CN102363526A - Ultra high power graphite electrode with its diameter being 650mm and production method thereof - Google Patents
Ultra high power graphite electrode with its diameter being 650mm and production method thereof Download PDFInfo
- Publication number
- CN102363526A CN102363526A CN2011101530641A CN201110153064A CN102363526A CN 102363526 A CN102363526 A CN 102363526A CN 2011101530641 A CN2011101530641 A CN 2011101530641A CN 201110153064 A CN201110153064 A CN 201110153064A CN 102363526 A CN102363526 A CN 102363526A
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- high power
- diameter
- curve
- graphite electrode
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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- 239000010439 graphite Substances 0.000 title claims abstract description 32
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 239000011331 needle coke Substances 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 4
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- 238000000034 method Methods 0.000 claims description 16
- QIQXTHQIDYTFRH-UHFFFAOYSA-N Stearic acid Chemical compound 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Abstract
An ultra high power graphite electrode with its diameter being 650mm and a production method thereof. The ultra high power graphite electrode with its diameter being 650mm is made from imported oil needle coke. Through detection, the volume density, bending strength, elastic modulus, resistivity and thermal expansion coefficient of the product all reach international standard. Therefore, the present situation that our nation's ultra high power graphite electrode for arc furnace steel-making with the diameter of the electrode being 650mm completely depends on importation can be solved; the foreign carbon enterprise monopoly on domestic 650mm-diameter ultra high power graphite electrode market is broken; and the gap that the ultra high power graphite electrode with its diameter being 650mm can not be produced in our nation is filled.
Description
Technical field
The present invention relates to a kind of Graphite Electrodes and working method thereof, particularly diameter 650mm ultra-high power graphite electrode and working method thereof.
Background technology
The big specification ultra-high power graphite electrode major dimension of domestic production at present has ￠ 500mm, ￠ 550mm, ￠ 600mm, does not also have enterprise can produce ￠ 650mm ultra-high power graphite electrode.But development along with domestic iron and steel enterprises; It is bigger that most of steel mills have built up capacity; The electric arc furnace that electric current and voltage are higher; Therefore requiring has larger diameter, can stand more that the ultra-high power graphite electrode of high current density matches, and especially the demand to ￠ 650mm ultra-high power graphite electrode presents the situation that increases rapidly.The whole dependence on import of ￠ 650mm ultra-high power graphite electrode that present domestic steel mill uses, so my company researched and developed the technology of the complete production ￠ 650mm ultra-high power graphite electrode of a cover, to change the situation of the complete dependence on import of this products.
Produce ￠ 650mm ultra-high power graphite electrode and have bigger difficulty: (1) Formula Design development difficulty is bigger.Because ￠ 650mm ultra-high power graphite electrode diameter is bigger, the proportioning that needs granularity in its prescription of corresponding adjustment lowers resistivity to improve its volume density, strengthens heat-shock resistance, improves antioxidant property; (2) design of curve in the roasting process.Because the siccative prescription all changes with asphalt content in the pressure-type process, ￠ 650mm ultra-high power graphite electrode diameter has had bigger increase simultaneously, so needs the temperature rise rate of corresponding change roasting curve, key temperatures control interval, prolongation roasting time during roasting; (3) adjustment of greying curve.Same because ￠ 650mm ultra-high power graphite electrode diameter has had bigger increase, in the greying transmission process, need corresponding increase to send electric weight, so that roasting product reaches physicochemical property parameters such as ideal degree of graphitization, resistivity, anti-folding.
Summary of the invention
The object of the present invention is to provide a kind of diameter 650mm ultra-high power graphite electrode and working method thereof, the present invention has filled up domestic blank, and this product quality indicator and use properties all can meet international standards.
