攀西钛矿球团焦炉煤气还原研究

Study on reduction of panxi titanium ore pellets by coke oven gas

针对攀西钛精矿粒度细、直接入炉冶炼钛渣难的问题,提出细粒级钛矿制备钛矿球团,钛矿球团焦炉煤气还原,并与细粒级钛精矿开展对比试验研究。结果表明:钛矿球团通过预焙烧后出现微裂纹和孔洞,有利于气相还原反应的进行,当还原温度在950℃时,钛矿球团焦炉煤气还原4 h后,金属化率可达85%以上,还原过程中钛矿球团物相结构发生较大变化,其主要物相由铁板钛矿相变成金属铁相、金红石相和少量钛铁矿相;随着反应进行钛矿球团中金属Fe逐渐显现、呈星点状分布、随之长大,最后连接成片。为攀西细粒级钛精矿冶炼钛渣提供了一定理论支撑。

Aiming at the problem that Panxi titanium concentrate is difficult to be directly added into furnace due to the fine particle size, the process of reducing the pellets prepared from the titanium ore by coke oven gas was proposed. And the comparative experiments between the pellets and titanium concentrate were also carried out. The results show that micro-cracks and holes appear in the titanium pellets after preroasting,which is favorable for the gas phase reduction reaction. At the reduction temperature of 950 ℃ for 4 h, the metallization rate of titanium ore pellets can reach more than 85%. During the reduction process, the phases of titanium ore pellets change greatly. The main phases change from pseudobrookite to metallic iron, rutile and a small amount of ilmenite. As the reaction progresses, the metallic Fe in the titanium ore pellets gradually appears with scattered distribution, and gradually grows into pieces. It provides theoretical support for smelting titanium slag from Panxi fine grade titanium concentrate.