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采用压片制样-能量色散X射线荧光光谱测量铁矿石中11种组分(TFe、MgO、Al2O3、SiO2、P、S、TiO2、CaO、Mn、Cu、Zn)。通过试验确定保持压力30MPa、时间30s的压片制样条件和样品的粒度为200目(74μm),同时,通过采用化学方法定值的生产样品应用于校准曲线的绘制,可最大程度地减少矿物效应和粒度效应对分析结果造成的影响。采用经验系数法进行谱线的重叠校正和组分间的吸收和增强效应校正,各组分校准曲线的相关系数均大于0.999。对同一个铁矿石样品进行精密度考察,各组分测定结果的相对标准偏差(RSD,n=10)为0.14%~5.8%。对铁矿石实际样品进行正确度考察,测定值与滴定法测定全铁、电感耦合等离子体原子发射光谱法(ICP-AES)测定其他元素的分析结果一致。实验方法尤其适用于大宗铁矿石样品的批量分析。
Elemental components (TFe, MgO, Al2O3, SiO2, P, S, TiO2, CaO, Mn, Cu, Zn) in iron ores were measured by tableting - energy dispersive X - ray fluorescence spectrometry. Through the test, we determined the sample preparation conditions and the sample size of 200 mesh (74μm) under the condition of maintaining the pressure of 30MPa and the time of 30s. At the same time, the production of the calibration curve can be minimized by the production of chemical samples Effects and granularity effects on the analysis results. Empirical coefficient method was used to carry out the overlap correction of spectral lines and the absorption and enhancement effects between the components. The correlation coefficients of the calibration curves of all the components were all greater than 0.999. For the same iron ore sample, the relative standard deviation (RSD, n = 10) was 0.14% -5.8%. The accuracy of the actual samples of iron ore was investigated. The results were in good agreement with the results of other elements measured by titrimetric determination of total iron and inductively coupled plasma atomic emission spectrometry (ICP-AES). The experimental method is especially suitable for batch analysis of bulk iron ore samples.