The smelting separation process of rare earths in China is complicated. However, most rare earth enterprises still depend on laboratory off-line analysis to guide the process, leading to serious lagging of analytical results. Therefore, it is necessary to develop a high-efficiency and stable on-line analysis method for rare earths. In this paper, a kind of on-line determination method of holmium, erbium, thulium and ytterbium content in rare earth smelting separation process was established using rare earth distribution pattern on-line analyzer. The sampling tube was located in aqueous phase compartment of cascade-stage extraction tank. The sample was transported to the analysis area by peristaltic pump for X-ray fluorescence spectrometry (XRF) analysis and data record. The XRF testing conditions were optimized: the voltage was 40 kV, the current was 600 μA, and the testing time was 60 s. The in-site conditions were simulated and the optimal peristaltic pump speed was 250 r/min. The absorption enhancement effect among elements was eliminated by fundamental parameter method. The relative standard deviation (RSD, n=11) was less than 0.4%. The laboratory simulation and in-site on-line measurement results were in good agreement with the off-line analytical results by inductively coupled plasma atomic emission spectrometry (ICP-AES). The lagging time of measurement results was short, which could meet the determination requirements of dynamic control in rare earth smelting separation process.
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