Determination of eight components in aluminum refractory containing silicon carbide by X-ray fluorescence spectrometry with pressed powder pellet
ZHANG Lei1,2, CHEN Ningna1,2, XU Chao1,2
1. Wuhan Research Institute of Metallurgical Construction, MCC, Wuhan 430080, China; 2. Testing Center for Refractory Materials of Zhongye, Wuhan 430080, China
Abstract：The refractories containing silicon carbide have been widely used in metallurgical furnace charge. At present, the determination of refractories containing silicon carbide often adopts wet analysis method. However, these methods are tedious and time-consuming, which is not suitable for the batch inspection. The sample was prepared by pressed powder pellet with thin polyester (PET) film for package. The microcrystalline cellulose was selected as the binder. The certified reference materials of aluminum-silicon refractory and silicon carbide with the same particle size, similar matrix and content gradient as the sample were selected to prepare a series of calibration samples of aluminum refractory containing silicon carbide with certain content gradient from low to high according to different proportion. Then the calibration curves were fitted with those calibration samples. Consequently, a method for the rapid analysis and simultaneous determination of TSi, Fe2O3, Al2O3, CaO, MgO, TiO2, P2O5 and K2O in aluminum refractory containing silicon carbide was established by X-ray fluorescence spectrometry (XRF). PET film was introduced into pack the pressed powder pellet, which not only reduced the dust contamination and the damage probability of the instrument to a minimum, but also prevented the sample from being exposed to the air, thus increasing the preservation time of the pellet. The precision tests for determination of eight components in aluminum refractory samples containing silicon carbide were conducted. The relative standard deviations (RSD, n=10) of determination results were between 0.08% and 3.7%. The proposed method was applied for determination of calibration sample (which was not used for the preparation of calibration curve) and actual sample of aluminum refractory containing silicon carbide. The results were consistent with the reference values or those obtained by the national standard method.
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