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Rapid Dissolution of Quicklime into Molten Slag by Internally Formed Gas

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Abstract

In steelmaking process, quicklime is used to produce CaO-based slag. Although rapid dissolution of quicklime is required for high-efficiency refining, it is known that the rate decreases when dicalcium silicate (C2S) layer forms around the quicklime by reacting with slag. The equation that driving force is the difference of CaO content between in slag and a liquid phase of slag saturated by C2S has been often used for estimating the dissolution rate of lime, in which this saturated value is thermodynamically determined. The authors, however, revealed that the quicklime used in actual operation showed much faster dissolving rate than that of completely calcined lime that is covered by C2S layer during dissolution into slag. This was caused by a gas formation due to a thermal decomposition of residual limestone existed in quicklime. In this study, the dissolution rate of quicklime with the gas formation is quantitatively investigated.

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Acknowledgments

This study was supported by the 23rd ISIJ Research Promotion Grant. We are grateful to all the members of the ISIJ research committee in Slag formation with high-speed lime dissolution for helpful discussions. Quicklime used in this study was supplied from Yoshizawa Lime Industry Co., Ltd. The authors also acknowledge Mr. A. Ito and Ms. M. Hayasaka at Tohoku University for their experimental assistance and Professor Kitamura at Tohoku University for allowing us to use experimental equipment and for useful discussion.

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Authors and Affiliations

  1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira Aoba-ku, Sendai, 980-8577, Japan

    Nobuhiro Maruoka (Assistant Professor) & Hiroshi Nogami (Professor)

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  1. Nobuhiro Maruoka
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  2. Hiroshi Nogami
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Correspondence to Nobuhiro Maruoka.

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Manuscript submitted October 29, 2015.

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Maruoka, N., Nogami, H. Rapid Dissolution of Quicklime into Molten Slag by Internally Formed Gas. Metall Mater Trans B 48, 113–118 (2017). https://doi.org/10.1007/s11663-016-0741-7

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