Preparation method of thorium dioxide foil

A technology of thorium dioxide foil and thorium dioxide, which is applied in the manufacture of reactors, reactors, and reduction of greenhouse gases, can solve the problems of difficult demoulding of green bodies, edge falling of green bodies, and green body fractures, etc., to achieve unique selection, Easy to operate and solve the effect of difficult demoulding

Inactive Publication Date: 2017-07-07
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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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

Method used

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with specific embodiments.

[0018] A preparation method of thorium dioxide foil, comprising the following steps:

[0019] The thickness of the foil is 0.5-1mm, the diameter is 29-31mm, and it is a circular sheet structure.

[0020] Step 1, Thorium dioxide foil powder preparation

[0021] Step 1.1, powder granulation, the thorium content of the thorium dioxide powder used in the present invention is 87.3%. The original powder is compacted, and the compact is pressed by a pressing process with a pressure of 80-90MPa and a holding time of 20-25s. After the compact is crushed and screened, particles between 150μm and 300μm are obtained as finished pellets. After the powder passes through the granulation process, the fluidity and molding ability can be improved, so the thorium dioxide raw powder is granulated.

[0022] Step 1.2, binder is added, and 0.3% binder polyvinyl alcohol (PVA) is put into deio...

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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...

Claims

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Application Information

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IPC IPC(8): G21C21/00
CPCG21C21/00Y02E30/30
Inventor 郭洪茹利利刘文涛何亚斌翟晶晶刘业光
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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