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Scanning Electron Microscopy-Cathodoluminescence Imaging of Industrial Steelmaking Slag for Identifying and Determining the Free Magnesia Content

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Abstract

The reuse of steelmaking slag is a crucial step to protect the environment. However, steelmaking slag can cause road cracking when reused for road construction owing to the volumetric expansion of its free magnesia (f-MgO) content related to the hydration reaction. A method for rapidly determining the f-MgO content is not well established. The authors present a method for rapidly identifying and determining the f-MgO content of industrial steelmaking slag using a scanning microscopy-cathodoluminescence (SEM-CL) instrument. The colors of CL images and contrast of backscattered electron (BSE) images can be used to distinguish f-MgO from other minerals in the slag, such as MgO·Al2O3 spinel, merwinite, pseudowollastonite, and melilite by observing areas with dark gray in the BSE image contrast and no luminescence color in CL images at 420 to 680 nm wavelength. The f-MgO content can then be determined according to the areas of f-MgO identified in the BSE and CL images. In experiments, the BSE and CL images were acquired within 10 seconds. Thus, the proposed method can be used to rapidly determine the f-MgO content in industrial steelmaking slag.

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Acknowledgments

Financial support for the present study was provided by JSPS KAKENHI Grant Number 22H01837. The authors would like to thank Nippon Steel Corp. for the supplies of steelmaking slag samples.

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  1. Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba-ku, Sendai, 980–8577, Japan

    Susumu Imashuku & Kazuaki Wagatsuma

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  1. Susumu Imashuku
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  2. Kazuaki Wagatsuma
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Correspondence to Susumu Imashuku.

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Imashuku, S., Wagatsuma, K. Scanning Electron Microscopy-Cathodoluminescence Imaging of Industrial Steelmaking Slag for Identifying and Determining the Free Magnesia Content. Metall Mater Trans B 53, 3459–3468 (2022). https://doi.org/10.1007/s11663-022-02609-z

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