w(MgO)/w(Al2O3)对复合炉料熔滴性能的影响

 高炉炉料中适宜的w(MgO)/w(Al₂O₃)可以提高炉渣的冶金性能,有利于高炉的冶炼,以达到增产、节能和降耗的目的。为探究MgO质量分数对复合炉料性能的影响,在试验过程中分别改变复合炉料内烧结矿、球团矿的w(MgO)/w(Al₂O₃),使用高温熔滴炉检测其熔滴性能,并对未滴落物进行XRD、SEM-EDS检测,探究渣中成分和分布规律,最终得到合理的MgO配分结构。试验结果表明,烧结矿中w(MgO)/w(Al₂O₃)由0.8增加至1.2的过程中,滴落温度先减小后增大,软熔带位置不断下移并呈现先变窄后变宽的趋势,镁硅钙石和镁黄长石的含量不断增大,而尖晶石和方镁石含量在w(MgO)/w(Al₂O₃)超过1.0后逐渐增大;球团矿中w(MgO)/w(Al₂O₃)由1.39增加至2.09的过程中,熔化区间先减小后增大,软熔带先上移后下降。烧结矿中w(MgO)/w(Al₂O₃)为1.0、球团矿中w(MgO)/w(Al₂O₃)为1.74时,熔滴特征值为95.55 kPa·℃,复合炉料熔滴性能最佳,有利于高炉顺行。

Effect of w(MgO)/w(Al2O3) on droplet performance of composite burden

The appropriate w(MgO)/w(Al₂O₃) in the blast furnace charge can improve the metallurgical properties of the slag, which is beneficial to the smelting of the blast furnace, so as to achieve the smelting purpose of increasing production, energy-saving and reducing consumption. In order to explore the influence of w(MgO) on the performance of composite charge, Change the w(MgO)/w(Al₂O₃)of the sintered ore and pellets in the composite charge, use a high-temperature melt drop furnace to test its droplet performance, and perform XRD and SEM-EDS detection on undripped droplet to explore the composition and distribution of slag. Finally, a reasonable w(MgO) partition structure was obtained. The test results show that during the increase of w(MgO)/w(Al₂O₃) from 0.8 to 1.2 in the sintered ore, the dropping temperature first decreases and then increases, the position of the reflow zone is continuously lowered and shows a trend of first narrowing and then widening. The content of feldspar and forsterite increased continuously, while the content of spinel and periclase gradually increased after w(MgO)/w(Al₂O₃) exceeded 1.0; during the increase of w(MgO)/w(Al₂O₃) in pellets from 1.39 to 2.09, the melting interval decreased first and then increase, the reflow zone first moves up and then decreases. When the w(MgO)/w(Al₂O₃) in the sintered ore is 1.0 and the w(MgO/w(Al₂O₃) in the pellets is 1.74, the characteristic value of the droplet is 95.55 kPa·℃, and the composite droplet has the best droplet performance, which is beneficial for the blast furnace to go forward.