Method for preparing uranous solution

Abstract

The invention discloses a method for preparing uranous solution, which comprises the following steps of: adding an organic reducing agent and a catalyst into acidic solution of uranyl ions, and reacting under the action of the catalyst to reduce the uranyl ions into uranous ions. The method for preparing the uranous solution used in the nuclear fuel reprocessing industry is high in uranium conversion rate, easy and convenient to operate, mild in reaction conditions and high in prepared uranous concentration.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel reprocessing, in particular to a method for preparing a tetravalent uranium solution. Background technique [0002] Nuclear fuel reprocessing is an important part of the nuclear fuel cycle, and its main task is to remove fission products from spent reactor fuel and recover fissile materials ( 239 Pu, 233、235 U) and convertible material ( 238 U). After more than 60 years of development of nuclear fuel reprocessing, it is generally believed that the Purex process is a feasible, economical and reliable method, and it occupies a dominant position in the reprocessing of reactor spent fuel. [0003] The essence of the Purex process is to use TBP's high extractability of uranium and plutonium and the easy redox property of plutonium to realize the extraction and mutual separation of uranium and plutonium. A typical Purex process includes three extraction cycles of co-decontamination and separati...

AI Technical Summary

Problems solved by technology

However, the equipment required for the preparation of U(IV) by hydrogenation catalytic reduction is relatively complicated, consisting of a series of high-pressure reactors, high-pressure separators, and low-pressure separators.

In addition, this process uses high-pressure hydrogen as the reducing agent, and the pressure of the gas in the industrial reactor reaches 10MPa, which is a great safety hazard in the highly radioactive nuclear fuel reprocessing workshop

[0008] At present, only some researchers in Russia have carried out studies on the kinetics and reaction mechanism of reducing low-concentration U(VI) with hydrazine, formic acid, etc., such as "Reactivity of Platinum Nanoaggregates in Radiochemistry" in 2007 and 2008, respectively. Catalytic Reduction of U(VI)with Hydrazine in Acid Solutions", "Catalytic Reduction of U(VI)with Formic Acid in Acid Solutions on Palladium Catalysts", "Catalytic Reduction of U(VI)with Hydrazine on Palladium Catalysts in Acid Solutions" The three articles only briefly introduced the kinetics and reaction mechanism of reducing low-concentration U(VI) with hydrazine, formic acid, etc., but did not specifically propose a method for preparing tetravalent uranium suitable for post-processing industrial applications.