Submit Manuscript  

Article Details


Fabrication of Baking-free Bricks from Iron Ore Tailings

[ Vol. 13 , Issue. 2 ]

Author(s):

Hongjun Chen, Zi Wang, Lizhai Pei*, Zeyang Xue, Chunhu Yu and Chuangang Fan   Pages 97 - 110 ( 14 )

Abstract:


<P>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. </P><P> 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. </P><P> 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. </P><P> Conclusion: Baking-free bricks were successfully prepared from iron ore tailings by pressure forming method and exhibited great application promising in the construction field.</P>

Keywords:

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

Affiliation:

School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002, School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, Anhui 243002

Graphical Abstract:



Read Full-Text article