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Large-dimension nuclear graphite material for reactor internal of high-temperature gas cooled reactor and preparation method

A technology of high-temperature gas-cooled reactors and internal components, which is applied in the field of nuclear graphite production and can solve problems such as complex procedures and low efficiency

Active Publication Date: 2018-07-31
SINOSTEEL NEW MATERIAL ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] CN201410638623.1 (publication number is CN104401982A) discloses a preparation method of nuclear graphite material, which adopts kneading, pulverization, isostatic pressing, roasting, impregnation, re-calcination and graphitization treatment. The purification and graphitization of the obtained nuclear graphite block are carried out separately, and the process is complicated and inefficient due to multiple purifications; in addition, the patent purifies by introducing a halogen or halogenated hydrocarbon atmosphere in a roasting process, because the The primary calcination temperature is 800-1100°C, which is much lower than the boiling point of the high melting point compound formed by carbon in the nuclear graphite material, and some high boiling point halides cannot be removed by this method

Method used

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  • Large-dimension nuclear graphite material for reactor internal of high-temperature gas cooled reactor and preparation method
  • Large-dimension nuclear graphite material for reactor internal of high-temperature gas cooled reactor and preparation method
  • Large-dimension nuclear graphite material for reactor internal of high-temperature gas cooled reactor and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] 1. Raw materials: 80 parts by weight of pitch coke and 20 parts by weight of pitch;

[0128] 2. Preparation method:

[0129] 1) Raw material selection: select pitch coke and pitch.

[0130] Pitch coke: fixed carbon content ≥ 98.5%, ash content ≤ 0.5%, boron (B), gadolinium (Gd) less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) Less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.5%;

[0131] Asphalt: ash content ≤0.5%, volatile content 35-60%, coking value 40-70%, softening point 80-200℃, quinoline insoluble matter 8-25%, toluene insoluble matter 25-55% ;

[0132] 2) Raw material grinding

[0133] Grinding the pitch coke in step 1) until the average particle size does not exceed 50 μm.

[0134] 3) Ingredients and kneading

[0135] Set the parameters of the high-precision automatic metering system, weigh pitch coke and pitch according to the ratio, and put them into the continuous strong double-roll kneader at a temperature of 150°C and a kneadin...

Embodiment 2

[0146] 1. Raw materials: 70 parts by weight of petroleum coke and 30 parts by weight of pitch.

[0147] 2. Preparation method:

[0148] 1) Raw material selection

[0149] Choose from petroleum coke and pitch.

[0150] It mainly consists of the following raw materials and performance indicators:

[0151] Petroleum coke: fixed carbon content ≥98.5%, ash content ≤0.5%, boron (B), gadolinium (Gd) are less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) Less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.5%;

[0152] Asphalt: ash content ≤0.5%, volatile content 35-60%, coking value 40-70%, softening point 80-200℃, quinoline insoluble matter 8-25%, toluene insoluble matter 25-55% ;

[0153] 2) Raw material grinding

[0154] Grinding the petroleum coke in step 1) until the average particle size does not exceed 50 μm.

[0155] 3) Ingredients and kneading

[0156] Put the petroleum coke and pitch into the kneader, the temperature is 200°C, and the kneading time...

Embodiment 3

[0166] 1. Raw materials: 65 parts by weight of pitch coke and 35 parts by weight of pitch.

[0167] 2. Preparation method:

[0168] 1) Raw material selection

[0169] Select Pitch Coke and Pitch.

[0170] It mainly consists of the following raw materials and performance indicators:

[0171] Pitch coke: fixed carbon content ≥ 98.5%, ash content ≤ 0.5%, boron (B), gadolinium (Gd) less than 0.1ppm, samarium (Sm), europium (Eu), cadmium (Cd) and lithium (Li) Less than 0.5ppm, moisture ≤0.5%, sulfur ≤0.5%;

[0172] Asphalt: ash content ≤0.5%, volatile content 35-60%, coking value 40-70%, softening point 80-200℃, quinoline insoluble matter 8-25%, toluene insoluble matter 25-55% ;

[0173] 2) Raw material grinding

[0174] Grinding the petroleum coke in step 1) until the average particle size does not exceed 40 μm.

[0175] 3) Ingredients and kneading

[0176] Weigh petroleum coke and pitch according to the proportion, put them into a kneader, the temperature is 250°C, and th...

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Abstract

The invention relates to a large-dimension nuclear graphite material for a reactor internal of a high-temperature gas cooled reactor and a preparation method. The method comprises the following stepsof: raw material selection, grinding, mixing-kneading, forming, roasting, 0 to 1 time of impregnation, and graphitization / nuclear-pure processing. The large-dimension nuclear graphite material is simple in process and convenient to operate and adopts little production equipment, so that cost is further reduced; the large-dimension nuclear graphite material is convenient to popularize and apply andis applicable to large-scale production; compared with the prior art, the provided product has a large scale and has neutron irradiation performance data.

Description

technical field [0001] The invention relates to a technology in the field of nuclear graphite production, in particular to a large-size nuclear graphite material used for internal components of a high-temperature gas-cooled reactor and a preparation method thereof. Background technique [0002] Graphite is used in thermal neutron reactors, and is also expected to be used in fusion reactors. In thermal neutron reactors, it can be used as a neutron moderator in the fuel zone, a reflector material around the fuel zone, and a structural material inside the core. [0003] Nuclear graphite is a graphite material used in the nuclear industry. [0004] Nuclear graphite is used as the core component in the high-temperature gas-cooled reactor and directly contacts all products of nuclear fission. Therefore, the advanced technology of the material itself, the reliability and repeatability of performance, and the large-scale large-scale graphite material manufacturing The stability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/532
CPCC04B35/522C04B35/532C04B2235/77C04B2235/95C04B2235/96C04B2235/9607
Inventor 黄岱杨辉李贺曹曙林
Owner SINOSTEEL NEW MATERIAL ZHEJIANG
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