CN108787131A - A kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder - Google Patents
A kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder Download PDFInfo
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- CN108787131A CN108787131A CN201810556264.3A CN201810556264A CN108787131A CN 108787131 A CN108787131 A CN 108787131A CN 201810556264 A CN201810556264 A CN 201810556264A CN 108787131 A CN108787131 A CN 108787131A
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- fuel element
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/28—Shape or construction of beater elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
Abstract
The present invention relates to artificial graphite production technical field more particularly to a kind of milling methods of high temperature gas cooled reactor nuclear fuel element graphous graphite powder, including primary comminution, coarse grinding treatment and fine grinding shaping, graphous graphite powder raw material to obtain raw materials particles after crushing；Fine grinding processing and primary shaping are carried out to powder granule in a manner of pivoting friction again after raw materials particles are crushed, so as to get powder particle size refinement and be in near-spherical；Powder is driven to screen the powder that output obtains standard index through grader through ascending air again；By by the integration of powder fine grinding and shaping, in conjunction with raw material corase grinding and fine grinding reforming process in respectively to the FREQUENCY CONTROL of its host, wind turbine and grader, realize that powder index accurately controls, solve it is existing in the prior art because the powder index of graphous graphite powder can not accurately control cause high standard nuclear fuel element to be difficult to realize batch production the technical issues of.
Description
Technical field
The present invention relates to artificial graphite production technical field more particularly to a kind of high temperature gas cooled reactor nuclear fuel elements with artificial
The milling method of graphite powder.
Background technology
High temperature gas cooled reactor nuclear fuel element production method is：Fuel uranium after silicon carbide coats (1mm or so), it is evenly dispersed
In graphite matrix, " graphite nodule " of diameter 60mm, referred to as nuclear fuel element is made；Graphite substrate material, mainly by artificial stone
Ink powder and natural graphite powder are bonded by phenolic aldehyde data, and in nuclear fuel element, weight accounting is core up to 90% or more
One of core material during the fuel element manufacturing；It is very harsh due to having into any material in nuclear reactor
Condition requirement, the intensity of nuclear fuel element, wearability are required by it stringent.
Chinese Patent Application No. is：High temperature gas cooled reactor nuclear fuel element artificial graphite disclosed in 2016104144468
The preparation method and graphite powder of powder, it is specially batch mixing, isostatic pressing, densification, milling, shaping to disclose preparation method
And classification is handled and is graphitized and high temperature purification step, and nuclear fuel element is carried out by the graphite powder that this method is prepared
When engineer testing, since graphite powder is all the shape of round or ellipse, and granule size is reasonably distributed, and core made of compacting fires
Expect that element, inside will not form hole because of bridging phenomenon, the density of fuel particle is big, and intensity is high, and stability is good, in reactor
In service life it is long.
In the above-mentioned technical solutions, it by after material coarse cutting, is milled through airflow milling, then reshaping is handled；Its gained
Powder particle size it is uncontrollable simultaneously, shaped machine carries out shaping again after being milled by airflow milling, it is well known that in reforming process
The friction between powder and setting is equally existed, and it is uncontrollable, therefore the powder after airflow milling and the powder after shaping to wear
Expect while index difference and be difficult to control, leads to that the nuclear fuel element production of high standard is difficult to meet.
Invention content
The purpose of the present invention is in view of the deficiencies of the prior art, provide a kind of high temperature gas cooled reactor nuclear fuel element employment
The milling method for making graphite powder, by by the integration of powder fine grinding and shaping, in conjunction in raw material corase grinding and fine grinding reforming process
Respectively to the FREQUENCY CONTROL of its host, wind turbine and grader, realizes accurately controlling for powder index, solve to exist in the prior art
Because the powder index of graphous graphite powder can not accurately control cause high standard nuclear fuel element be difficult to realize batch production
Technical problem.
