Composition of off-gas produced by combined fluidized bed
chlorination for preparation of TiCl4
chlorination for preparation of TiCl4
(1. State Key Laboratory of Multiphase and Complex Systems, Institute of Process Engineering,
Chinese Academy of Sciences, Beijing 100190, China;
2. Department of Energy and Resources Engineering, College of Engineering,
Peking University, Beijing 100871, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
4. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;)
Chinese Academy of Sciences, Beijing 100190, China;
2. Department of Energy and Resources Engineering, College of Engineering,
Peking University, Beijing 100871, China;
3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
4. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;)
Abstract: The effects of carbon/slag molar ratio, chloride amount and temperature on equilibrium molar ratio (REq) 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 (REx) 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, REx, REq and corresponding reference data (RRe) were compared. The results indicate that REx is similar to RRe (0.5−1.2) but different from REq (≥4.3), which is consistent with anticipation of REx for the novel combined fluidized bed. The difference between REx and corresponding REq is mainly attributed to short retention time (about 1 s) of materials in combined fluidized bed and carbochlorination of oxide impurities contained in titanium slag, such as CaO, MgO and SiO2.
Key words: titanium slag; equilibrium component; combined fluidized bed; carbochlorination