On-line monitoring of elemental composition in molten aluminum bylaser-induced breakdown spectroscopy online analyzer forliquid metal composition
XIN Yong1,2,3,4, LI Yang1,2,3, CAI Zhen-rong5, YANG Ming5, YANG Zhi-jia1,2,3, SUN Lan-xiang*1,2,3
1.Laboratory of Industrial Control Network and System, Shenyang Institute of Automation, Chinese Academy ofSciences, Shenyang 110016, China; 2.Institutes for Robotics and Intelligent Manufacturing, Chinese Academy ofSciences, Shenyang 110016, China; 3.CAS Key Laboratory of Networked Control Systems, Shenyang 110016,China; 4.University of Chinese Academy of Sciences, Beijing 100049, China; 5.Dalian Yaming Automobile PartsCo., Ltd., Dalian 116041, China
Abstract：At present, the composition detection of products in metallurgy and die casting industry usually adopts off-line laboratory analysis, which cannot real-timely guide the production process. The self-developed liquid metal composition on-line analyzer based on laser-induced breakdown spectroscopy (LIBS) can be used for the on-line monitoring of elemental composition in molten metal in the fields of metallurgical industry. The real-time guidance of production process plays an important role to improve the product quality and reduce energy consumption. Firstly, the solid aluminum alloy standard sample of LF6 series were used to test LIBS on-line analyzer for liquid metal composition in laboratory. All performance indexes of instrument were verified. Then, the samples in die casting plants (the contents of Si, Fe, Cu, Mn, Ti and Mg had been calibrated by spark discharge atomic emission spectrometer in spectrographic laboratory) were used to calibrate the LIBS on-line analyzer for liquid metal composition. Finally, ten aluminum ladles containing molten aluminum were randomly selected in the field for on-line analysis by LIBS. Meanwhile, the samples were also off-line analyzed in spectrographic laboratory for comparison. The results showed that the relative standard deviations (RSD) of on-line analysis results were mostly about 2% for Si, Fe, Cu, Mn and Ti. The fluctuation of RSD values for Mg was relatively large, i.e., about 10%. The absolute values of relative deviations were basically less than 2% for Si, less than 5% for Fe, Cu, Mn and Ti, and more than 20% for Mg. Therefore, except for Mg, the measurement precision and accuracy of LIBS on-line analyzer for liquid metal composition could meet the field requirements in industry. The chemical composition of molten aluminum could be on-line monitored, which improved the production efficiency and also reduced the energy consumption. However, the determination precision and accuracy were relatively low for Mg, which should be further studied and improved.
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