Determination of six components in direct reduced iron by X-ray fluorescence spectrometry with pressed powder pellet
FU Yafeng1, ZHAO Chao1, LIU Shuanglong1, AI Lianfeng2
1. Caofeidian Business Department of Shijiazhuang Customs Technology Center, Tangshan 063205, China; 2. Shijiazhuang Customs Technology Center, Shijiazhuang 050011, China
Abstract：The impurity elements such as silicon, aluminum, phosphorus, magnesium, calcium, and sulfur in direct reduced iron have an important impact on the quality of steel. At present, these elements are usually determined by chemical wet analysis or X-ray fluorescence spectrometry(XRF) with fusion sample preparation. However, the measurement procedures of the method above are relatively complicated. To shorten the detection time, the method for the determination of SiO2, Al2O3, P, MgO, CaO and S in direct reduced iron by X-ray fluorescence spectrometry with pressed powder pellet was studied. The starch was selected as the binder in experiments. 0.350 0 g of starch was added into 7.000 0 g of sample. The mixture was ground for 120 s to reduce the particle size less than 0.074 mm. Then the pellets were prepared under pressure of 30 t. A series of direct reduced iron standard sample/calibration sample with certain content gradient, which had similar composition, structure, and particle size to the testing samples, were selected as the calibration samples to establish the calibration curves. The linear correlation coefficients were 0.999, 0.998, 0.992, 0.995, 0.997 and 0.999 for SiO2, Al2O3, P, MgO, CaO and S, respectively. The contents of SiO2, Al2O3, P, MgO, CaO and S in direct reduced iron were determined according to the experimental method. The relative standard deviation (RSD, n=11) for SiO2, Al2O3, P, MgO, CaO and S was 0.014%, 0.030%, 0.076%, 0.009%, 0.026% and 0.047%, respectively. The proposed method and national standard method were used to determine the contents of SiO2, Al2O3, P, MgO, CaO and S in direct reduced iron, and the results were consistent. The proposed method could meet the requirements of rapid detection of imported direct reduced iron samples.
付亚凤, 赵超, 刘双龙, 艾连峰. 粉末压片制样-波长色散X射线荧光光谱法测定直接还原铁中6种组分[J]. 冶金分析, 2022, 42(7): 76-81.
FU Yafeng, ZHAO Chao, LIU Shuanglong, AI Lianfeng. Determination of six components in direct reduced iron by X-ray fluorescence spectrometry with pressed powder pellet. , 2022, 42(7): 76-81.
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