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http://dx.doi.org/10.5345/JKIBC.2018.18.4.321

Quantitative Evaluation of Free CaO in Electric Arc Furnace Reduction Slag using the Ethylene Glycol Method  

Kwon, Seung-Jun (Department of Civil and Environment Engineering, Hannam University)
Lim, Hee-Seob (Department of Civil and Environment Engineering, Hannam University)
Lee, Han-Seung (Department of Architectural Engineering, Hanyang University)
Publication Information
Journal of the Korea Institute of Building Construction / v.18, no.4, 2018 , pp. 321-327 More about this Journal
Abstract
Blast furnace slag has been actively used as a substitute for cement in the construction field with high value-added through resource recycling research. However, most of the slag cannot find a clear recycling purpose. This is because some slags contain unstable materials and are used for road-use asphalt and embankment, which are low value-added materials. Electric arc furnace reduction slag(ERS) has been reported to contain a large amount of unstable free CaO due to deoxidation and component adjustment. In this study, free CaO of ERS which is generated in Korean steelmakers is quantitatively evaluated by using ethylene glycol method. As a result of free CaO quantitative evaluation of ERS, it was confirmed that there is a big difference according to the location of each field. In addition, ERS generally existed in powder form as undifferentiated characteristics, but it was confirmed that free CaO content was different due to hydration product in aggregate form due to water treatment. In addition, free CaO is an amorphous material and its crystallization characteristics are different due to the influence of temperature when it is cooled. ERS requires a long-term aging period as it contains a lot of free CaO.
Keywords
electric arc furnace reduction slag; free CaO; ethylene glycol method; amorphous material; crystallization;
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