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一、前言有关高纯稀土中痕量稀土杂质的化学光谱法,常采用萃取色层法进行分离。斯玛涅科娃最早曾用P204为萃取剂、硅球为载体、用0.4N盐酸淋洗,使镧与铈等其它稀土元素分离,用于高纯氧化镧中微量稀土杂质测定。但此法镱、镥等元素不易反萃,且萃取剂及硅烷容易流失;由于P507比P204可在较低酸度下进行分离,有利于重稀土的反萃,已开始用于高纯氧化钇及氧化钕的测定,但此法由于采用纯盐酸体系,主体拖尾现象严重,与杂质元素不易达到较好的定量分离,且萃取剂仍易流失,使浓缩物中含有大
First, the preface The trace rare earth impurities in high purity rare earth chemical spectroscopy, often using extraction chromatography for separation. Simanecova earliest used P204 as extractant, silicon ball carrier, rinsed with 0.4N hydrochloric acid, lanthanum and other rare earth elements such as cerium separation, for trace impurities in high purity lanthanum oxide. However, this method ytterbium, thulium and other elements is not easy to stripping, and the extractant and silane easy to lose; As P507 than P204 can be separated at a lower acidity, is conducive to heavy rare earth stripping, has begun to be used for high purity yttrium oxide and Neodymium oxide, but this method due to the use of pure hydrochloric acid system, the main tailing phenomenon is serious, difficult to achieve a better quantitative separation with impurity elements, and the extractant is still easy to drain, so that the concentrate contains large