Browse > Article
http://dx.doi.org/10.7844/kirr.2021.30.6.53

Basic Study on the Recycling of a Waste MgO-C Refractory Material as a Flux for EAF Steelmaking  

Wang, Jei-Pil (Department of Metallurgical Engineering, Department of Marine Convergence Design Engineering (Advanced Materials Engineering), Pukyong National University)
Kim, Hang-Goo (Major of Energy & Resources Engineering, Korea Maritime&Ocean University)
Go, Min-Seok (Department of Marine Convergence Design Engineering(Advanced Materials Engineering), Pukyong National University)
Lee, Dong-Hun (Department of Marine Convergence Design Engineering(Advanced Materials Engineering), Pukyong National University)
Publication Information
Resources Recycling / v.30, no.6, 2021 , pp. 53-60 More about this Journal
Abstract
In EAF steelmaking industries, MgO content in slag increases due to the addition of dolomite flux to protect refractory lines of furnaces and improve the desulfurization capability of slag. In addition, coal powder is injected in the molten steel bath to increase the energy efficiency of the process. In this regard, the utilization of waste MgO-C refractory material as a flux was examined because it has high amounts of MgO (>70%) and graphite carbon (>10%). A series of experiments were carried out using industrial EAF slag with added light burnt dolomite and waste MgO refractory material from a Korean steel company. The results for the addition of the two fluxes were similar in terms of slag basicity; therefore, it is expected that waste MgO-C refractory material can successfully replace dolomite flux. In addition, when the waste MgO-C refractory material was added as flux, slag foaming phenomenon was demonstrated because of the reaction between the graphite from the refractory material and iron oxides in the slag.
Keywords
Light burnt dolomite; Steel making; Slag; MgO; Refractory materials;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Marcus Kirschen, 2020 : Visualization of Slag Data for Efficient Monitoring and Improvement of Steelmaking Slag Operation in Electric Arc Furnaces, with a Focus on MgO Saturation, Metals - Open Access Metallurgy Journal, 11(1), pp.17.
2 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.
3 POSCO Chem-Tech, 2011. KR. KR20110124661A.
4 K. S. Kwong., J. P. Bennett., 2000 : Balancing MgO for Foamy Slag and Refractory Protection, D.L. Schroeder & Associates, Twenty Second Annual Symposium, Process Systems for Electric Furnace Steelmaking, Orlando, Florida, 9-10 November 2000.
5 Young Hwan Kim, Jung-Min Yoo, Hyung-Sic Um, 2019 : Effect of Carbon Materials on the Slag Foaming in EAF Process, Journal of the Korean Institute of Resources Recycling, 28(2), pp.40-45.   DOI
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 Marcus Kirschen, In-Ho Jung and Gernot Hackl, 2020 : Phase Equilibrium Diagram for Electric Arc Furnace Slag Optimization in High Alloyed Chromium Stainless Steel-making, Metals, 10(6), pp.826.   DOI
8 James Bennett, Kyei-Sing Kwong, 2010 : Thermodynamic Studies of MgO Saturated EAF Slag, Ironmaking & Steel-making, 37(7), pp.529-535.   DOI
9 A.N. Conejo, R.G. Lule, F. Lopez, et al., 2006 : Recycling MgO-C refractory in Electric Arc Furnaces, Resources Conservation and Recycling, 49(1), pp.14-31.   DOI
10 Rodolfo Montecinos Almeida, Deisi Vieira, W. V. Bielefeldt, et al., 2017 : MgO Saturation Analisys of CaO-SiO2-FeO-MgO-Al2O3 Slag System, Materials Research, 21(1).
11 Fruehan, R J., Li, Y., Brabie, L., 2003 : Dissolution of magnesite and dolomite in simulated EAF slags, ISSTECH-Conference Proceedings, pp.799-812, Iron & Steel Society International Technology Conference and Exposition, Indianapolis, IN., USA, 2003.
12 Liesbeth Horckmans, Peter Nielsen, Philippe Dierckx, et al., 2019 : Recycling of refractory bricks used in basic steel-making : A review, Resources, Conservation & Recycling, 140, pp.297-304.   DOI
13 Kun Mok Shon, Jang Su Kim, Si Wan Kim, et al., 2002 : Recycling of waste refractory materials for steel, Ceramist, 5(5), pp.35-42.
14 Mohammed Tayeb, Andre N. Assis, Seetharaman Sridhar, et al., 2015 : MgO Solubility in Steelmaking Slags, Metallurgical and Materials Transactions B 46(3), pp.1112-1114.   DOI
15 Ping Wang, Qing-min Meng, Hong-ming Long, et al., 2006 : Influence of Basicity and MgO on Fluidity and Desulfurization Ability of High Aluminum Slag, High Temp. Mater. Proc., 35(7), pp.669-675.   DOI
16 Deisi Vieiraa, Rodolfo Arnaldo Montecinos de Almeidaa, Wagner Viana Bielefeldta, et al., 2016 : Slag Evaluation to Reduce Energy Consumption and EAF Electrical Instability, Materials Research, 19(5), pp.1127-1131.   DOI
17 Kyei-Sing Kwong and James P. Bennett, 2002 : Recycling practices of spent MgO-C refractories, Journal of Minerals & Materials Characterization & Engineering, 1(2), pp.69-78.   DOI