Nie Miaomiao, Li Shefeng, Li Xuli, Bao Shenxu, Chen Pei, Zhang Yong, Ding Siyu, Li Jiale
School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Hubei Engineering Research Center for Soil and Groundwater Pollution Control, Wuhan 430070, China.
Molecules. 2024 Apr 29;29(9):2056. doi: 10.3390/molecules29092056.
In order to comprehensively utilize iron ore tailings (IOTs), the possibility of using IOTs as raw materials for the preparation of cementitious composites (IOTCCs) was investigated, and IOTCC was further applied to mine interface pollution control. The mechanical properties, hydration products, wind erosion resistance, and freeze-thaw (F-T) cycle resistance of IOTCCs were evaluated rigorously. The activity index of iron tailings increased from 42% to 78% after grinding for 20 s. The IOTCC was prepared by blending 86% IOT, 10% ground granulated blast-furnace slag (GGBS), and 4% cement clinker. Meanwhile, the hydration products mainly comprised ettringite, calcium hydroxide, and C-S-H gel, and they were characterized via XRD, IR, and SEM. It was observed that ettringite and C-S-H gel were principally responsible for the strength development of IOTCC mortars with an increase in curing time. The results show that the kaolinite of the tailings was decomposed largely after mechanical activation, which promoted the cementitious property of IOT.
为了综合利用铁矿石尾矿（IOTs），研究了将IOTs用作制备胶凝复合材料（IOTCCs）原料的可能性，并将IOTCC进一步应用于矿山界面污染控制。对IOTCCs的力学性能、水化产物、抗风蚀性和抗冻融（F-T）循环性进行了严格评估。铁尾矿研磨20 s后活性指数从42%提高到78%。IOTCC由86%的IOT、10%的磨细粒化高炉矿渣（GGBS）和4%的水泥熟料混合制备。同时，水化产物主要由钙矾石、氢氧化钙和C-S-H凝胶组成，并通过XRD、IR和SEM对其进行了表征。观察到随着养护时间的增加，钙矾石和C-S-H凝胶是IOTCC砂浆强度发展的主要原因。结果表明，尾矿中的高岭石在机械活化后大量分解，促进了IOT的胶凝性能。
