Separation and purification method of trace hafnium in rock

Abstract

The invention belongs to the technical field of radiochemical separation, and discloses a separation and purification method of a trace hafnium in a rock. The method comprises the following two steps that (1), a rock sample is dissolved and adjusted as an HNO3 medium, the medium serves as an upper P350 column of upper column liquid, and then Hf is washed by an eluting agent HNO3, and desorbed by a desorbent HNO3-HCl; (2), an Hf sample in Step (1) is adjusted as an H2SO4-Cit mixed liquid medium, an organic phase is obtained through extraction with N1923-dimethylbenzene, washed by H2SO4-Cit mixed liquid, and then subjected to reverse extraction by HCl-HF mixed liquid, reverse extraction liquid is placed on a TOA chromatographic column, the column is washed by HCl-HF, and effluent liquid is purified Hf product liquid. The method has the advantages that the separation flow is simple, the Hf recovery rate is greater than 98%, and the decontamination factor is high.

Description

technical field [0001] The invention belongs to the technical field of radiochemical separation, and in particular relates to a separation and purification method for trace hafnium in rocks. Background technique [0002] right 182 The analysis and research of Hf occupies an important position in earth science. because 182 The content of Hf is extremely low, and the amount of rock samples to be analyzed is as high as 10g (much larger than the amount used in the analysis of trace elements in geological samples reported in the literature is less than 1g). On the other hand, the rock sample system is very complex, not only containing a large amount of constant matrix elements (Na, K, Ca, Mg, Ba, Al, Fe, Ti), but also many trace elements. Therefore, it is necessary to establish a Hf chemical recovery rate, high decontamination factor and removal 182 W interference separation and purification methods. [0003] The methods for separating hafnium from rock samples mainly includ...

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Problems solved by technology

Fan Jinlong et al. disclosed the separation method of Hf and W in "Research on the Method of Efficient Separation of Hf (Ⅳ) and W (Ⅵ) with Amine Extractants", but they used TOA-xylene liquid-liquid extraction instead of using TOA column , in practical applications, the parameter conditions disclosed in the literature cannot be directly used for

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