1. Shandong Institute of Geological Sciences, Jinan 250013, China; 2. Key Laboratory of Geological Processes forMineralization of Metal Minerals and Resource Utilization in Shandong Province, Jinan 250013, China
Abstract：Diopside is a kind of novel mineral resource for ceramic industry. The major components including CaO, MgO and SiO2 are usually determined by chemical analysis methods such as titration and gravimetry. These methods have some shortcomings, for example, complicated operation procedures, large consumption of chemical reagents, long analytical period, etc. The sample was prepared with fusion method. Then the contents of major components in diopside including CaO, MgO and SiO2 were determined by X-ray fluorescence spectrometry (XRF). The national certified reference materials of wollastonite, talcum, ultra-basic rock and quartzite with similar chemical composition to diopside were selected and mixed to prepare calibration sample series with matched concentration and gradient to tested samples. The dilution ratio between sample and lithium tetraborate-lithium metaborate-lithium fluoride mixed flux (m∶m∶m=4.5∶1∶0.4) was 1∶20. LiBr solution and saturated LiNO3 solution was selected as releasing agent and oxidizing agent, respectively. The fused plate was prepared by fusion at 1050℃ for 9min. The correlation coefficient of calibration curve for each component was higher than 0.999. The detection limit of method was 35μg/g (CaO), 320μg/g (MgO) and 130μg/g (SiO2), respectively. The precision test was conducted with one diopside sample. The relative standard deviations (RSD, n=12) of determination results were between 0.19% and 0.45%. The proposed method was applied for the determination of various actual samples of diopside, and the results were basically consistent with those obtained by chemical analysis methods in other laboratories.
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