Resource Utilization Potential of Red Mud: A Study on the Micro-Mechanism of the Synergistic Effect of Multiple Solid Waste Filling Materials

Jiawei Zhang, Guochao Yan (), Xuyang Bai, Shaoqi Kong (), Jiajun Li, Gang Li, Zhiguo Ge and Jinjing Huang
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Jiawei Zhang: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Guochao Yan: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xuyang Bai: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Shaoqi Kong: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jiajun Li: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Gang Li: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Zhiguo Ge: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jinjing Huang: School of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Sustainability, 2023, vol. 15, issue 21, 1-21

Abstract: Red mud (RM) is a common industrial byproduct that is characterized by high alkalinity, high pollution, and difficult utilization. In this paper, gangue (CG), flue gas desulfurization gypsum (FGD), and silicate cement (PC) were used to assist red mud in the preparation of red mud-based composite filler material (RMC), aiming at the large-scale resource utilization of RM. The effects of the mass ratio of RM/CG, the mass ratio of FGD/(RM + CG), and the water–solid ratio (WCR) on the multi-angle properties of RMC were investigated and the optimal ratios were determined. The results showed that the RM/CG was 7:1, FGD/(RM + CG) was 4%, and WCR was 0.51 (RMC8), and the system could increase the RM content to 70%. The microstructural analysis of RMC using a specific surface area and porosity analyzer (BET), X-ray diffractometer (XRD), and scanning electron microscope (SEM) showed that its hydration products could remodel the pore structure, encapsulate and cement the coarse and fine particles into a dense matrix, and play a certain alkali reduction role, which revealed the microscopic synergistic mechanism between multiple solid wastes. The study shows that the comprehensive disposal of RM reduces the pollution released into the environment and provides new ideas for the green development of mines.

Keywords: red mud; sustainable development; resource utilization; cooperative interaction; mine filling materials (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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