Application of laser-induced breakdown spectroscopy slurry grade analyzer in iron ore beneficiation
HU Jian1, GAI Junpeng1, QI Lifeng2, WANG Jinchi2, ZHENG Liming2, SUN Lanxiang*2,3
1. Guanbaoshan Mining Co.,Ltd.,Anshan 114044,China; 2. State Key Laboratory of Robotics,Shenyang Institute of Automation,Chinese Academy of Sciences,Shenyang 110016,China; 3. Liaoning Liaohe Laboratory,Shenyang 110169,China
Abstract：A slurry grade analyzer based on laser-induced breakdown spectroscopy technology was employed for the online measurement of slurry grade in the production process of iron ore beneficiation.The automatic sampling was conducted through a pipeline sampler,and the slurry sample was directly transported to the analyzer.Based on the characteristics of iron ore slurry in the production process of iron ore beneficiation,the parameters of analyzer system such as secondary fractional sampling volume,laser energy,and spot size were optimized.The optimal secondary fractional sampling volume was 10 L,the laser energy was 200 mJ,and the spot size was 1.0 mm.A model was established using the nonlinear partial least squares(PLS) method based on cyclic variable filtering,and then compared with synchronous sampling analysis at different stages.The results showed that the mean absolute error(MAE) and root mean square error(RMSE) were both less than 1% when the Fe grade in slurry was measured by the slurry grade analyzer,which could meet the requirements of production control.This technology had broken the bottleneck of precise online measurement of iron grade in slurry.It had effectively promoted the development of intelligent mining production and laid an important foundation for building an intelligent factory.
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