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A platform for research: civil engineering, architecture and urbanism
Promotion effects of gypsum on carbonation of aluminates in medium Al ladle furnace refining slag
Graphical abstract Display Omitted
Highlights Effects of gypsum on carbonation of MAS was investigated. Carbonation curing significantly improves strength of MAS–gypsum samples. Gypsum promotes both the strength and CO2 uptake of carbonation-cured MAS samples. It is feasible to make building materials through MAS–gypsum CO2 mineralization.
Abstract Medium Al ladle furnace refining slag (MAS) can potentially absorb CO2 owing to its high percentages of active Ca, Mg and Al. However, it was hardly focused on. Here, the effects of gypsum on the compressive strength and CO2 uptake of carbonation-cured MAS blocks were evaluated. Carbonation curing improved the strength of MAS–gypsum samples by 1.57–3.64 times. Moreover, 8.33% gypsum promoted the strength and CO2 uptake of 24-h carbonation curing MAS samples by 97.82% and 24.69%, respectively. Microanalysis indicates that Gypsum stimulates reactivity of aluminates and shifts the hydration products of aluminates from C4AHx to ettringite and hemicarboaluminate. They were then carbonated into calcite and monocarboaluminate in CO2-rich environments. Adding gypsum contributes to an increase in carbonation products amount. The carbonation products filled the pores and bound the MAS particles, thereby enhancing the strength of MAS. This study preliminarily proves the feasibility of CO2 mineralization of MAS–gypsum for building materials.
Promotion effects of gypsum on carbonation of aluminates in medium Al ladle furnace refining slag
Graphical abstract Display Omitted
Highlights Effects of gypsum on carbonation of MAS was investigated. Carbonation curing significantly improves strength of MAS–gypsum samples. Gypsum promotes both the strength and CO2 uptake of carbonation-cured MAS samples. It is feasible to make building materials through MAS–gypsum CO2 mineralization.
Abstract Medium Al ladle furnace refining slag (MAS) can potentially absorb CO2 owing to its high percentages of active Ca, Mg and Al. However, it was hardly focused on. Here, the effects of gypsum on the compressive strength and CO2 uptake of carbonation-cured MAS blocks were evaluated. Carbonation curing improved the strength of MAS–gypsum samples by 1.57–3.64 times. Moreover, 8.33% gypsum promoted the strength and CO2 uptake of 24-h carbonation curing MAS samples by 97.82% and 24.69%, respectively. Microanalysis indicates that Gypsum stimulates reactivity of aluminates and shifts the hydration products of aluminates from C4AHx to ettringite and hemicarboaluminate. They were then carbonated into calcite and monocarboaluminate in CO2-rich environments. Adding gypsum contributes to an increase in carbonation products amount. The carbonation products filled the pores and bound the MAS particles, thereby enhancing the strength of MAS. This study preliminarily proves the feasibility of CO2 mineralization of MAS–gypsum for building materials.
Promotion effects of gypsum on carbonation of aluminates in medium Al ladle furnace refining slag
Wang, Xue (author) / Ni, Wen (author) / Wei, Xinlei (author) / Zhang, Siqi (author) / Li, Jiajie (author) / Hu, Wentao (author)
2022-04-16
Article (Journal)
Electronic Resource
English
BE , Binding energy , CCS , Carbon capture and storage , MAS , Medium Al ladle furnace refining slag , SEM , Scanning electron microscopy , EDS , Energy dispersive spectroscopy , QXRD , Quantitative X-ray diffraction , CIF , Crystal information files , XPS , X-ray photoelectron spectroscopy , Ladle furnace slag , Gypsum , CO<inf>2</inf> uptake , Compressive strength
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