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Investigation of a Two-Stage Aqueous Reactor Design for Carbon Dioxide Sequestration Using Steelmaking Slag

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Abstract

Hydrous carbonate sequestration of carbon dioxide using steelmaking slag was studied using a METSIM process model to analyze experimental data and estimate the reactor operating results. Several scenarios of a two-stage system with water/slag contact in reactor 1 and leachate/carbon dioxide contact in reactor 2 were investigated. These scenarios included batch vs continuous processing and fresh water input vs water recirculation. The METSIM leaching and carbonation models were verified with results obtained from previous slag sequestration experiments. Fresh water additions to reactor 1 allowed the highest leaching efficiency and resulted in excellent carbonation in reactor 2, but a continuous system has a high water demand. Recirculation of the spent leachate minimizes the fresh water addition required, but inhibits the leaching process by producing a calcium carbonate product layer on the slag particles in reactor 1. Increasing the slag surface area, slag/solution ratio, or reactor residence time partially overcomes product layer “blinding.” Optimal residence times were defined for different process parameters and slag particle sizes.

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Acknowledgments

This article was prepared as an account of work sponsored by the United States Department of Energy in cooperation with the American Iron and Steel Institute (AISI) and its participating companies under Agreement No. DE-FC36-97ID13554. Such support does not constitute an endorsement by DOE or AISI of the views expressed in the article. The authors also acknowledge the support of DOFASCO, Gallatin Steel, Hylsa, IPSCO, Mittal Steel, Praxair, Nucor, Timken Company, and U.S. Steel.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO, 65409-0330, USA

    S.N. Lekakh (Research Associate Professor), D.G.C. Robertson (Professor of Metallurgical Engineering), C.H. Rawlins (Graduate Researcher), V.L. Richards (Robert W. Wolf Professor of Metallurgical Engineering) & K.D. Peaslee (F. Kenneth Iverson Steelmaking Chair of Metallurgical Engineering)

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  1. S.N. Lekakh
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  2. D.G.C. Robertson
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  3. C.H. Rawlins
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  4. V.L. Richards
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  5. K.D. Peaslee
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Correspondence to C.H. Rawlins.

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Manuscript submitted October 29, 2007.

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Lekakh, S., Robertson, D., Rawlins, C. et al. Investigation of a Two-Stage Aqueous Reactor Design for Carbon Dioxide Sequestration Using Steelmaking Slag. Metall Mater Trans B 39, 484–492 (2008). https://doi.org/10.1007/s11663-008-9155-5

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  • DOI: https://doi.org/10.1007/s11663-008-9155-5

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