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Thorium element and rare earth element separation method and separation reagent

A separation method and rare earth element technology, applied in the direction of improving process efficiency, can solve the problems of difficult stripping, expensive reagents, etc., and achieve the effects of avoiding low solubility, simple extraction system and high extraction efficiency

Inactive Publication Date: 2014-11-26
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are some limitations in the extraction process of these extractants, such as expensive reagents, multiple steps are required, and stripping is difficult

Method used

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  • Thorium element and rare earth element separation method and separation reagent
  • Thorium element and rare earth element separation method and separation reagent

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Experimental program
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Embodiment Construction

[0017] specific implementation plan

[0018] The present invention is illustrated below in conjunction with specific embodiments.

[0019] The extractant 1-methylimidazole specifically used in the present invention can be obtained commercially. The diluent used in the present invention is the conventional solvent n-amyl alcohol.

[0020] The results of some specific experiments are provided below:

[0021] Take 0.5 mL of n-amyl alcohol dissolved with a certain amount of extractant 1-methylimidazole and add it to the centrifuge tube. In the example, the concentration of 1-methylimidazole is 0.1 molL -1 ~1.5molL -1 , adding 4×10 -4 moL -1 , pH = 3 nitrate solution 5mL, shake in the shaker at 298K for 10 minutes, take out and centrifuge for 3 minutes, take the upper aqueous phase to measure the concentration of metal ions to calculate the distribution ratio respectively, the results are as follows figure 1 shown.

[0022] pass figure 1 It can be seen from the data that...

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Abstract

The invention discloses a method for separation of thorium elements from rare earth elements and an extraction agent used in the method. According to the method, a mixed aqueous solution of thorium and rare earth nitrate is subjected to extraction through an n-amyl alcohol diluent, wherein the extraction agent is dissolved in the n-amyl alcohol diluent; the thorium elements are extracted, and the rare earth elements are lest in an aqueous phase. The extraction agent used in the method is 1- methylimidazole as shown in formula 1. The method for separation of the thorium elements from the rare earth elements and the extraction agent used in the method have the advantages that the extraction agent is low in price and easy to obtain, an extraction system is relatively simple, extraction efficiency is quite high, the quantity of the used extraction agent is quite small, and the specificity is strong.

Description

technical field [0001] The invention relates to a method for separating radioactive thorium and rare earth elements and the used extraction agent. Background technique [0002] Thorium is a naturally occurring radioactive element, 232 Th with 238 Like U, it is a fertile nuclide, which captures neutrons to generate fissile nuclides with good nuclear properties 233 U. through the proliferative pathway 232 Th converts to 233 U will greatly enrich nuclear fuel resources. In nature, thorium mainly exists in monazite, which is associated with rare earth elements. Therefore, it is very important to separate thorium from rare earth elements, which not only avoids the pollution of the environment by radioactive thorium during the extraction of rare earths, but also enriches the resources of nuclear fuel. There are several methods for separating thorium from rare earth elements, the most important of which is solvent extraction. A variety of extractants have been used to separa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/36C22B59/00C22B60/02
CPCY02P10/20
Inventor 沈颖林李文奎吴建荣刘子义吴王锁
Owner LANZHOU UNIVERSITY
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