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Desulfurization of rejected electrolytic manganese metal by electroslag remelting furnace with a water-cooled electrode

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Abstract

Remelting rejected electrolytic manganese metal (EMM) scrap was investigated by electroslag remelting (ESR) process through industrial experiment. The results indicated that the ANF-6 slag (70 wt.% CaF2 + 30 wt.% Al2O3) and deoxidizer could promote the desulfurization of ESR manganese in an air atmosphere. Under an air atmosphere, the sulfur in the ingot decreased to 0.0534 wt.% with a desulfurization ratio of ESR manganese of 53.2% by using ANF-6 slag and water-cooled copper electrode electroslag remelting rejected EMM scrap, suggesting its efficient removal. The electroslag ingots exhibited uneven chemical composition in an air atmosphere and cooling condition of the ESR process. The metal manganese could be oxidized by electroslag remelting of rejected EMM scrap in an air atmosphere with MnO content in the final slag of 21.9 wt.%. Besides, the activity of MnO in slag increased with increasing remelting temperature, resulting in a reduction in the slag–manganese sulfur partition ratio and desulfurization ratio. Moreover, with the accumulation of sulfur in slag and the oxidation of metallic manganese liquid, the slag showed a lower cleanliness and more oxidation, leading to an increase in sulfur and oxygen content in the electroslag ingot with the increase in ingot height.

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Acknowledgements

The authors appreciate the financial support from the National Natural Science Foundation of China (Grant No. 51804227).

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Authors and Affiliations

  1. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243002, Anhui, China

    Ru Lu & Hai-chuan Wang

  2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Ran-ran Yu, Guang-qiang Li, Yu Liu & Qiang Wang

  3. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Ran-ran Yu, Guang-qiang Li, Yu Liu & Qiang Wang

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  1. Ru Lu
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Correspondence to Qiang Wang or Hai-chuan Wang.

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Lu, R., Yu, Rr., Li, Gq. et al. Desulfurization of rejected electrolytic manganese metal by electroslag remelting furnace with a water-cooled electrode. J. Iron Steel Res. Int. 30, 1411–1425 (2023). https://doi.org/10.1007/s42243-023-01005-4

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