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Nuclear graphite material preparation method

A technology for nuclear graphite and petroleum coke powder, applied in the field of nuclear graphite material preparation, can solve problems such as high purification cost, and achieve the effects of reducing impurities and boron equivalents, being suitable for large-scale production, and having few production equipment.

Active Publication Date: 2015-03-11
FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of such post-graphitization purification is very expensive
In addition, the purification process can only be used for surface treatment, which may not be effective for internal purification of some formed graphite blocks.

Method used

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preparation example Construction

[0026] Please refer to figure 1 Shown, the present invention discloses a kind of nuclear graphite material preparation method, comprises the following steps:

[0027] (1) kneading

[0028] Put 30-70 parts by weight of petroleum coke powder and 70-30 parts by weight of asphalt powder into a kneader for 0.5-2 h, the temperature is 100-200 degrees, and the particle size of the petroleum coke powder and asphalt powder is less than 20 um .

[0029] (2) Smash

[0030] The product obtained in step (1) is pulverized for the second time, and the particle size is not greater than 40 μm.

[0031] (3) Isostatic pressing

[0032] Put the product obtained in step (2) into a rubber mold, and then put it into an isostatic pressing molding machine for molding with a pressure of 100-300 MPa.

[0033] (4) Roasting

[0034] The product obtained in step (3) is roasted in an atmosphere furnace with halogens or halogenated hydrocarbons, the treatment temperature is 800-1100 ° C, and the haloge...

Embodiment 1

[0043] (1) kneading

[0044] Put 30 parts by weight of petroleum coke powder and 70 parts by weight of asphalt powder into a kneader for 0.5 h at a temperature of 100 degrees, and the particle diameters of the petroleum coke powder and asphalt powder are both less than 20 um.

[0045] (2) Smash

[0046] The product obtained in step (1) is pulverized for the second time, and the particle size is not greater than 40 μm.

[0047] (3) Isostatic pressing

[0048] Put the product obtained in step (2) into a rubber mold, and then put it into an isostatic molding machine for molding with a pressure of 100MPa.

[0049] (4) Roasting

[0050] The product obtained in step (3) is roasted in an atmosphere furnace with halogens or halogenated hydrocarbons at a temperature of 800°C. In this example, the halogens or halogenated hydrocarbons are F 2 .

[0051] (5) Dipping

[0052] The product obtained in step (4) is impregnated with pitch one or more times to deposit additional pitch coke...

Embodiment 2

[0058] (1) kneading

[0059] Put 35 parts by weight of petroleum coke powder and 65 parts by weight of asphalt powder into a kneader for 0.6 h at a temperature of 120 degrees. The particle size of the petroleum coke powder and asphalt powder are both less than 20 um.

[0060] (2) Smash

[0061] The product obtained in step (1) is pulverized for the second time, and the particle size is not greater than 40 μm.

[0062] (3) Isostatic pressing

[0063] Put the product obtained in step (2) into a rubber mold, and then put it into an isostatic molding machine for molding with a pressure of 150MPa.

[0064] (4) Roasting

[0065] The product obtained in step (3) is roasted in an atmosphere furnace with halogen or halogenated hydrocarbon at a temperature of 850°C. In this example, the halogen or halogenated hydrocarbon is Cl 2 .

[0066] (5) Dipping

[0067] The product obtained in step (4) is impregnated with pitch one or more times to deposit additional pitch coke into any ope...

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Abstract

The invention discloses a nuclear graphite material preparation method including the following steps: (1) mixing and kneading; (2) grinding; (3) isostatic compaction; (4) roasting, to be more specific, baking treatment of the product obtained by the step (3) in an atmosphere furnace introduced with halogen or halogenated hydrocarbon at the treatment temperature of 800 to 1100 DEG C; (5) dipping; and (6) roasting; according to the method, in the roasting process, a halogen or halogenated hydrocarbon purified gas is introduced, a purification procedure is inserted in without reduction of the common preparation step, the cost of purification can be greatly reduced, in the roasting process, asphalt volatile components may cause many holes in graphite blocks, the holes greatly facilitate the purified gas to enter into the graphite blocks for purification so as to facilitate further purification of nuclear graphite blocks and great reduction of impurities and boron equivalent; the nuclear graphite material preparation method has the advantages of simple process, convenient operation, less production equipment, can further reduce the cost, and is convenient in popularization and application, and suitable for mass production.

Description

technical field [0001] The invention relates to the technology in the field of graphite production, in particular to a method for preparing a nuclear graphite material. Background technique [0002] With the development of the national economy, the contradiction between energy supply and demand in my country is prominent. Nuclear energy has little environmental pollution and low demand for energy materials. It is an effective means to solve my country's energy problems. Because of low thermal expansion coefficient, excellent thermal shock resistance, and low neutron activation performance, graphite is an excellent neutron deceleration material for nuclear reactors. Its deceleration ratio is second only to heavy water, but its cost is low and natural U can be utilized. Nuclear graphite is a polycrystalline material with a high degree of graphitization and requires high purity to prevent thermal neutrons from being adsorbed on the moderator block, and its isotropy makes it st...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 宋宏芳赵东辉戴涛周鹏伟
Owner FUJIAN XFH NEW ENERGY MATERIALS CO LTD
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