钛磁铁矿球团预还原影响因素的实验研究

对钛磁铁矿球团预还原进行实验研究, 考察实验预还原温度、球团配碳量和球团配料碱度对金属化率的影响。研究结果表明: 钛磁铁矿含碳球团配碳量以C/O为1.2最佳, 不符合此配比均会导致达到最佳还原速率的时间增加; 在钛磁铁矿含碳球团中加入合适的CaO可有效促进其预还原, 在T=1 300 ℃、C/O=1.2、CaO/SiO2=1.3的实验条件下, 球团金属化率可在15 min内达到峰值, 但过量CaO会成为预还原阻力; 低于900 ℃预还原温度下, 钛磁铁矿的煤基直接还原则难以实现。

Experimental Research on Influencing Factors for Pre-reduction of Titanomagnetite Pellets

An experimental research was conducted on pre-reduction of titanomagnetite pellets for investigating the influence of pre-reduction temperature, C/O ratio and CaO/SiO₂ ratio on the metallization rate of pellets. It is found that the optimal C/O ratio is 1.2 for the carbon-containing titanomagnetite pellets, otherwise it would take longer time to reach the best reduction rate. Also an appropriate addition of CaO into the pellets can accelerate the pre-reduction of pellets. Under the following experimental condition: at a temperature of 1 300 ℃, with C/O ratio of 1.2, CaO/SiO₂ ratio of 1.3, the metallization rate of pellet can reach the maximum in 15 minutes. But an excessive addition of CaO will hinder its pre-reduction, and the coal-based direct reduction process is not workable for titanomagnetite at a temperature less than 900 ℃.