In order to solve the above technical problems, the present invention provides a kind of high temperature gas cooled reactor nuclear fuel element graphous graphite powders
Milling method, which is characterized in that include the following steps：
(a) graphous graphite powder raw material are put into jaw crusher by primary comminution, are obtained grain size after crushing and are less than
The raw materials particles of 20mm；
(b) raw materials particles obtained in the step (a) are sent into 3R raymond mills and are rolled by coarse grinding treatment
It is broken, by controlling the operating frequency of 3R raymond mill upper fan a and grader a, obtain the powder of 150-200 μm of grain size
Grain；
(c) powder granule obtained by the step (b) is sent into mechanical flour mill, is milled by machinery by fine grinding shaping
Turntable in machine on host carries out fine grinding processing and primary shaping to relatively rotate friction mode with gear ring to the powder granule,
And the two level shaping of powder is realized in the collision of multiple tups through being arranged on turntable and powder granule, so as to get powder particle size
32-100 μm and shape are in near-spherical；The ascending air that wind turbine frequency makes the powder after two level shaping in its generation is controlled simultaneously
Under effect the powder that output obtains standard index, 32-100 μm of the powder particle size of the standard index are screened through grader.
Wherein, the turntable will fall within powder granule thereon and be thrown away between turntable and gear ring with rotating centrifugation
It is milled in area, powder granule is moved to institute while carrying out fine grinding processing to powder granule by the relative motion of turntable and gear ring
During stating milling area, powder granule is contacted with gear ring in a manner of impacting, and realizes primary shaping of the gear ring to powder granule.
In addition, the powder that the powder granule is formed through turntable and gear ring fine grinding, is formed through the rotation of driven by rotary disc tup
Vortical flow drive powder to pass through the movement locus of the tup and by during mobile within outer, through tup with the side of collision
Formula carries out two level shaping to the powder being in contact with it.
Specifically, after the powder two level shaping, the ascending air that is formed in a manner of negative-pressure adsorption through wind turbine is by whirlpool gas
Powder absorption in stream moves up, and after the grader filtering screening, is driven and is exported by ascending air.
As an improvement, further including two level milling, the powder forms fine powder material and coarse powder material after grader filtering screening,
The fine powder material drives through ascending air and is exported after grader；The coarse powder material through grader with rotating manner by coarse powder material with
Free-falling after fine powder material separation is in contact with the powder granule thrown away through turntable centrifugation, is driven by the powder granule and enter mill
Powder area carries out secondary milling.
As an improvement, the raw material are coke, and content of ashes≤0.7% in coke, sulfur content≤0.8%, moisture
≤ 0.5%, bulk density >=1.6g/cm3, the μ Ω m of resistivity≤100.
As an improvement, when the 3R raymond mills carry out coarse grinding treatment to raw materials particles, wind turbine thereon and classification
Unit frequency is controlled respectively between 30-45HZ and 30-40HZ.
As an improvement, it is described machinery flour mill during carrying out raw materials particles fine grinding, host operating frequency thereon
For 40-50HZ, wind turbine frequency is 30-45HZ, and classification unit frequency is 20-40HZ.
As an improvement, it is 32 μm that the specification of the powder, which includes target particle size, the percent of pass across the grader is
65-75%；Target particle size is 63 μm, and it is 92-98% to pass through the percent of pass of the grader；Target particle size is 80 μm, is worn
The percent of pass for crossing the grader is 96-98%；Target particle size is 80 μm, and it is 98- to pass through the percent of pass of the grader
100%.
Beneficial effects of the present invention：
(1) it is produced, is realized to standard index by 3R raymond mills and the cooperation of mechanical flour mill in the present invention
Graphous graphite powder powder accurately controls, and is powder in conjunction with the control of wind turbine a in 3R raymond mills and grader a frequencies
Grain standard uniformly produces, the FREQUENCY CONTROL of host, wind turbine and grader in cooperative mechanical flour mill, enabling production standard refers to
While marking graphous graphite powder powder, production efficiency and controlling greatly improve, and solve existing in the prior art because of artificial stone
The technical issues of powder index of ink powder can not accurately control and high standard nuclear fuel element is caused to be difficult to realize batch production.
