Fluidized-bed chlorination thermodynamics and kinetics of Kenya natural rutile ore
(1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2. Key Laboratory for Ecological Utilization of Multimetallic Mineral (Ministry of Education),
Northeastern University, Shenyang 110819, China
3. Hunan Research Institute for Nonferrous Metals, Changsha 410100, China)
2. Key Laboratory for Ecological Utilization of Multimetallic Mineral (Ministry of Education),
Northeastern University, Shenyang 110819, China
3. Hunan Research Institute for Nonferrous Metals, Changsha 410100, China)
Abstract: Natural rutile and gaseous chlorine with carbon as reductant were used to prepare titanium tetrachloride. 1173Kesing C uctant, Thermodynamics and kinetics of chlorination of Kenya natural rutile particles in a batch-type fluidized bed were studied at 1173-1273 K. Thermodynamic analysis of this system revealed that the equation of producing CO was dominant at high temperatures. Based on the gas-solid multi-phase reaction theory and a two-phase model for the fluidized bed, the mathematical description for the chlorination reaction of rutile was proposed. The reaction parameters and the average concentration of gaseous chlorine in the emulsion phase were estimated. The average concentration of emulsion phase in the range of fluidized bed was calculated as 0.3 mol/m3. The results showed that the chlorination of natural rutile proceeded principally in the emulsion phase, and the reaction rate was mainly controlled by the surface reaction.
Key words: natural rutile; thermodynamics; kinetics; gas-solid reaction; fluidized bed; two-phase model