| X-ray fluorescence spectroscopy(XRF)is widely used in environmental,geological and industrial fields due to its simplicity,reliability,multi-element simultaneous analysis,low cost and rapid detection.With the development of industrial transformation,XRF has been receiving more and more attention because it can provide timely detection data for process control and meet the needs of industrial information and intelligent transformation.For XRF testing of most industrial materials,fluctuations in the moisture of materials are one of the most common factors affecting the accuracy of their analytical results.In this paper,the water-quenched iron slag of typical water-containing materials in steel plants is studied by theoretical derivation,simulation calculation and experimental verification.The physical mechanism of the influence of material moisture fluctuation on XRF measurement results is studied and a corresponding correction model is established to improve the XRF pair.The accuracy of the detection of hydrated materials.The main research of this paper: based on the interaction between X-ray and matter,theoretically study the physical mechanism of water influence on XRF and its variation law,and derive the X-ray theoretical strength formula of water-quenched slag sample characteristics under different water content.According to theoretical research,using XMI-MSIM simulation software to establish an XRF instrument and two different water-quenched slag sample models to study the influence of samples on the XRF detection energy spectrum.Combined with theoretical research and simulation results,the sample moisture intensity correction model is established.Finally,XRF experiments were carried out on different water content water-quenched slag samples to verify the effectiveness of the water cut correction model.The main results of this paper are as follows:1.Theoretical derivation: With the increase of water content of the water-quenched slag sample,the effective atomic number of the sample,the S content of the sample and the mass absorption coefficient of the X-ray fluorescence(2.31 keV)of the S element are linearly reduced.2.It is simulated that the decrease of the mass absorption coefficient of the water-quenched slag sample will increase the Characteristic X-ray intensity of the S element,and the decrease of the element content will reduce the Characteristic X-ray intensity of the S element.When these two factors work together,the Characteristic X-ray intensity of the S element is lowered.At the same time,the simulation results show that the background spectrum of the energy spectrum increases with the increase of moisture content of the sample.3.According to the theoretical derivation and simulation study,the effect of sample moisture content on the X-ray fluorescence intensity of elemental features and the relationship between energy spectrum background count and sample moisture content,the characteristic X-ray moisture content correction model of target element characteristics was established.4.Experimental measurement of water-quenched slag sample: The characteristic X-ray intensity of S and Ca elements before and after correction and the relative error of water-quenched slag sample after drying are reduced from 8%-27% to 6%;the quantitative analysis results of the modified model are compared with the third-party test.The maximum content error of S element and Ca element is less than 0.11% and 1.5%,respectively.In this paper,the mechanism and law of the influence of water content fluctuation of waterquenched slag sample on XRF detection are studied by theoretical calculation and simulation.The modified model of water-quenched slag moisture content is deduced and the experimental model is determined to be effective for water content fluctuation water-quenched slag samples.The correction method improves the accuracy of the measurement results. |
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