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Effect of silica-alumina molar ratio on iron ore tailings-based geopolymer eco-brick performance
Xinyuan Zhan1, Pengcheng Zhao2, Jin Wang1
1School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China; Anhui Engineering Research Center of Industrial Wastewater Treatment and Resource Recovery, Hefei University of Technology, Hefei, Anhui, 230009, China; Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes, Hefei University of Technology, Hefei, Anhui, 230009, China.
Abstract:
The large accumulation of iron ore tailings (IOT) can easily lead to serious environmental pollution and dam-break risk. In this study, IOT was used together with silica fume and bauxite to prepare geopolymer eco-bricks (IEB). The influences of silica-alumina (Si/Al) molar ratio on compressive strength, water loss, alkalinity, gel products, microstructure and pore distribution were investigated. The formation and efflorescence mechanisms of IEB were revealed using XRD, FTIR, SEM and MIP analyses. The IEB with a Si/Al molar ratio of 1.98 exhibited the best comprehensive performance, and the content of N(C)-(A)-S-H gel exhibited a trend of initial increase followed by a decrease. The formation process of IEB involves the dissolution of Si-Al components, monomer condensation and gel formation, and the construction of a three-dimensional network structure. Both the Si/Al molar ratio and pore structure affected the efflorescence degree, and an appropriate proportion can reduce efflorescence. Soaking in 3% FeSO4 solution was an ideal chemical method for alkali reduction. Elymus dahuricus and Puccinellia tenuiflora were suitable for planting on IEB. This study provides theoretical support for the performance optimization, practical application and large-scale resource utilization of IEB.
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