CN108751182A - One kind roasting roasting technique for isostatic pressing formed graphite one - Google Patents
One kind roasting roasting technique for isostatic pressing formed graphite one Download PDFInfo
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- CN108751182A CN108751182A CN201810564266.7A CN201810564266A CN108751182A CN 108751182 A CN108751182 A CN 108751182A CN 201810564266 A CN201810564266 A CN 201810564266A CN 108751182 A CN108751182 A CN 108751182A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/20—Graphite
- C01B32/205—Preparation
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
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Abstract
The present invention provides a kind of for the roasting roasting technique of isostatic pressing formed graphite one, by before graphite green compact carry out first time roasting, one layer of organic coating film is uniformly coated on graphite green compact outer surface, isolation graphite products and sand in roasting process are in direct contact, the organic gas evaporated in graphite products heating process is absorbed using organic coating film carbonisation simultaneously, itself gas expansion generated simultaneously by graphite products in roasting process achievees the purpose that pressurization, so that pressure calciner is roasted according to firing pressure process curve, the technical problem of graphite products surface sand easy to stick after solving to roast in the prior art improves the analysis coke amount of product simultaneously.
Description
Technical field
The present invention relates to nuclear graphite production field technologies, more particularly to a kind of isostatic pressing formed graphite one that is used for roast roasting technique.
Background technology
Graphite is used for thermal reactor, also holds promise for fusion reactor, fuel region is can be used as in thermal reactor
Neutron moderator, the reflector material around fuel region and heap core inner structural material.
Nuclear graphite (nuclear graphite), be for nuclear industry in terms of graphite material.
Nuclear graphite is in direct contact all products of nuclear fission, therefore, material sheet for component most crucial in high temperature gas cooled reactor
In the advance of technical aspect, the reliability of aspect of performance and repeatability and extensive big specification graphite material system
The stability for making aspect will directly limit normal service life, nuclear power station operation overall economic efficiency, the Yi Jihe of nuclear reactor
The effective and safe of resource utilizes.Artificial graphite prepared by previous methods can not in size, reliability (effective neutron irradiation test)
Meet the requirement of nuclear reactor, therefore nuclear graphite materials development, and reactor is being equivalent to nuclear graphite physics/mechanical behavior
Variation features under the conditions of interior abundant and comprehensively characterize, become people's urgent problem to be solved.
Nuclear graphite is different from the working environment of non-nuclear graphite, the former works in strong Neutron Radiation Field, chronic should fission
The fast neutron of generation absorbs neutron less as possible again, and fast neutron irradiated makes the structure of graphite change, to make and knot of tissue
The related graphite all properties of structure all change, and with the increase of fast neutron fluence, the structure and property of graphite are all that variation is (dynamic
State), neutron-absorbing and fast neutron irradiated problem is not present in non-nuclear graphite.
Chinese patent CN201510244836.0 describes a kind of roasting technique of big specification isotropic graphite green compact, adopts
Graphite green compact are roasted with concatenation type electricity：The graphite green briquette of setting head and the tail concatenation, green compact between furnace end electrode and furnace rear electrode
Soft graphite pad is set between green compact, green compact and electrode plate, stove tail installation automatic telescopic pressure apparatus is connected with electrode, according to
The expansion of graphite green compact and contraction automatic telescopic in electric roasting process.Using the big specification isotropic graphite of the method for the present invention in heat
In processing procedure, heat is transmitted and heats up highly uniform, can ensure that thermal expansion and cold events synchronize in product, reduce because of planted agent
The crackle that power is inconsistent and generates, thus product qualification rate can be increased substantially, but roasting technique energy consumption is big.
In existing technology, in the first time roasting process for carrying out graphite green compact, often dress is roasted to special pressure
Interior filling yellow sand is set to carry out the conduction of heat, but is found in inventor's actual production manufacturing process, when graphite green compact are adding
Organic gas can be volatilized in thermal process, tar ingredients are wherein contained in organic gas, and tar easily bonds the yellow sand of surrounding
On graphite products surface, surface cleaning processing is had to pass through before flowing into next procedure, widespread practice is in industry at present
The viscous husky part of graphite products is directly cut away, on the one hand which can so that product is impaired, on the other hand so that the life of product
Cost is produced to increase.
