Abstract：The grade of lead-zinc ore in the flotation process is related to the overall production efficiency of flotation plants. The chemical titration is the generally used method for the measurement of lead-zinc ore grade, but this process is complicated and time-consuming.The X-ray fluorescence spectrometry (XRF) technique was used to measure the slurry grade of raw ore, zinc concentrate and lead concentrate in the laboratory. The influence of slurry concentration on the measuring results was investigated. The results showed that the mass concentration of lead-zinc ore slurry was the main influencing factor in XRF measurement. On this basis, the scattering intensity of Mo in X-ray tube was used as the correcting factor to establish the correction proportional model for the grade of lead-zinc ore slurry. The correction model was used for the verification of another group of lead-zinc ore slurry. The experimental and correction results indicated that the XRF detection system could rapidly measure the grade of lead-zinc ore slurry. The average relative error of measurement results was less than 3%.
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