Abstract：In the process of blast furnace smelting, the condition of the furnace and the quality of molten iron produced can be directly fed back by measuring the chemical composition of the nickel sinter. Due to the lack of matching reference materials and appropriate X-ray fluorescence spectrometry (XRF), the traditional wet method is still used in the industry for the determination of the chemical components of the nickel sinter. The operation is complicated and the measurement period is long. In experiments, the contents of 10 components in nickel sinter (including Ni, TFe, Cr, Mn, SiO2, CaO, MgO, Al2O3, P and TiO2) were determined by XRF with fusion sample preparation. The effects of flux, dilution ratio, release agent, fusion temperature and fusion time on the sample fusion and determination results were discussed. The results showed that the glassy sample was uniform, transparent and free of impurities when prepared under the following conditions: the flux was anhydrous lithium tetraborate-lithium carbonate (mass ratio of 6∶1), the dilution ratio between flux and sample was 20∶1, the release agent was 160 mg of ammonium iodide, the fusion temperature was 1 050 ℃, and the fusion time was 15 min. The certified reference materials of common sinter ore was used as the main body, and the nickel standard solution and high purity chromium trioxide were added in a certain proportion to prepare 11 calibration samples with different content gradients for establishing the calibration curve. The interference of matrix effect could be effectively avoided. The correlation coefficients of calibration curves of various components were in range of 0.999 6-1.000 0. The proposed method was applied to the determination of components in nickel sinter, and the relative standard deviations (RSD, n=10) of the measurement results were between 0.07% and 3.2%. The certified reference materials and actual production samples of the nickel sinter were determined, and the found results were basically consistent with the certified values and those obtained by the traditional wet method. The use of proposed method for the determination of nickel sinter had a good promoting effect on the upgrading of blast furnace smelting process.
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