CN108530077A - A kind of graphite electrode manufacturing process - Google Patents
A kind of graphite electrode manufacturing process Download PDFInfo
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- CN108530077A CN108530077A CN201810384527.7A CN201810384527A CN108530077A CN 108530077 A CN108530077 A CN 108530077A CN 201810384527 A CN201810384527 A CN 201810384527A CN 108530077 A CN108530077 A CN 108530077A
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- 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
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- 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
- C04B35/528—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 obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—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 obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
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- 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
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Abstract
The invention discloses a kind of graphite electrode manufacturing process, include the following steps：S100, dispensing, S200, molding, S300, roasting and dipping, S400, graphitization, S500, machining.Present invention process is simple, and manufacturing cost is relatively low, and end properties are not weaker than mainstream finished product in the market, even better than import finished product.Therefore, it is possible to bring the profit margin of bigger for enterprise, the competitiveness of enterprise is improved.
Description
Technical field
The present invention relates to a kind of graphite electrodes, more particularly to a kind of graphite electrode manufacturing process.
Background technology
Graphite electrode refers to using petroleum coke, pitch coke as aggregate, and coal tar pitch is adhesive, by raw material calcining, broken mill
Powder, dispensing, kneading, molding, roasting, dipping, graphitization and mechanical processing and a kind of manufactured high temperature resistant graphite conductive material.
It is widely used in：
(1) it is used for electrical arc furnace
Electric furnace steel making is the use rich and influential family of graphite electrode.China's electric furnace output of steel accounts for about 18% or so of crude steel yield, steel-making stone
Electrode ink accounts for the 70%~80% of the total dosage of graphite electrode.Electric furnace steel making is that electric current is imported into stove using graphite electrode, utilizes electricity
Extremely high temperature heat source caused by starting arc is smelted between portion and furnace charge.
(2) it is used for ore-smelting electric furnace
Ore-smelting electric furnace is mainly for the production of industrial silicon and yellow phosphorus etc., its main feature is that the lower part of conductive electrode is embedded in furnace charge, is expecting
Electric arc is formed in layer, and heats furnace charge using the thermal energy that the resistance of furnace charge itself is sent out, wherein requiring current density higher
Ore-smelting electric furnace need to use graphite electrode, such as often production 1t silicon need to consume graphite electrode about 100kg, often produce 1t yellow phosphorus need to consume
Graphite electrode about 40kg.
(3) it is used for resistance furnace
The electric furnace etc. for producing the graphitizing furnace of graphite product, the melting furnaces for melting glass and production silicon carbide belongs to resistance furnace,
Interior the filled material of stove is both heating resistor and by heating target, in general, conductive graphite electrode is embedded in resistance end furnace
In burner wall, discontinuously consumed for graphite electrode herein.
(4) special-shaped graphite products are used to prepare
The blank of graphite electrode is additionally operable to be processed into the special-shaped graphite products such as various crucibles, mold, boat and heater.For example,
In quartz glass industry, 1t electric smelting pipes are often produced, graphite electrode stock 10t need to be used；1t quartz bricks are often produced, graphite electricity need to be consumed
Pole blank 100kg.
The manufacturing process of graphite electrode is very ripe and diversified at present, and end properties are also relatively high, but each
The manufacturing process of producer belongs to confidential state or by patent protection, and therefore, it is necessary to enter the manufacturing field of graphite electrode to be just engaged in
Must design it is a kind of it is completely new, with the distinguishing manufacturing process of the prior art, but currently, the manufacturing process by designed, designed is wanted
Complex process, yield rate are low, cause cost increase so that enterprise loses competitiveness；Poor product quality so that enterprise is competing
It is poor to strive power.
Therefore, applicant proposes a kind of graphite electrode manufacturing process, simple for process, and cost is relatively low, but at moral character
Can meet the needs of current.
Invention content
In view of the drawbacks described above of the prior art, technical problem to be solved by the invention is to provide a kind of graphite electrode systems
Make technique.
