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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摘要钢包加盖能够显著提升钢包的保温效果,助力钢铁企业节能降耗。但钢包加盖条件下顶渣温度较高、流动性好,更易引起浇注末期旋涡卷渣,铸坯夹渣缺陷率升高。开展了顶渣改质抑制旋涡卷渣的工艺研究,以高碱度渣为研究对象,通过相图分析确定了炉渣改质增黏的基本思路,利用FactSage软件对多组改质渣系进行黏度计算。结果表明,添加石灰或轻烧白云石都有助于增大炉渣黏度,两者增黏效果相近,炉渣黏度测量试验也验证了上述结论。利用BaCO₃示踪法开展了顶渣改质的工业试验,结果表明,炉渣改质后钢中大尺寸夹杂物数量大大减少。顶渣改质新工艺在现场应用后,铸坯平均夹渣缺陷率由0.57%降低至0.42%。

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	吴旭峰
	张才贵
	王德永

关键词 ：钢包, 旋涡卷渣, 顶渣改质, 夹杂物, 铸坯质量

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

收稿日期: 2022-01-24

引用本文:

吴旭峰, 张才贵, 王德永. 钢包顶渣改质对抑制旋涡卷渣的影响[J]. 连铸, 2022, 41(2): 41-46. WU Xu-feng, ZHANG Cai-gui, WANG De-yong. Effect slag modification on vortex entrapment in ladle. CONTINUOUS CASTING, 2022, 41(2): 41-46.

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