碱度对熔剂性球团生球性能的影响

Effect of basicity on quality of green fluxed pellets

熔剂性铁矿球团具有优良的高温冶金性能,是高炉炼铁的优质炉料。为探明生产熔剂性铁矿球团时碱度对生球性能的影响规律,以某钢厂赤铁精矿为原料,通过添加石灰石粉调节碱度,进行了造球及生球干燥特性试验研究。结果发现,提高碱度,生球落下强度呈提高趋势,抗压强度变化不明显,适宜膨润土配比略有下降,生球爆裂温度明显提高,生球干燥速率则没有明显变化。与基准自然碱度(R=0.14)相比,当碱度提高到0.6以上时,适宜膨润土配比由1.2%下降到1.1%,生球爆裂温度提高近50℃以上。

Fluxed iron ore pellets, which have a fine metallurgical performance, are the high quality burden for blast furnace ironmaking. In order to investigate the effect of basicity on the properties of green pellets, the hematite concentrated combined limestone powder to adjust the basicity of pellets, then the pelletizing and the drying characteristics of green pellets were carried out. The results show that the drop strength of green pellets is increasing with the increase of basicity, and the crushing strength and drying rate of green pellets have no obvious changes. Meanwhile, the optimum proportioning of bentonite decreased slightly and the decrepitation temperature increased obviously with increasing the basicity of pellets. Compared with the basic experiment, when the basicity was more than 0.6, the optimum proportioning of bentonite decreased to 1.1% from 1.2% and the decrepitation temperature increased by over 50 ℃.