Invention content
One kind of offer in view of the deficiencies of the prior art of the present invention roasts roasting technique for isostatic pressing formed graphite one, by stone
Before black green compact carry out first time roasting, one layer of organic coating film is uniformly coated on graphite green compact outer surface, isolation was roasting
Graphite products and sand are in direct contact in journey, while will be waved in graphite products heating process using organic coating film carbonisation
The organic gas issued is absorbed, while itself gas expansion generated by graphite products in roasting process reaches
The purpose of pressurization so that pressure calciner is roasted according to firing pressure process curve, is solving to roast in the prior art
The technical problem of graphite products surface sand easy to stick afterwards improves the analysis coke amount of product simultaneously.
To achieve the above object, the present invention provides the following technical solutions：
Step 1, cladding will coat one layer of coating film on the outer surface of the graphite green compact after the completion of isostatic pressing so that
Graphite green compact are isolated with its external environment, wherein coating film is organic coating film；
Step 2, bottom material filling, underfill has the filler material of heat transfer character, filler material thick in pressure calciner
Degree is 3~5cm, and is tamped to the filler material；
Multiple graphite green compact after being coated in the step 1 are deposited in pressure roasting by step 3, shove charge uniformly at intervals
In device；
Step 4, filling in stove, by the filler material with heat transfer character by between graphite green compact in the step 3 with
And the gap between graphite green compact and pressure calciner inner wall is filled so that filler material is full of in pressure calciner
Portion, and the filler material is tamped；
Step 5, roasting, heats the graphite green compact in pressure calciner, wherein in pressure calciner
Pressure is controlled, it is made to be roasted according to firing pressure process curve.
As an improvement, organic coating film is brown paper in the step 1, brown paper is evenly coated at outside graphite green compact
On surface, opening is sealed with common adhesive plaster after being covered to complete.
As an improvement, organic coating film is sawdust clad in the step 1, which is that outer shape is big
In the wooden box of graphite green compact, keep the holding of graphite green compact horizontal in the sawdust and compacting that wooden box underfill thickness is 2~3mm, so
Graphite green compact are fitted into wooden box afterwards.
As an improvement, the enclosed construction of the generally bottom opening of the wooden box, and its spacing between graphite green compact
For 0.3~2mm.
As an improvement, the tower structure of the generally hollow out of the wooden box, the spacing between graphite green compact is 1~
3mm, and be filled and tamp by gap of the sawdust between graphite green compact and wooden box that grain diameter is 0.1~0.5mm,
When filling the gap between graphite green compact and wooden box using sawdust, observes at any time and correct the axis of graphite green compact and the axis of wooden box
Institute's angle degree α between line so that α meets, 15 ° of 0≤α <, preferably 0 °.
As an improvement, the spacing distance between the graphite green compact stacked in the step 3 is 5~7cm.
As an improvement, when being filled material in the step 4, the axis and gravity of graphite green compact are observed and corrected at any time
The angle in direction so that the axis of graphite green compact and the angle of gravity direction are 0~15 °, when filler material height and graphite green compact
The ratio of height reach 2：Stop observation and correction when 5~6, the filler material is preferably yellow sand.
As an improvement, after stopping the angle of axis and gravity direction of observation and correction graphite green compact, filler material is filled
Often rise one section of height and carries out primary compacting until filler material all covers graphite green compact.
As an improvement, the ratio of graphite green compact height and filler material thickness inside pressure calciner is 2~3：7~9.
