The technological process of steel smelting at “ArcelorMittal Temirtau” JSC includes three stages: converter smelting of semi-finished products, ladle treatment, and continuous casting of slabs. According to the current technology, a desired flowability of the refining slag is created in the ladle-furnace unit by thinner additives, such as fluorspar. When using fluorspar, toxic fluorine emissions aggravate the environmental situation at the worksite. In addition, the presence of fluoride compounds in the slag adversely affects the durability of the ladle lining. Without modifying the technological process and the consumption of slag-forming agents (lime), solid slag mixtures, based on aluminum oxide, can be used in the ladle-furnace unit to eliminate fluorine emissions into the workshop atmosphere, neutralize the negative effect on the resistance of the ladle lining slag belt, as well as reduce the cost of steel due to the refusal of fluorspar and reduced consumption of aluminum for slag deoxidization.
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Translated from Metallurg, Vol. 67, No. 8, pp. 13–17, August, 2023.
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Zolin, A.N., Dobromilov, A.A., Esilbaev, R.D. et al. Application of Solid Slag Mixtures Based on Aluminum Oxide in Smelting Low-Sulfur Steels. Metallurgist 67, 1078–1085 (2023). https://doi.org/10.1007/s11015-023-01599-w
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DOI: https://doi.org/10.1007/s11015-023-01599-w