(2) in the present invention by by the fine grinding of powder in traditional handicraft and orthopedic implant integration optimization, realize fine grinding process with
Powder after fine grinding is formed by whirlpool by the synchronous operation of trimming in conjunction in turntable upper ram operation process through its rotation
Air-flow is shifted through wind turbine after being collected and is exported, and collection control of the vortical flow to powder particles is controlled by host rotational frequency
System, while so that qualified powder is automatically separated with powder, realization accurately controls powder index.
(3) keep powder fine grinding multiple with tup in the process by the setting of the special construction of tup and turntable in the present invention
Contact -impact makes to carry out corner angle removal while powder fine grinding, and it is in spherical to make powder granule, to reduce graphous graphite powder
The bridge formation of grain part is linear, improves apparent density, the density and intensity of nuclear fuel element is improved, in conjunction with tup to rotate drive manner
Generated vortical flow passes through the control of the operating frequency control realization powder index to host to the absorptive collection of tiny powder
System.
In conclusion the present invention has many advantages, such as that mechanism is reasonable, production is stablized and powder norm controlling is accurate；More particularly to
A kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder.
Description of the drawings
For the clearer technical solution for illustrating the embodiment of the present invention, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings discussed below is only some embodiments of the present invention, for ability
For the those of ordinary skill in domain, without creative efforts, it is attached to can also be obtained according to these attached drawings other
Figure.
Fig. 1 is the method for the present invention flow chart；
Fig. 2 is conventional artificial's graphite powder SEM electron-microscope scanning figures；
The produced artificial graphite powder SEM electron-microscope scanning figures of Fig. 3 present invention；
Fig. 4 is overall structure of the present invention；
Fig. 5 is mechanical flour mill partial sectional view in the present invention；
Fig. 6 is that A-A trusts sectional view in Fig. 5；
Fig. 7 is one of state diagram in the embodiment of the present invention seven；
Fig. 8 is two of state diagram in the embodiment of the present invention seven；
Fig. 9 is grader schematic cross-sectional view.
Specific implementation mode
Technical solution in the embodiment of the present invention is clearly and completely illustrated below in conjunction with the accompanying drawings.
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Embodiment one
A kind of high temperature gas cooled reactor nuclear fuel element graphous graphite powder in the present embodiment is described according to Figure of description Fig. 1
Milling method.
A kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder, includes the following steps：
(a) graphous graphite powder raw material are put into jaw crusher by primary comminution, are obtained grain size after crushing and are less than
The raw materials particles of 20mm；
(b) raw materials particles obtained in the step (a) are sent into 3R raymond mills and are rolled by coarse grinding treatment
It is broken, it is 30-45HZ by controlling 3R raymond mill upper fan a frequencies, the operating frequency of grader a is 30-40HZ, is obtained
The powder granule of 150-200 μm of grain size；In the present embodiment, the raw materials particles obtained after jaw crushing crusher machine are boosted
Machine, which is promoted, to be sent into 3R raymond mills；
(c) powder granule obtained by the step (b) is sent into mechanical flour mill, is milled by machinery by fine grinding shaping
Host carries out the powder granule with relatively rotating friction mode with gear ring with the frequency band turn disk rotation of 40-50HZ in machine
Fine grinding handles and primary shaping, and the collision of multiple tups through being arranged on turntable and powder granule realizes that the two level of powder is whole
Shape, so as to get 32-100 μm of powder particle size and shape be in near-spherical；Simultaneously control wind turbine rotational frequency be 30-45HZ, make through
Powder after two level shaping obtains under the ascending air effect of its generation through the grader screening output that rotational frequency is 20-40HZ
Obtain the powder of standard index, 32-100 μm of the powder particle size of the standard index.
Wherein, the turntable will fall within powder granule thereon and be thrown away between turntable and gear ring with rotating centrifugation
It is milled in area, powder granule is moved to institute while carrying out fine grinding processing to powder granule by the relative motion of turntable and gear ring
During stating milling area, powder granule is contacted with gear ring in a manner of impacting, and realizes primary shaping of the gear ring to powder granule.
In addition, the powder that the powder granule is formed through turntable and gear ring fine grinding, is formed through the rotation of driven by rotary disc tup
Vortical flow drive powder to pass through the movement locus of the tup and by during mobile within outer, through tup with the side of collision
Formula carries out two level shaping to the powder being in contact with it.
