偏振激发能量色散X射线荧光光谱仪在野外矿区现场实验室的应用探讨

Discussion on the application of polarization excitation energy dispersive X-ray fluorescence spectrometer in field mining on-site laboratory

为提高野外找矿人员工作效率,探索测试设备直接在野外现场服务地质找矿事业的问题,项目组在辽宁丹东野外Fe-Cu-Co矿区以集装箱改造房作为实验测试场所,以小型偏振激发能量色散X射线荧光光谱仪(P-EDXRF)为测试手段,配备相应的电力供应系统、碎样系统以及配套相应的野外测试方法和样品前处理方法,建立了可独立工作的野外现场分析实验室。利用该矿区两个样品,现场进行精密度实验,Fe、Cu、Co 3种元素相对标准偏差(RSD)都在6%以下;利用标准样品GBW07233、GBW07296、GBW07306进行正确度实验,3种元素相对误差在10%以下。将野外现场分析实验室测试数据与找矿单位提供的30件矿区样品中Fe、Cu、Co 3个元素的室内实验室测试数据进行比较,Fe、Cu符合度较高,可以进行定量测试,Co的测试效果相对较差,建议只提供半定量数据,但均可以对其异常区进行准确圈定。研究表明,该类型实验室可以在野外条件下独立承担多种元素的测试工作,达到快速圈定元素异常区的目的,为野外找矿工作发挥现场技术支撑作用。

In order to improve the work efficiency of prospecting persons in field, the direct application of test equipment in field service of prospecting was explored. The project team built a test place in field in Fe-Cu-Co mining area of Liaoning Dandong based on one container reconstruction house. The minitype polarization excitation energy dispersive X-ray fluorescence spectrometer (P-EDXRF) was employed. The corresponding power supply system and sample smashing system were equipped. The field test method and sample pretreatment method were also matched. The laboratory for on-site analysis in field which could be independently operated was established. Two samples from this mining area were used for precision test. The relative standard deviations (RSD) for Fe, Cu and Co were all less than 6%. National standard samples (GBW07233, GBW07296 and GBW07306) were used for trueness test. The relative errors of three elements were less than 10%. The measuring results of 30 samples in laboratory in field were compared with those obtained by other indoor laboratories. It was found that the conformity of Fe and Cu was high and the proposed method could be applied for quantitative analysis. The test results of Co were relatively bad. It suggested providing semi-quantitative data. However, the abnormal areas could be accurately delineated. The experiments showed that this type of on-site laboratory could independently undertake the testing of several elements for the rapid delineation of abnormal areas. The proposed study provided technical support for the prospecting in field.