Browse > Article
http://dx.doi.org/10.7844/kirr.2022.31.6.44

A Study on the Replacement of a Light Burnt Dolomite with a Waste MgO-C Refractory Material for a Steel-Making Flux in Electric Arc Furnace  

Hyun-Jong Kim (Department of Metallurgical Engineering, Pukyong National University)
Jong-Deok Lim (Department of Metallurgical Engineering, Pukyong National University)
Hang-Goo Kim (Major of Energy & Resources Engineering, Korea Maritime & Ocean University)
Jei-Pil Wang (Division of Convergence Materials Engineering, Major of Metallurgical Engineering, Department of Marine Convergence Design Engineering(Advanced Materials Engineering))
Publication Information
Resources Recycling / v.31, no.6, 2022 , pp. 44-51 More about this Journal
Abstract
In the steelmaking process using an electric arc furnace (EAF), light-burnt dolomite, which is a flux containing MgO, is used to protect refractory materials and improve desulfurization ability. Furthermore, a recarburizing agent is added to reduce energy consumption via slag foaming and to induce the deoxidation effect. Herein, a waste MgO-C based refractory material was used to achieve the aforementioned effects economically. The waste MgO-C refractory materials contain a significant amount of MgO and graphite components; however, most of these materials are currently discarded instead of being recycled. The mass recycling of waste MgO-C refractory materials would be achievable if their applicability as a flux for steelmaking is proven. Therefore, experiments were performed using a target composition range similar to the commercial EAF slag composition. A pre-melted base slag was prepared by mixing SiO2, Al2O3, and FeO in an alumina crucible and heating at 1450℃ for 1 h or more. Subsequently, a mixed flux #2 (a mixture of light-burnt dolomite, waste MgO-C based refractory material, and limestone) was added to the prepared pre-melted base slag and a melting reaction test was performed. Injecting the pre-melted base slag with the flux facilitates the formation of the target EAF slag. These results were compared with that of mixed flux #1 (a mixture of light-burnt dolomite and limestone), which is a conventional steelmaking flux, and the possibility of replacement was evaluated. To obtain a reliable evaluation, characterization techniques like X-ray diffraction (XRD) analysis and X-ray fluorescence (XRF) spectrometry were used, and slag foam height, slag basicity, and Fe recovery were calculated.
Keywords
Steelmaking; Light burned dolomite; Wasted MgO-C refractory; Slag; Substitutable rate;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Seiji Hanagiri, Akihiro Shimpo, Takayuki Inuzuka et al., 2008 : Recent Improvement of Recycling Technology for Refractories, Nippon Steel Technical Report, 98, pp.93-98
2 Kyei-Sing Kwong, James P. Bennett, 2022 : Recycling Practices of Spent MgO-C Refractories, Journal of Minerals & Materials Characterization & Engineering, 1(2), pp.69-78.   DOI
3 D. Capodilupo, P, Masucci, G. Brascugli, et al., 1990 : Operating Improvements in Electric Steel Production on Terni EAF after Introduction of Slag Foaming Parctice. IISC, The Sixth Interational Iron and Steel Congress, ISIJ, Nagoya. Japan. 21-26 Oct. 1990, 4, pp.98-104.
4 Liesbeth Horckmans, Peter Nielsen, Philippe Dierckx, et al., 2019 : Recycling of refractory bricks used in basic steelmaking: A review, Resour Conserv Recycl., 140, pp. 297-304.   DOI
5 Sang-Ho Chun, Choong-Ok Song, Bong-Chan Ban, 2006 : Journal of Korean Inst. Of Resources Recycling, 15(2), pp 18-23.
6 A. P. Luz, T. A. Avila, P. Bonadia, et al., 2011 : Slag Foaming: Fundamentals, Experimental Evaluation and Application in the Steelmaking Industry, Refractories Worldforum, 3(2), pp. 91-98.
7 M. Skaf, J. M. Manso, A. Aragon, et al., 2017 : EAF slag in asphalt mixes: A brief review of its possible re-use, Resour. Conserv. Recycl., 120, pp.176-185.   DOI
8 H. Yi, G. Xu, H. Cheng, et al., 2012 : An overview of utilization of steel slag, In Proceedings of the 7th International Conference on Waste Management and Technology, IEEA, Beijing, China, pp.791-801.
9 Ping Wang, Qing-min Meng, Hong-ming Long, et al., 2016 : Influence of Basicity and MgO on Fluidity and Desulfurization Ability of High Aluminum Slag, High Temp, Meter. Proc., 35(7), pp.669-675   DOI
10 V. D. Eisenhuttenleute, 1995 : Ternary Phase Diagram of CaO- SiO2-MgO (at 20% Al2O3), Slag Atlas, 156, 2nd editon, Verlag Stahleisen GmbH, Dusseldorf.
11 Thiago da Costa Avelar, Felipe Fardin Grillo, Eduardo Junca, et al., 2018 : Evaluation of recycled MgO-C bricks and dead-burned dolomite fines in setting slag foaming in the electric arc furnace, REM, Int. Eng. J., 71(1), pp.67-74.   DOI
12 A.N. Conejo, R.G. Lule, F.Lopez, et al., 2006 : Recycling MgO-C refractory in Electric Arc Furnaces, Resources Conservation and Recycling, RECYCL, 1828, pp.1-18.
13 James Bennett, Rick Krabbe, Kyei-Sing Kwong, 2009 : Thermodynamic Studies of MgO Saturated Eaf Slag MOLTEN Proceeding CHAPTER 01, Santiago, Chile, pp.299-308.
14 Alena Pribulova, Peter Futas, Jozef Petrik, et al., 2018 : Comparison of cupola furnace and blast furnace slags with respect to possibilities of their utilization, Arch. Metall. Mater., 63(4), pp.1865-1873