On-line Determination of Rare Earth Distribution by Energy Dispersive X-ray Fluorescence Spectrometry
作者单位：NCS Testing Technology Co. Ltd. China Iron and Steel Research Institute Group
会议名称：《第十六届全国稀土分析化学学术研讨会》
会议日期：2017年
学科分类：080603[工学-有色金属冶金] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 070302[理学-分析化学] 0703[理学-化学]
关 键 词：ED-XRF Rare Earth Element Distribution On-line
摘 要：Rare earth elements（REEs） have been widely used in metallurgical machinery, electronic information, petrochemical, energy and other fields due to their unique physical and chemical properties. The REEs with enhanced optical, electrical and magnetic properties can be used to prepare advanced materials, such as fluorescent, polishing, catalytic and permanent magnetic materials. The indispensible REEs in the advanced materials, despite with trace amount, are known as industrial vitamins. The preparation of unitary REE with high purity is fundamental to the industry of new rare earth material. The unitary REE is separated by hydrometallurgical process from rare earth concentrate with more than ten kinds of rare earth elements. The continuous separation process is evaluated by REE distributions. At present, most of the REE distributions in factories are obtained via artificial sampling coupled with ICP OES. The detection lags behind the production, resulting in unstable qualities of products. In order to determine the distributions of REEs on line, a XOR-50 rare earth distribution on-line analytical equipment was developed based on ED-XRF. A on-line determination of REE in rare earth separation process was established. The excitation voltage, current and filter were optimized according to the characteristics of REEs. The influence of the salinity was corrected by mathematical technique. The absorption enhancement effect was calculated by fundamental parameter method. The results of on-line detection are consistent with ICP OES. The relative standard deviation（n=11） of the main REEs（w 1%） is less than 0.6%. The equipment can carry out automatically from the extraction solution in 1 minute. The measurement intervals can be set by the operator. Combining on-line introduction of the rare earth material, simultaneous analysis of multi elements, rapid detection in 1 minute, on-line analysis with self-starting and real-time transmission of the results, the method meets the r