富氢对块状带低钛球团矿还原的影响研究

Effect of Hydrogen-rich on Reduction of Low Titanium Pellets in the Lumpy Zone

在高炉喷吹煤造气冶炼条件下,研究在低温区块状带不同H2含量和不同温度对矿石还原情况的影响。试验结果表明:当还原温度为900℃时,还原速率随着H2含量的增加而逐渐变大,当还原气氛一定时,还原速率随着还原温度的增加而逐渐变大;还原后的球团主要物相是单质铁,并含有少量的镁钛铁矿(Mg,Fe)(Fe,Ti)O3、镁铝尖晶石(Mg Al2O4)和镁橄榄石(Mg2Si O4);随着还原温度的增加,镁钛铁矿(Mg,Fe)(Fe,Ti)O3首先开始消失,镁铝尖晶石(Mg Al2O4)和镁橄榄石(Mg2Si O4)逐渐减少,并且随着还原温度的增加,H2的还原能力显著加强,铁矿石失氧速率增加,生成的金属铁发生聚集,导致球团内部留下小细孔。

Based on the blast furnace gas-injection, the effects of different H2 contents and temperatures on the reduction of ore in the low temperature lumpy zone are studied. The result shows that, when the temperature of reduction is 900 ℃, the reduction rate increases with an increase in the H2 content. When H2 content is fixed,the reduction rate increases with temperature. The main phases are Fe and small a- mount of （ Mg, Fe） （ Fe, Ti） O3, （ MgAl2O4 ）, （ Mg2 SiO4 ） after reduction. With increasing temperature, the （Mg,Fe） （Fe,Ti） O3 disappears firstly,then the （MgAl2O4） and （Mg2SiO4） decreases,and reducing capacity of H2 significandy improves, the oxygen loss rate of iron ore increases, the resulted iron aggregates and some small pores would appear in the pellets.