As an improvement, before being roasted in the step 5, need that nitrogen gas progress will be passed through in pressure calciner
Catch up with gas, the relationship between the firing pressure and calcination temperature as follows：
The beneficial effects of the present invention are：
(1) present invention coats one layer before isostatic pressing formed graphite green compact carry out first time roasting on graphite green compact outer surface
Organic coating film, isolation graphite products and sand in roasting process are in direct contact, while being carbonized using organic coating film
Journey absorbs the organic gas evaporated in graphite products heating process, achievees the effect that one action is dual-purpose, selection has
Machine coating film carry out product and sand isolation, organic coating film after high-temperature roasting carbonization form ashes (organic carbon),
This is identical as graphite products quality, therefore will not be impacted to graphite products quality, reduces graphite products and is roasted in first time
Viscous husky rate after burning, wherein when being roasted, when being warming up to 300~450 DEG C, graphite green compact are generating organic gas,
Organic coating film carries out first carbonization in the temperature section and forms one layer of carbonized film simultaneously, on the one hand which produces graphite green compact
Raw organic gas is absorbed, and on the other hand graphite products are isolated with yellow sand, and yellow sand is prevented to be adhered to graphite production
Product surface；
(2) present invention is roasted when isostatic pressing formed graphite green compact carry out the first roasting according to firing pressure process curve,
When being warming up to 300~450 DEG C, graphite green compact generate the formation that organic gas is carbonized for the first time on the temperature section
Carbonized film is absorbed, and interior organic gas is effectively discharged on graphite green compact, improves graphite products carbonation rate, wherein stone
The carbonation rate of graphite product is embodied by the analysis coke amount in experimental data, while being generated in this process in 450~700 DEG C of graphite products
A large amount of organic gas, while organic coating film realizes carbonization into ashes on the temperature section, the ashes formed after carbonization are inhaled
Attached organic gas is discharged by the flue gas pipeline in pressure calciner, further improves the carbonation rate of graphite products, together
When by special sealing device, the gas that product when heating generates cannot be exported into the external world, by the gas expansion of itself
Achieve the purpose that pressurization, improves the burnt amount of pitch analysis of graphite products, improve the performance of graphite products；
(3) present invention will be spaced stacking between graphite green compact, on the one hand so that graphite green compact when heating can be true
Being heated evenly for each graphite green compact is protected, on the other hand so that graphite green compact generated during heating becomes graphite products
Organic gas will not mutually have an impact, and improve the quality of graphite products entirety.
In short, graphite products produced by the present invention have the advantages that viscous husky rate is low, the burnt amount of pitch analysis is low, it is particularly suitable for core
Graphite production field technology.
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 process flow chart of the present invention；
Fig. 2 is the structure diagram of the calciner of the present invention；
Fig. 3 is that structural schematic diagram of the brown paper as coating film coated graphite green compact is used in the present invention；
Fig. 4 is structural representation of the wooden box as organic coating film coated graphite green compact in the present invention using closed structure
Figure；
Fig. 5 is structural representation of the wooden box as organic coating film coated graphite green compact in the present invention using tower structure
Figure.
Specific implementation mode
Technical solution in the embodiment of the present invention is clearly and completely illustrated below in conjunction with the accompanying drawings.
Embodiment one
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.
One kind roasting roasting technique for isostatic pressing formed graphite one, includes the following steps：
Step 1, cladding will coat one layer of coating film on the outer surface of the graphite green compact after the completion of isostatic pressing so that
Graphite green compact are isolated with its external environment, wherein coating film is organic coating film；
Step 2, bottom material filling, underfill has the filler material of heat transfer character, filler material thick in pressure calciner
Degree is 3~5cm, and is tamped to the filler material；
Multiple graphite green compact after being coated in the step 1 are deposited in pressure roasting by step 3, shove charge uniformly at intervals
In device；
Step 4, filling in stove, by the filler material with heat transfer character by between graphite green compact in the step 3 with
And the gap between graphite green compact and pressure calciner inner wall is filled so that filler material is full of in pressure calciner
Portion, and the filler material is tamped；
Step 5, roasting, heats the graphite green compact in pressure calciner, wherein in pressure calciner
Pressure is controlled, it is made to be roasted according to firing pressure process curve.
Further, organic coating film is brown paper in the step 1, and brown paper is evenly coated at outside graphite green compact
On surface, opening is sealed with common adhesive plaster after being covered to complete.
It should be noted that as shown in figure 3, being used as organic coating film using brown paper in the present embodiment, on the one hand
Brown paper quality is soft, operability is good, another aspect brown paper after high-temperature roasting remaining product be ashes it is (organic
Carbon) it is identical as the quality of graphite products, the quality of graphite products will not be had an impact.
