Abstract：High-carbon-chromium-nickel pig iron was the early-stage product in stainless steel smelting. The content of carbon, silicon, chromium, and nickel in such steel was high. The spectral line interference among these high content elements had a great impact on the accuracy of sample analysis. Improving the analysis accuracy of main elements in such steel was the key to reduce the cost of stainless-steel smelting. Through the combination optimization of milling machine parameters, the optimal parameters for sample surface preparation were obtained in experiments. By optimizing the analysis conditions of X-ray fluorescence spectrometry, the following analytical conditions were determined: the voltage and current was 40 kV and 70 mA, respectively; Si, Cr and Ni adopted monochromators, while C, Mn, P and S adopted goniometers of Kα1,2; the crystal of AX16C was used for C, the crystal of InSb was used for Si, the crystal of Ge111 was used for P and S, and the crystal of LiF200 was used for Mn, Cr and Ni; meanwhile, the collimator of 2.60° was used for C, and the collimator of 0.25° was used for the other elements; the analytical time was 4-6 s. During the preparation of analytical curves for seven elements including C, Si, Mn, P, S, Cr and Ni, Multiplicative Concentration was used for C and Ni, Additive Intensity was used for Si, Additive Concentration was used for S, and Multiplicative Intensity was used for Mn, P and Cr. The correlation coefficients of curves were between 0.996 7 and 0.999 9. The long-term and short-term precision of the experimental method was verified. The relative standard deviations (RSD, n=11) of analytical results were between 0.019% and 2.0%. The accuracy test showed that the analysis results of sample were in good agreement with the reference values. In daily analysis, when the finger contacted the analytical surface, or when the analytical surface was polluted, it was cleaned with ethanol. The results showed that the sample surface could be treated with ethanol only when the carbon analysis results were not concerned. The proposed method was applicable for the analysis of high-carbon-chromium-nickel pig iron. It could improve the accuracy and reduce the cost of stainless steel smelting.
芦飞. X射线荧光光谱法分析高碳铬镍生铁中7种元素[J]. 冶金分析, 2021, 41(9): 63-69.
LU Fei. Analysis of seven elements in high-carbon-chromium-nickel pig iron by X-ray fluorescence spectrometry. , 2021, 41(9): 63-69.
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