Effect of w(MgO)/w(Al2O3) on droplet performance of composite burden
LI Shen-zi1,2, LONG Yue1,2, PAN Xiang-yang3, DU Pei-pei1,3, XING Lei1,2
1. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Modern Metallurgical Technique Key Laboratory of Ministry of Education, North China University of Science and Technology, Tangshan 063210, Hebei, China; 3. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Abstract: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.
李神子, 龙跃, 潘向阳, 杜培培, 邢磊. w(MgO)/w(Al2O3)对复合炉料熔滴性能的影响[J]. 钢铁, 2020, 55(9): 16-22.
LI Shen-zi, LONG Yue, PAN Xiang-yang, DU Pei-pei, XING Lei. Effect of w(MgO)/w(Al2O3) on droplet performance of composite burden[J]. Iron and Steel, 2020, 55(9): 16-22.
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