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Purification performance on molten steel of novel Al2O3-based ceramic filter prepared from microporous powder and nano-Al2O3 powder

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Abstract

Reticulated ceramic foam filters provide an effective way to purify molten steel by removing non-metallic inclusions. We proposed a novel strategy to improve the purification performance of Al2O3-based ceramic filters by using microporous corundum–spinel raw materials to replace dense raw materials. Three kinds of Al2O3-based ceramic filters fabricated from dense α-Al2O3 micro-powder or microporous corundum–spinel powder were selected to carry out the immersion tests with molten steel. On the one hand, the higher surface roughness of the filter skeleton prepared from microporous raw materials increased the adsorption capacity of skeleton surface on inclusions in molten steel. On the other hand, the higher apparent porosity and larger pore size of the filter skeleton were more beneficial to the penetration of molten steel in the micropores of skeleton. The reaction process at the solid–liquid interface also improved the wettability of the interface between skeleton and molten steel, resulting in a larger penetration depth and a better adsorption effect on the inclusions. In summary, the novel Al2O3-based ceramic filter prepared with microporous corundum–spinel powder and addition of 5 wt.% nano-Al2O3 powder reduced the total oxygen content of the steel from 40.2 × 10−4 to 12.7 × 10−4 wt.% by 68.4% and the Al content from 0.46 to 0.18 wt.% by 60.9% after immersion test, presenting the most excellent purification performance on molten steel.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51974214).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Zhe Chen, Wen Yan, Ying Liu, Guang-qiang Li & Nan Li

  2. Jiangsu Shengnai New Materials Co., Ltd., Taizhou, 225534, Jiangsu, China

    Shao-song Hong

Authors
  1. Zhe Chen
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  2. Wen Yan
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  3. Ying Liu
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  4. Guang-qiang Li
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Correspondence to Wen Yan.

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Chen, Z., Yan, W., Liu, Y. et al. Purification performance on molten steel of novel Al2O3-based ceramic filter prepared from microporous powder and nano-Al2O3 powder. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-024-01230-5

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  • DOI: https://doi.org/10.1007/s42243-024-01230-5

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