基于正交试验的拜耳法赤泥活化机理及性能分析

doi:10.11896/cldb.21040130

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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.

Key words： Bayer red mud orthogonal experiment activation mechanism performance activity index calcination hydration product

Published: 25 August 2022 Online: 2022-08-29

CLC number:

TQ172.9

Fund:Natural Science Foundation of Henan Province (182300410259) and Innovative Education Program for Graduate Students at North China University of Water Resources and Electric Power (YK2020-14).

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	LI Keliang
	SONG Ziming

Cite this article:

LI Keliang,SONG Ziming. Analysis of Bayer Red Mud Activation Mechanism and Performance Based on Orthogonal Experiment[J]. Materials Reports, 2022, 36(16): 21040130-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21040130 OR http://www.mater-rep.com/EN/Y2022/V36/I16/21040130

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