Al<sub>2</sub>O<sub>3</sub>对高炉渣性能和结构的影响及其应用

doi:10.13228/j.boyuan.issn0449-749x.20220648

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Abstract To solve the main problems of poor slag fluidity, difficult separation of slag and iron, poor permeability of soft melting zone and the like in the smelting process of high-alumina blast furnace. The influence of Al₂O₃ content on the composition and properties of blast furnace slag in Handan Steel was studied according to the composition change range of blast furnace slag, combined with theoretical calculation and experiment, When the mass percent of Al₂O₃ in the slag was between 15% and 18%, the proper w(MgO)/w(Al₂O₃) and binary alkalinity control range were obtained. The research results were used to guide the smelting of high alumina ore in Han Steel. The results show that when the mass percent of Al₂O₃ increases from 15% to 16%, with the complexity of slag structure, the viscosity of slag increases. The viscosity of slag at 1 500 ℃ is generally lower than 0.4 Pa·s, which will not affect the normal smelting of blast furnace. When the mass percent of Al₂O₃ increases from 16% to 17%, the viscosity of the slag increased sharply due to the continuous complexity of the slag structure and the precipitation of the high melting point magnesium aluminate spinel phase. At this time, the basicity of the slag was controlled from 1.25 to 1.30, and w(MgO)/w(Al₂O₃) in the slag was controlled from 0.4 to 0.6, which can ensure the stability of No. 2 and No.8 blast furnaces of Han Steel and the smelting index. When the mass percent of Al₂O₃ changes from 17% to 18%, the precipitated phase in the slag does not change, but the degree of polymerization of the slag structure further increases, resulting continuous increase of the viscosity and melting temperature of the slag. At this time, the basicity of the slag is reduced to between 1.15 and 1.19, and w(MgO)/w(Al₂O₃) is 0.51-0.61, which can meet the needs of normal smelting and stable index of blast furnace in Handan Steel. Finally, the smelting indexes of the main 3 000 m³ blast furnaces in China in 2021 is compared. Handan Steel is one of the most stable enterprises in smelting high-alumina iron ore, and the proportion of large blast furnaces is high. It realizes the continuous and stable smelting of economic high-alumina raw materials, and has certain reference significance for the implementation of high-alumina ore smelting in large blast furnaces in the industry.

Key words： Al₂O₃ blast furnace slag w(MgO)/w(Al₂O₃) binary basicity viscosity

Received: 14 October 2022

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	HOU Jian
	CHEN Bu-xin
	BAI Chen-guang
	HAN Jian
	HUANG Xiao-bo
	HU Mei-long

Cite this article:

HOU Jian,CHEN Bu-xin,BAI Chen-guang等. Effect of Al₂O₃ content on property and structure of BF slag and its utilization in iron making[J]. Iron and Steel, 2023, 58(5): 39-50.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220648 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I5/39

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