Effect of Chemical Additives on Wet Grinding and Activation of Fly Ash
TAN Hongbo1,*, KONG Xianghui1, HE Xingyang2, LI Maogao1, SU Ying2, JIAN Shouwei1, YANG Jin2
1 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China 2 School of Civil Engineering and Environmental Sciences, Hubei University of Technology, Wuhan 430064, China
Abstract: Fly ash (FA), used as mineral admixture, is one of the important means to reduce carbon emission of cementitious materials, but its low early activity is a common concern. In this study, chemical functional components were introduced in wet grinding process to improve the efficiency of FA refinement and activation. The physicochemical property and activity index were evaluated by PSD, pH, ICP, XRD, SEM and TG-DTG, and the synergistic mechanism of liquid lapping mechanical force and chemical dissolution was revealed. The results show that the introduction of TIPA, TEA, NaOH, Na2SO4 and carbide slag (CS) chemical functional components and optimization of liquid environment medium could significantly improve the wet grinding efficiency. When the median particle size of FA was reduced to 2 μm, TIPA+CS had the most significant effect; the grinding time was reduced from 120 min to 40 min, with a decrease by 67%. At 1 day age, Na2SO4 showed the most significant effect, and the activity index of FA reached 60.1%; at 3 d, 7 d and 28 d, TIPA+CS had a good effect, and the activity index reached 81.3%, 89.1% and 97%, respectively. In the process of wet grinding process, liquid environment medium could corrode the surface of fly ash, promote the depolymerization of [AlO4] and [SiO4] on the surface, accelerate ion dissolution, form hydration products such as ettringite and C-S-H gel, and significantly improve the efficiency of refinement and activation.
谭洪波, 孔祥辉, 贺行洋, 李懋高, 苏英, 蹇守卫, 杨进. 化学外加剂对粉煤灰湿法细化活化的影响[J]. 材料导报, 2024, 38(5): 22100005-7.
TAN Hongbo, KONG Xianghui, HE Xingyang, LI Maogao, SU Ying, JIAN Shouwei, YANG Jin. Effect of Chemical Additives on Wet Grinding and Activation of Fly Ash. Materials Reports, 2024, 38(5): 22100005-7.
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2024, Vol. 38 
