X射线荧光光谱分析多矿源铁矿石中9种成分

Determination of nine components in various source iron ores by X-ray fluorescence spectrometry

铁矿石样品与Li2B4O7、Li2CO3熔剂按比例混合并定量加入钴内标元素（mLi2B4O7：mLi2CO3：mCo2O3：m试样=6：1：1：0．7），采用电加热熔融法制备熔片，以X射线荧光光谱法测定铁矿石中TFe，SiO2，CaO，MgO，TiO2，MnO，Al2O3，P，S9种成分的含量。根据铁矿石中被测成分的含量范围，选取具有含量梯度的铁矿石标准样品，并加入经过化学法准确定值的生产样品，采用内标法，绘制校准曲线。以仪器提供的基体校正方法消除吸收与增强效应影响。方法用于多矿源铁矿石标准样品的分析，测定结果与认定值相一致，相对标准偏差（n=7）为0．10％～8．1％，满足铁矿石的检测需求。

The iron ore sample was mixed in proportion （mLi2B4O7：mLi2CO3：mCo2O3：msample=6：1：1：0.7）, with fusing agents （Li2 B4 O7, Li2 CO3） and cobalt internal standard element added and the fusion piece were then prepared by electric melting method. The contents of nine components in iron ore including TFe, SiO2, CaO, MgO, TiO2, MnO, Al2O3, P and S were determined by X-ray fluorescence spectrometry. On the basis of the content range of testing components in iron ore, the standard samples with content gradient were selected. By means of adding production sample determined accurately by chemical method to the standard samples, the calibration curve was plotted with internal standard method. The absorption and enhancement effects were eliminated by matrix correction method of instrument. The proposed method was applied to the determination of various source iron ore standard samples. The results were in good agreement with the certified values. The relative standard deviation （RSD, n=7） was 0.10 %- 8.1%, which could meet the detection requirements of iron ore.