Product diameter 650mm ultra-high power graphite electrode of the present invention is to be that needle coke is a raw material with import oil; Its concrete prescription comprises: volume particle size oil is needle coke, middle granularity coal-based needle coke and the molecular siccative of small grain size powder, and sticker, additive, give birth to broken and the broken component of roasting, pinch through crushing and screening, prepare burden, mixing, moulding, roasting, dipping, greying, processed finished products operation process.This compound composition count by weight percentage for: the volume particle size oil in the siccative is that needle coke 45%, middle granularity oil are needle coke 10%, small grain size powder 45%; Sticker accounts for the 25-30% of siccative gross weight, the 0.5-0.8% that the Triple Pressed Stearic Acid in the additive accounts for the siccative gross weight, Fe
2O
3Iron powder account for the dry powder gross weight 0.5%, give birth to broken account for the siccative gross weight 5%, broken 5% of the siccative that accounts for of roasting.Described sticker is middle temperature modified pitch; The granularity that described volume particle size oil is needle coke is 20-30mm, and middle granularity oil is that needle coke is 10-20mm, and small grain size powder is 200 order powder.
Its working method comprises following process step:
(1), system electrode raw product: with raw oil is the granularity that needle coke is pulverized and sieved into the large, medium and small different size of regulation; Getting into automatic batching system prepares burden; Make siccative; Automatically be discharged into kneading machine after siccative is heated to 185-200 ℃, add binder pitch, additive Triple Pressed Stearic Acid and Fe
2O
3Iron powder mixes under 185-200 ℃ kneading temperature and pinches and kept 18 minutes, makes thickener; This thickener water spray is cooled to 130-140 ℃ enters press; Press vacuumizes under the thermal thermal temperature of design, and its suction≤20mmHg makes firm by ramming at 1500 tons and to fiddle with under the pressure and kept 12 seconds; With main plunger speed is that the extrusion speed that 60mm/ divides pushes, and makes volume density>=1.72g/cm
3, re-shearing obtains meeting the raw product of technical requirements, and is for use.
(2), roasting, dipping: the roasting of packing into of above-mentioned raw product for use is irritated, and in roasting is irritated, lays stopping composition by the technical requirements of regulation, accomplish the tinning operation after; Sending into stoving oven and carry out the roasting heat processing, in the heat treated process of roasting, is that the bakes to burn the article curve automatically performs intensification by the heating curve of stipulating; Be warming up to 900 ℃ of top temperatures gradually, naturally cooling to 200 ℃ again and come out of the stove, accomplishing the bakes to burn the article operation; Then carry out Shot Blasting, after carrying out the high-pressure impregnation processing under the 10-15bar pressure, carry out re-baking according to the re-baking curve again with impregnating pitch with shot-blasting machine; Obtain qualified roasting product, for use.
(3) graphitization processing: above-mentioned greying article technical requirements according to the rules for use is tested, be processed into the finished product of regulatory specifications,, assemble in advance, pack, put in storage by the coupling requirement of regulation again through strict index and size detection.
Described power-supply curve is to be the ultra-high power graphite electrode of needle coke system diameter 650mm specification according to import oil; When in internal thermal serial graphitized stove, carrying out graphitization processing; Because the higher characteristics that are easy to generate inflatable of sulphur content; Critical stage 1600-2100 ℃ of internal thermal serial graphitized feeding temperature-raising carried out temperature and displacement measurement, according to graphitizing process in the pucker & bloat principle of differing temps stage goods, and design be used for the greying song power-supply curve that import oil is needle coke system diameter 650mm specification ultra-high power graphite electrode.The technical requirements of this greying power-supply curve is: diameter 650mm roasting product, single-column shove charge, 29 tons/stove, initial power 3600KW send electric duration 13 hours, plan current consumption 98400KW.This greying power-supply curve is following:
The greying power-supply curve
Described bakes to burn the article curve is following:
The bakes to burn the article curve
Described re-baking curve is following:
The re-baking curve
The present invention adopts technique scheme, and utilizing import oil is that needle coke is produced the big specification ultra-high power graphite electrode of diameter 650mm, and through detecting, the volume density of this electrode is 1.73g/cm
3, folding strength is 11.9Mp, and Young's modulus is 8.76Gpa, and resistivity is 3.72 μ Ω m, and thermal expansivity is 1.2 * 10
-6/ ℃, meet international standards fully.Thereby can fill up the domestic blank that can not produce diameter 650mm ultra-high power graphite electrode, break the situation of domestic steel mill with the complete dependence on import of diameter 650mm ultra-high power graphite electrode.
