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Strength and Bonding Mechanism of Nonhydraulic Cementitious Binders: Reutilization of MgO in Basic Oxygen Furnace Dust

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Abstract

Basic Oxygen Furnace (BOF) dust is a secondary resource with high total iron (TFe) content produced in metallurgical steelmaking process. It is the most economical way to recycle BOF dust by adding binders to prepare cold-bonded pellets and returning to BOF for steelmaking. Nevertheless, the digestion reaction of dead-burned MgO and CaO contained in BOF dust causes expansion and cracking of the pellets. Based on the hydration mechanism of nonhydraulic cementitious materials, it was first proposed to use the dead-burned MgO contained in BOF dust as a binder raw material, mixed with MgCl2 or KH2PO4 to form magnesium oxychloride (MOC) or magnesium potassium phosphate (MKP) binder to prepare cold-bonded pellets, while simultaneously consuming MgO and reducing the expansion stress generated by digestion reaction. In this paper, a comparative analysis of strength and bonding mechanism of the two binders is carried out to lay the foundation theory for their rational application. The results show that MKP and MOC binders are beneficial to improve the early and later strength of pellets respectively. The acicular 5 phase crystals formed by MOC binder have strong surface polarity and high bonding strength. They are interlocked to generate a network structure, which forms a unified whole with high strength after the dust particles are wrapped; the prismatic K-Struvite crystals formed by MKP binder have strong intermolecular force and high binder self-strength. They are embedded in the gaps between the dust particles and form solid bridges to improve the pellet strength.

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Acknowledgments

The authors are very grateful for support from the National Natural Science Foundation of China (Grant No. 51574050).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, P. R. China

    Xiang Li, Ping Tang, Qu Fu, Peng He & Guanghua Wen

  2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing, 400044, P. R. China

    Xiang Li, Ping Tang, Qu Fu, Peng He & Guanghua Wen

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  1. Xiang Li
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  2. Ping Tang
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Correspondence to Ping Tang.

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Manuscript submitted October 8, 2020; accepted January 23, 2021.

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Li, X., Tang, P., Fu, Q. et al. Strength and Bonding Mechanism of Nonhydraulic Cementitious Binders: Reutilization of MgO in Basic Oxygen Furnace Dust. Metall Mater Trans B 52, 1322–1332 (2021). https://doi.org/10.1007/s11663-021-02095-9

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