Abstract:The carbon and sulfur elements in copper-lead-zinc polymetallic ores have important impacts on mineral exploitation, iron and steel smelting and environmental protection, which is crucial for accurate and rapid quantitative detection of carbon and sulfur. However, there is no research on the simultaneous determination of carbon and sulfur in copper-lead-zinc polymetallic ores. In this paper, the contents of carbon and sulfur in copper-lead-zinc polymetallic ores were scientifically divided into C1, C2, S1 and S2, and factors such as sample weight, flux addition ratio and type were investigated respectively. A method for the determination of carbon and sulfur in copper-lead-zinc polymetallic ores by high-frequency combustion infrared absorption method was established, and the accuracy, precision and reproducibility of the method were verified by reference materials. The results showed that the sample weights were 0.200 0 g, 0.100 0 g, 0.100 0 g, 0.100 0 g, the fluxs were Fe+W=0.600 0 g+0.600 0 g, 0.600 0 g +0.600 0 g , 0.900 0 g+0.600 0 g, 0.600 0 g+ 0.600 0 g were the best experimental conditions. The correlation coefficients of C1, C2, S1 and S2 curves were 0.999 4, 0.995 9, 0.999 9 and 0.998 9, respectively. The relative standard deviations(RSD, n=11) were 1.33%, 1.48%, 1.26% and 1.30%, and reproducibility relative standard deviations(RSD,n=7) were 1.04%, 0.82%, 0.64% and 0.34%, respectively. Three different types of infrared carbon and sulfur instruments were used for comparative tests. The relative standard deviations(RSD, n=11) were 0.56%-6.46%, and the reproducibility relative standard deviations(RSD, n=7) were 0.31%-2.07%. The results show that the method is accurate and reliable, and can meet the requirements of simultaneous, accurate and rapid quantitative detection of carbon and sulfur in copper, lead and zinc polymetallic ores.