Determination of gold in electrostatic precipitator dust of sinter machine head by flame atomic absorption spectrometry after ethanol immersion-activated carbon enrichment
LUO Yong-hong,WEI Zhen-zhou,QIN Hui-ping,QIN Xue-feng,LIN Ling-yu,CHEN Man
Guangxi Research and Design Institute of Metallurgy Co.,Ltd.,Nanning 530023,China
Abstract：For electrostatic precipitator dust sample of sinter machine head, Au(Ⅲ) in the sample solution could be very easily adsorbed by high content carbon and sulfur substances, thus greatly influencing the determination of Au. If the carbon and sulfur was directly removed by roasting method, the sample was easily agglomerated due to the exist of high content of alkali metals. As a result, the carbon and sulfur substances could not only be fully removed, but also the sample dissolution became a problem. The sample was immersed in anhydrous ethanol followed by roasting to remove carbon and sulfur substances. Then the sample was treated with NaCl-NaF-KMnO4-aqua regia (1+1) system, and Au was enriched with activated carbon. Consequelty, a determination method of Au in electrostatic precipitator dust of sinter machine head by flame atomic absorption spectrometry (FAAS) was established. The results showed that the sample could be fully dissolved under the following conditions: 30 g of sample was immersed in 30 mL of anhydrous ethanol; after heating at low temperature for 10 min, the suspension was filtrated and the sample was dried; then the sample was roasted in muffle furnace at 700 ℃ for 1 h; after cooling, 10 g of NaCl, 0.5 g of NaF, 1 g of KMnO4 and 80 mL of aqua regia (1+1) were added; the solution was heated and slightly boiled for 30 min. The mass concentration of Au in range of 0.5-4.0 μg/mL had good linearity to its corresponding absorbance with correlation coefficient of 0.999 2. The detection limit of method was 0.12 μg/mL. The interference tests indicated that the interference of coexisting elements with the determination of Au could be ignored after enrichment and separation by activated carbon. The experimental method was applied to the determination of gold in electrostatic precipitator dust actual sample of sinter machine head. The results were consistent with those obtained by fire assaying-gravimetric method. The relative standard deviation (RSD, n=6) was less than 5.0%.
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