It should be noted that for nuclear fuel element
Specifically, after the powder two level shaping, the ascending air that is formed in a manner of negative-pressure adsorption through wind turbine is by whirlpool gas
Powder absorption in stream moves up, and after the grader filtering screening, is driven and is exported by ascending air.
Further, further include that two level is milled, the powder forms fine powder material and coarse powder material after grader filtering screening,
The fine powder material drives through ascending air and is exported after grader；The coarse powder material through grader with rotating manner by coarse powder material with
Free-falling after fine powder material separation is in contact with the powder granule thrown away through turntable centrifugation, is driven by the powder granule and enter mill
Powder area carries out secondary milling.
Further, the raw material are coke, content of ashes≤0.7% in coke, sulfur content≤0.8%, moisture
≤ 0.5%, bulk density >=1.6g/cm3, the μ Ω m of resistivity≤100.
As shown in Figures 2 and 3, conventional artificial's graphite powder is swept with the produced artificial graphite powder of the present invention by SEM Electronic Speculum
Tracing.
Embodiment two
Wherein identical with embodiment one or corresponding component uses reference numeral corresponding with embodiment one, is risen to be easy
See, hereafter only describes the distinctive points with embodiment one；The embodiment two and embodiment one the difference is that：Selection coke refers to
It is designated as：Ash content 0.5%, sulfur 0.6%, moisture content 0.2%, bulk density 1.63g/cm3, the graphous graphite powder of 90 μ Ω m of resistivity
Raw material, the raw materials particles after being crushed less than 20mm are sent into 3R raymond mills, by three grinding rollers in it to turn
It is 30HZ by controlling wind turbine rotational frequency respectively, grader turns after the mode that rolls is moved to raw materials particles progress break process
Dynamic frequency is to detach output after being formed by powder granule screening of the grain size less than 150 μm after 30HZ will be crushed；Turned by 30HZ
The wind turbine of dynamic frequency carries out powder and detaches, and powder granule of the adsorption gas flow generated through wind turbine rotation to grain size less than 150 μm is inhaled
It is attached to detach, specifically, the powder granule of corrresponding quality is effectively adsorbed according to adsorption capacity caused by adsorption gas flow defeated
Go out, summarized through the multiple test in production process, when wind turbine frequency is 30HZ, the adsorption capacity generated can be less than grain size
150 μm of powder effectively shifts, and rotates screening in conjunction with the grader that frequency is 30HZ, powder of the grain size less than 150 μm is made to filter
While screening, larger powder granule do not influence qualified powder by efficiency, realize and be less than 150 μm of powder to target particle size
High efficiency screening output, ensure to accurately control diameter of particle index while improving production efficiency, while by powder
The restriction of index tinyization improves the production efficiency during follow-up powder fine grinding.
Embodiment three
Wherein identical with embodiment two or corresponding component uses reference numeral corresponding with embodiment one, is risen to be easy
See, hereafter only describes the distinctive points with embodiment two；The embodiment three and embodiment two the difference is that：Selection coke refers to
It is designated as：Ash content 0.3%, sulfur 0.7%, moisture content 0.1%, bulk density 1.66g/cm3, the graphous graphite powder of 50 μ Ω m of resistivity
Raw material, the raw materials particles after being crushed less than 20mm are sent into 3R raymond mills, by three grinding rollers in it to turn
It is 45HZ by controlling wind turbine rotational frequency respectively, grader turns after the mode that rolls is moved to raw materials particles progress break process
Dynamic frequency is to detach output after being formed by powder granule screening of the grain size less than 200 μm after 40HZ will be crushed；In the present embodiment
In, effective absorption output is carried out to the powder granule of corrresponding quality according to adsorption capacity caused by adsorption gas flow, through producing
Multiple test in journey is summarized, and when wind turbine frequency is 45HZ, the powder that the adsorption capacity of generation can be less than 200 μm to grain size has
Effect transfer rotates screening in conjunction with frequency for the grader of 40HZ, while so that powder filtering of the grain size less than 200 μm is sieved, compared with
Big powder granule do not influence qualified powder by efficiency, realize defeated less than the high efficiency screening of 200 μm of powder to target particle size
Go out, ensures to accurately control diameter of particle index while improving production efficiency.
