手持式X射线荧光光谱仪在现场测定铅锌矿中的应用

Application of hand-held X-ray fluorescence spectrometer in determination of lead-zinc ore on site

通过使用手持式X射线荧光光谱仪对铅锌矿含量进行分析,建立了矿山现场快速测定铅锌矿中铅、锌、铜、钼等元素的分析方法。根据待测元素的能量位置,选用35kV为最优电压。比较了铝、钛、镍等滤片的测试效果,使用镍元素滤片配合4mm大准直器能够有效降低钼元素的检出限。为了满足矿山现场实际测定的需要,实验采用无制样直接检测的方法。通过数学校准模型对不同样品表面状态进行校准,实现了现场块状、屑状、粉状等矿山实际样品的良好定量分析。采用实验方法检测标准样品和矿山实际样品中的铅、锌、铜、钼等元素含量,测定值与认定值或其他方法的测定结果相符。准确度偏差能够满足现场选矿的需求,重现性好,检测周期短,已经应用于国内某些大型铅锌矿采矿基地。

The content of lead-zinc ore was analyzed using the hand-held X-ray fluorescence spectrometer.The rapid analysis method of lead,zinc,copper and molybdenum in lead-zinc ore on site was established.According to the energy position of testing elements,the optimal voltage of 35 kV was selected.The determination results of Al,Ti and Ni filter leafs were compared.The detection limit of Mo could be effectively reduced using Ni filter leaf and 4 mm collimator.The direct detection without sample preparation was adopted to meet the analysis requirements of actual samples on site.The surface state of various samples was calibrated by the mathematical model,realizing the quantitative analysis of block,crumb and powdered samples on site.The proposed method was applied to the determination of Pb,Zn,Cu and Mo in standard samples and actual samples.The found results were consistent with the certified values or other methods.The accuracy deviation could meet the requirements of mineral separation.The proposed method exhibited good repeatability and short determination period.It had been applied to some domestic large lead-zinc mining bases.