120 tons of electric arc furnace of product certain domestic Iron And Steel Company of the present invention are on probation; Result on trial is: the steel-making unit consumption is respectively 1.21 kilograms of/ton steel; Satisfy user's requirement fully; The loss per ton steel of test electrode is on close level with external inlet electrode, this shows that product of the present invention has reached world level.
Description of drawings
Fig. 1 is the process flow sheet of diameter 650mm ultra-high power graphite electrode and working method thereof.
Embodiment
Describe embodiment of the present invention in detail below in conjunction with embodiment.
Product of the present invention is that to utilize import oil be needle coke; Microtexture, true density, thermal expansivity, tap density, shatter strength and oil according to needle-shape coke raw material are the absorption property of needle coke to modified pitch, and the prescription of the ultra-high power graphite electrode of the large, medium and small granularity grade of design.This prescription comprises that 20-30mm volume particle size oil is that granularity oil is that needle coke reaches less than the molecular siccative of 200 purpose small grain size powder, sticker modified pitch, additive Triple Pressed Stearic Acid and Fe among needle coke, the 10-20mm
2O
3Iron powder; Give birth to the broken and broken component of roasting, said composition is counted by weight percentage: 20-30mm volume particle size oil is needle coke 45%, and middle granularity oil is needle coke 10%; Less than 200 purpose small grain size powder 45%; The sticker modified pitch accounts for the 25-30% of siccative gross weight, and the additive Triple Pressed Stearic Acid accounts for the 0.5-0.8% of siccative gross weight, additive Fe
2O
3Iron powder accounts for 0.5% of siccative gross weight, give birth to broken account for the siccative gross weight 5%, broken 5% of the siccative that accounts for of roasting.
Working method of the present invention comprises following process step:
(1), system electrode raw product: with raw oil is that needle coke is positioned in the Suspension roller pulverizing mill and pulverizes; Sieve out 20-30mm volume particle size oil and be among needle coke, the 10-20mm granularity oil and be needle coke and less than 200 purpose small grain size powder; By fromula ratio needle coke, powder of the large, medium and small granularity of above-mentioned screening are sent into automatic batching system again; Carry out automatic mix and become siccative, this siccative is heated to 185-200 ℃ through preheater, is discharged into Ai Li automatically and is permitted kneading machine; The sticker molten asphalt that adds fromula ratio again, and the additive Triple Pressed Stearic Acid and the Fe of fromula ratio
2O
3Iron powder mixes under the 185-220 temperature and pinches, and kept 18 minutes, mixes and pinches into thickener; The thickener water spray is cooled to 130-140 ℃, enters 3000 tons of upright pressure oil presses that crouch of smashing, this oil press vacuumizes under the thermal thermal temperature of design; Its vacuum tightness≤20mmHg, vacuum kept 100 seconds, made firm by ramming under the pressure at 1500 tons and made firm by ramming; And pressurize 12 seconds, divide extrusion speed to push with main plunger speed 60mm/ again, produce volume density>=1.72g/cm
3The die mould article, shear, obtain to meet the electrode raw product of technical requirements, for use.
(2), roasting, dipping: the single roasting of packing into of above-mentioned electrode raw product for use is irritated, in roasting is irritated, lay stopping composition, reach the purpose of secluding air and uniformly transfer heat according to the technical requirements that stopping composition is laid; Tinning is accomplished, and is pushed by waggon and carries out roasting heat processing, the temperature-rise period in this heat treatment process in the car bottom furnace; Be to be that the bakes to burn the article curve automatically performs intensification,, naturally cool to 200 ℃ again and come out of the stove when being warming up to 900 ℃ of top temperatures gradually according to the heating curve of setting; Accomplish the bakes to burn the article operation, then carry out shot peening, add impregnating pitch again with shot-blasting machine; After carrying out the high-pressure impregnation processing under the 10-15bar pressure; Then carry out re-baking according to the re-baking curve, the electrode baking article that acquisition conforms to quality requirements, for use.
(3), graphitization processing: with above-mentioned electrode baking article process flush end operation for use; Pack in the internal thermal serial graphitized stove of " U " type according to the head and the tail ways of connecting again, and covering insulation material, the shove charge operation accomplished; Send electric graphitization processing according to the power-supply curve of setting again; This treatment temp reaches as high as 3000 ℃, obtains qualified greying article, and according to the rules these greying article is tested.
