Abstract
Determining the free lime (f-CaO) content in steelmaking slag is critical for road construction because f-CaO is likely to cause road expansion. Herein, we present a method to determine an area fraction of f-CaO from fractions of illuminated areas related to f-CaO in cathodoluminescence (CL) or X-ray excited optical luminescence (XEOL) image of industrial steelmaking slag, which is simpler and quicker than the commonly employed ethylene glycol extraction method. A heat-treatment in which the industrial steelmaking slag was quenched from 1000 °C was needed to obtain intense luminescence from f-CaO, which originated from a peak at 600 nm. Other mineral phases, such as Ca2SiO4, free magnesia, and 2CaO·Al2O3·SiO2, were distinguishable from f-CaO from their luminescent colors. When we analyzed three types of industrial steelmaking slag with different f-CaO contents, the order of the fractions of the illuminated areas originating from f-CaO in the CL images was consistent with that of the f-CaO content measured applying the ethylene glycol extraction method. The average exposure times it took the CL and XEOL images to detect the luminescence from f-CaO were 5 and 30 seconds, respectively. In particular, acquiring XEOL images is promising for on-site analysis.
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Acknowledgments
This study was supported by Steel Foundation for Environmental Protection Technology. We would like to thank Nippon Steel Corp. and JFE Steel Corp for the supplies of steelmaking slag samples and for the determination of their f-CaO contents.
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Imashuku, S., Wagatsuma, K. Determination of Area Fraction of Free Lime in Steelmaking Slag Using Cathodoluminescence and X-ray Excited Optical Luminescence. Metall Mater Trans B 51, 2003–2011 (2020). https://doi.org/10.1007/s11663-020-01927-4
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DOI: https://doi.org/10.1007/s11663-020-01927-4