Removal of Fe from Ilmenite Ore Powders Through Selective Chlorination Using CO and Cl2 Gas Mixture at 1073-1173 K in a Static Bed

초록

To develop a selective chlorination process for ilmenite ores with the aim of attaining a high chlorination ratio of Fe and minimal Ti loss with low activation energy, the kinetics of the selective chlorination of Fe from ilmenite ore powders using a mixture of CO and Cl-2 gases in a static bed reactor was investigated. Experiments were conducted using ilmenite ore powders in the ranges of 45-75 mu m and 180-212 mu m at 1073-1173 K. When the chlorination reactions proceeded at 1173 K for 60 min, 94.12% of the Fe and 2.18% of the Ti were removed from the ore. After the selective chlorination reactions, TiO2 with a porous microstructure was generated owing to the selective removal of Fe from the ore. The generated pores allowed the CO-Cl-2 gas mixture to easily penetrate into the reaction interface. As a result, when the unreacted shrinking-core model was utilized, the rate-controlling step was chemical reaction at the interface. In addition, the activation energy was 49.879 kJ & BULL; mol(-1) for the selective chlorination of ilmenite ore powders using the CO-Cl-2 gas mixture at 1073-1173 K. The results demonstrate that minimal Ti loss and a high chlorination ratio of Fe are feasible when the selective chlorination of ilmenite ore powders is performed at 1173 K using a CO-Cl-2 gas mixture in a static bed reactor.

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