Fabrication of baking-free bricks from iron ore tailings

被引：0
作者：
Chen H. [1 ]
Wang Z. [1 ]
Pei L. [1 ]
Xue Z. [1 ]
Yu C. [1 ]
Fan C. [1 ]
机构：
[1] School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui
来源：
Current Materials Science | 2020年 / 13卷 / 02期
关键词：
Baking-free tailing bricks; Compressive strength; Density; Iron ore tailings; Scanning electron microscopy; Slag;
D O I：
10.2174/2666145413666200319130050
中图分类号：
学科分类号：
摘要：
Background: Tailings produced from iron ore smelting processes have increased dra-matically in recent decades. The storage of tailings not only needs high cost, but also causes a great environmental and safety hazard. Therefore, it is urgent to use new technologies to comprehensive-ly utilize tailings. Methods: The phases and micro-morphology of the baking-free bricks were investigated by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The optimal components and preparation parameters of the baking-free bricks were determined by controlling the ratio of the raw materials and forming pressure. The compressive strength and density of the baking-free bricks were analyzed by controlling the forming pressure and curing time. Results: The optimal components of the baking-free bricks are 65wt.% tailings, 5wt.% titanium gypsum, 17wt.% slag, 5wt.% acetylene sludge, 8wt.% waste brick powder. The optimal forming pressure is 10MPa. 28 d compressive strength and density of the baking-free bricks reach 19.8 MPa and 1622.92 kg.m-3, respectively. Irregular particles and ettringite (Aft) nanorods in the baking-free bricks contribute to the improvement of the compressive strength and compactness of the tailing bricks. Conclusion: Baking-free bricks were successfully prepared from iron ore tailings by pressure forming method and exhibited great application promising in the construction field. © 2020 Bentham Science Publishers.
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页码：97 / 110
页数：13
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