To achieve the above object, the present invention provides a kind of graphite electrode manufacturing process, include the following steps：
S100, dispensing
S110, raw material, petroleum coke, needle coke, coal tar pitch, epoxy resin, carbon nanotube, the petroleum coke are that low-sulfur is burnt；
The needle coke uses coal-based needle coke；
The softening point of the coal tar pitch is 90-100 DEG C, and coking value is >=55%, ash content≤0.20%；
S120, petroleum coke, needle coke are put into calcining furnace, are passed through protection gas（Argon gas）, it is then heated to 1250-1350 DEG C,
It is kept for 0.5-1 hours, is calcined；
Petroleum coke real density after calcining is not less than 2.07g/cm3, and resistivity is not more than 550 μ Ω .m；Needle coke real density is not small
In 2.12g/cm3, resistivity is not more than 500 μ Ω .m；
S130, the petroleum coke after being calcined in S120, needle coke are crushed, fine grinding, its grain size is made to be not more than 0.075 ㎜；
S140, following components is uniformly mixed according to weight part ratio, after S300 treated petroleum cokes 10-12, S300 processing
Needle coke 4-8, carbon nanotube 1-2.Wet mixing may be used when mixing, i.e., ethyl alcohol is added in mixing, until after mixing
Drying.This mode can be quick and be comprehensively uniformly mixed it.
S150, the powder mixed in S140 is uniformly mixed into 1- with coal tar pitch, epoxy resin according to following weight part ratio
2：0.5-0.8-0.2-0.5；Incorporation time 1-2 hours；
S200, molding
S210, by S150, treated that raw material is stirred, and material temperature is increased to 90-120 DEG C, stirs 1-2 hours；
S220, it mixed raw material in S210 is put into forcing press is compacted by 4-10MPa；
S230, by the raw material being compacted in S220 by the pressure compaction of 20-25MPa, keep 3-5min, vacuumize simultaneously；
S240, by treated in S230, raw material is put into extruder, is squeezed by the pressure of 5-15MPa, then according to
Preset requirement cuts into section, and temperature is put into be cooled down in 5-10 degrees Celsius of water after cutting into section；
S300, roasting and dipping
S310, primary roasting, the raw material cut off in S240 is put into roaster, is roasted by 1250 DEG C of high temperature, and fill
Enter to protect gas（Argon gas）, heating mode is as follows：
It 0-400 DEG C, 10 DEG C/min, is kept for 1-2 hours after reaching 400 DEG C；
It 401-800 DEG C, 15 DEG C/min, is kept for 1-2 hours after reaching 800 DEG C；
801-1250 DEG C, 25 DEG C/min；It is kept for 320-480 hours after reaching 1250 DEG C；
After the completion of roasting, stops heating, be cooled to room temperature in roaster；
Coal tar pitch coking in roasting process in green compact, the fugitive constituent of discharge 10% or so, while volume generates the contraction of 2-3%,
Mass loss 8-10%.Significant changes also have occurred in the physicochemical property of charcoal base, since the porosity increases bulk density by 1.70g/
Cm3 is reduced to 1.60g/cm3, and 10000 μ Ω .m of resistivity or so are down to 40-50 μ Ω .m, and the mechanical strength for roasting base also greatly carries
It is high.
S310 treated raw materials are carried out removing surface, mainly remove flash removed, be then placed in dipping by S320, dipping
In tank, and it is preheated to 260-380 DEG C, is kept for 6-8 hours；
Then impregnating autoclave is vacuumized, and keeps 40-50min, then injected in impregnating autoclave after coal tar pitch is heated to 180-200 DEG C
So that raw material is completely immersed in coal tar pitch；
Then, protection gas is added in impregnating autoclave（Argon gas）, after air pressure reaches 1.2-1.5MPa, kept for 3-4 hours；
Last pressure release, is discharged coal tar pitch, and raw material is cooled to room temperature in impregnating autoclave, takes out and clear up surface；
S330, after baking, by S320, treated that raw material is placed again into roaster, is carried out again by 700-800 DEG C of high temperature
Secondary roasting, and it is filled with protection gas（Argon gas）, heating mode is as follows：
0-400 DEG C, 15 DEG C/min；
It 401-800 DEG C, 25 DEG C/min, is kept for 120-280 hours after reaching 800 DEG C, is then cooled to room temperature, takes in roaster
Go out to clear up surface；
After baking is roasted again after roasting product impregnates, the technique mistake for making the pitch in immersion roasting product hole carbonize
Journey.
