高チタン滓の流動塩素化について

Abstract

One of the applications of the fluidized bed chlorination process is described. Using high titanium slag, the preferential chlorination of impurities (especially FeO) and the chlorination of major constituent-TiO2 were studied.In the preferential chlorination, to prevent the bed from sintering, the addition of charcoal powder was effective. As reducing agent, charcoal producer gas was recommended, and optimum conditions were as follows; temperature 750-850°C, particle size 65-200mesh, Cl2 concentration 10%, u=, 0.2, mean residence time 30miuntes, and under these conditions, the Fe removal was over 90% and that of the other impurities. was about 70%.After this treatment, the slag could be chlorinated in fluidized bed with CO-Cl2 gas mixture at 1, 000°C or hlgher. But in these conditions, the construction materials were damaged quickly, so we studied the lower temperature chlorination using solid C as reductant. In this method, samples were prepared from slag. and pretreated slag, finely ground, mixed with charcoal powder, agglomerated with syrup binder and sized 35-150mesh.These two samples were chlorinated easily in fluidized bed. The optimum conditions were temperature-650-750°C Cl2 concentration 50%, (diluted with CO2 or N2), and u=0.1, and under these conditions, the reactions was concluded in 15 minutes with 80% or better chlorination ratios.