钢包引流砂烧结与钢包自动开浇率提升研究进展

doi:10.13228/j.boyuan.issn0449-749x.20210246

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Abstract In order to avoid oxygen lancing when teeming, the studies on the sintering of ladle filler sands and the practices on ladle free-opening are summarized. The sintering properties of filler sands, and the influential factors of ladle free-opening as well as its improvement methods are introduced, while the sintering mechanism of different types of filler sands and the effect of liquid steel on sintering are discussed in detail. As reported, the sintering structures of different types of filler sands are very similar, and generally divided into sintered layer (including partial sintered layer) and non-sintered layer. The thickness of the sintered layer is quite thin, while most of the sand grains are non-sintered. The formation of the liquid phase is the key to the sintering of ladle filler sands, and more liquid generation would result in serious sintering. Proper control of the formation of the liquid phase in ladle filler sands and the thickness of the sintered layer is crucial for the teeming of alloyed steels. The composition and the size of filler sands, steel composition, temperature as well as holding time are the main influential factors to improve ladle free-opening rate. Liquid steel is involved in the sintering process and enhances the formation of the liquid phase, accelerating the sintering. The development of a new kind of filler sands should take the steel composition into account. In general, conventional chromite-based filler sands can obtain a high free-opening rate during the teeming of conventional steel grades. In case of the steel grades containing high contents of alloys (especially Mn and Al), the application result of the chromite-based and zircon-based filler sands is unsatisfied, and new types of ladle filler sands are required to restrain the acceleration of liquid steel on the sintering and improve the ladle free-opening rate.

Key words： filler sand sintering free-opening liquid phase chromite

Received: 27 April 2021

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	DENG Zhi-yin
	PENG Peng
	ZHU Miao-yong

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DENG Zhi-yin,PENG Peng,ZHU Miao-yong. State of art in study on sintering of ladle filler sands and improvement of ladle free-opening rate[J]. Iron and Steel, 2022, 57(1): 1-12.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210246 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I1/1

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