Li Yunyun, Zhang Siqi, Huang Meixiang, Yang Guodong, Li Jiajie, Ma Mengqi, Hu Wentao, Ni Wen
Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, School of Resource and Safety Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Gels. 2025 Mar 11;11(3):193. doi: 10.3390/gels11030193.
This study investigated the feasibility of using semi-dry desulfurization ash (DA) in combination with blast furnace slag (BFS) to prepare gelling materials, aiming to improve the resource utilization of DA. The effects of DA dosage and mechanical grinding on the compressive strength and hydration mechanism of BFS-DA gelling materials were investigated. The results showed that the optimum BFS-DA ratio was 60:40, and the compressive strengths were 14.21 MPa, 20.24 MPa, 43.50 MPa, and 46.27 MPa at 3, 7, 28, and 56 days, respectively. Mechanical grinding greatly improved the activity of the gel materials, with the greatest increase in compressive strength at 3, 7, 28, and 90 days for the BFS and DA mixed milled for 30 min, with increases of 89.86%, 66.36%, 24.56%, and 25.68%, respectively, and compressive strength of 26.22 MPa, 35.6 MPa, 58.33 MPa, and 63.97 MPa, respectively. The cumulative heat of hydration of BFS-DA slurry was about 120 J/g. The hydration mechanism showed that the main hydration products formed were ettringite, C-S-H gel, AFm, and Friedel's salt. Calcium sulfite in DA was participated in the hydration, and a new hydration product, CaAlOSO·11HO, was formed. DA can be effectively used to prepare BFS-based gelling materials, and its performance meets the requirements of GB/T 28294-2024 standard, which provides a potential solution for the utilization of DA resources and the reduction in the impact on the environment.
本研究探讨了利用半干法脱硫灰（DA）与高炉矿渣（BFS）制备胶凝材料的可行性，旨在提高DA的资源利用率。研究了DA掺量和机械粉磨对BFS-DA胶凝材料抗压强度和水化机理的影响。结果表明，BFS与DA的最佳比例为60:40，3、7、28和56天时的抗压强度分别为14.21MPa、20.24MPa、43.50MPa和46.27MPa。机械粉磨大大提高了胶凝材料的活性，BFS和DA混合粉磨30min时，3、7、28和90天的抗压强度增幅最大，分别提高了89.86%、66.36%、24.56%和25.68%，抗压强度分别为26.22MPa、35.6MPa、58.33MPa和63.97MPa。BFS-DA浆料的累计水化热约为120J/g。水化机理表明，主要水化产物为钙矾石、C-S-H凝胶、AFm和Friedel盐。DA中的亚硫酸钙参与了水化反应，形成了一种新的水化产物CaAlOSO·11H₂O。DA可有效用于制备基于BFS的胶凝材料，其性能符合GB/T 28294-2024标准要求，为DA资源利用和减少对环境的影响提供了潜在解决方案。
