Determination of vanadium,silicon,phosphorus,manganese, aluminum,iron,chromium,nickel and copper in ferrovanadium by X-ray fluorescence spectrometry with fusion sample preparation
YU Lihui, ZHENG Xiaomin, ZHANG Tingting, LI Jichun
1. Pangang Group Research Institute Co., Ltd.,Panzhihua 617000, China; 2. Sichuan Pan Testing Technology Co., Ltd.,Panzhihua 617000, China
Abstract:Ferrovanadium is mainly used as additive for the alloy steel. Its chemical composition is usually analyzed by titration method, spectrophotometry or atomic absorption spectrometry. However, these methods are relatively cumbersome with long process. The glass bead in experiments was prepared by two-step fusion method. In other words, the sample was firstly mixed with Li2B4O7, Li2CO3 and nitrate, and then fused in porcelain crucible with graphite powder on the bottom. The molten ball of sample was transferred to the platinum-gold crucible for refusion. Accordingly, the determination method of vanadium, silicon, phosphorus, manganese, aluminum, iron, chromium, nickel and copper in ferrovanadium by X-ray fluorescence spectrometry (XRF) was established. The results showed that the sample fusion effect was best under the following experimental conditions: the mass ratio of Li2B4O7, Li2CO3 and sample was 7∶2∶0.2; the dosage of NH4I for release agent was 0.5-1 g; the fusion was conducted at 1 050 ℃ for 15-20 min. The matrix effect was corrected by the theoretical coefficient method. The correlation coefficients of calibration curves of elements were all greater than 0.996. The precision tests showed that the relative standard deviations (RSD, n=11) of determination results of elements in ferrovanadium were all less than 4%. The proposed method was applied for the analysis of actual sample, and the results were consistent with those obtained by other methods.
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