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Effects and mechanisms of fluorite on the co-reduction of blast furnace dust and seaside titanomagnetite

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Abstract

The co-reduction roasting and grinding magnetic separation‒of seaside titanomagnetite and blast furnace dust was investigated with and without fluorite addition at a reduction roasting temperature of 1250°C for 60 min, a grinding fineness of −43 μm accounting for 69.02wt% of the total, and a low-intensity magnetic field strength of 151 kA/m. The mineral composition, microstructure, and state of the roasted products were analyzed, and the concentrations of CO and CO2 were analyzed in the co-reduction roasting. Better results were achieved with a small fluorite dosage (≤4wt%) in the process of co-reduction. In addition, F− was found to reduce the melting point and viscosity of the slag phase because of the high content of aluminate and silicate minerals in the blast furnace dust. The low moisture content of the blast furnace dust and calcic minerals inhibited the hydrolysis of CaF2 and the loss of F−. Compared with the blast furnace dust from Chengdeng, the blast furnace dusts from Jiugang and Jinxin inhibited the diffusion of F− when used as reducing agents, leading to weaker effects of fluorite.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51474018).

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Authors and Affiliations

  1. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Tian-yang Hu, Ti-chang Sun, Jue Kou, Chao Geng & Yong-qiang Zhao

  2. Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal Mines, Beijing, 100083, China

    Tian-yang Hu, Ti-chang Sun, Jue Kou, Chao Geng & Yong-qiang Zhao

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  1. Tian-yang Hu
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  2. Ti-chang Sun
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  3. Jue Kou
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  4. Chao Geng
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Correspondence to Ti-chang Sun.

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Hu, Ty., Sun, Tc., Kou, J. et al. Effects and mechanisms of fluorite on the co-reduction of blast furnace dust and seaside titanomagnetite. Int J Miner Metall Mater 24, 1201–1210 (2017). https://doi.org/10.1007/s12613-017-1512-4

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  • DOI: https://doi.org/10.1007/s12613-017-1512-4

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