微波消解-电感耦合等离子体原子发射光谱法测定铁矿石中硅和磷

硅和磷是铁矿石品质的关键指标,准确、快速地测定硅和磷含量,有利于确定铁矿石的经济价值和制定冶炼工艺.实验采用盐酸-硝酸-氢氟酸混酸体系并使用微波消解法消解试样,然后采用电感耦合等离子体原子发射光谱法(ICP-AES)测定硅和磷.试验了不同消解体系的消解效果,结果表明盐酸-硝酸-氢氟酸消解体系消解效果最佳,以5％混酸作为...

Determination of silicon and phosphorus in iron ore by microwave digestion-inductively coupled plasma atomic emission spectrometry

Silicon and phosphorus are the key indexes for the quality of iron ore. Accurate and rapid determination of silicon and phosphorus content is of great significance to determine the economic value of iron ore and establish the smelting process. The iron ore samples were decomposed and dissolved in hydrochloric acid-nitric acid-hydrofluoric acid mixed system by microwave digestion. Then the contents of silicon and phosphorus were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The digestion effects in different systems were tested, and the results showed that the digestion system of hydrochloric acid-nitric acid-hydrofluoric acid mixture had best digestion efficiency. The calibration curve was prepared by matrix matching method in 5% mixed acid as testing medium to eliminate the influence of matrix effect. The linear correlation coefficients of calibration curves for silicon and phosphorus were both higher than 0.999 9. The limit of detection (LOD) was 0.076% and 0.000 94% for silicon and phosphorus, respectively. The contents of silicon and phosphorus in certified reference materials of iron ore such as GSB03-2854-2012 were determined according to the experimental method. The relative standard deviations (RSD, n=6) of determination results were between 0.15% and 1.9%. The found results had no significant difference with the certified values. The iron ore sample NIL PT-1798-2 for proficiency testing was determined according to the experimental method, and the results were satisfactory.