In-situ measurement and quantitative analysis of molten aluminum liquid ingredient by laser-induced breakdown spectroscopy under magnetic field condition
LU Hui1,2, HU Xiao-jun*1, CAO Bin2, SUN Lan-xiang3, CONG Zhi-bo3, DONG Wei3
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. National Engineering and Technology Research Center of Aluminum and Magnesium Electrolysis Equipment, Guiyang 550081, China; 3. Shen Yang Institute of Automation Chinese Academy Sciences, Shenyang 110016, China)
Abstract：The aluminum electrolysis workshop has the environmental characteristics of high temperature, strong magnetism and heavy dust. In the current production process, the composition of molten raw aluminum is usually analyzed offline after manual sampling. The detection process and results are greatly lagging. Therefore, the application of laser induced breakdown spectrum (LIBS) technology for the in-situ and real-time measurement of aluminum liquid composition in electrolysis workshop has important significance. The laser-induced breakdown spectroscopy system composed of Nd: YAG pulsed laser, multichannel fiber optic spectrometer and charge coupled device (CCD) detector was used. The main composition including iron and silicon in molten aluminum liquid in 400kA electrolytic cell was detected. The attribution analysis of characteristic lines for some elements in molten aluminum liquid was carried out. The attenuation and gradient evolution laws of laser energy in the magnetic field were investigated. The results showed that the maximum attenuation of laser energy was at the position with distance of 2m to the edge of electrolytic cell. The effect of magnetic field on the test system was analyzed. The calibration curve was also established. The fitness of calibration curves for Fe and Si based on the internal standard method was 93.50% and 97.10%, respectively. The proposed model was used for testing experiments. The repeatability and admissible error of measurement results were verified using the related indexes in optical emission spectrometry (OES) in GB/T 7999-2015. The results showed that LIBS technology had good application prospects in online detection in electrolytic aluminum industry. However, the stability and repeatability in measurement were also important problems.
路辉, 胡晓军, 曹斌, 孙兰香, 丛智博, 董伟. 磁场环境下铝电解熔融铝液成分激光诱导击穿光谱原位测量分析[J]. 冶金分析, 2019, 39(2): 8-16.
LU Hui, HU Xiao-jun, CAO Bin, SUN Lan-xiang, CONG Zhi-bo, DONG Wei. In-situ measurement and quantitative analysis of molten aluminum liquid ingredient by laser-induced breakdown spectroscopy under magnetic field condition. , 2019, 39(2): 8-16.
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