S340, it repeats S320-S330 twice and more than twice, checks the dipping rate of body weight gain of impregnated raw material every time, it is specific to mark
It is accurate as follows：
Impregnate rate of body weight gain G=(W2-W1)/W1 × 100%；W1 is weight before dipping, and W2 is weight after dipping；
Single-steeping product rate of body weight gain >=14%；
Double-steeping product rate of body weight gain >=9%；
Pickled product rate of body weight gain >=5% three times；
S400, graphitization, by S340, treated that raw material is put into internal thermal serial (LWG) stove, is filled with protective gas and is heated to
It 2300-3000 DEG C, is kept for 9-20 hours, keeps its graphitization, specific heating mode as follows：
0-400 DEG C, 10 DEG C/min；
401-800 DEG C, 15 DEG C/min；
801-1500 DEG C, 25 DEG C/min；
1501-3000 DEG C, 40 DEG C/min；
Raw material can be made to reach following effect by this step：
1. the conduction of high Carbon Materials, thermal conductivity（Resistivity reduces 4-5 times, and thermal conductivity improves about 10 times）；
Performance and chemical stability 2. the heat resistanceheat resistant for improving Carbon Materials is shaken（Linear expansion coefficient reduces 50-80%）；
3. making Carbon Materials that there is lubricity and wear resistence；
4. impurity is discharged, the purity of Carbon Materials is improved（The ash content of product drops to 0.3% or so by 0.5-0.8%）.
S500, machining, by S400, treated that raw material is machined out, and until reaching pre-set dimension, that is, produces stone
Electrode ink.
The beneficial effects of the invention are as follows：Present invention process is simple, and manufacturing cost is relatively low, and end properties are not weaker than in the market
Mainstream finished product, even better than import finished product.Therefore, it is possible to bring the profit margin of bigger for enterprise, the competition of enterprise is improved
Power.
Specific implementation mode
With reference to embodiment, the invention will be further described：
Embodiment one
A kind of graphite electrode manufacturing process, includes the following steps：
S100, dispensing
S110, raw material, petroleum coke, needle coke, coal tar pitch, epoxy resin, carbon nanotube, the petroleum coke are that low-sulfur is burnt；
The needle coke uses coal-based needle coke；
The softening point of the coal tar pitch is 90-100 DEG C, and coking value is >=55%, ash content≤0.20%；
S120, petroleum coke, needle coke are put into calcining furnace, are passed through argon gas, be then heated to 1300 DEG C, kept for 0.5-1 hours,
It is calcined；
Petroleum coke real density after calcining is not less than 2.07g/cm3, and resistivity is not more than 550 μ Ω .m；Needle coke real density is not small
In 2.12g/cm3, resistivity is not more than 500 μ Ω .m；
S130, the petroleum coke after being calcined in S120, needle coke are crushed, fine grinding, its grain size is made to be not more than 0.075 ㎜；
S140, following components is uniformly mixed according to weight part ratio, S300 treated petroleum cokes 11, S300 treated needle
Shape coke 6, carbon nanotube 2.Wet mixing may be used when mixing, i.e., ethyl alcohol is added in mixing, until drying after mixing.
This mode can be quick and be comprehensively uniformly mixed it.
