CN106082192A - Preparation method of artificial graphite powder for high-temperature gas cooled reactor nuclear fuel element and graphite powder - Google Patents
Preparation method of artificial graphite powder for high-temperature gas cooled reactor nuclear fuel element and graphite powder Download PDFInfo
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Abstract
The invention discloses a preparation method of an artificial stone ink powder for a high-temperature gas cooled reactor nuclear fuel element and graphite powder, wherein the preparation method specifically comprises the steps of mixing, isostatic pressing, densification treatment, grinding, shaping and grading treatment, graphitization and high-temperature purification.
Description
Technical field
The present invention is open relates to technical field prepared by graphite, particularly relates to a kind of HTGR nuclear fuel element employment
Make preparation method and the graphite powder of graphite powder.
Background technology
HTGR be Tsing-Hua University pass through independent research and success build forth generation nuclear reactor, have complete from
Main intellectual property.HTGR be forth generation efficiently, the mark heap-type of safe kernel reactor, with " pottery entirely " type coated particle
Fuel sphere is fuel element, using graphite as moderator and core structural material, using helium as coolant, has good consolidating
There is safety.
China is at Shidao Bay, Huaneng Group, the Shandong nuclear power station built, and total installed capacity amount is 10,000,000 KW, wherein HTGR 4,000,000
KW, this also indicates that forth generation HTGR formally enters commercialization.
HTGR nuclear fuel element production method is: fuel uranium is after carborundum is coated with (about 1mm), dispersed
In graphite matrix, make " graphite nodule " of diameter 60mm, referred to as nuclear fuel element.
Graphite substrate material, is mainly formed by phenolic aldehyde data bonding by graphous graphite powder and natural graphite powder, fires at core
In material element, its weight accounting reaches more than 90%, is one of the core material during nuclear fuel element is manufactured.
Owing to entering the Delanium that any material in nuclear reactor has very harsh condition, previous methods to prepare
Powder cannot meet the requirement of nuclear reactor, therefore, how to research and develop a kind of graphous graphite powder preparation side being applicable to HTGR
Method, becomes people's problem demanding prompt solution.
Summary of the invention
It is an object of the invention to the open preparation side that a kind of HTGR nuclear fuel element graphous graphite powder is provided
Method and graphite powder.
The technical scheme that the present invention provides, specifically, the system of a kind of HTGR nuclear fuel element graphous graphite powder
Preparation Method, it is characterised in that comprise the steps:
1) batch mixing: pitch coke and Colophonium are all put into agitating device, stirs 4～8 hours, obtains mixed material；
2) isostatic pressing: described mixed material is put into isostatic pressing machine, under the conditions of pressure is 150～180MPa,
Isostatic pressing 60～70 minutes；
3) densification: taken out by product after isostatic pressing, carry out densification, until the body of described product is close
Degree reaches 1.72g/cm3Above；
4) pulverizing: by product coarse crushing after densification, puts into Air Grinder and carries out broken pulverizing, obtain powder body, its
In, the mean diameter of described powder body is 35～45 μm；
5) shaping and staged care: put in shaping device by described powder body, removes burr Pedicellus et Pericarpium Trapae, shaping 8-10 minute
After, then by cyclone classified, remove particle diameter >=100 μm and the particle diameter powder body less than 5 μm, obtain uniform particle sizes's powder body, wherein, press
Weight meter, the particle size distribution of described uniform particle sizes's powder body be the powder content of particle diameter ＜ 100 μm be 100%, particle diameter ＜ 32 μm
Powder content is 60～70%；
6) graphitization and high temperature purification: described uniform particle sizes's powder body is put in crucible, after sealed process, puts into high temperature
Carry out in purification furnace heating up and purify, when the furnace temperature of described high temperature purification stove reaches 2000 DEG C, logical in described high temperature purification stove
Enter chlorine, when the furnace temperature of described high temperature purification stove reaches 2450 DEG C, in described high temperature purification stove, be passed through freon, when described
After the furnace temperature of high temperature purification stove reaches 3000 DEG C, high-temperature process 36～48 hours, then the graphite powder after high-temperature process is lowered the temperature,
Obtain graphite powder finished product.
Preferably, described step 1) burnt and Colophonium the weight proportion of medium pitch is 60～70:30～40.
Further preferably, described step 2) in described mixed material put into isostatic pressing machine particularly as follows: by described mixing
Material is put in gum cover, and after successively described gum cover is carried out evacuation and encapsulation process, puts into isostatic pressing machine.
