【摘要】：白云鄂博礦在我國稀土產業(yè)的發(fā)展過程中具有十分重要的地位。因此，以不破壞白云鄂博礦的形態(tài)為前提條件下，對其進行快速、準確的分析是非常重要的。X射線熒光光譜分析技術具有可直接對塊狀、粉末狀樣品進行分析的特點，同時其還具有分析準確度高、分析元素范圍廣（Na-U）、分析速度快、操作簡便等優(yōu)點，正好能滿足快速準確分析白云鄂博礦進行定性定量分析的要求。同時，X射線熒光光譜儀也是現(xiàn)代礦物成分快速分析的重要分析儀器。 在X射線熒光光譜分析多金屬樣品時樣品中元素之間存在基體效應使得待測的目標元素的品位與所測得的熒光強度值一般并不成線性關系，這就需要對樣品元素間基體效應引起的誤差進行校正，使得其測量的結果更加準確。一般地，X-RayFluorescence（XRF）分析必須具有標準樣品。對于白云鄂博礦，由于所含元素數(shù)目多、含量變化范圍大，沒有、也不可能有與之對應的標準樣品，致使得XRF分析誤差較大。本文針對白云鄂博礦原礦X熒光分析的特點，，在Genius7000EDXRF（Energy-Dispersive X-Ray Fluorescence）手持式礦物分析儀上開發(fā)了針對白云鄂博礦原礦中基體效應的經(jīng)驗系數(shù)校正方法，解決XRF分析儀在礦物分析應用中的一個實際問題。 本文采用一種修正的標準樣品實現(xiàn)經(jīng)驗系數(shù)校正，能夠在鐵、鈣元素大幅度變化時較準確的測量稀土含量。方法是結合前人的經(jīng)驗，人工配制鐵、鈣元素變化的樣品，采用強度校正模型，計算出鐵、鈣元素對鈰元素L系X熒光的增強系數(shù)和吸收系數(shù)，用于XRF測量鈰時的基體效應的校正。將所得的修正系數(shù)與鈰元素本身的一次熒光影響系數(shù)相結合，構建了一組針對白云鄂博礦中鈰元素與鐵、鈣元素之間基體效應的數(shù)學校正方程。通過此方程分析白云鄂博礦中鈰元素的含量結果準確。對于其它元素，例如硅的影響，由于它們的譜線離開鈰L系譜線較遠，其基體效應未加考慮。由于鑭、鈰占白云鄂博礦中總稀土的大部分，且它們的含量比穩(wěn)定，所以本方法對EDXRF直接測量白云鄂礦中稀土的總含量也有很大幫助。
[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.
【學位授予單位】：內蒙古科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.7

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