Volume 48, Issue 4 e12004
Research Article

Mechanochemical Activation of Argon Oxygen Decarburization Slags for Improved Mineral Carbonation

Luka Ceyssens

Luka Ceyssens

Process Engineering for Sustainable Systems (ProcESS), Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, Leuven, 3001 Belgium

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Nina Miladinović

Nina Miladinović

Process Engineering for Sustainable Systems (ProcESS), Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, Leuven, 3001 Belgium

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Giuseppe Granata

Giuseppe Granata

Process Engineering for Sustainable Systems (ProcESS), Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, Leuven, 3001 Belgium

Sustainable Materials Processing and Recycling (SeMPeR), Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44, Leuven, 3001 Belgium

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Tom Van Gerven

Corresponding Author

Tom Van Gerven

Process Engineering for Sustainable Systems (ProcESS), Department of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, Leuven, 3001 Belgium

E-mail: [email protected]

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First published: 28 February 2025

Abstract

Inspired by the growing need for carbon mitigation strategies, this work investigates mechanochemical activation of argon oxygen decarburization (AOD) slag for CO2 sequestration. It explores three process modes: concurrent, sequential, and staged planetary ball milling and carbonation. Results showed carbonation uptake reached 70 % of the theoretical maximum with ball milling (0.39 g CO2/g AOD slag) versus 0.17 g CO2/g AOD slag without ball milling. The concurrent process resulted in the fastest rate and uptake. Particle agglomeration was confirmed via particle size analysis and electron microscopy, and non-reactive mineral phases were identified through quantitative X-ray diffraction, explaining incomplete carbonation conversion.

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