Further preferably, described step 2) in described gum cover carried out evacuation and encapsulation process successively particularly as follows: by institute
State gum cover and carry out evacuation, when the vacuum in described gum cover reaches 0.07MPa, then carry out encapsulation process.
Further preferably, described step 1) the burnt true density ≮ 1.96g/cm of medium pitch3, ash ≯ 0.3%, fugitive constituent ≯
0.6%, water content ≯ 0.3%, sulfur content ≯ 0.2%.
Further preferably, described step 1) softening point of medium pitch is 120～140 DEG C, ash ≯ 0.3%, coking value ≮
55%, water content ≯ 5.0%, toluene insolubles content ≮ 28%, quinoline insolubles content are 8～14%.
Further preferably, described step 6) in the intake of chlorine be: epigranular powder body per ton is passed through 35～40kg
Chlorine.
Further preferably, described step 6) in the intake of freon be: epigranular powder body per ton is passed through 20～
The freon of 25kg.
Further preferably, described step 3) in densification include: repeatedly roasting and repeatedly impregnating；
Wherein, the maximum temperature of roasting is 900～1000 DEG C, and each roasting time is 600～700 hours；
The pressure of described dipping is 4MPa, and each dipping pressing time is 1～2 hour.
Present invention also offers a kind of HTGR nuclear fuel element graphous graphite powder, it is characterised in that described stone
Powdered ink is prepared from according to any one preparation method above-mentioned, and wherein, the mean diameter of described graphite is 35～45 μm, described stone
The particle diameter of powdered ink be distributed as particle diameter less than 100 μm content 100%, particle diameter less than 32 μm content 60～70%, described graphite powder
Total boron equivalent ＜ 1ppm, water content ＜ 0.06%, total ash ＜ 50ppm, specific surface are 1-2m2/ g, true density ≮ 2.18g/
cm3, degree of graphitization be ≮ 90%.
The preparation method of HTGR nuclear fuel element graphous graphite powder that the present invention provides, carry out successively batch mixing,
Isostatic pressing, densification, pulverizing, shaping and staged care and graphitization and high temperature purification step, wherein, at mill
Using Air Grinder to carry out pulverizing in powder step, the powder body particle mean size ground is 35～45 μm, carries out again after pulverizing step
Shaping step, removes the burr Pedicellus et Pericarpium Trapae of powder body, and the shape making powder body is all close to circular or oval, then revolved
Wind classification, eliminates larger particles and subparticle, and the distribution of the most whole powder granularity is more uniform, and apparent density is bigger, with
Time in graphitization and high temperature purification step, be filled with chlorine and freon, on the one hand injecting of two kinds of gases reduces the total of product
Ash, makes product total ash less than 50ppm, improves corrosion resistance and the radiation resistance performance of product, on the other hand be used for inhaling
Receive boron element, make total boron equivalent less than 1ppm, owing to boron element can absorb neutron in nuclear reactor in a large number, cause reaction chain to stop
Only, the total boron equivalent in graphite to be reduced；Graphite powder after above-mentioned steps processes, uses it to carry out nuclear fuel element
During engineer testing, it is all circular or oval shape due to graphite powder, and granule size is reasonably distributed, the core combustion of compacting
Material element, inside will not form hole because of bridging phenomenon, and the density of fuel particle is big, and intensity is high, and good stability, at reactor
In service life long.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet the enforcement of the present invention
Example, and for explaining the principle of the present invention together with description.
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The preparation of a kind of HTGR nuclear fuel element graphous graphite powder that Fig. 1 provides for the open embodiment of the present invention
Step 5 in method) in the scanning electron microscope (SEM) photograph of powder body before shaping；
The preparation of a kind of HTGR nuclear fuel element graphous graphite powder that Fig. 2 provides for the open embodiment of the present invention
Step 5 in method) in the scanning electron microscope (SEM) photograph of powder body after shaping.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but is not limited to this
Bright protection domain.