S150, the powder mixed in S140 is uniformly mixed 2 with coal tar pitch, epoxy resin according to following weight part ratio：
0.8-0.2；Incorporation time 1-2 hours；
S200, molding
S210, by S150, treated that raw material is stirred, and material temperature is increased to 100 DEG C, stirs 1-2 hours；
S220, it mixed raw material in S210 is put into forcing press is compacted by 4MPa；
S230, by the raw material being compacted in S220 by the pressure compaction of 25MPa, keep 3-5min, vacuumize simultaneously；
S240, by treated in S230, raw material is put into extruder, is squeezed by the pressure of 5-15MPa, then according to
Preset requirement cuts into section, and temperature is put into be cooled down in 5 degrees Celsius of water after cutting into section；
S300, roasting and dipping
S310, primary roasting, the raw material cut off in S240 is put into roaster, is roasted by 1250 DEG C of high temperature, and fill
Enter to protect gas（Argon gas）, heating mode is as follows：
It 0-400 DEG C, 10 DEG C/min, is kept for 1-2 hours after reaching 400 DEG C；
It 401-800 DEG C, 15 DEG C/min, is kept for 1-2 hours after reaching 800 DEG C；
801-1250 DEG C, 25 DEG C/min；It is kept for 320-480 hours after reaching 1250 DEG C；
After the completion of roasting, stops heating, be cooled to room temperature in roaster；
S310 treated raw materials are carried out removing surface, mainly remove flash removed, be then placed in impregnating autoclave by S320, dipping,
And 300 DEG C are preheated to, it is kept for 6-8 hours；
Then impregnating autoclave is vacuumized, and keeps 40-50min, then injected in impregnating autoclave and make after coal tar pitch is heated to 190 DEG C
Raw material is completely immersed in coal tar pitch；
Then, protection gas is added in impregnating autoclave（Argon gas）, after air pressure reaches 1.5MPa, kept for 3-4 hours；
Last pressure release, is discharged coal tar pitch, and raw material is cooled to room temperature in impregnating autoclave, takes out and clear up surface；
S330, after baking, by S320, treated that raw material is placed again into roaster, is roasted again by 800 DEG C of high temperature
It burns, and is filled with protection gas（Argon gas）, heating mode is as follows：
0-400 DEG C, 15 DEG C/min；
It 401-800 DEG C, 25 DEG C/min, is kept for 140 hours after reaching 800 DEG C, is then cooled to room temperature in roaster, taken out clear
Manage surface；
After baking is roasted again after roasting product impregnates, the technique mistake for making the pitch in immersion roasting product hole carbonize
Journey.
S340, it repeats S320-S330 three times, checks that the dipping rate of body weight gain of impregnated raw material, specific standards are as follows every time：
Impregnate rate of body weight gain G=(W2-W1)/W1 × 100%；W1 is weight before dipping, and W2 is weight after dipping；
Single-steeping product rate of body weight gain >=14%；
Double-steeping product rate of body weight gain >=9%；
Pickled product rate of body weight gain >=5% three times；
S400, graphitization, by S340, treated that raw material is put into internal thermal serial (LWG) stove, is filled with protective gas and is heated to
It 2700 DEG C, is kept for 12 hours, keeps its graphitization, specific heating mode as follows：
0-400 DEG C, 10 DEG C/min；
401-800 DEG C, 15 DEG C/min；
801-1500 DEG C, 25 DEG C/min；
1501-3000 DEG C, 40 DEG C/min；
S500, machining, by S400, treated that raw material is machined out, and until reaching pre-set dimension, that is, produces graphite electricity
Pole.
Embodiment two
A kind of graphite electrode manufacturing process, includes the following steps：
S100, dispensing
S110, raw material, petroleum coke, needle coke, coal tar pitch, epoxy resin, carbon nanotube, the petroleum coke are that low-sulfur is burnt；
The needle coke uses coal-based needle coke；
The softening point of the coal tar pitch is 90-100 DEG C, and coking value is >=55%, ash content≤0.20%；
S120, petroleum coke, needle coke are put into calcining furnace, are passed through protection gas（Argon gas）, it is then heated to 1250-1350 DEG C,
It is kept for 0.5-1 hours, is calcined；
Petroleum coke real density after calcining is not less than 2.07g/cm3, and resistivity is not more than 550 μ Ω .m；Needle coke real density is not small
In 2.12g/cm3, resistivity is not more than 500 μ Ω .m；
S130, the petroleum coke after being calcined in S120, needle coke are crushed, fine grinding, its grain size is made to be not more than 0.075 ㎜；
S140, following components is uniformly mixed according to weight part ratio, S300 treated petroleum cokes 12, S300 treated needle
Shape coke 9, carbon nanotube 2.Wet mixing may be used when mixing, i.e., ethyl alcohol is added in mixing, until drying after mixing.
This mode can be quick and be comprehensively uniformly mixed it.
