Determination of major and minor components in defoamer for desilicication of pretreatment of hot metal byX-ray fluorescence spectrometry with fusion sample preparation
GUO Yun-tao, LIU Wei, DAI Xue-qian
Technology Center of Shanxi Taigang Stainless Steel Co.,Ltd., Taiyuan 030003, China
Abstract：With lithium tetraborate and lithium metaborate mixture [m(Li2B4O7)∶m(LiBO2)=67∶33] as flux, the defoamer sample was made into fused bead at the dilution ratio of 1∶10 through fusion at 950 ℃ for 18 min using five drops of 200 g/L ammonium bromide as release agent. The calibration curve was established with synthetic calibration sample that was prepared by adding standard sodium carbonate into limestone standard sample. Thus, a method for simultaneous determination of major and minor components of SiO2, Al2O3, CaO, MgO, Fe2O3, Na2O, etc. in defoamer for desilicication of preparation of hot metal was established by X-ray fluorescence spectrometry (XRF). The loss on ignition(LOI) was treated as elimination component. After correction by COLA mode, the content of major and minor component in the sample without ignition could be accurately determined with the calibrated curve, which greatly shortened the analysis period. Through validation, the relative standard deviations (RSD, n=11) of each component were all within 2%, and the analytical results of actual defoamer sample were consistent with those of chemistry method.
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GUO Yun-tao, LIU Wei, DAI Xue-qian. Determination of major and minor components in defoamer for desilicication of pretreatment of hot metal byX-ray fluorescence spectrometry with fusion sample preparation. , 2015, 35(1): 50-54.
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