XRF中白云鄂博矿元素间基体效应及影响系数的研究
发布时间：2018-07-18 16:54
【摘要】：白云鄂博矿在我国稀土产业的发展过程中具有十分重要的地位。因此，以不破坏白云鄂博矿的形态为前提条件下，对其进行快速、准确的分析是非常重要的。X射线荧光光谱分析技术具有可直接对块状、粉末状样品进行分析的特点，同时其还具有分析准确度高、分析元素范围广（Na-U）、分析速度快、操作简便等优点，正好能满足快速准确分析白云鄂博矿进行定性定量分析的要求。同时，X射线荧光光谱仪也是现代矿物成分快速分析的重要分析仪器。 在X射线荧光光谱分析多金属样品时样品中元素之间存在基体效应使得待测的目标元素的品位与所测得的荧光强度值一般并不成线性关系，这就需要对样品元素间基体效应引起的误差进行校正，使得其测量的结果更加准确。一般地，X-RayFluorescence（XRF）分析必须具有标准样品。对于白云鄂博矿，由于所含元素数目多、含量变化范围大，没有、也不可能有与之对应的标准样品，致使得XRF分析误差较大。本文针对白云鄂博矿原矿X荧光分析的特点，，在Genius7000EDXRF（Energy-Dispersive X-Ray Fluorescence）手持式矿物分析仪上开发了针对白云鄂博矿原矿中基体效应的经验系数校正方法，解决XRF分析仪在矿物分析应用中的一个实际问题。 本文采用一种修正的标准样品实现经验系数校正，能够在铁、钙元素大幅度变化时较准确的测量稀土含量。方法是结合前人的经验，人工配制铁、钙元素变化的样品，采用强度校正模型，计算出铁、钙元素对铈元素L系X荧光的增强系数和吸收系数，用于XRF测量铈时的基体效应的校正。将所得的修正系数与铈元素本身的一次荧光影响系数相结合，构建了一组针对白云鄂博矿中铈元素与铁、钙元素之间基体效应的数学校正方程。通过此方程分析白云鄂博矿中铈元素的含量结果准确。对于其它元素，例如硅的影响，由于它们的谱线离开铈L系谱线较远，其基体效应未加考虑。由于镧、铈占白云鄂博矿中总稀土的大部分，且它们的含量比稳定，所以本方法对EDXRF直接测量白云鄂矿中稀土的总含量也有很大帮助。
[Abstract]:Bayan Obo Mine plays an important role in the development of rare earth industry in China. Therefore, under the condition that the morphology of Bayan Obo ore is not destroyed, it is very important to analyze it quickly and accurately. The X-ray fluorescence spectrum analysis technique has the characteristics of direct analysis of block and powder samples. At the same time, it has the advantages of high analytical accuracy, wide range of analysis elements (Na-U), fast analysis speed and simple operation, which can meet the requirements of rapid and accurate analysis of Bayan Obo ore for qualitative and quantitative analysis. At the same time, X-ray fluorescence spectrometer is also an important analytical instrument for rapid analysis of mineral composition. The matrix effect between the elements in the polymetallic sample is found in the X-ray fluorescence spectrum analysis, so that the grade of the target element to be measured does not generally have a linear relationship with the measured fluorescence intensity. Therefore, it is necessary to correct the errors caused by matrix effect between the elements of the sample, so that the measurement results are more accurate. General X-ray fluorescence (XRF) analysis must have a standard sample. For Baiyunebo mine, due to the large number of elements and the wide range of content changes, there are no and no corresponding standard samples, resulting in a large error in XRF analysis. In view of the characteristics of X-ray fluorescence analysis of the raw ore of Bayan Obo Mine, an empirical coefficient correction method for matrix effect in the raw ore of Bayan Obo Mine has been developed on the Genius 7000EDXRF (Energy-Dispersive X-Ray fluorescence) hand-held mineral analyzer. To solve a practical problem in the application of XRF analyzer in mineral analysis. In this paper, a modified standard sample is used to realize empirical coefficient correction, which can accurately measure the content of rare earth when the elements of iron and calcium vary greatly. The method is to calculate the enhancement coefficient and absorption coefficient of Fe and Ca to the X-ray fluorescence of cerium L system by using strength correction model, combining with the previous experience, the samples of iron and calcium are artificially prepared, and the intensity correction model is used to calculate the enhancement coefficient and absorption coefficient of Fe and Ca to the X-ray fluorescence of cerium L system. It is used for the correction of matrix effect in the measurement of cerium by XRF. By combining the correction coefficient with the primary fluorescence effect coefficient of cerium itself, a set of mathematical correction equations for matrix effect between cerium element and iron and calcium elements in Bayan Obo ore are established. The analysis of cerium content in Bayan Obo ore by this equation is accurate. For other elements, such as silicon, the matrix effect is not considered because their spectral lines are far away from the cerium L pedigree. Since lanthanum and cerium account for most of the total rare earths in Baiyunebo ore, and their contents are stable, this method is also helpful to the direct measurement of the total rare earths in Baiyun E ore by EDXRF.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.7
