Characteristics of laser-induced breakdown spectroscopy of liquid slag

Changyan DONG; Hongxia YU; Lanxiang SUN; Yang LI; Xiuye LIU; Ping ZHOU; Shaowen HUANG

doi:10.1088/2058-6272/ad0c25

Plasma Science and Technology > 2024 > 26(2): 025502. > DOI: 10.1088/2058-6272/ad0c25

Changyan DONG, Hongxia YU, Lanxiang SUN, Yang LI, Xiuye LIU, Ping ZHOU, Shaowen HUANG. Characteristics of laser-induced breakdown spectroscopy of liquid slag[J]. Plasma Science and Technology, 2024, 26(2): 025502. DOI: 10.1088/2058-6272/ad0c25

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Characteristics of laser-induced breakdown spectroscopy of liquid slag

1.
State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
2.
Key Laboratory of Networked Control Systems, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
3.
Institutes for Robotics and Intelligent Manufacturing, Chinese Academy of Sciences, Shenyang 110169, People’s Republic of China
4.
Shenyang University of Technology, Shenyang 110870, People’s Republic of China
5.
Shenyang Ligong University, Shenyang 110142, People’s Republic of China
6.
Shandong Iron and Steel Company Ltd., Jinan 271105, People’s Republic of China

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Author Bio:
Lanxiang SUN: sunlanxiang@sia.cn
Corresponding author:
Lanxiang SUN, sunlanxiang@sia.cn
Received Date: May 30, 2023
Revised Date: August 25, 2023
Accepted Date: August 27, 2023
Available Online: January 08, 2024
Published Date: February 04, 2024

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Abstract

Abstract

Rapid online analysis of liquid slag is essential for optimizing the quality and energy efficiency of steel production. To investigate the key factors that affect the online measurement of refined slag using laser-induced breakdown spectroscopy (LIBS), this study examined the effects of slag composition and temperature on the intensity and stability of the LIBS spectra. The experimental temperature was controlled at three levels: 1350 °C, 1400 °C, and 1450 °C. The results showed that slag composition and temperature significantly affected the intensity and stability of the LIBS spectra. Increasing the Fe content and temperature in the slag reduces its viscosity, resulting in an enhanced intensity and stability of the LIBS spectra. Additionally, 42 refined slag samples were quantitatively analyzed for Fe, Si, Ca, Mg, Al, and Mn at 1350 °C, 1400 °C, and 1450 °C. The normalized full spectrum combined with partial least squares (PLS) quantification modeling was used, using the Ca II 317.91 nm spectral line as an internal standard. The results show that using the internal standard normalization method can significantly reduce the influence of spectral fluctuations. Meanwhile, a temperature of 1450 °C has been found to yield superior results compared to both 1350 °C and 1400 °C, and it is advantageous to conduct a quantitative analysis of the slag when it is in a “water-like” state with low viscosity.
- laser-induced breakdown spectroscopy (LIBS),
- slag,
- temperature,
- composition,
- viscosity,
- internal standard normalization,
- partial least squares (PLS)

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Characteristics of laser-induced breakdown spectroscopy of liquid slag