CaO-SiO2-Al2O3-MgO-FeO渣对Al2O3的溶解

doi:10.13228/j.boyuan.issn0449-749x.20230339

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Abstract In order to control the Al₂O₃ inclusions in low-carbon Al-killed steel and improve the adsorption capacity of the slag system to Al₂O₃ inclusions, the isoviscosity diagram of CaO-SiO₂-Al₂O₃-5%MgO-5%FeO slag system and the contour map of ΔC/η (ΔC=C^s_Al₂O₃-C^b_Al₂O₃, η is the viscosity of slag) were simulated by FactSage 8.1. The dissolution rate of Al₂O₃ in CaO-SiO₂-Al₂O₃-5%MgO-5%FeO slag system was studied. The effects of Al₂O₃ rod immersion depth, diameter, rotation speed, slag composition and temperature on the dissolution rate of Al₂O₃ were discussed. The activation energy of Al₂O₃ in the dissolution process was solved. Finally, the qualitative analysis of the micro-line elements at the interface between the alumina rod and the slag was carried out by field emission scanning electron microscopy (Apreo S HiVac). The results show that the dissolution rate of Al₂O₃ in slag is affected by many factors. The dissolution rate increases with the increase of rotation speed, rod diameter, immersion depth and temperature of alumina rod. The dissolution rate also increases with the increase of CaO content, and decreases with the increase of Al₂O₃ and SiO₂ content. The dissolution rate is highly dependent on the viscosity of the slag. The viscosity of the slag is negatively correlated with the dissolution rate of Al₂O₃, and the dissolution rate of Al₂O₃ is positively correlated with the concentration driving force. Before the alumina rod is dissolved in the slag system, it will be transformed into intermediate phases CaO·2Al₂O₃ and CaO·6Al₂O₃, and the intermediate phase is dissolved in the slag. The apparent activation energy of dissolution in slag A is 410.9 kJ/mol. The dissolution rate of Al₂O₃ in slag was verified by comparing the dissolution rate diagram with the contour diagram of ΔC/η.

Key words： low carbon aluminium killed steel refining slag containing FeO Al₂O₃ inclusion iso-viscosity line dissolution rate

Received: 20 June 2023

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	QI Zhan
	CHENG Rijin
	WU Xianmin
	HUO Liqiao
	ZHU Juntao
	LIU Chengsong
	ZHANG Hua
	NI Hongwei

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QI Zhan,CHENG Rijin,WU Xianmin等. Al₂O₃dissolution into molten CaO-SiO₂-Al₂O₃-MgO-FeO slags[J]. Iron and Steel, 2024, 59(2): 65-74.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230339 OR http://www.chinamet.cn/Jweb_gt/EN/Y2024/V59/I2/65

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