When graphous graphite powder in order to solve to use traditional method to prepare in the past carries out nuclear fuel element engineer testing, exist
Ftractureing in fuel element roasting process, comprcssive strength is inadequate, and corrosion resistance is poor, and the problem such as wear no resistance, the present embodiment offer
A kind of preparation method of HTGR nuclear fuel element graphous graphite powder, concrete preparation process is as follows:
1) batch mixing: pitch coke and Colophonium are all put into agitating device, stirs 4～8 hours, obtains mixed material；
2) isostatic pressing: described mixed material is put into isostatic pressing machine, under the conditions of pressure is 150～180MPa,
Hydrostatic profile 60～70 minutes；
3) densification: taken out by product after isostatic pressing, carry out densification, until the body of described product is close
Degree reaches 1.72g/cm3Above；
4) pulverizing: by product coarse crushing after densification, puts into Air Grinder and carries out broken pulverizing, obtain powder body, its
In, the mean diameter of described powder body is 35～45 μm；
5) shaping and staged care: put in shaping device by described powder body, removes burr Pedicellus et Pericarpium Trapae, shaping 8～10 minutes
After, by cyclone classified, remove particle diameter >=100 μm and the particle diameter powder body less than 5 μm, obtain uniform particle sizes's powder body, wherein, by weight
Gauge, the particle size distribution of described uniform particle sizes's powder body be the powder content of particle diameter ＜ 100 μm be 100%, the powder of particle diameter ＜ 32 μm
Body burden is 60～70%；
6) graphitization and high temperature purification: described uniform particle sizes's powder body is put in crucible, after sealed process, puts into high temperature
Carry out in purification furnace heating up and purify, when the furnace temperature of described high temperature purification stove reaches 2000 DEG C, logical in described high temperature purification stove
Enter chlorine, when the furnace temperature of described high temperature purification stove reaches 2450 DEG C, in described high temperature purification stove, be passed through freon, when described
After the furnace temperature of high temperature purification stove reaches 3000 DEG C, high-temperature process 36～48 hours, then the graphite powder after high-temperature process is lowered the temperature,
Obtain graphite powder finished product.
Wherein, in step 4) milling process in, use Air Grinder to carry out broken pulverizing, the broken of powder body can be improved
Degree, reduces the mean diameter of powder body, reduces the participating in of impurity, then matching step 5) in shaping and staged care, by powder
Burr Pedicellus et Pericarpium Trapae in body is all removed, and makes powder body rounded or oval, wherein the micro-structure diagram of powder body before shaping and after shaping
Fig. 1 and Fig. 2 can be seen respectively, the most again the powder body after shaping is carried out cyclone classified, remove big particle diameter powder body and small particle powder
Body, improves the uniformity of whole powder granularity distribution, and wherein the powder content of particle diameter ＜ 100 μm is 100%, particle diameter ＜ 32 μm
Powder content is 60～65%, increases apparent density, when carrying out nuclear fuel element engineer testing, and the nuclear fuel unit of compacting
Will not form hole because of bridging phenomenon inside part, the density of fuel element is big, and intensity is high, and good stability, in reactor
Service life is long.
And step 6) graphitization and high temperature purification during, be passed through chlorine when furnace temperature reaches 2000 DEG C, reach in furnace temperature
Being passed through freon during to 2450 DEG C, wherein, the Main Function that is passed through of freon is to reduce the total boron equivalent in graphite powder.
Wherein, step 1) burnt and Colophonium the weight proportion of medium pitch is 60～70:30～40, enables Colophonium to be coated with completely
After particle surface, molding and carbonization, forming the strongest carbon-carbon bond, make product strength higher, compactness is more preferable.
Step 2) in mixed material is put into isostatic pressing machine particularly as follows: put in gum cover by mixed material, and by gum cover
After carrying out evacuation and encapsulation process successively, put into isostatic pressing machine, it is preferable that gum cover is carried out evacuation, true when in gum cover
When reciprocal of duty cycle reaches 0.07MPa, then carry out encapsulation process；Wherein, evacuation be avoid isostatic pressed during, gum cover gas is too much,
Burst；Isostatic pressing main purpose is: make product have the size of each performance to same tropism, i.e. product and product
Direction is unrelated；Load gum cover, isostatic pressed hydraulic oil can be avoided to enter interiors of products.
In order to improve the graphite powder end properties prepared in the present embodiment, in pitch coke and the material choice of Colophonium
In, it is preferable that the true density ≮ 1.96g/cm of pitch coke3, ash ≯ 0.3%, fugitive constituent ≯ 0.6%, water content ≯ 0.3%,
Sulfur content ≯ 0.2%；The softening point of Colophonium is 120～140 DEG C, ash ≯ 0.3%, coking value ≮ 55%, water content ≯
5.0%, toluene insolubles content ≮ 28%, quinoline insolubles content are 8～14%.
