w(MgO)/w(Al2O3)对复合炉料熔滴性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20200026

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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.

Key words： MgO Al₂O₃ composite burden drop property of soft melt blast furnace

Received: 15 January 2020

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	Articles by authors
	LI Shen-zi
	LONG Yue
	PAN Xiang-yang
	DU Pei-pei
	XING Lei

Cite this article:

LI Shen-zi,LONG Yue,PAN Xiang-yang等. 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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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200026 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I9/16

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