Determination of vanadium,silicon,calcium,magnesium,aluminum, manganese,chromium,titanium and phosphorus in vanadium slag by inductively coupled plasma atomic emission spectrometry after alkali fusion
CHENG Yong, LIU Liwei, YUAN Jinhong, HE Qiping, WEI Fang
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Research Institute Co.,Ltd., Panzhihua 617000, China
Abstract：Vanadium slag is the key raw material to prepare high-vanadium products such as vanadium oxides and vanadium metal materials. The rapid and accurate determination of composition contents is the precondition for the adjustment and control process parameters to ensure the product quality. The detection efficiency of chemical wet method is low and the testing period is long. X-ray fluorescence spectrometry(XRF) is difficult to meet the determination requirements of micro elements. Therefore, the analysis method for the simultaneous determination of V, Si, Ca, Mg, Al, Mn, Cr, Ti and P in vanadium slag by inductively coupled plasma atomic emission spectrometry (ICP-AES) after alkali fusion was established. The conditions for sample fusion, such as mixture ratio and dosage of flux, reaction temperature and time, were studied. The following sample decomposition method was finally selected: 0.10 g of vanadium slag sample was fused with 0.80 g of potassium carbonate-boric acid mixed flux (mass ratio of 1∶1) at 950 ℃ for 25 min. Through spectral interference experiments, the suitable analytical lines for each analyte with appropriate sensitivity yet without suffering from spectral interference were selected: V 289.332 nm, Si 251.611 nm, Ca 317.933 nm, Mg 285.213 nm, Al 396.152 nm, Mn 293.306 nm, Cr 267.716 nm, Ti 323.904 nm and P 178.284 nm. These analytical lines could meet the requirements for the simultaneous determination of major and micro elements in vanadium slag. Spectral interference from continuous background overlapping and matrix effect in coexistent system of vanadium slag and alkali metal fluxes was investigated. The influence was eliminated by matrix matching and synchronous background correction. Moreover, the working conditions such as analytical line integral area and background correction area were optimized to improve the testing performance of method. The results showed that the determination ranges were: 0.10%-20.0% V; 0.10%-15.0% Si; 0.10%-10.0% Ca, Mg, Al, Mn and Ti; 0.10%-5.0% Cr; 0.01%-1.0% P. The linear correlation coefficients of the calibration curves were not less than 0.999 6. The limits of detection were between 0.000 6% and 0.002 7%. The content of each components in vanadium slag were determined according to the experimental method. The relative standard deviations (RSD, n=8) of component with content higher than 0.1% was less than 1.0%, and the RSDs (n=8) of components with content less than 0.1% was less than 3.0%. The determination results of certified reference material of vanadium slag were in good agreement with the certified values.
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