Abstract：The ferronickel smelting process materials such as laterite-nickel ore calcine, dust and electric furnace slag were pretreated by oxidization for the fusion sample preparation. The calibration curves for the X-ray fluorescence spectrometry (XRF) analysis were prepared using the certified reference materials of iron ore and converter slag and the self-made standard sample of laterite-nickel ore. The rapid and accurate determination of ten components (Ni, Fe, SiO2, MgO, CaO, P2O5, Al2O3, Cr2O3, MnO and Co) in ferronickel smelting process materials was realized. It was found that the mass fraction of reducing components was relative low when the sample (200-mesh, 74 μm) was oxidized in air at 900 ℃ for 45 min. Under the tested oxidization conditions, the mass fraction of elementary metals and residual carbon in laterite-nickel ore calcine, dust and electric furnace slag samples could be reduced below 0.1%, which met the requirements of platinum-gold alloy crucible in fusion sample preparation. The fusion results were good when the mixed lithium metaborate and lithium tetraborate was used as the flux, the dilution ratio was 10, and the sample was fused at 1 050 ℃ for 15 min. The matrix effect was corrected by the theoretical α coefficient method. The linear correlation coefficients of calibration curves of components were all higher than 0.999. The laterite-nickel ore and its calcine, dust and electric furnace slag were analyzed by the proposed method. The results of precision test showed that the relative standard deviations (RSD, n=9) was less than 5%. The determination results were corrected according to the loss on ignition to calculate the contents of components in sample. The found results were consistent with those obtained by chemical method.
施善林,郭阳,李东麟,王永海. 熔融制样-X射线荧光光谱法测定镍铁冶炼过程物料中10种组分[J]. 冶金分析, 2015, 35(7): 54-59.
SHI Shan-lin,GUO Yang,LI Dong-lin,WANG Yong-hai. Determination of ten components in ferronickel smelting process materials by X-ray fluorescence spectrometry with fusion sample preparation. , 2015, 35(7): 54-59.
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