Abstract：At present, the composition detection of copper concentrate usually adopts off-line sampling and testing in laboratory. However, there are some problems such as poor sampling representativeness, long detection time and lagged determination results. Focusing on these problems, the on-line detection of key elements in copper concentrate including Cu, S, Fe and Si using laser composition analyzer based on laser-induced breakdown spectroscopy(LIBS) was investigated. Meanwhile, the off-line detection of same samples by X-ray fluorescence spectrometer (XRF) was also conducted for comparison.The results showed that compared to the off-line detection results by XRF, the mean absolute error of Cu, S, Fe and Si by on-line detection using laser composition analyzer was 0.50%, 0.56%, 0.65% and 1.67%, respectively. The average relative error was 2.80%, 2.28%, 2.74% and 12.89%, respectively. For the repeatability of on-line detection results of elements, the maximum difference and relative standard deviation (RSD) were both consistent with the analysis results by national standard method (chemical wet method). The on-line detection had good stability and repeatability. The on-line composition analyzer based on LIBS technology could meet the requirements of real-time performance and reliability for composition detection of copper concentrate in copper smelting process. It could provide effective support to improve the burdening quality and optimize the smelting process.
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