Preparation method of nuclear pure grade thorium

A technology for the content of thorium nitrate and thorium, which is applied in the field of thorium purification to achieve the effects of high purity, reduced impurity elements, and easy operation

Active Publication Date: 2016-05-04
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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After investigation, there is no case of purific

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  • Preparation method of nuclear pure grade thorium

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] The steps of this embodiment are as follows figure 1 shown, including the following steps:

[0019] Step 1, dissolving and filtering: after dissolving the analytically pure thorium nitrate with deionized water until the thorium content is 80g / L, adjust the pH value of the thorium nitrate solution to a range of 2.0 with a 10% by volume nitric acid solution, and then filter the solution ;

[0020] Step 2, precipitation and aging: control the solution filtered in step 1 at about 50°C, add a 30% hydrogen peroxide solution dropwise in the solution and stir, wherein the amount of hydrogen peroxide depends on the thorium in the solution The consumption amount is calculated and added, the molar ratio of hydrogen peroxide to thorium is 3:2, and the excess concentration of hydrogen peroxide is maintained at 0.1-0.5mol / L; The pH value of solution is in t...

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Abstract

The invention provides a preparation method of nuclear pure grade thorium. The method includes the steps of dissolution, filtration, precipitation, ageing, burning and the like. The method provided by the invention can effectively lower the content of impurity elements in analytically pure thorium nitrate to less than 10<-6>ug/g content level to reach the nuclear pure grade. And the whole process is easy to operate, the cycle is short, the cost is low, the product purity is high and can reach more than 99.999%, the yield is greater than 97%, and the content of thorium in the filtrate is less than 0.5g/L. The process can effectively reduce the impurity elements of the product, and the prepared thorium product can reach the relevant standards of the state or industry.

Description

technical field [0001] The invention belongs to the technical field of thorium purification methods, and in particular relates to a process for purifying thorium by a precipitation method. Background technique [0002] Thorium is one of the important elements in the research and development of nuclear energy. It is not easy to fission itself, but it can be transformed into fissionable after absorbing neutrons. 233 U, so thorium is a very promising nuclear energy source. In order to meet the needs of thorium nuclear energy research and thorium nuclear power generation, the thorium used as nuclear fuel must reach the nuclear purity level. That is to say, it is required that neutron poisons with larger capture cross sections of thermal neutrons and fast neutrons, such as B, Cd, rare earth and other impurity elements, should be less than (10 -5 ~10 -6 )%, other impurity elements with smaller thermal neutron capture cross section, such as Si, Pb, Zr, P, Al, Ca, Na, Nb, etc., a...

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Application Information

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IPC IPC(8): C22B60/02
CPCC22B60/0291
Inventor 李晓红舒祖俊郭国龙赵凤岐周志全曹淑琴孙浩波孙晓光王海生王春叶
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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