(4), processed finished products: with above-mentioned greying article through test; Pass through numerical control machine tool; Be processed into the finished product of diameter 650mm * long 2700mm specification; After carrying out strict index and size detection again, require to assemble in advance, pack, put in storage according to accuracy requirement and index coupling with taper joint.
Product of the present invention is through national inspection centers---and Anshan Research Inst. of Heat Energy, China Iron & Steel Group is detected, and small product size density is 1.73g/cm
3, folding strength is 11.9Mp, and Young's modulus is 8.76Gpa, and resistivity is 3.72 μ Ω m, and thermal expansivity is 1.2 * 10
-6/ ℃, meet international standards fully.
Claims (4)
1. diameter 650mm ultra-high power graphite electrode; Comprise by volume particle size oil being that needle coke, middle granularity oil are needle coke and the molecular siccative of small grain size powder; And sticker, additive, give birth to the broken and broken component of roasting, pinch through crushing and screening, prepare burden, mixing, moulding, roasting, dipping, greying, processed finished products operation are processed, said composition is counted by weight percentage: volume particle size oil is needle coke 45%, and middle granularity oil is needle coke 10%; Small grain size powder 45%; Sticker accounts for the 25-30% of siccative gross weight, and the additive Triple Pressed Stearic Acid accounts for the 0.5-0.8% of siccative gross weight, additive Fe
2O
3Iron powder accounts for 0.5% of siccative gross weight, gives birth to broken 5% of the siccative gross weight that accounts for, broken 5% of the siccative that accounts for of roasting, and described sticker is a modified pitch.
2. the working method of diameter 650mm ultra-high power graphite electrode as claimed in claim 1 is characterized in that, this working method comprises following process step:
(1), system electrode raw product: the large, medium and small different size granularity of the raw material coal-based needle coke being pulverized and sieving into regulation; Getting into automatic batching system prepares burden; Make siccative, be discharged into kneading machine automatically after siccative is heated to 185-200 ℃, add binder pitch, Fe
2O
3Iron powder and additive Triple Pressed Stearic Acid mix under 185-200 ℃ kneading temperature and pinch, and kept 18 minutes, process thickener; The thickener water spray is cooled to 130-140 ℃, enters press, press is under the thermal thermal temperature of design; Vacuumize, its vacuum tightness≤20mmHg is to make firm by ramming under 1500 tons the pressure making pressure firm by ramming; And kept for 12 seconds, be that the extrusion speed that 60mm/ divides pushes with main plunger speed, make extruding density>=1.72g/cm
3, shear and make raw product, for use;
(2), roasting, dipping: with the above-mentioned electrode raw product for use roasting pot of packing into, and in roasting pot, lay stopping composition by the technical requirements of regulation, accomplish the tinning operation after; Roasting pot is sent into stoving oven carry out roasting heat and handle, according to the rules bakes to burn the article curve in this roasting heat treating processes automatically performs intensification; Be warming up to 900 ℃ of top temperatures gradually in roasting, naturally cool to 200 ℃ again and come out of the stove, accomplish the bakes to burn the article operation; Then adopt shot-blasting machine to carry out Shot Blasting, after high-pressure impregnation under the 10-15bar pressure is handled, carry out re-baking according to the re-baking curve again with impregnating pitch; Obtain qualified roasting product, for use;
(3), graphitization processing: after above-mentioned roasting product for use process flush end operation; Pack in the internal thermal serial graphitized stove according to the head and the tail ways of connecting, covering insulation material is accomplished the shove charge operation; Send electric graphitization processing according to the power-supply curve of setting again; This treatment temp reaches as high as 3000 ℃, obtains the greying article, and is for use;
(4), processed finished products: with above-mentioned graphitization article for use, after specification requirement is according to the rules tested, be reprocessed into the finished product of regulatory specifications, through the detection of strict index and size, then coupling in accordance with regulations requires to assemble in advance, pack, put in storage.
