钢渣粉低液固比固碳工艺及固碳钢渣粉对水泥基材料性能的影响

doi:10.11896/cldb.23060132

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Abstract The mineral carbon sequestration for CO₂ absorption is crucial for reducing the greenhouse effect. Steel production enterprises can achieve synergistic disposal by reacting steel slag with exhaust gas CO₂ and waste heat. In this paper, the optimum process of steel slag carbon sequestration under low liquid-solid ratio (wetting state) was studied. The optimum carbon fixation reaction parameters were determined as follows: reaction temperature 100 ℃, liquid-solid ratio 9%, reaction time 60 min, CO₂ pressure 0.4 MPa. Under this process condition, the carbon fixation of steel slag powder can reach 119.1 g CO₂/kg, and the carbon fixation product is mainly calcite calcium carbonate. On this basis, the effects of carbon-fixing steel slag powder on cement stability, standard consistency water demand, setting time, hydration heat release and mortar strength were studied. The results showed that the volume stability of steel slag powder is significantly improved after carbon fixation. Compared with uncarbon-fixing steel slag powder, there is no adverse effect on the water demand of cement paste standard consistency. The retarding effect of carbon-fixing steel slag on cement setting and hardening is weakened, and the weakening effect is enhanced with the increase of carbon fixation rate. Carbon-fixing steel slag powder can improve the 3 d, 7 d and 28 d compressive strength of cement mortar at low content (10%), but when the content is too high (＞30%), it will significantly reduce the 3 d, 7 d and 28 d compressive strength of cement mortar. XRD test shows that CaCO₃ can hydrate to form single-carbon hydrated calcium carboaluminate (C₃A·CaCO₃·11H₂O) and semi-carbon hydrated calcium carboaluminate (C₃A·0.5CaCO₃·0.5Ca(OH)₂·11.5H₂O). Low liquid-solid ratio carbon fixation is helpful for iron and steel enterprises to achieve carbon neutralization, and can also improve the volume stability of steel slag, so that steel slag powder can be used more effectively.

Key words： steel slag mineral carbon sequestration carbon sequestration rate soundness calcium carboaluminate hydrate

Published: 10 July 2024 Online: 2024-08-01

CLC number:

TU528

Fund:Natural Science Foundation of Shaanxi Province (2021JM-353).

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	WU Yonghua
	KUANG Yufeng
	YI Ang
	HE Juan
	YUAN Yibing

Cite this article:

WU Yonghua,KUANG Yufeng,YI Ang, et al. Low Liquid-Solid Ratio Carbon Fixation Process with Steel Slag Powder and the Effect of Carbon Fixation Steel Slag Powder on the Properties of Cement-based Materials[J]. Materials Reports, 2024, 38(13): 23060132-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23060132 OR http://www.mater-rep.com/EN/Y2024/V38/I13/23060132

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