Effect of Carbonated Magnesium Slag Powder on the Carbonation Curing Performance of Magnesium Slag

Dashuai Guo; Hui Guo; Mengen Li; Jinle Dai; Xuemao Guan

doi:10.6919/ICJE.202609_12(9).0031

Authors

Dashuai Guo Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Hui Guo Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Mengen Li Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Jinle Dai Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Xuemao Guan Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China

DOI:

https://doi.org/10.6919/ICJE.202609_12(9).0031

Keywords:

Magnesium Slag; Semi-dry Carbonation; Carbonated Magnesium Slag Powder; Compressive Strength.

Abstract

This study proposes a waste valorization strategy in which carbonated magnesium slag powder (CMSP), prepared by semi-dry carbonation, is reused in a magnesium slag carbonation curing system. The preferred powder preparation conditions were a liquid-to-solid (L/S) ratio of 0.20 and a carbonation time of 4 h. Under identical conditions of a compaction pressure of 10 MPa, a carbonation time of 2 h, and an L/S ratio of 0.08, replacing 10% of the untreated magnesium slag with CMSP increased the compressive strength to 103.06 MPa, representing a 41.3% improvement over the specimen without CMSP. Subsequent sequential single-factor experiments identified a combination of 10% CMSP replacement, an L/S ratio of 0.10, a compaction pressure of 8 MPa, and a carbonation time of 8 h, at which the compressive strength and CO₂ uptake reached 108.45 MPa and 15.5%, respectively. These latter values reflect the combined effects of CMSP incorporation and changes in processing conditions. X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy confirmed the presence of crystalline calcite in the carbonated products and revealed changes in local microstructure and carbonate-related signals after CMSP incorporation. The results provide a basis for reusing CMSP in carbonation-cured magnesium slag products.

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