Valorization of Electrical Arc Furnace Oxidizing Slag
Valorization of the electrical arc furnace oxidizing slag by coke was carried out by the reduction of iron oxide in the slag. Since the reduction of iron oxide by solid carbon is an endothermic reaction, supply of heat energy is required. In addition, slag has a low thermal conductivity; traditional fuel injection is not suitable for this reaction. Microwave can be used to supply heat energy to the system. Commercial oxidizing slag was reduced by coke under the microwave irradiation (1.7 kW, 2.45 GHz). The maximum recovery ratio of iron was 87%. In addition, slag composition modification was attempted to use the remaining slag for a mixture in cement clinker. Free-CaO in the slag was successfully suppressed, and the use of the remaining slag as a potential mixture was confirmed.
KeywordsElectrical arc furnace Oxidizing slag Recovery of iron
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- 1.J. Lee et al., “Valorization of steelmaking slag”, Euromat, Montpellier, France, 2011.Google Scholar
- 2.I. Sohn et al., “Development of an ECO slag processing technology for iron recovery and value-added products in steelmaking”, The 7th Euroslag conference, Ijmuiden, The Netherlands, 2013.Google Scholar
- 3.E.T. Turkdogan, Physical Chemistry of High Temperature Technology, (New York: Academic Press, 1980)7, 11.Google Scholar
- 7.K. Morita et al., “Immobilization of ash by microwave heating”, Proceeding of the 11th Incineration Conference, Albuquerque, Univ. California Irvine, Irvine, 1992, 507–514.Google Scholar
- 8.K. Morita et al., “Resurrection of the iron and phosphorus resource in steel-making slag”, J. Mater. Cycles Waste Manag, 4 (2002), 93–101.Google Scholar
- 10.X. Sun et al., “Petroleum coke particle size effects on the treatment of EAF dust through microwave heating”, J. Min. Mater. Charact. Eng., 8(4) (2009) 249–259.Google Scholar
- 14.S.B. An et al., “Reduction of electrical arc furnace oxidizing slag by coke under microwave irradiation”, Met. Mater. Int., 2014, in press.Google Scholar
- 16.J. Lee and T. Kim, “Application of microwave heating to recover metallic elements from industrial waste,” Advances in induction and microwave heating of mineral and organic materials, Intech, Rijeka, Croatia, 2011, 303–312.Google Scholar