X射线荧光分析法测定铁矿石中全铁

Determination of total iron in iron ores using X-ray fluorescence analysis

铁矿石中全铁的含量范围通常较宽,因此需要高的分析精确度。尽管熔融制样法已经被普遍用于铁矿石的X射线荧光光谱分析,但作为样品制备的另一种方法,压片法由于简便、快捷的特点,其应用需求同样较大。康普顿散射比法已经被普遍用于岩石等样品中的重金属元素测定,其中荧光X射线与X射线管线发射的康普顿散射X射线的强度比被用作校正。不过,这种方法不能为矿石和精矿中高含量重金属元素的测定提供足够的准确度。本研究建立了一种新的方法,在元素间校正项中,将基本参数法获取的理论α系数用于康普顿散射比校正。本方法可以将铁矿石中全铁含量的测定准确度提高到0.14%(质量分数)。

High precision is required for the analysis of total iron content which has a wide range of concentration in iron ores.Fusion bead method has been commonly used in X-ray fluorescence spectrometry for the iron ore analysis.However,there is a strong demand of using pressed pellet method because it is simple and quick sample preparation method.Compton scattering ratio method,in which the intensity ratio of fluorescent X-rays to Compton scattering X-rays from X-ray tube line is used for the calibration,has been common for the determination of heavy elements in samples such as rocks.However,this method does not give adequate accuracy for high content heavy elements in ores and concentrates.A new method in which inter-element correction term using theoretical alphas obtained by a fundamental parameter method is added to Compton scattering ratio calibration has been developed,and 0.14%（mass fraction） of accuracy for total iron determination in iron ores could be achieved.