CN104495799A - Preparation method of high-purity nuclear graphite - Google Patents
Preparation method of high-purity nuclear graphite Download PDFInfo
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- CN104495799A CN104495799A CN201410704891.9A CN201410704891A CN104495799A CN 104495799 A CN104495799 A CN 104495799A CN 201410704891 A CN201410704891 A CN 201410704891A CN 104495799 A CN104495799 A CN 104495799A
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Abstract
The invention discloses a preparation method of high-purity nuclear graphite, and provides graphite, wherein the ash content of the graphite is less than about 300 ppm; the boron equivalent of the graphite is less than about 5.0 ppm; and the isotropous ratio of the graphite is about 0.85-1.5, which is calculated by dividing the CTE (Coefficient of Thermal Expansion) in the crosscutting texture direction by the CTE in the texture direction. The preparation method disclosed by the invention comprises the following steps of: grinding uncalcined needle coke into fine powder, mixing the fine coke powder with an adhesion agent, namely asphalt, then, grinding the mixture to form moulding powder, uniformly moulding the powder to form an expected shape of a graphite part, and roasting, densifying and graphitizing the blank product so as to obtain high-purity graphite having high isotropy. The high-purity nuclear graphite prepared by the invention is free from impurities and still has improved isotropy and controllable average density and bending strength; and thus, the high-purity nuclear graphite can be applied to a new generation of nuclear fission and ultra-high-temperature reactors.
Description
Technical field
The present invention relates to graphite technology field, particularly a kind of high purity nuclear graphite preparation method.
Background technology
China is natural graphite resource big country, and reserves, output and export volume all occupy first place in the world.But because technological development drops into not, at present still based on raw material production and processing crystalline flake graphite.Carbon-graphite material is the brand-new material that prospect is very large, is widely used in high-tech area.
At present, the soft graphite industry of U.S., day, moral, method occupies first place, and wherein high-purity soft graphite only has Japan to produce, and whole world soft graphite output is 1.5-2.0 more than ten thousand tons to the maximum.China's soft graphite NPD projects, just in development, achieves the achievement of a collection of soft graphite processing technology and equipment in " eight or the five " phase, but is still in advanced development at present.China's lithium ion battery is also in the lab scale stage.
Soft graphite, not only for sealing, has conduction, heat conduction, lubrication, high-low temperature resistant, the excellent specific property such as anticorrosive simultaneously, just because of this, so for many years the purposes of soft graphite in continuous expansion.The thermo electric material utilizing its electroconductibility and workability to make, can be used for some bad working environments.
Due to the excellent specific property of soft graphite, developing nuclear energy super low sulfur and high-purity grade of soft graphite processing technology and equipment is future development target, and highly purified flexible core graphite material is critical.
Summary of the invention
The invention discloses a kind of high purity nuclear graphite preparation method, this graphite meets the graphite material requirement for developing nuclear-energy plant equipment, high purity, inclusion-free, has the isotropy of improvement and controlled mean density and flexural strength.
Technical scheme of the present invention is achieved in that
A kind of high purity nuclear graphite preparation method, is completed by following steps:
High-purity raw needle coke is provided, described raw needle coke is worn into fine powder, and subsequently by fine powder and binder pitch combination, gained mixture is worn into molding powder, molding powder is evenly molded as the shape required for graphite member, and further roasting, densification and graphitization processing are carried out to these parts, to prepare highly purified isotropic graphite.
Further, in above-mentioned steps, described coke fines end is 100:20 to 100:80 with pitch portfolio ratio, and is preferably every 100 parts of coke to 40-70 part binder pitch.
When being mixed with pitch at coke fines end, described pitch has been pre-heated to make it be transformed into low-viscosity (mobile) liquid, and this liquid is applicable to the uniform mixture preparing pitch and powdered coke.
Coke was heated in advance to the temperature raised, to improve gained uniformity of mixture before pitch is added in mixing.
