Effect of alumina addition on sintering behavior of chromite-based ladle filler sands
DENG Wei-kai1,2, YANG Bo-ran1,2, GUO Xu-ping1,2, GU Zhi-hui1,2, DENG Zhi-yin1,2, ZHU Miao-yong1,2
1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：In order to understand the effect of alumina grains on the sintering of conventional chromite-based ladle filler sands, laboratory experiments were carried out using the ladle filler sands with different alumina contents. It is found that the influential trends of alumina on the sintering of the sands are very similar, no matter whether liquid steel is employed. When the mass fraction addition of alumina is very low (e.g. no more than 5%), alumina grains will not inhibit, but enhance the sintering of sands. With the increase of alumina content, a weaker sintering result can be found when its mass fraction is sufficiently high (e.g. no less than 10%). Conventional chromite-based ladle filler sands can obtain a good ladle free-opening rate during the practice of conventional Al-killed steel grades, therefore extra alumina addition in the sands is not recommended. Liquid steel would evidently accelerate the sintering of sands, and alumina grains are proved to be practical to constrain the effect of high Mn-high Al steel on the sintering of sands. However, the large amount of alumina should be taken into account, and further studies are still needed.
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2022, Vol. 32 
