Abstract：Copper-lead-zinc ore was an important raw material for steel smelting, and its sulfur content would directly affect these properties such as of steel brittleness and fluidity. Therefore, the accurate and rapid determination of sulfur content in copper-lead-zinc ore was of great significance for the smelting of copper-lead-zinc ore. Several certified reference materials of copper-lead-zinc ores with similar chemical properties as the actual sample were selected to establish the calibration curve for eliminating the matrix effect. Thus, a determination of sulfur content with mass fraction in range of 0.106%-10.76% in copper-lead-zinc ore was realized by high frequency combustion infrared absorption method with iron and tungsten-tin as flux. The effect of determination conditions such as sample mass, the mass of tungsten-tin flux, comparator level, analysis time and crucible covered or not were discussed. The optimum analytical conditions were obtained as follows: the sample mass was 0.1000g; the mass of tungsten-tin flux was 1.6g; the comparator level was 1%; the analysis time was 50s; the crucible was not covered. The results showed that the linear correlation coefficient of calibration curve was 0.9999. The limit of detection was 0.0264%, and the limit of quantification was 0.106%. Different certified reference materials of copper-lead-zinc ore were determined according to the experimental method. The relative errors were all less than the allowance limit of relative error obtained in accordance with The specification of testing quality management for geological laboratories of DZ/T 0130-2006. The content of sulfur in actual sample of copper-lead-zinc ores was determined parallel for 11 times according to the experimental method. The results were compared with those obtained by combustion iodine method and barium sulfate gravimetry. The relative standard deviation (RSD, n=11) were between 0.50% and 4.6%.
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