Further, the spacing distance between the graphite green compact stacked in the step 3 is 5~7cm, by graphite green compact
Between be spaced stack, on the one hand so that graphite green compact can ensure that being heated evenly for each graphite green compact when heating, it is another
Aspect makes the organic gas that graphite green compact generate during heating becomes graphite products mutually not have an impact, and carries
The quality of high graphite products entirety.
Further, when being filled material in the step 4, the axis and gravity of graphite green compact are observed and corrected at any time
The angle in direction so that the axis of graphite green compact and the angle of gravity direction are 0~15 °, when filler material height and graphite green compact
The ratio of height reach 2：Stop observation and correction when 5~6, the filler material is preferably yellow sand.
It should be noted that filler material is preferably yellow sand, one side yellow sand has preferable heat conductivity, it can be ensured that
Each section is heated evenly when carrying out the heating of graphite green compact, and another aspect yellow sand cost is relatively low, reduces graphite products production process
In cost.
It should be noted that during being filled yellow sand, ensure the angle of the axis and gravity direction of graphite green compact
It is 0 to 15 °, preferably 0 ° in the present embodiment, it is ensured that graphite green compact can be heated evenly during heating, roasted and filled in pressure
Set interior heat transmission be transmitted to lower and upper along gravity direction, by the angle of the axis of graphite green compact and gravity direction into
Row is constantly corrected to 0 °, ensures that graphite green compact are heated evenly in thermal histories, in the height of filler material height and graphite green compact
Ratio reach 2：Stop filling when 5~6, at this point, the height of filler material is generally in the centre position of graphite green compact height, at this time
After being tamped, graphite green compact will be stabilized in filler material.
Further, after stopping the angle of axis and gravity direction of observation and correction graphite green compact, filler material is filled
Often rise one section of height and carry out primary compacting until filler material all covers graphite green compact, graphite, which can be improved, using which gives birth to
The axis of base and gravity direction angle correct are more accurate.
Further, the ratio of graphite green compact height and filler material thickness inside pressure calciner is 2~3：7~9.
Further, it before being roasted in the step 5, needs that nitrogen gas progress will be passed through in pressure calciner
Catch up with gas, the relationship between the firing pressure and calcination temperature as follows：
It should be noted that it is that inventor obtains in actual tests subsequent analysis to select above-mentioned firing pressure process curve
Optimum data is carried out with nitrogen catching up with gas before roasting, the air in device is completely exhausted out so that inventor in device according to
Hot pressure sintering technological parameter and test result are as shown in table 1 below：
1 hot pressure sintering technological parameter of table and test result
| Firing pressure value/bar | Weightlessness/% | Pitch analyses coke amount/% |
| 0 | 11.1 | 37.8 |
| 1 | 10.5 | 45.8 |
| 2 | 9.3 | 50.3 |
| 3 | 7.2 | 68.1 |
| 4 | 6.6 | 75.2 |
| 5 | 5.8 | 78.3 |
| 6 | 5.8 | 78.5 |
| 7 | 5.8 | 78.2 |
It can intuitively be obtained by upper table, when firing pressure value is higher than 5bar, the burnt amount of pitch analysis does not increase substantially,
Therefore it selects 5bar to carry out the pressurized, heated of graphite green compact as standard process parameters, and is selected in 300~450 DEG C of temperature sections
3~4bar is to be extremely difficult to the requirement of 5bar, while 3 because the gas that product evaporates in device at this temperature is less
When~4bar, analyse burnt amount with analysis coke amount when 5bar very close to.
It should be noted that in the relationship for combining graphite products analysis burnt amount and firing pressure value shown in upper table, tie simultaneously
Graphite products and organic coating film are closed in the characteristic of each temperature section, at 300~450 DEG C, graphite products proceed by carbonization, this
When graphite products will generate organic gas, meanwhile, organic coating film also carries out first carbonization at 300~450 DEG C and forms one
Layer organic carbon film, organic carbon film absorb the organic gas that graphite products generate, and completely cut off graphite products and Huang
Husky is in direct contact, and at 450~700 DEG C, graphite products generate large amount of organic gas, while organic coating film carries out completely
Carbonization forms ashes, and ashes carry out the absorption of the organic gas of graphite products generation and are discharged by pressure calciner, improved
The analysis coke amounts of graphite products, at 700 DEG C or more, graphite products no longer generate organic gas in temperature-rise period, at this time
Organic coating film carbonization, graphite products and yellow sand be in direct contact and will not have yellow sand to be adhered to graphite products at this time
Surface.
