钢包顶渣改质对抑制旋涡卷渣的影响

doi:10.13228/j.boyuan.issn1005-4006.20220008

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Abstract Ladle capping can improve the thermal insulation effect of the ladle, which is beneficial for saving energy and reducing consumption for steel plant. However, under ladle capping condition, the temperature of top slag is higher and the flow is better, which is more likely to cause the vortex slag at the end of casting and increase the defect rate of slag inclusion.Method of ladle slag modification to suppress slag entrapment by vortex is proposed and studied in this paper. Taking the high basicity reducing slag as the research object, basic idea of slag modification was clarified through phase diagram analysis. Viscosity values of designed slag modification schemes were calculated by FactSage software. The results showed that adding lime or light burnt dolomite could help to increase the viscosity of ladle slag, and the viscosity increasing effects of them were similar. The above conclusions were also verified by the slag viscosity measurement experiment. Industrial experiment was carried out based on BaCO₃ tracer method. The results showed that the number of large particle inclusions decreased significantly. After the application of the new top slag modification technology, the averaged slag entrapment defect rate has been reduced from 0.57% to 0.42%.

Key words： ladle capping slag entrapment by vortex ladle slag modification inclusion slab quality

Received: 24 January 2022

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	Articles by authors
	WU Xu-feng
	ZHANG Cai-gui
	WANG De-yong

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WU Xu-feng,ZHANG Cai-gui,WANG De-yong. Effect slag modification on vortex entrapment in ladle[J]. CONTINUOUS CASTING, 2022, 41(2): 41-46.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220008 OR http://www.chinamet.cn/Jweb_lz/EN/Y2022/V41/I2/41

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