Example IV
Wherein identical with embodiment two and three or corresponding component use with embodiment two and three corresponding reference numerals,
For simplicity, the distinctive points with embodiment two and three are hereafter only described；The example IV and embodiment two and three it is different it
Be in：The machinery flour mill is 40HZ in the operating frequency for carrying out raw materials particles fine grinding process host, and wind turbine frequency is
30HZ, classification unit frequency are 20HZ, can get the powder that graphous graphite powder powder index is 32 μm, percent of pass 66.3%；
The powder that powder index is 63 μm, percent of pass 93.5%；The powder that powder index is 80 μm, percent of pass 96.5%；
The powder that powder index is 100 μm, percent of pass 98.3%；Different by different artificial graphites require to select corresponding powder
Material index makes artificial graphite meet its compactness, intensity and wearability by being accurately controlled to graphous graphite powder powder index
Under the premise of, improve its production efficiency.
Embodiment five
Wherein identical with example IV or corresponding component uses reference numeral corresponding with example IV, is risen to be easy
See, hereafter only describes the distinctive points with example IV；The embodiment five and example IV the difference is that：The machinery mill
Powder machine is 45HZ in the operating frequency for carrying out raw materials particles fine grinding process host, and wind turbine frequency is 35HZ, and classification unit frequency is
30HZ can get the powder that graphous graphite powder powder index is 32 μm, percent of pass 70.5%；The powder that powder index is 63 μm
Material, percent of pass 95.3%；The powder that powder index is 80 μm, percent of pass 96.6%；The powder that powder index is 100 μm
Material, percent of pass 98.5%；Different by different artificial graphites require to select corresponding powder index, by artificial stone
Ink powder powder index accurately controls, and under the premise of so that artificial graphite is met its compactness, intensity and wearability, improves its production
Efficiency.
Embodiment six
Wherein identical with embodiment five or corresponding component uses reference numeral corresponding with embodiment five, is risen to be easy
See, hereafter only describes the distinctive points with embodiment five；The embodiment six and embodiment five the difference is that：The machinery mill
Powder machine is 50HZ in the operating frequency for carrying out raw materials particles fine grinding process host, and wind turbine frequency is 45HZ, and classification unit frequency is
40HZ can get the powder that graphous graphite powder powder index is 32 μm, percent of pass 73.9%；The powder that powder index is 63 μm
Material, percent of pass 97.4%；The powder that powder index is 80 μm, percent of pass 98.2%；The powder that powder index is 100 μm
Material, percent of pass 98.9%；Different by different artificial graphites require to select corresponding powder index, by artificial stone
Ink powder powder index accurately controls, and under the premise of so that artificial graphite is met its compactness, intensity and wearability, improves its production
Efficiency.
For the visual representations to the embodiment described in embodiment two to six, it is summarized as follows shown in table：
Embodiment seven
A kind of mechanical flour mill in the present embodiment is described according to Figure of description Fig. 4-9.
As shown in Fig. 4,5,6,7 and 8, a kind of machinery flour mill, including wind turbine 1 and grader 2, further include host 3, the master
Machine 3 include fine grinding storehouse 31, be rotatably dispose in the fine grinding storehouse 31 Moving plate 32, be fixedly installed on the Moving plate 32 tup 33,
It is installed on the driving that gear ring 34 and the driving Moving plate 32 in the fine grinding storehouse 31 and positioned at 32 outer ring of the Moving plate rotate
Motor 35 forms milling area 36 between the Moving plate 32 and the gear ring 34；Powder is through being opened on 31 side wall of the crushing tooth
Feed inlet 311 fall on Moving plate 32, rotate through the Moving plate 32 and with centrifugation got rid of powder to the milling area 36, through moving
The outer circumference surface of disk 32 carries out fine grinding processing with the relative friction of gear ring 34 to powder, and powder is formed by after fine grinding through wind turbine 1
Negative pressure gas flow caused by operating drives, and is exported after the screening filtering of grader 2, forms the powder of standard index.
