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Effect of Fluorspar and Industrial Wastes (Red Mud and Ferromanganese Slag) on Desulfurization Efficiency of Molten Steel

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Abstract

Fluorspar (CaF2) has been widely used to control the physicochemical properties of slag in steelmaking processes. However, it is very important to reduce the CaF2 consumption because it causes various environmental problems. In the current study, therefore, the effect of industrial waste materials such as red mud (RM) and ferromanganese slag (FMS) on the desulfurization behavior of molten steel was investigated to find potential substitutes for fluorspar. Compared to conventional 10 pct CaF2-containing ladle slag, when excess industrial wastes were added (i.e., more than 10 mass pct), the composition of the slag was dramatically changed (SiO2 increases, while FetO and MnO decrease). Therefore, the sulfide capacity of the slag decreased, and the viscosity of the slag increased. Thus, the desulfurization efficiency was also reduced. However, when the RM or FMS were added not more than 10 mass pct to lean-CaF2 (3 pct) slag, the sulfide capacity of the slag was equivalent to 10 pct CaF2-containing ladle slag; thus, the desulfurization efficiency was also equivalent with lower melting point and higher fraction of liquid phase. Consequently, it was confirmed that a small amount (less than 10 mass pct) of industrial wastes can be added as a desulfurization fluxing agent as a partial substitute for fluorspar.

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Acknowledgments

This work was partly supported by the Industrial Strategic Technology Development program (Grant Number 10063056) funded by the Ministry of Trade, Industry & Energy (MOTIE), Korea. In addition, this research was partly funded by the Competency Development Program for Industry Specialists (Grant Number P0002019) of the MOTIE, Korea.

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Authors and Affiliations

  1. Department of Materials Engineering, Hanyang University, Ansan, 15588, Korea

    Tae Su Jeong & Joo Hyun Park

  2. Department of Materials Science and Engineering, KTH Royal Institute of Technology, 100 44, Stockholm, Sweden

    Joo Hyun Park

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  1. Tae Su Jeong
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Correspondence to Joo Hyun Park.

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Manuscript submitted February 16, 2020.

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Jeong, T.S., Park, J.H. Effect of Fluorspar and Industrial Wastes (Red Mud and Ferromanganese Slag) on Desulfurization Efficiency of Molten Steel. Metall Mater Trans B 51, 2309–2320 (2020). https://doi.org/10.1007/s11663-020-01889-7

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