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Sulfidation Behaviour of Blast Furnace Dust at High Temperatures

  • METALLURGY OF NONFERROUS METALS
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Abstract

The sulfidation behaviour of blast furnace dust (BFD) with sulfur at high temperatures was investigated. The effects of the sulfur dosage, roasting temperature and time were studied on the basis of thermodynamic calculations. The results revealed that the Zn distribution ratio in ZnS increased from 13.28 to 92.01% after adopting the proposed process. The increase in the sulfur dosage, roasting temperature and time was conducive to the sulfidation of ZnO in the sample, but higher temperatures were not beneficial for sulfidation, which was ascribed to an accelerated volatilization rate of sulfur. The existence of carbon in the sample could decrease the O2 partial pressure, which is advantageous for the generation of ZnS. In addition, it was found that the generated FeO was sulfurized and then proceeded to form iron sulfides. The produced iron sulfides were further dissolved into ZnS to form (Zn, Fe)S compounds. The growth of ZnS particles largely depended upon the roasting temperature, and the growth was significantly accelerated when the temperature increased to 850°C. It is feasible that the sphalerite was transformed into wurtzite at higher temperatures.

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ACKNOWLEDGMENTS

The authors would like to acknowledge the National Natural Science Foundation of China (no. 51604131), the Yunnan Province Applied Basic Research Project (2017FB084), the Foundation of Yunnan Educational Committee, China (No. 2019J0037) and the Testing and Analyzing Funds of Kunming University of Science and Technology (2017T20090159 and 2018T20150055) for financial supports.

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Authors and Affiliations

  1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, 650093, Kunming, China

    Cong-Bing Wang, Lu-Zheng Chen, Jin-Fang Lv & Cui-Cui Ji

  2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, 650093, Kunming, China

    Lu-Zheng Chen, Yong-Xing Zheng & Ling-Yun Huang

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  1. Cong-Bing Wang
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  2. Lu-Zheng Chen
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  4. Jin-Fang Lv
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Correspondence to Yong-Xing Zheng or Jin-Fang Lv.

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Cong-Bing Wang, Chen, LZ., Zheng, YX. et al. Sulfidation Behaviour of Blast Furnace Dust at High Temperatures. Russ. J. Non-ferrous Metals 60, 363–371 (2019). https://doi.org/10.3103/S1067821219040163

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  • DOI: https://doi.org/10.3103/S1067821219040163

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