Step 6) in the intake of chlorine be: epigranular powder body per ton is passed through the chlorine of 35～40kg；Freon
Intake is: be passed through the freon of 20～25kg in epigranular powder body per ton；Wherein, the effect of chlorine and freon is:
1, reduce the total ash of product, make product total ash less than 50ppm, improve corrosion resistance and the radiation resistance performance of product；
2, absorb boron element, make total boron equivalent less than 1ppm, because boron element can absorb neutron in nuclear reactor in a large number, cause reaction
Chain stops, the total boron equivalent in graphite to be reduced.
Step 3) in densification include: repeatedly roasting and repeatedly impregnating；
Wherein, the maximum temperature of roasting is 900～1000 DEG C, and each roasting time is 600～700 hours；
The pressure of described dipping is 4MPa, and each dipping pressing time is 1～2 hour；
This densification is specially and first carries out roasting, then impregnates, infusion product carries out roasting again, with secondary past
It is multiple until product meets the requirements.
Present embodiment provides a kind of HTGR nuclear fuel element graphous graphite powder, this graphite powder is according to upper
Stating any one preparation method to be prepared from, wherein, the mean diameter of graphite is that 35～45 μm, the particle diameter of graphite powder are distributed as grain
Footpath less than 100 μ content 100%, particle diameter less than 32 μ content 60～70%, total boron equivalent ＜ 1ppm of described graphite powder, moisture content contains
Amount ＜ 0.06%, total ash ＜ 50ppm, specific surface are 1-2m2/ g, true density ≮ 2.18g/cm3, degree of graphitization be ≮ 90%.
In above example, indicating if the most special, described content is weight content.
Compare with specific embodiment and comparative example below, closer the present invention is explained.
Embodiment 1:
A kind of preparation method of HTGR nuclear fuel element graphous graphite powder, concrete preparation process is as follows:
1) batch mixing: 60 weight portion pitch cokes and 40 weight portion Colophoniumes are all put into agitating device, stirs 4～8 hours,
Mixed material, wherein, the true density ≮ 1.96g/cm of pitch coke3, ash ≯ 0.3%, fugitive constituent ≯ 0.6%, water content ≯
0.3%, sulfur content ≯ 0.2%；The softening point of Colophonium is 120～140 DEG C, ash ≯ 0.3%, coking value ≮ 55%, moisture content contain
Amount ≯ 5.0%, toluene insolubles content ≮ 28%, quinoline insolubles content are 8～14%；
2) isostatic pressing: put into by mixed material in gum cover, carries out evacuation to gum cover, when in gum cover, vacuum reaches
During 0.07MPa, after gum cover is carried out encapsulation process, put into isostatic pressing machine, under the conditions of pressure is 150～180MPa, static pressure
Molding 60～70 minutes；
3) densification: taken out by product after isostatic pressing, carries out high-temperature roasting 600～700 hours, wherein, institute
The maximum temperature stating high-temperature roasting is 900～1000 DEG C, is impregnated by product after roasting under the conditions of dipping pressure is 4MPa
Pressurized treatments 1～2 hours, carry out roasting again by product after dipping, reciprocal with this, until product body density reaches 1.72g/cm3
Above；4) pulverizing: by product coarse crushing after densification, puts into Air Grinder and carries out broken pulverizing, obtain powder body, wherein,
The mean diameter of described powder body is 35～45 μm；
5) shaping and staged care: put into by powder body in shaping device, removes burr Pedicellus et Pericarpium Trapae, after shaping 8-10 minute, logical
Cross cyclone classified, remove particle diameter >=100 μm and the particle diameter powder body less than 5 μm, obtain uniform particle sizes's powder body, wherein, by weight,
The particle size distribution of described uniform particle sizes's powder body be the powder content of particle diameter ＜ 100 μm be 100%, particle diameter ＜ in uniform particle sizes's powder body
The powder content of 32 μm is 60～70%；
6) graphitization and high temperature purification: put in crucible by uniform particle sizes's powder body, after sealed process, puts into high temperature purification
Carry out in stove heating up and purify, when the furnace temperature of described high temperature purification stove reaches 2000 DEG C, in described high temperature purification stove, be passed through chlorine
Gas, it is passed through the chlorine for being passed through 35～40kg in epigranular powder body per ton, when the furnace temperature of high temperature purification stove reaches 2450 DEG C
Time, in described high temperature purification stove, be passed through freon, its intake be epigranular powder body per ton is passed through 20～25kg fluorine
Leon, after the furnace temperature of described high temperature purification stove reaches 3000 DEG C, high-temperature process 36～48 hours, prepare graphite powder finished product.
