Analysis of Bayer Red Mud Activation Mechanism and Performance Based on Orthogonal Experiment
LI Keliang1,2,*, SONG Ziming1
1 School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, China 2 Waste Utilization Technology and Equipment Engineering Research Center of Henan Province, Zhengzhou 450045, China
Abstract: Huge emission, serious pollution and low activity are main characteristics of Bayer red mud, which make it difficult to directly utilize Bayer red mud in cementitious material. In this work, the particle size distribution and the particle morphology were analyzed by laser particle size analyzer (LPA) and scanning electron microscope (SEM), while the mineral composition and the mineral transformation with temperature were cha-racterized by X-ray diffraction (XRD) and the thermogravimetric analysis (TGA), with the activation mechanism of Bayer red mud analyzed further. The orthogonal experiments were used to optimize the activation conditions of Bayer red mud. The effects of specific surface area and calcination temperature of Bayer red mud on the compressive strength and the hydration products of the composite cementitious material were analyzed. Mechanical grinding significantly increases the specific surface area and the water requirement of the Bayer red mud, but brings the agglomeration of fine particles. During the low-temperature calcination process, gibbsite, hibschite and cancrinite transform to form a metastable aluminosilicate, which effectively improves the reaction activity of Bayer red mud. After calcination at 600 ℃ for 0.5 h, the activity index of Bayer red mud is as high as 95.93%,which is 32.5% higher than that of the mud treated under room temperature (R.T.). When Bayer red mud calcined at 600 ℃ is used, the peak value of hydration heat rate of the composite cementitious material is the largest, and it appears firstly. The hydration products of the composite cementitious material mainly include C-S-H gel and calcium hydroxide. The Bayer red mud with higher activity can reacts with more calcium hydroxide.
李克亮, 宋子明. 基于正交试验的拜耳法赤泥活化机理及性能分析[J]. 材料导报, 2022, 36(16): 21040130-7.
LI Keliang, SONG Ziming. Analysis of Bayer Red Mud Activation Mechanism and Performance Based on Orthogonal Experiment. Materials Reports, 2022, 36(16): 21040130-7.
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