S150, the powder mixed in S140 is uniformly mixed with coal tar pitch, epoxy resin according to following weight part ratio
1.5：0.5-0.2；Incorporation time 1-2 hours；
S200, molding
S210, by S150, treated that raw material is stirred, and material temperature is increased to 90-120 DEG C, stirs 1-2 hours；
S220, it mixed raw material in S210 is put into forcing press is compacted by 8MPa；
S230, by the raw material being compacted in S220 by the pressure compaction of 22MPa, keep 3-5min, vacuumize simultaneously；
S240, by treated in S230, raw material is put into extruder, is squeezed by the pressure of 10MPa, then according to pre-
If it is required that cutting into section, temperature is put into be cooled down in 5-10 degrees Celsius of water after cutting into section；
S300, roasting and dipping
S310, primary roasting, the raw material cut off in S240 is put into roaster, is roasted by 1250 DEG C of high temperature, and fill
Enter to protect gas（Argon gas）, heating mode is as follows：
It 0-400 DEG C, 10 DEG C/min, is kept for 1-2 hours after reaching 400 DEG C；
It 401-800 DEG C, 15 DEG C/min, is kept for 1-2 hours after reaching 800 DEG C；
801-1250 DEG C, 25 DEG C/min；It is kept for 320-480 hours after reaching 1250 DEG C；
After the completion of roasting, stops heating, be cooled to room temperature in roaster；
S310 treated raw materials are carried out removing surface, mainly remove flash removed, be then placed in impregnating autoclave by S320, dipping,
And 350 DEG C are preheated to, it is kept for 6-8 hours；
Then impregnating autoclave is vacuumized, and keeps 40-50min, then injected in impregnating autoclave and make after coal tar pitch is heated to 200 DEG C
Raw material is completely immersed in coal tar pitch；
Then, protection gas is added in impregnating autoclave（Argon gas）, after air pressure reaches 1.5MPa, kept for 3-4 hours；
Last pressure release, is discharged coal tar pitch, and raw material is cooled to room temperature in impregnating autoclave, takes out and clear up surface；
S330, after baking, by S320, treated that raw material is placed again into roaster, is roasted again by 800 DEG C of high temperature
It burns, and is filled with protection gas（Argon gas）, heating mode is as follows：
0-400 DEG C, 15 DEG C/min；
It 401-800 DEG C, 25 DEG C/min, is kept for 200 hours after reaching 800 DEG C, is then cooled to room temperature in roaster, taken out clear
Manage surface；
After baking is roasted again after roasting product impregnates, the technique mistake for making the pitch in immersion roasting product hole carbonize
Journey.
S340, it repeats S320-S330 three times, checks that the dipping rate of body weight gain of impregnated raw material, specific standards are as follows every time：
Impregnate rate of body weight gain G=(W2-W1)/W1 × 100%；W1 is weight before dipping, and W2 is weight after dipping；
Single-steeping product rate of body weight gain >=14%；
Double-steeping product rate of body weight gain >=9%；
Pickled product rate of body weight gain >=5% three times；
S400, graphitization, by S340, treated that raw material is put into internal thermal serial (LWG) stove, is filled with protective gas and is heated to
It 3000 DEG C, is kept for 20 hours, keeps its graphitization, specific heating mode as follows：
0-400 DEG C, 10 DEG C/min；
401-800 DEG C, 15 DEG C/min；
801-1500 DEG C, 25 DEG C/min；
1501-3000 DEG C, 40 DEG C/min；
S500, machining, by S400, treated that raw material is machined out, and until reaching pre-set dimension, that is, produces graphite electricity
Pole.
