Study on Mineral Compositions of Direct Carbonated Steel Slag by QXRD, TG, FTIR, and XPS

Xue Wang, Wen Ni, Jiajie Li, Siqi Zhang and Keqing Li
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Xue Wang: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Wen Ni: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jiajie Li: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Siqi Zhang: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Keqing Li: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

Energies, 2021, vol. 14, issue 15, 1-18

Abstract: Steel slag CO 2 sequestration helps mitigate global warming and decrease the stockpile of steel slag (SS). Through orthogonal design tests and single-factor tests, this paper evaluated the effects of the water/solid mass ratio (w/s), gypsum ratio (G/SS), molding pressure, and curing duration on uniaxial compressive strength (UCS) and CO 2 uptake of the compacts. The results indicated that high w/s enhanced both strength and CO 2 capture ability. The proper addition of gypsum helps promote UCS increase and CO 2 uptake of steel slag. In addition, increasing the molding pressure can significantly improve UCS without reducing CO 2 uptake. The optimum conditions in the study were a w/s of 0.20, G/SS of 1/16, and molding pressure of 27 MPa, under which conditions 1 d UCS and CO 2 uptake were 55.30 MPa and 12.36%, respectively. Microanalyses showed that gypsum activates mainly mayenite in steel slag. An increase in water addition also increased the hydration and carbonation products greatly, and the strengthened molding pressure had a significant densification effect on micro-pore structures. The study gives guidance in the application of steel slag in CO 2 capture and manufacturing green construction material.

Keywords: carbon capture; orthogonal test design; gypsum; steel slag; UCS; XPS (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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