Embodiment two
Reference numeral corresponding with embodiment one wherein is used with a kind of identical or corresponding component of embodiment, is risen to be easy
See, hereafter only describes the distinctive points with embodiment one.The embodiment two embodiment one as shown in figure 3 the difference is that：
Organic coating film is sawdust clad in the step 1, which is that outer shape is more than graphite green compact
Wooden box, keep the holding of graphite green compact horizontal in the sawdust and compacting that wooden box underfill thickness is 2~3mm, then give birth to graphite
Base is fitted into wooden box.
It should be noted that selecting sawdust as organic coating layer in the present embodiment, actual production is carried out in inventor
Shi Faxian, using sawdust as organic coating layer compared with the viscous sand for the graphite products produced using brown paper as organic coating layer
Rate is lower.
Further, as shown in figure 4, the enclosed construction of the generally bottom opening of the wooden box, and itself and graphite green compact
Between spacing be 0.3~2mm, facilitate graphite green compact to be placed in wooden box.
Embodiment three
Reference numeral corresponding with embodiment one wherein is used with a kind of identical or corresponding component of embodiment, is risen to be easy
See, hereafter only describes the distinctive points with embodiment one.The embodiment three embodiment one as shown in figure 3 the difference is that：
Further, as shown in figure 5, the tower structure of the generally hollow out of the wooden box, between graphite green compact
Spacing be 1~3mm, and carried out by gap of the sawdust between graphite green compact and wooden box that grain diameter is 0.1~0.5mm
It fills and tamps, when filling the gap between graphite green compact and wooden box using sawdust, observe and correct the axis of graphite green compact at any time
Institute's angle degree α between line and the axis of wooden box so that α meets, 15 ° of 0≤α <, preferably 0 °.
Comparative example one
On the basis of embodiment one, embodiment two and embodiment three, step 1 is saved, tests to obtain by inventor
The viscous husky rate comparison of graphite products is as shown in table 2 below：
The viscous husky rate comparison of 2 product of table
It can intuitively be obtained by upper table, when coating one layer of organic coating film to the graphite green compact outer surface before roasting, stone
The viscous husky rate of graphite product is substantially reduced, and effect highly significant.
The temperature-rise period of graphite green compact：
At 300~450 DEG C, graphite products proceed by carbonization, and graphite products will generate organic gas at this time, together
When, organic coating film also carries out first carbonization at 300~450 DEG C and forms one layer of organic carbon film, and organic carbon film is by graphite
The organic gas that product generates is absorbed, and completely cuts off being in direct contact for graphite products and yellow sand, at 450~700 DEG C, stone
Graphite product generates large amount of organic gas, while organic coating film carries out carbonization and forms ashes, and ashes carry out graphite products
The absorption of the organic gas of generation is simultaneously discharged by pressure calciner, the analysis coke amount of graphite products is improved, at 700 DEG C or more
When, graphite products no longer generate organic gas in temperature-rise period, organic coating film carbonization at this time, and graphite produces at this time
Product, which with yellow sand be in direct contact, will not have yellow sand to be adhered to graphite products surface.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, do not indicate or imply the indicated equipment or element must have a particular orientation, with spy
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 relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
The foregoing description of the disclosed embodiments makes those skilled in the art not depart from the spirit and scope of the present invention
In the case of, various changes or equivalence replacement can be carried out to these features and embodiment.In addition, under the teachings of the present invention,
Can modify to these features and embodiment with adapt to particular situation and material without departing from the present invention spirit and
Range.Therefore, the present invention is not limited to the particular embodiment disclosed, fallen with claims hereof range
Interior embodiment belongs to protection scope of the present invention.