Embodiment 2
The present embodiment difference from Example 1 is: step 1) in put into the weight of agitating device pitch coke and Colophonium
Amount proportioning is 70:30, and other steps are consistent.
Comparative example 1
This comparative example is with the difference of embodiment 1: in step 4) pulverizing step in, by the mean diameter of powder body
Control in 25～30 μm, simultaneously steps 5) in after shaping and staged care diameter of particle be distributed as the powder content of particle diameter ＜ 32 μm
Being 75～80%, other batch mixing, isostatic pressing, densification and graphitization and high temperature purification step are the most consistent.
Comparative example 2
This comparative example difference from Example 1 is: do not carry out step 5) in shaping and staged care, other mixed
Material, isostatic pressing, densification, pulverizing and graphitization and high temperature purification step are the most consistent.
Comparative example 3
This comparative example is with the difference of embodiment 1: step 6) in graphitization and high temperature purification step be general
The graphitization technique of graphite electrode, product is directly warming up to 2700 DEG C by energising, and obstructed chlorine and freon are purified, then
Power-off and cooling obtain product, and other batch mixing, isostatic pressing, densification, pulverizing and shaping and classification step are equal
Unanimously.
Embodiment 3
Graphite powder in embodiment 1, embodiment 2, comparative example 1, comparative example 2 and comparative example 3 is carried out performance detection, tool
Body is shown in Table 1.
Table 1:
| Sequence number | Analysis project | Implement 1 | Implement 2 | Contrast 1 | Contrast 2 | Contrast 3 |
| 1 | Laser particle size D50 | 43μm | 42μm | 27μm | 44μm | 42μm |
| 2 | Total boron equivalent | 0.5ppm | 0.7ppm | 0.6ppm | 0.5ppm | 95ppm |
| 3 | Moisture content | 0.06% | 0.04% | 0.08% | 0.07% | 0.06% |
| 4 | Total ash | 13ppm | 26ppm | 20ppm | 30ppm | 600ppm |
| 5 | Mechanical picker ＜ 100 | 100% | 100% | 100% | 100% | 100% |
| 6 | Mechanical picker ＜ 32 μ | 63% | 62% | 76% | 60% | 62% |
| 7 | Specific surface | 1.2m<sup>2</sup>/g | 1.6m<sup>2</sup>/g | 2.1m<sup>2</sup>/g | 2.5m<sup>2</sup>/g | 1.3m<sup>2</sup>/g |
| 8 | True density | 2.19g/cm<sup>3</sup> | 2.18g/cm<sup>3</sup> | 2.18g/cm<sup>3</sup> | 2.17g/cm<sup>3</sup> | 2.15g/cm<sup>3</sup> |
| 9 | Apparent density | 1.0g/cm<sup>3</sup> | 0.95g/cm<sup>3</sup> | 0.82g/cm<sup>3</sup> | 0.65g/cm<sup>3</sup> | 1.0g/cm<sup>3</sup> |
| 10 | Degree of graphitization | 92% | 90% | 93% | 91% | 78% |
Wherein, in table 1, font-weight part represents Indexes Abnormality, because reducing in Delanium powder, preparation method thereof or changing
After becoming a preparation process, the performance indications of graphous graphite powder occur in that change.
Embodiment 4
Use the graphite powder in embodiment 1, embodiment 2, comparative example 1, comparative example 2, comparative example 3 respectively, according to nuclear fuel
The production method of element, (natural graphite powder and phenolic resin all can reach core to add identical natural graphite powder and phenolic resin
Pure rank), through mediating, pelletize, it is dried, pulverizing and homogenization, obtains the matrix powder for producing nuclear fuel element ball, finally
Add uranium fuel granule and carry out ball press technique detection, finally the nuclear fuel element produced is detected, concrete testing result
It is shown in Table 2.
Table 2
Wherein, in table 2, font-weight part represents Indexes Abnormality, because reducing in Delanium powder, preparation method thereof or changing
After becoming a preparation process, cause the nuclear fuel element performance indications produced to occur in that change, do not meet the combustion of high temperature gas-cooled core
The requirement of material element.