Place is not described in detail by the present invention, is the known technology of those skilled in the art.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (6)
1. a kind of graphite electrode manufacturing process, which is characterized in that include the following steps：
S100, dispensing
S110, raw material, petroleum coke, needle coke, coal tar pitch, epoxy resin, carbon nanotube；
S120, petroleum coke, needle coke are put into calcining furnace, are passed through protection gas（Argon gas）, it is then heated to 1250-1350 DEG C,
It is kept for 0.5-1 hours, is calcined；
S130, the petroleum coke after being calcined in S120, needle coke are crushed, fine grinding, its grain size is made to be not more than 0.075 ㎜；
S140, following components is uniformly mixed according to weight part ratio, after S300 treated petroleum cokes 10-12, S300 processing
Needle coke 4-8, carbon nanotube 1-2；
S150, the powder mixed in S140 is uniformly mixed into 1-2 with coal tar pitch, epoxy resin according to following weight part ratio：
0.5-0.8-0.2-0.5；Incorporation time 1-2 hours；
S200, molding
S210, by S150, treated that raw material is stirred, and material temperature is increased to 90-120 DEG C, stirs 1-2 hours；
S220, it mixed raw material in S210 is put into forcing press is compacted by 4-10MPa；
S230, by the raw material being compacted in S220 by the pressure compaction of 20-25MPa, keep 3-5min, vacuumize simultaneously；
S240, by treated in S230, raw material is put into extruder, is squeezed by the pressure of 5-15MPa, then according to
Preset requirement cuts into section, and temperature is put into be cooled down in 5-10 degrees Celsius of water after cutting into section；
S300, roasting and dipping
S310, primary roasting, the raw material cut off in S240 is put into roaster, is roasted by 1250 DEG C of high temperature, and fill
Enter to protect gas；
S310 treated raw materials are carried out removing surface, are then placed in impregnating autoclave, and be preheated to 260-380 by S320, dipping
DEG C, it is kept for 6-8 hours；
Then impregnating autoclave is vacuumized, and keeps 40-50min, then injected in impregnating autoclave after coal tar pitch is heated to 180-200 DEG C
So that raw material is completely immersed in coal tar pitch；
Then, protection gas is added in impregnating autoclave, after air pressure reaches 1.2-1.5MPa, is kept for 3-4 hours；
Last pressure release, is discharged coal tar pitch, and raw material is cooled to room temperature in impregnating autoclave, takes out and clear up surface；
S330, after baking, by S320, treated that raw material is placed again into roaster, is carried out again by 700-800 DEG C of high temperature
Secondary roasting, and it is filled with protection gas；
S340, it repeats S320-S330 more than twice, checks the dipping rate of body weight gain of impregnated raw material every time；
S400, graphitization, by S340, treated that raw material is put into internal thermal serial stove, is filled with protective gas and is heated to 2300-
It 3000 DEG C, is kept for 9-20 hours, makes its graphitization；
S500, machining, by S400, treated that raw material is machined out, and until reaching pre-set dimension, that is, produces graphite electricity
Pole.
2. graphite electrode manufacturing process as described in claim 1, which is characterized in that the petroleum coke is that low-sulfur is burnt；It is described
Needle coke use coal-based needle coke；The softening point of the coal tar pitch is 90-100 DEG C, and coking value is >=55%, ash content≤
0.20% 。
3. graphite electrode manufacturing process as described in claim 1, which is characterized in that heating mode is as follows in S310：
It 0-400 DEG C, 10 DEG C/min, is kept for 1-2 hours after reaching 400 DEG C；
It 401-800 DEG C, 15 DEG C/min, is kept for 1-2 hours after reaching 800 DEG C；
801-1250 DEG C, 25 DEG C/min；It is kept for 320-480 hours after reaching 1250 DEG C；
After the completion of roasting, stops heating, be cooled to room temperature in roaster.
4. graphite electrode manufacturing process as described in claim 1, which is characterized in that heating mode is as follows in S330：
0-400 DEG C, 15 DEG C/min；
It 401-800 DEG C, 25 DEG C/min, is kept for 120-280 hours after reaching 800 DEG C, is then cooled to room temperature, takes in roaster
Go out to clear up surface.
5. graphite electrode manufacturing process as described in claim 1, which is characterized in that in S340, the specific standards of inspection are as follows：
Impregnate rate of body weight gain G=(W2-W1)/W1 × 100%；W1 is weight before dipping, and W2 is weight after dipping；
Single-steeping product rate of body weight gain >=14%；
Double-steeping product rate of body weight gain >=9%；
Pickled product rate of body weight gain >=5% three times.
6. graphite electrode manufacturing process as described in claim 1, which is characterized in that specific heating mode is as follows in S400：
0-400 DEG C, 10 DEG C/min；
401-800 DEG C, 15 DEG C/min；
801-1500 DEG C, 25 DEG C/min；
1501-3000 DEG C, 40 DEG C/min.
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| CN101980583A (en) * | 2010-11-03 | 2011-02-23 | 天津锦美碳材科技发展有限公司 | Method for preparing graphite electrode of quartz crucible |
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