Further, as shown in Fig. 4,5 and 8, the fine grinding storehouse 31 is arranged for tubular construction, and the grader 2 is located at should
The top in fine grinding storehouse 31 is sequentially communicated setting in the wind turbine 1, grader 2 and fine grinding storehouse 31；Through Moving plate 31 and gear ring 34 to powder
After body carries out fine grinding processing, operates generated adsorption gas flow through wind turbine 1 and the rotation of Moving plate 32 is formed by the whirlpool containing powder
Vortex air flow absorption output, realizes the continuous output of powder after fine grinding.
Further, as shown in figs. 5 and 9, the filter cartridge construction setting that the grader 2 rotates, and it sets for horizontal installation
It sets；In the present embodiment, powder is carried out in screening process by grader 2, is rotated after unqualified powder is isolated, driven big
Particle powder is fallen in side, realizes grader 2 to bulky grain powder while screening out and shift, by grader 2
Different location carries out powder screening, while preventing bulky grain powder from stopping to strainer, improves production efficiency；In the present embodiment
In, grader 2 will be adsorbed thereon by rotation centrifugation and intransitable bulky grain powder is thrown away, and passes through on the outside of filter core
The shell structure being equipped with it realizes that the unilateral side of bulky grain powder is fallen.
Further, as it can be seen in figures 5 and 6, the tup 33 is 18-30 a and uniformly distributed and convex around the axis of the Moving plate 32
It rises and is mounted thereon surface；It is tested by many experiments, when the quantity of tup 33 is in 18-30, powder particles shape result
In uniform spherical, when the quantity of tup 33 is very few, it is unfavorable for the spherical processing of powder particles, when excessive, tup 33
The distance between it is smaller, be unfavorable for the operating of powder particles, to reduce the number of shocks of tup 33 and powder particles；In this reality
It applies in example, the spherical processing of powder particles, mainly drives the tup 33 in motion process with rotation through air-flow by powder particles
The round and smooth processing of powder particles shape corner angle is realized in collision.
In addition, as shown in FIG. 7 and 8, the powder formed after 3R raymond grinding powder crusher machines is fallen within after entering in fine grinding storehouse 31
On turntable 32, during being thrown away to milling area 36 with centrifugation in 32 rotation process of turntable, hits, realize through tup 33
Preliminary shaping to powder；Powder is after turntable 32 and 34 fine grinding of gear ring processing, produced by driving tup 33 to rotate through turntable 32
Vortical flow by the powder in milling area 36 it is poly- in absorption, then through wind turbine 1 operate caused by adsorption gas flow carry powder
Material exports after the filtering screening of grader 2, realizes the output of standard index powder.
Further, as it can be seen in figures 5 and 6, the gear ring 34 is arranged for annular gear structure, and the height of the tup 33 is low
In the height of gear ring 34, powder granule is gathered in after the centrifugation of turntable 32 is thrown away in milling area 36, and the height by gear ring 34 is big
It is arranged in the height of tup 33, powder is made during aggregation, to have the tup 33 in rotation along turntable 32 in the area 36 that is milled
It radially outward pushes, realizes the automated packing in milling area 36.
