1. Hebei Research Center for Geoanalysis, Baoding 071051,China; 2. Key Laboratory of Mineral Resources and Ecological Environment Monitoring Hebei Province,Baoding 071051, China
Abstract：Graphite is a special nonmetal material, and it has been widely used in aerospace industries and many other fields. The impurity elements in graphite (except carbon) have great influence on the properties of graphite products. Therefore, it is necessary to accurately determine the contents of impurity elements. The content of fixed carbon in graphite sample is high, which will easily black slag and bubbles in the case of direct melting. The sample is usually treated by preoxidation before fusion sample preparation. In this study, fusion sample preparation was conducted under the following conditions: the Li2B4O7-LiBO2 (mass ratio 1∶1) was selected as the mixed flux; the dilution ratio was 20∶1; four drops of 300 g/L LiBr was selected as the release agent; the sample was firstly preoxidized at 800 ℃ for 30 min, and then fused at 1 050 ℃ for 19 min. The calibration sample series with proper gradient range were prepared using the certified reference materials of graphite ore, stream sediment, rock and soil. The contents of 10 major and minor components in graphite ores, including Al2O3, SiO2, Fe2O3, MgO, CaO, K2O, Na2O, TiO2, MnO and P, were determined by X-ray fluorescence spectrometry (XRF). Ten major and minor components in certified reference materials of graphite ore (GBW03118 and GBW03120) were determined according to the experimental method. The relative standard deviations (RSD) of the determination results were between 0.20% and 3.7%. The measured results were consistent with the certified values. The graphite ore sample was also determined according to the experimental method and industrial standard method JC/T 1021.5-2007, and the results were consistent.
赵烨, 胡艳巧, 陈超, 张雪梅, 徐崇颖, 赵良成. 熔融制样-X射线荧光光谱法测定石墨矿中10种主次量组分[J]. 冶金分析, 2023, 43(8): 55-62.
ZHAO Ye, HU Yanqiao, CHEN Chao, ZHANG Xuemei, XU Chongying, ZHAO Liangcheng. Determination of 10 major and minor components in graphite ore by X-ray fluorescence spectrometry with fusion sample preparation. , 2023, 43(8): 55-62.
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