w(MgO)/w(Al2O3)对复合炉料熔滴性能的影响  

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

作　　者：李神子 龙跃 潘向阳 杜培培 邢磊 LI Shen-zi;LONG Yue;PAN Xiang-yang;DU Pei-pei;XING Lei(School of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Modern Metallurgical Technique Key Laboratory of Ministry of Education,North China University of Science and Technology,Tangshan 063210,Hebei,China;School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]华北理工大学现代冶金技术教育部重点实验室,河北唐山063210 [3]东北大学冶金学院,辽宁沈阳110819

出　　处：《钢铁》2020年第9期16-22,110,共8页Iron and Steel

基　　金：河北省科技计划资助项目(17217691D)。

摘　　要：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95.55kPa·℃,复合炉料熔滴性能最佳,有利于高炉顺行。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 to1.2 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.

关 键 词：MGO AL2O3 复合炉料 软熔滴落性能 高炉 

分 类 号：TF53[冶金工程—钢铁冶金]