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Real time and high-precision online determination of main components in iron ore using spectral refinement algorithm
Optics Express
|November 29, 2023
Summary
A new laser-induced breakdown spectroscopy (LIBS) system offers real-time industrial analysis. This optimized LIBS setup significantly improves accuracy for determining key components like total iron.
Area of Science:
- Analytical Chemistry
- Materials Science
- Spectroscopy
Background:
- Real-time quantitative analysis instruments are crucial for industrial applications.
- Traditional methods often involve low-frequency sampling, limiting immediate process control.
- There is a need for high-precision, online analytical systems in various industrial fields.
Purpose of the Study:
- To design and implement a novel laser-induced breakdown spectroscopy (LIBS) setup for real-time online quantitative analysis.
- To optimize the optical route and spectral analysis algorithms for enhanced accuracy.
- To validate the system's performance in a real industrial setting for key component determination.
Main Methods:
- A new LIBS setup featuring a Maksutov-Cassegrain telescope with custom aspherical mirrors was developed.
- Optimized spectral pretreatment algorithms, including overlapped window slide (OWS) for baseline removal and dual normalization, were employed.
- Calibration and validation were performed using emissions insensitive to detection distance variations.
- The system automatically adjusted focal length between 780 mm and 940 mm.
Main Results:
- The online LIBS system successfully quantified total iron (TFe), silica (SiO2), aluminum oxide (Al2O3), and phosphorus (P).
- Significant improvements in accuracy were observed for TFe determination, with root mean square error of prediction (RMSEP) decreasing from 5.091% to 1.2328% and mean absolute error (MAE) from 4.801% to 0.9126%.
- Online measurements showed excellent agreement with official standard results.
Conclusions:
- The developed high-precision online LIBS system provides a significant upgrade from traditional low-frequency sampling methods.
- This technology enables high-frequency, real-time online determination, enhancing industrial process monitoring and control.
- The optimized optical design and advanced algorithms contribute to the system's robust performance and accuracy.
