矿山尾矿中微量银元素快速检测方法的研究

针对矿山尾矿中微量银元素测定的技术难题，提出了一种基于超短光路原理的能量色散X荧光能谱快速检测的方法。提高元素测量分辨率，提高样品分析效率，降低光管功率，延长仪器使用寿命。能谱系统优化了滤片以及探测器屏蔽物等设计，准直器采用对X射线基本无散射的聚四氟乙烯，达到微量银元素的检测要求。实际尾矿测试中，银的检出限达到0.1 mg·kg-1，RSD在0.1%～2.6%之间，准确度在87%～115%之间。对比尾矿、原矿及精矿的检测实验，证明了在能量色散X荧光能谱中引入超短光路设计方法，能够提升系统峰/本底比，满足微量银元素的检测要求。

Rapid Detection Method of Trace Silver in Mine Tailings

Aiming at addressing the technical difficulties in the determination of trace silver in mine tailings ,an energy dispersive X-ray fluorescence energy spectrum method based on ultra short optical path is proposed .It improves the measurement resolu-tion of the elements ,the efficiency of sample analysis and reduces the power of the light tube .What''s more ,it extends the serv-ice life of the instrument .Energy spectrum system optimized filter ,detector shielding design .Besides ,since Teflon has no X-ray scattering as collimator ,the detection of trace elements for silver is achieved .In actual tailings test ,silver detection limit is up to 1mg · kg -1.RSD is between 0.1percent and 2.6 percent while accuracy is between 115% and 87% .With the comparison of tailings ,ore and concentrate test experiment ,it is proved that the energy dispersive X-ray fluorescence spectrum which intro-duced in the method of ultra short optical path can enhance the system peak/background ratio and satisfy the requirement of the detection of trace element .