Preferably, the particle size of the described molding powder that the mixture that described coke fines end and pitch combine is worn into is 75-150 micron.By needle coke being worn into the fine size relative to molding powder, the anisotropic properties for coke is compensated for further, thus generation does not almost have anisotropic high purity molding powder.
The invention has the beneficial effects as follows, high purity nuclear graphite inclusion-free still there is the isotropy of improvement and the graphite of controlled mean density and flexural strength, can be used for nuclear fission of new generation and excessive temperature reactor.
Embodiment
Below in conjunction with the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of high purity nuclear graphite preparation method, comprises the following steps:
(1) high-purity raw needle coke is provided, described raw needle coke is worn into fine powder;
(2) by fine powder and binder pitch combination, gained mixture is worn into molding powder, molding powder is evenly molded as the shape required for graphite member;
(3) further roasting, densification and graphitization processing are carried out to these parts, to prepare highly purified isotropic graphite.
Further, in above-mentioned steps, described coke fines end is 100:20 to 100:80 with pitch portfolio ratio, and is preferably every 100 parts of coke to 40-70 part binder pitch.
When being mixed with pitch at coke fines end, described pitch has been pre-heated to make it be transformed into low-viscosity (mobile) liquid, and this liquid is applicable to the uniform mixture preparing pitch and powdered coke.
Coke was heated in advance to the temperature raised, to improve gained uniformity of mixture before pitch is added in mixing.
Preferably, the particle size of the described molding powder that the mixture that described coke fines end and pitch combine is worn into is 75-150 micron.By needle coke being worn into the fine size relative to molding powder, the anisotropic properties for coke is compensated for further, thus generation does not almost have anisotropic high purity molding powder.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a high purity nuclear graphite preparation method, is characterized in that, comprises the following steps:
(1) high-purity raw needle coke is provided, described raw needle coke is worn into fine powder;
(2) by fine powder and binder pitch combination, gained mixture is worn into molding powder, molding powder is evenly molded as the shape required for graphite member;
(3) further roasting, densification and graphitization processing are carried out to these parts, to prepare highly purified isotropic graphite.
2. a kind of high purity nuclear graphite preparation method as claimed in claim 1, is characterized in that, in above-mentioned steps (2), described coke fines end is 100:20 to 100:80 with pitch portfolio ratio.
3. a kind of high purity nuclear graphite preparation method as claimed in claim 1, is characterized in that, the particle size of the described molding powder that the mixture that described coke fines end and pitch combine is worn into is 75-150 micron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410704891.9A CN104495799A (en) | 2014-11-27 | 2014-11-27 | Preparation method of high-purity nuclear graphite |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410704891.9A CN104495799A (en) | 2014-11-27 | 2014-11-27 | Preparation method of high-purity nuclear graphite |
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| CN104495799A true CN104495799A (en) | 2015-04-08 |
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| CN201410704891.9A Pending CN104495799A (en) | 2014-11-27 | 2014-11-27 | Preparation method of high-purity nuclear graphite |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107857261A (en) * | 2017-10-24 | 2018-03-30 | 大同新成新材料股份有限公司 | A kind of preparation method of nuclear graphite materials |
| CN111362698A (en) * | 2020-04-28 | 2020-07-03 | 湖南大学 | Novel isotropic nuclear-grade graphite material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101535178A (en) * | 2006-09-12 | 2009-09-16 | 格拉弗技术国际控股有限公司 | High purity nuclear graphite |
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2014
- 2014-11-27 CN CN201410704891.9A patent/CN104495799A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101535178A (en) * | 2006-09-12 | 2009-09-16 | 格拉弗技术国际控股有限公司 | High purity nuclear graphite |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107857261A (en) * | 2017-10-24 | 2018-03-30 | 大同新成新材料股份有限公司 | A kind of preparation method of nuclear graphite materials |
| CN111362698A (en) * | 2020-04-28 | 2020-07-03 | 湖南大学 | Novel isotropic nuclear-grade graphite material and preparation method thereof |
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Application publication date: 20150408 |