关键词: 天然金红石, 石油焦, 流态化, 氯化, 热力学, 动力学

Abstract: Taking natural rutile as the research object, its mineral composition and microstructure are analyzed by chemical analysis, SEM, XRD, etc., and the influences of process parameters on boiling chlorination reaction activity of natural rutile is studied by single-factor experiments. The results show that the surface structure of natural rutile is dense; appropriate process parameters of boiling chlorination process are: temperature 950℃, particle size of natural rutile -96 mm, particle size of calcined petroleum coke -150 mm, petroleum coke 30%, chlorine flow rate 0.036 m3/h, reaction time 30 min, gas pressure 0.14 MPa, concentration of chlorine 100%. In such conditions, the chlorination rate of natural rutile can reach over 95%. Contrast experiments of natural rutile and high-titanium slag shows that calcium and magnesium are the key elements of chlorination reaction and final chlorination rate. The research on boiling chlorination kinetics of natural rutile indicates that the process meets the contracting unreduced nucleus model without solid products. When the temperature range is from 900℃ to 1000℃, the activation energy is 9.17 kJ/mol. The reaction is controlled by diffusion. So the effective way to improve the reaction efficiency is intensifying the mass transfer and enlarging the effective reaction surface.

Key words: natural rutile, petroleum coke, fluidization, chlorination, thermodynamics, kinetics