Preparation method of thorium dioxide foil

Abstract

The invention belongs to the technical field of reactor simulated fuel pellets and particularly relates to a preparation method of thorium dioxide foil. The method includes: compacting thorium dioxide powder, wherein pressure is 80-90MPa, and pressure maintaining time is 20-25 seconds; adding 0.3% binder polyvinyl alcohol into deionized water to perform heat dissolution, boiling to allow polyvinyl alcohol to be completely dissolved in the deionized water, mixing the solution with granulated thorium dioxide, and crushing and sieving mixed powder, wherein final particle size is controlled to be 150-300 micrometers; using die pressing and cold pressing molding to form the thorium dioxide foil, wherein the inner diameter of the female die of a forming die is a cylindrical structure, forming pressure is 9-11T, pressure maintaining time is 15-20 seconds, the distance between the formed foil and the upper end face of the female die is 20-25mm, and the sintering of the thorium dioxide foil includes a low-temperature heat preservation stage, a medium-temperature heat preservation stage and a high-temperature heat preservation stage. The preparation method has the advantages that difficulties that a green body is difficult in demoulding, the green body breaks and green body edges fall off are solved, and the thorium dioxide foil green body good in surface quality is obtained.

Description

technical field [0001] The invention belongs to the technical field of reactor simulated fuel pellets, and in particular relates to a preparation method of thorium dioxide foil. Background technique [0002] With the development of nuclear power, the demand for nuclear fuel is gradually increasing, but the main nuclear fuel uranium resources are not abundant in our country. Therefore, in recent years, under the condition of accepting relevant supervision and ensuring the peaceful use of nuclear fuel, we have cooperated successively with Australia, Kyrgyzstan and other countries. Signed an agreement on joint development and import of uranium ore. As a potential nuclear fuel, thorium has broad application prospects. At present, the proven reserves of thorium on the earth are three times that of uranium, and thorium can be converted into 233 U, will greatly enrich nuclear fuel resources, and my country's thorium resources are relatively rich and concentrated. The thorium resou...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of thorium dioxide foil, which successfully solves the difficulties of demoulding the green body, the breakage of the green body, and the edge drop of the green body, and obtains the green body of the thorium dioxide foil with better surface quality