Those skilled in the art, after considering description and putting into practice invention disclosed herein, will readily occur to its of the present invention
Its embodiment.The application is intended to any modification, purposes or the adaptations of the present invention, these modification, purposes or
Person's adaptations is followed the general principle of the present invention and includes the undocumented common knowledge in the art of the present invention
Or conventional techniques means.Description and embodiments is considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
Claims (10)
1. the preparation method of a HTGR nuclear fuel element graphous graphite powder, it is characterised in that comprise the steps:
1) batch mixing: pitch coke and Colophonium are all put into agitating device, stirs 4～8 hours, obtains mixed material；
2) isostatic pressing: described mixed material is put into isostatic pressing machine, under the conditions of pressure is 150～180MPa, waits quiet
Molded 60～70 minutes；
3) densification: taken out by product after isostatic pressing, carry out densification, until the body density of described product reaches
To 1.72g/cm3Above；
4) pulverizing: by product coarse crushing after densification, puts into Air Grinder and carries out broken pulverizing, obtain powder body, wherein, and institute
The mean diameter stating powder body is 35～45 μm；
5) shaping and staged care: put in shaping device by described powder body, removes burr Pedicellus et Pericarpium Trapae, after shaping 8-10 minute, logical
Cross cyclone classified, remove particle diameter >=100 μm and the powder body of particle diameter ＜ 5 μm, obtain uniform particle sizes's powder body, wherein, by weight, institute
The powder content that particle size distribution is particle diameter ＜ 100 μm stating uniform particle sizes's powder body is 100%, and the powder content of particle diameter ＜ 32 μm is
60～70%；
6) graphitization and high temperature purification: described uniform particle sizes's powder body is put in crucible, after sealed process, puts into high temperature purification
Carry out in stove heating up and purify, when the furnace temperature of described high temperature purification stove reaches 2000 DEG C, in described high temperature purification stove, be passed through chlorine
Gas, when the furnace temperature of described high temperature purification stove reaches 2450 DEG C, is passed through freon, when described high temperature in described high temperature purification stove
After the furnace temperature of purification furnace reaches 3000 DEG C, high-temperature process 36～48 hours, then lower the temperature the graphite powder after high-temperature process, obtain stone
Powdered ink finished product.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 1, it is characterised in that
Described step 1) burnt and Colophonium the weight proportion of medium pitch is 60～70:30～40.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 1, it is characterised in that
Described step 2) in described mixed material is put into isostatic pressing machine particularly as follows: put in gum cover by described mixed material, and will
After described gum cover carries out evacuation and encapsulation process successively, put into isostatic pressing machine.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 3, it is characterised in that
Described step 2) in described gum cover is carried out evacuation and encapsulation process successively particularly as follows: described gum cover is carried out evacuation, when
When vacuum in described gum cover reaches 0.07MPa, then carry out encapsulation process.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 1, it is characterised in that
Described step 1) the burnt true density ≮ 1.96g/cm of medium pitch3, ash ≯ 0.3%, fugitive constituent ≯ 0.6%, water content ≯
0.3%, sulfur content ≯ 0.2%.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 1, it is characterised in that
Described step 1) softening point of medium pitch is 120～140 DEG C, ash ≯ 0.3%, coking value ≮ 55%, water content ≯
5.0%, toluene insolubles content ≮ 28%, quinoline insolubles content are 8～14%.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 1, it is characterised in that
Described step 6) in the intake of chlorine be: epigranular powder body per ton is passed through the chlorine of 35～40kg.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 1, it is characterised in that
Described step 6) in the intake of freon be: epigranular powder body per ton is passed through the freon of 20～25kg.
The preparation method of HTGR nuclear fuel element graphous graphite powder the most according to claim 1, it is characterised in that
Described step 3) in densification include: repeatedly roasting and repeatedly impregnating；
Wherein, the maximum temperature of roasting is 900～1000 DEG C, and each roasting time is 600～700 hours；
The pressure of described dipping is 4MPa, and each dipping pressing time is 1～2 hour.
10. a HTGR nuclear fuel element graphous graphite powder, it is characterised in that described graphite powder is according to aforesaid right
Requiring that in 1～9, any one preparation method is prepared from, wherein, the mean diameter of described graphite is 35～45 μm, and particle diameter is distributed
For particle diameter less than 100 μm content 100%, particle diameter less than 32 μm content 60～70%, total boron equivalent is ＜ 1ppm, water content ＜
0.06%, total ash ＜ 50ppm, specific surface are 1-2m2/ g, true density ≮ 2.18g/cm3, degree of graphitization be ≮ 90%.
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