本文编号：2132545
[Abstract]:Bayan Obo Mine plays an important role in the development of rare earth industry in China. Therefore, under the condition that the morphology of Bayan Obo ore is not destroyed, it is very important to analyze it quickly and accurately. The X-ray fluorescence spectrum analysis technique has the characteristics of direct analysis of block and powder samples. At the same time, it has the advantages of high analytical accuracy, wide range of analysis elements (Na-U), fast analysis speed and simple operation, which can meet the requirements of rapid and accurate analysis of Bayan Obo ore for qualitative and quantitative analysis. At the same time, X-ray fluorescence spectrometer is also an important analytical instrument for rapid analysis of mineral composition. The matrix effect between the elements in the polymetallic sample is found in the X-ray fluorescence spectrum analysis, so that the grade of the target element to be measured does not generally have a linear relationship with the measured fluorescence intensity. Therefore, it is necessary to correct the errors caused by matrix effect between the elements of the sample, so that the measurement results are more accurate. General X-ray fluorescence (XRF) analysis must have a standard sample. For Baiyunebo mine, due to the large number of elements and the wide range of content changes, there are no and no corresponding standard samples, resulting in a large error in XRF analysis. In view of the characteristics of X-ray fluorescence analysis of the raw ore of Bayan Obo Mine, an empirical coefficient correction method for matrix effect in the raw ore of Bayan Obo Mine has been developed on the Genius 7000EDXRF (Energy-Dispersive X-Ray fluorescence) hand-held mineral analyzer. To solve a practical problem in the application of XRF analyzer in mineral analysis. In this paper, a modified standard sample is used to realize empirical coefficient correction, which can accurately measure the content of rare earth when the elements of iron and calcium vary greatly. The method is to calculate the enhancement coefficient and absorption coefficient of Fe and Ca to the X-ray fluorescence of cerium L system by using strength correction model, combining with the previous experience, the samples of iron and calcium are artificially prepared, and the intensity correction model is used to calculate the enhancement coefficient and absorption coefficient of Fe and Ca to the X-ray fluorescence of cerium L system. It is used for the correction of matrix effect in the measurement of cerium by XRF. By combining the correction coefficient with the primary fluorescence effect coefficient of cerium itself, a set of mathematical correction equations for matrix effect between cerium element and iron and calcium elements in Bayan Obo ore are established. The analysis of cerium content in Bayan Obo ore by this equation is accurate. For other elements, such as silicon, the matrix effect is not considered because their spectral lines are far away from the cerium L pedigree. Since lanthanum and cerium account for most of the total rare earths in Baiyunebo ore, and their contents are stable, this method is also helpful to the direct measurement of the total rare earths in Baiyun E ore by EDXRF.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.7
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