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Nuclear fuel matrix graphite powder, nuclear fuel graphite matrix material and preparation method

A technology for base material and nuclear fuel, which is applied in the fields of reactor fuel material, nuclear power generation, and greenhouse gas reduction, etc., can solve the problems of time-consuming and involve many steps, and achieve the effects of simplifying equipment, improving preparation efficiency and operating safety.

Pending Publication Date: 2021-10-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The powder obtained by the matrix graphite powder preparation process has better uniformity, better pressing performance and final product performance, but the wet operation of the whole process involves many steps and takes a long time

Method used

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  • Nuclear fuel matrix graphite powder, nuclear fuel graphite matrix material and preparation method
  • Nuclear fuel matrix graphite powder, nuclear fuel graphite matrix material and preparation method
  • Nuclear fuel matrix graphite powder, nuclear fuel graphite matrix material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. A preparation method of nuclear fuel matrix graphite powder, its technological process is shown in figure 1 , the preparation method comprises the steps of:

[0046] The natural flake graphite powder (ash content 26ppm, graphitization degree 96, D50 is 78.22μm) is mechanically crushed to D50 of 32.84μm; artificial graphite powder (ash content is 12ppm, graphitization degree is 88, D50 is 163.56μm) is crushed To D50 is 47.74μm;

[0047] Using phenolic resin as binder, its average molecular weight is 1050, its softening point is 110°C, the residual carbon rate is 51%, and the ash content is 32ppm; the phenolic resin is pulverized until D50 is 4.3μm.

[0048] The instrument used for particle size testing of the above-mentioned graphite powder and phenolic resin powder is a Bettersize 2000B laser particle size analyzer.

[0049] The above-mentioned natural graphite powder, artificial graphite powder, and phenolic resin were homogeneously mixed in a powder three-dimens...

Embodiment 2

[0055] 1. A preparation method of nuclear fuel matrix graphite powder, its technological process is shown in image 3 , the preparation method comprises the steps of:

[0056] Use the pulverized natural graphite powder, artificial graphite powder, phenolic resin powder in embodiment 1 as raw material;

[0057] Take the above-mentioned natural graphite powder and phenolic resin at a weight ratio of 4:1, and mix them uniformly in a three-dimensional powder mixing equipment for 30 minutes; put the obtained mixture into a mechanical fusion equipment for processing; The relative rotational speed of the cylinder was 3500 rpm, and the processing time was 30 minutes to obtain the first fusion.

[0058] Take the above-mentioned artificial graphite powder and phenolic resin at a weight ratio of 4:1, and mix them homogeneously for 30 minutes in a powder three-dimensional mixing equipment. Next, the obtained mixture was placed into a mechanical fusion device. During the mixing process, ...

Embodiment 3

[0063] 1. A preparation method of nuclear fuel matrix graphite powder, its technological process is shown in figure 1 , the preparation method comprises the steps of:

[0064] Use natural graphite powder after pulverizing in embodiment 1, artificial graphite powder as raw material;

[0065] Use mesophase pitch (prepared by polymerization with petroleum pitch as raw material, the mesophase content is 50%) as the binder, the softening point is 246°C, and the carbon residue rate is 70%; the mesophase pitch is crushed until the D50 is 3.9 μm .

[0066] The instrument used for particle size testing of the above-mentioned graphite powder and mesophase pitch powder is the Bettersize 2000B laser particle size analyzer.

[0067] The above-mentioned natural graphite powder, artificial graphite powder, and mesophase pitch were homogeneously mixed for 30 minutes in a powder three-dimensional mixing equipment, wherein the weight ratio of natural graphite powder and artificial graphite p...

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Abstract

The embodiment of the invention relates to nuclear fuel matrix graphite powder, a nuclear fuel graphite matrix material and a preparation method. The preparation method of the nuclear fuel matrix graphite powder provided by the invention comprises the following steps of: mixing natural graphite powder, artificial graphite powder and a solid binder; and adding the mixture into fusion equipment for treatment, the fusion equipment being used for providing pressure stress and shear force for the powder, so as to coat the surface of the graphite powder with the binder. The matrix graphite powder is prepared by using a mechanical fusion method in the field for the first time. The natural graphite powder, the artificial graphite powder and the solid binder are used as raw materials. A dry process is adopted, and the current situation that only a wet preparation process is adopted for the matrix graphite powder in the field is broken through. A solvent is not required to be introduced. The single-batch preparation time is shortened to 1-2 h from 30-50 h of an existing wet process, and the energy consumption is only 1 / 40-1 / 20 of that of the existing wet process. A coating effect similar to that of a traditional wet process can be obtained. The used equipment is more simplified. The production cost is effectively reduced, and the economic benefit and the social benefit are high.

Description

technical field [0001] The invention relates to the field of nuclear graphite materials, in particular to a nuclear fuel matrix graphite powder, a nuclear fuel graphite matrix material and a preparation method. Background technique [0002] Graphite material has many advantages such as high neutron moderation ability, low neutron absorption cross section, good radiation performance, low thermal expansion coefficient and high thermal conductivity, and excellent mechanical properties at high temperature, and has mature processing and manufacturing technology. , these properties determine its wide application in nuclear reactors. In addition to being used as a reactor structural material, various reactor types of nuclear fuel also use graphite as a carrier, and the fuel particles are distributed in the graphite matrix. Graphite is used as the base material. [0003] High-temperature gas-cooled reactors are mainly divided into pebble bed reactors and columnar reactors due to d...

Claims

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Application Information

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IPC IPC(8): C04B35/532C04B35/524C04B35/628C04B35/622G21C3/58
CPCC04B35/522C04B35/524C04B35/532C04B35/62839C04B35/622G21C3/58C04B2201/50C04B2201/32C04B2201/20Y02E30/30
Inventor 卢振明刘兵张杰周湘文李江华王磊唐亚平
Owner TSINGHUA UNIV
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