Abstract：Polymetallic ore has important research and mining value. The determination of silicon dioxide content is of great significance for the comprehensive analysis of chemical composition and mineral composition of polymetallic ore. The existing measurement methods cannot meet the requirements of rapid and accurate analysis of silicon dioxide in polymetallic ore. In experiments, 0.100 0 g of sample was weighed and transferred into a silver crucible. After adding 1.0 g of sodium hydroxide, and mixture was fused in muffle furnace where the temperature was gradually increased from room temperature to 640 ℃. The melt was extracted with water in a plastic beaker. The leaching solution was poured into hot hydrochloric acid solution (1+1), and constantly stirred. Then the solution was heated to boiling. After cooling, the solution was diluted to 250 mL in a volumetric flask, and the acidity of final solution was controlled at 5% hydrochloric acid. Si 251.611 nm was selected as the analytical line. Thereafter a method for the determination of silicon dioxide content in polymetallic ore by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The results showed that the mass concentration of silicon dioxide had a linear relationship with the corresponding emission intensity in the range of 1.00-50.00 μg/mL, and the linear correlation coefficient was 0.999 8. The limit of detection was 0.01% (mass fraction, similarly hereinafter). The limit of quantification was 0.04%. The content of silicon dioxide in polymetallic ore sample was determined according to the experimental method, and the relative standard deviation (RSD, n=6) of the determination results was less than 3%. The proposed method was applied for the determination of silicon dioxide in certified reference materials of polymetallic ore. The absolute value of relative error was less than 3.1%. The found results were consistent with the recommended values.
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