Preparation method of nuclear pure grade thorium

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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Problems solved by technology

After investigation, there is no case of purification of thorium products by precipitation method

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