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Preparation method of high-density ultrafine-aperture graphite

A fine-pore, high-density technology, applied in the field of ultra-fine-pore graphite preparation, can solve the problems of reducing the specific surface area and surface energy of graphite material particles, and the inability to form large-scale products, so as to reduce the specific surface area and surface energy, The effect of reducing processing cost and reducing processing difficulty

Active Publication Date: 2018-10-09
SINOSTEEL NEW MATERIAL ZHEJIANG
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  • Description
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AI Technical Summary

Problems solved by technology

[0008] In view of the above problems, the present invention provides a method for preparing high-density ultra-fine pore graphite, which is obtained by using coke aggregates with an average particle size of 10 to 100 microns and binders after kneading, pressing and roasting, and then using two High-pressure impregnation, using the impregnating agent to block the large pores of the product, so that the large pores are transformed into small pores, and at the same time increase the weight of the product, increase the bulk density, and solve the defects in the ultra-fine pore graphite material that cannot be formed into large-scale products. To realize the preparation of high-density ultra-fine pore graphite materials, to ensure that the graphite material pore size is ≤1 μm, to reduce the specific surface area and surface energy of graphite material particles, and to improve the purity of graphite products through purification during the graphitization process

Method used

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  • Preparation method of high-density ultrafine-aperture graphite
  • Preparation method of high-density ultrafine-aperture graphite
  • Preparation method of high-density ultrafine-aperture graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Such as figure 1 shown

[0082] 1. Raw materials: 70 parts by weight of petroleum coke with an average diameter of 10 μm and 30 parts by weight of pitch.

[0083] 2. Preparation method:

[0084] 1) Raw material selection

[0085] Choose from petroleum coke and pitch.

[0086] It mainly consists of the following raw materials and performance indicators:

[0087] 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%;

[0088] 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% ;

[0089] 2) Ingredients, kneading

[0090] Put the petroleum coke and pitch into the kneader, the temperature is 350°C, and the kneading time is 100min.

[0091] 3) Isostatic pressing

[0092] Put the product obt...

Embodiment 2

[0106] Such as figure 1 shown

[0107] 1. Raw materials: 70 parts by weight of pitch coke with an average diameter of 30 μm and 30 parts by weight of pitch.

[0108] 2. Preparation method:

[0109] 1) Raw material selection

[0110] Select Pitch Coke and Pitch.

[0111] It mainly consists of the following raw materials and performance indicators:

[0112] 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%;

[0113] 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% ;

[0114] 2) Ingredients, kneading

[0115] Put the pitch coke and pitch into the kneader, the temperature is 300°C, and the kneading time is 90min.

[0116] 3) Isostatic pressing

[0117] Put the product obtained in step 3) into a ...

Embodiment 3

[0131] Such as figure 1 shown

[0132] 1. Raw materials: 75 parts by weight of petroleum coke with an average diameter of 50 μm and 25 parts by weight of pitch.

[0133] 2. Preparation method:

[0134] 1) Raw material selection

[0135] Choose from petroleum coke and pitch.

[0136] It mainly consists of the following raw materials and performance indicators:

[0137] 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%;

[0138] 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% ;

[0139] 2) Ingredients, kneading

[0140] Put the petroleum coke and pitch into the kneader, the temperature is 200°C, and the kneading time is 85min.

[0141] 3) Isostatic pressing

[0142] Put the product obtaine...

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Abstract

The invention provides a preparation method of high-density ultrafine-aperture graphite. The preparation method comprises the following steps: rotation of a raw material, stirring and hybrid kneading,compression molding, primary roasting, primary impregnation, secondary roasting, secondary impregnation, roasting for the third time and graphitization. A coke aggregate having an average particle size of 10 to 100 [mu]m and an adhesive are subjected to hybrid kneading, compression molding and roasting, and large pores of a product are blocked with an impregnant through two-times high-pressure impregnation, so that the large pores are turned into small pores, and the technical problem that large-particle aggregates cannot be used for preparing small-aperture graphite is solved; therefore, thelarge-particle aggregates can be used for preparing a small-aperture graphite material, and the aperture of the graphite material is less than or equal to 1 [mu]m; the particle specific surface areaand the surface energy of the graphite material are reduced; and furthermore, in the graphitization process, the purity of a graphite product is improved through purification.

Description

technical field [0001] The invention relates to the technical field of preparation of ultra-fine-pore graphite, in particular to a preparation method of high-density ultra-fine-pore graphite. Background technique [0002] Graphite material can be used as the main core neutron moderator material in nuclear reactor construction, with high purity, high density, high strength, and radiation stability; in addition, graphite has excellent high-temperature mechanical properties. The mechanical properties increase instead of decrease, and it is an excellent core structure material when the temperature of the reactor coolant exceeds 700°C. The molten salt reactor, one of the uses, is different from the high-temperature gas-cooled reactor. In the molten salt reactor, the core moderator graphite is in direct contact with the high-temperature molten salt, and the liquid molten salt will diffuse and penetrate on the surface of the graphite, resulting in local neutron flux. Higher, affec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/528C04B35/64
CPCC04B35/522C04B35/528C04B35/64C04B2235/77C04B2235/96C04B2235/9607
Inventor 黄岱杨辉
Owner SINOSTEEL NEW MATERIAL ZHEJIANG
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