In the present invention, it is to be understood that：Term "center", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness
Degree ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " clockwise ",
The orientation or position relationship of instructions such as " counterclockwise " are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of retouching
It states the present invention and simplifies description, do not indicate or imply the indicated equipment or specific orientation that element must have, Yi Te
Fixed azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite important
Property or implicitly indicate the quantity of indicated technical characteristic.Therefore, define " first ", the feature of " second " can be expressed or
Person implicitly includes one or more this feature.In description of the invention, the meaning of " plurality " is two or two with
On, unless otherwise specifically defined.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
The change or replacement that any one skilled in the art can readily occur under the technical clarification of the present invention, such as pass through
By the integration of powder fine grinding and shaping, in conjunction in raw material corase grinding and fine grinding reforming process respectively to its host, wind turbine and classification
The FREQUENCY CONTROL of machine realizes that powder index accurately controls, design concept, should all cover protection scope of the present invention it
It is interior.Therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (9)
1. a kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder, which is characterized in that include the following steps：
(a) graphous graphite powder raw material are put into jaw crusher by primary comminution, obtain grain size after crushing less than 20mm's
Raw materials particles；
(b) raw materials particles obtained in the step (a) are sent into 3R raymond mills and are rolled brokenly by coarse grinding treatment
It is broken, by controlling the operating frequency of 3R raymond mill upper fan a and grader a, obtain the powder of 150-200 μm of grain size
Grain；
(c) powder granule obtained by the step (b) is sent into mechanical flour mill, by mechanical flour mill by fine grinding shaping
Turntable on host carries out fine grinding processing and primary shaping to relatively rotate friction mode with gear ring to the powder granule, and passes through
The two level shaping of powder is realized in the collision of multiple tups for being arranged on turntable and powder granule, so as to get powder particle size 32-100
μm and shape be in near-spherical；Controlling wind turbine frequency simultaneously makes the powder after two level shaping under the ascending air effect of its generation
The powder that output obtains standard index, 32-100 μm of the powder particle size of the standard index are screened through grader.
2. a kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to claim 1, special
Sign is that the turntable will fall within powder granule thereon and be thrown away to the milling area between turntable and gear ring to rotate centrifugation
Interior, powder granule is moved to the milling while carrying out fine grinding processing to powder granule by the relative motion of turntable and gear ring
During area, powder granule is contacted with gear ring in a manner of impacting, and realizes primary shaping of the gear ring to powder granule.
3. a kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to claim 2, special
Sign is that the powder that the powder granule is formed through turntable and gear ring fine grinding is formed by whirlpool through the rotation of driven by rotary disc tup
Air-flow drives powder to pass through the movement locus of the tup and by during mobile within outer, through tup with collision mode pair with
Its powder contacted carries out two level shaping.
4. a kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to claim 3, special
Sign is, after the powder two level shaping, the ascending air that is formed in a manner of negative-pressure adsorption through wind turbine is by the powder in vortical flow
Material absorption moves up, and after the grader filtering screening, is driven and is exported by ascending air.
5. a kind of milling method of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to claim 1, special
Sign is, further includes two level milling, and the powder forms fine powder material and coarse powder material, the fine powder material after grader filtering screening
It drives through ascending air and is exported after grader；The coarse powder material is detached coarse powder material with fine powder material with rotating manner through grader
Free-falling afterwards is in contact with the powder granule thrown away through turntable centrifugation, is driven by the powder granule and enters milling area progress two
Secondary milling.
6. a kind of powder side processed of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to any one of claims 1 to 5
Method, which is characterized in that the raw material are coke, content of ashes≤0.7% in coke, sulfur content≤0.8%, moisture≤
0.5%, bulk density >=1.6g/cm3, the μ Ω m of resistivity≤100.
7. a kind of powder side processed of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to any one of claims 1 to 5
Method, which is characterized in that when the 3R raymond mills carry out coarse grinding treatment to raw materials particles, wind turbine thereon and grader frequency
Rate is controlled respectively between 30-45HZ and 30-40HZ.
8. a kind of powder side processed of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to any one of claims 1 to 5
Method, which is characterized in that during carrying out raw materials particles fine grinding, host operating frequency thereon is the machinery flour mill
40-50HZ, wind turbine frequency are 30-45HZ, and classification unit frequency is 20-40HZ.
9. a kind of powder side processed of high temperature gas cooled reactor nuclear fuel element graphous graphite powder according to any one of claims 1 to 5
Method, which is characterized in that the specification of the powder includes that target particle size is 32 μm, and it is 65- to pass through the percent of pass of the grader
75%；Target particle size is 63 μm, and it is 92-98% to pass through the percent of pass of the grader；Target particle size is 80 μm, passes through institute
The percent of pass for stating grader is 96-98%；Target particle size is 80 μm, and it is 98-100% to pass through the percent of pass of the grader.
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| CN113800511A (en) * | 2020-06-11 | 2021-12-17 | 清华大学 | Natural graphite powder for nuclear reactor fuel element and preparation method thereof |
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