3. like the working method of right 2 described diameter 650mm ultra-high power graphite electrodes, it is characterized in that described power-supply curve is following:
The greying curve
4. the working method of diameter 650mm ultra-high power graphite electrode as claimed in claim 2 is characterized in that described bakes to burn the article curve is following:
The bakes to burn the article curve
Described re-baking curve is following:
The re-baking curve
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103086364A (en) * | 2012-12-19 | 2013-05-08 | 中国平煤神马集团开封炭素有限公司 | Method for preparing high-strength ultra-high power graphite electrode |
| CN104386669A (en) * | 2014-04-22 | 2015-03-04 | 天津锦美碳材科技发展有限公司 | High-rebound-elasticity porous graphite material and preparation method thereof |
| CN104860678A (en) * | 2015-04-29 | 2015-08-26 | 萝北奥星新材料有限公司 | Method for producing ultra-high power graphite electrode through natural graphite |
| CN107032791A (en) * | 2017-05-11 | 2017-08-11 | 介休市志尧碳素有限公司 | Big specification high power graphite electrode and its manufacture method |
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| CN108751993A (en) * | 2018-06-05 | 2018-11-06 | 大同新成新材料股份有限公司 | A kind of manufacturing process of UHP graphite electrodes |
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| CN110627503A (en) * | 2019-10-24 | 2019-12-31 | 大同新成新材料股份有限公司 | Preparation method of ultrahigh-power graphite electrode |
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| CN101553060A (en) * | 2009-05-07 | 2009-10-07 | 平煤集团开封炭素有限责任公司 | Ultra high power graphite resistor rod with 600mm diameter and method for producing the same |
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| CN101553060A (en) * | 2009-05-07 | 2009-10-07 | 平煤集团开封炭素有限责任公司 | Ultra high power graphite resistor rod with 600mm diameter and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103086364A (en) * | 2012-12-19 | 2013-05-08 | 中国平煤神马集团开封炭素有限公司 | Method for preparing high-strength ultra-high power graphite electrode |
| CN104386669A (en) * | 2014-04-22 | 2015-03-04 | 天津锦美碳材科技发展有限公司 | High-rebound-elasticity porous graphite material and preparation method thereof |
| CN104860678A (en) * | 2015-04-29 | 2015-08-26 | 萝北奥星新材料有限公司 | Method for producing ultra-high power graphite electrode through natural graphite |
| CN107032791A (en) * | 2017-05-11 | 2017-08-11 | 介休市志尧碳素有限公司 | Big specification high power graphite electrode and its manufacture method |
| CN107032791B (en) * | 2017-05-11 | 2020-06-16 | 介休市志尧碳素有限公司 | Large-size high-power graphite electrode and manufacturing method thereof |
| CN108046812A (en) * | 2017-12-12 | 2018-05-18 | 中国平煤神马能源化工集团有限责任公司 | A kind of Delanium crucible and preparation method thereof |
| CN108298984A (en) * | 2017-12-18 | 2018-07-20 | 中国平煤神马集团开封炭素有限公司 | A kind of diameter 750mm ultra high power graphite electrodes and its production method |
| CN108276000A (en) * | 2017-12-18 | 2018-07-13 | 中国平煤神马集团开封炭素有限公司 | A kind of internal thermal tandem graphitization furnace cross-over electrode and its production method |
| CN108751993A (en) * | 2018-06-05 | 2018-11-06 | 大同新成新材料股份有限公司 | A kind of manufacturing process of UHP graphite electrodes |
| CN110316732A (en) * | 2019-04-30 | 2019-10-11 | 大同市新荣区新大科技有限责任公司 | A kind of process carrying out high temperature purification using acheson furnace |
| CN110627503A (en) * | 2019-10-24 | 2019-12-31 | 大同新成新材料股份有限公司 | Preparation method of ultrahigh-power graphite electrode |
| CN111825455A (en) * | 2020-07-02 | 2020-10-27 | 河南昇瑞炭材料科技有限公司 | Production method of UHP phi 650mm ultrahigh power graphite electrode |
| CN114449695A (en) * | 2022-02-16 | 2022-05-06 | 鞍山炭素有限公司 | Ultrahigh-power graphite electrode |
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Application publication date: 20120229 |