Fabrication of Baking-free Bricks from Iron Ore Tailings

Author(s): Hongjun Chen, Zi Wang, Lizhai Pei*, Zeyang Xue, Chunhu Yu, Chuangang Fan

Journal Name: Current Materials Science
Formerly Recent Patents on Materials Science

Volume 13 , Issue 2 , 2020


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Abstract:

Background: Tailings produced from iron ore smelting processes have increased dramatically 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 comprehensively 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.

Keywords: Baking-free tailing bricks, iron ore tailings, slag, compressive strength, density, scanning electron microscopy.

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Article Details

VOLUME: 13
ISSUE: 2
Year: 2020
Published on: 15 January, 2021
Page: [97 - 110]
Pages: 14
DOI: 10.2174/2666145413666200319130050
Price: $65

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