Claims (10)
1. one kind roasting roasting technique for isostatic pressing formed graphite one, which is characterized in that include the following steps：
Step 1, cladding will coat one layer of coating film so that graphite on the outer surface of the graphite green compact after the completion of isostatic pressing
Green compact are isolated with its external environment, wherein coating film is organic coating film；
Step 2, bottom material filling, filler material of the underfill with heat transfer character, filler material thickness are in pressure calciner
3~5cm, and the filler material is tamped；
Multiple graphite green compact after being coated in the step 1 are deposited in pressure calciner by step 3, shove charge uniformly at intervals
It is interior；
Step 4, filling in stove will be between graphite green compact in the step 3 and stone by the filler material with heat transfer character
Gap between black green compact and pressure calciner inner wall is filled so that and filler material is full of inside pressure calciner, and
The filler material is tamped；
Step 5, roasting, heats the graphite green compact in pressure calciner, wherein to the pressure in pressure calciner
It is controlled, when calcination temperature is 300 DEG C~450 DEG C, pressure is in 3~4bar in control calciner, when calcination temperature is 450
DEG C~700 DEG C, control calciner in pressure in 5~7bar.
2. according to claim 1 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that the step 1
Middle organic coating film is brown paper, brown paper is evenly coated on graphite green compact outer surface, with common adhesive plaster after being covered to complete
Opening is sealed.
3. according to claim 1 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that the step 1
Middle organic coating film is sawdust clad, which is the wooden box that outer shape is more than graphite green compact, in wooden box bottom
Filling thickness is the sawdust of 2~3mm and compacting keeps the holding of graphite green compact horizontal, and then graphite green compact are fitted into wooden box.
4. according to claim 3 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that the wooden box
The generally enclosed construction of bottom opening, and its spacing between graphite green compact is 0.3~2mm.
5. according to claim 3 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that the wooden box
Spacing between the generally tower structure of hollow out, with graphite green compact is 1~3mm, and by grain diameter be 0.1~
Gap of the sawdust of 0.5mm between graphite green compact and wooden box is filled and tamps, using sawdust filling graphite green compact with
When gap between wooden box, observes at any time and correct institute's angle degree α between the axis of graphite green compact and the axis of wooden box so that α
Meet, 15 ° of 0≤α <, preferably 0 °.
6. according to claim 1 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that the step 3
Spacing distance between the graphite green compact of middle stacking is 5~7cm.
7. according to claim 1 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that the step 4
In when being filled material, observe at any time and correct the axis of graphite green compact and the angle of gravity direction so that the axis of graphite green compact
The angle of line and gravity direction is 0~15 °, when the ratio of filler material height and the height of graphite green compact reaches 2：Stop when 5~6
Observation and correction, the filler material is preferably yellow sand.
8. according to claim 7 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that stopping observing
After the axis of correction graphite green compact and the angle of gravity direction, it is straight that filling filler material often rises one section of primary compacting of height progress
Graphite green compact are all covered to filler material.
9. according to claim 1 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that graphite green compact are high
The ratio of degree and filler material thickness inside pressure calciner is 2~3：7~9.
10. according to claim 1 a kind of for the roasting roasting technique of isostatic pressing formed graphite one, which is characterized in that the step
Before being roasted in five, nitrogen gas will be passed through by needing in pressure calciner carries out catching up with gas.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111180193A (en) * | 2020-01-17 | 2020-05-19 | 赣州诚正稀土新材料股份有限公司 | Unmanned flexible magnetic field forming method |
| CN112010651A (en) * | 2020-09-08 | 2020-12-01 | 四川大学 | Anode material forming and roasting integrated preparation equipment and preparation method |
| CN113860877A (en) * | 2021-09-29 | 2021-12-31 | 大同新成新材料股份有限公司 | Isostatic pressing graphite product and positive and negative pressure roasting method thereof |
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| CN111180193A (en) * | 2020-01-17 | 2020-05-19 | 赣州诚正稀土新材料股份有限公司 | Unmanned flexible magnetic field forming method |
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| CN113860877A (en) * | 2021-09-29 | 2021-12-31 | 大同新成新材料股份有限公司 | Isostatic pressing graphite product and positive and negative pressure roasting method thereof |
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