) were compared. The results indicate that R-Ex is similar to R-Rc (0.5-1.2) but different from R-Eq (>= 4.3), which is consistent with anticipation of R-Ex for the novel combined fluidized bed. The difference between R-Ex and corresponding R-Eq is mainly attributed to short retention time (about I s) of materials in combined fluidized bed and carbochlorination of oxide impurities contained in titanium slag, such as CaO, MgO and SiO2.Metallurgy & Metallurgical EngineeringSCI(E)EI中国科技核心期刊(ISTIC)2ARTICLE1128-1342