CN1030161C - Manufacture method of super-power graphite electrode and its special extrusion equipment - Google Patents
Manufacture method of super-power graphite electrode and its special extrusion equipment Download PDFInfo
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Abstract
The present invention relates to a technology and a device for producing graphite electrodes with ultrahigh power. The present invention has the following technology flows: pre-breaking, sieving, soaking and impregnating in gas, kneading, forming secondarily, roasting, impregnating, graphitizing and mechanically processing raw materials and obtaining a product. In the process step of soaking and impregnating raw materials in gas, an impregnating agent used for the raw materials and a roasted electrode blank is high-temperature coal pitch. In the process step of forming, a secondary forming method is adopted: firstly, a non-equidistant spiral continuous extruder is utilized to form for the first time; then, vibration forming is carried out to realize the purpose of manufacturing graphite with major diameter and ultrahigh power by a small device. The present invention has the advantages of simple technology, cost saving and good product quality.
Description
The present invention relates to the electrode field, particularly the manufacture method of ultra high power graphite electrode and special-purpose extrusion equipment thereof.
Modern steel-smelting electric furnace develops rapidly to big capacity, high power, but the each melting amount of maximum electric furnace has reached 500 tons.Along with the increase of furnace volume, general graphite electrode and high power graphite electrode can not satisfy the requirement of steel industry.Therefore, the development of major diameter ultra high power graphite electrode and production just seem urgently day by day.At present as follows for the quality requirement of ultra high power graphite electrode:
1) the ratio resistance of electrode is little, at 5～7 Ω mm
2In/m the scope;
Allow current density greater than 30A/cm when 2) electrode uses
2;
3) thermal coefficient of expansion of electrode is little, and rupture strength is high and the consumption of ton steel electrode is few.
The method for making of common graphite electrode and high power graphite electrode is as follows: raw material → precrushing → screening → adding mixes as the medium temperature coal pitch of binding agent and pinches → moulding → roasting → dipping → roasting again → and dipping → graphitization → machining → graphite electrode finished product again.Wherein, said dipping operation is: baked molded surface is cleaned out, after being preheating to 150～200 ℃, medium temperature coal pitch with 180～200 ℃ of fusings in the pressure pan that sealing vacuumizes adds a little coal tar dipping, to soaking jar pressurization clearly, make in the coal tar pitch infiltration system roasting moulding product and go again.Because use medium temperature coal pitch to do binding agent and impregnating agent, the coking carbon residue is low, softening point is low, and volatile content is many, thereby the electrode mechanical strength is low, and density is low.
In molding procedure, extrusion, die pressing, vibration moulding method and isostatic compaction method are generally arranged, it is best with extrusion to produce graphite electrode, because the extruded product quality is even.Yet, when the graphite electrode moulding, often because the extruder design is unreasonable, thereby the preferred orientation degree deficiency of gained extruded product, the goods anisotropy is not obvious, thereby direction conductivity deficiency, and density is low; Simultaneously, need the large-tonnage extruder could make the major diameter electrode.
Using high pressure in the dipping operation is in order to reduce the electrode porosity, to improve density, coal tar pitch being permeated into.But because the electrode volume of big specification product such as φ 750mm is bigger, the viscosity of mid temperature pitch is high again, thereby is difficult for soaking into, carry out double-steeping and calcining process so have to, the carbon yield of medium temperature coal pitch is low, only is 45～50%, therefore, the density of gained electrode product is low, and is of poor quality.
Because above the deficiencies in the prior art, the long-pending rich experiences of studying and producing graphite electrode for many years of applicant through experiment in many ways, are finished the present invention finally.
The object of the invention is: a kind of manufacture method of ultra high power graphite electrode and special-purpose extrusion equipment thereof are provided, utilize this method to produce to have littler than resistance, allow the major diameter steel-making graphite electrode that current density is big, thermal coefficient of expansion is little, rupture strength is high when using.
The present invention seeks to reach like this: adopted new process route, promptly raw material → precrushing → screening → gas soaks and adds dipping → mixed pinching → post forming → roasting → dipping → graphitization → machining → graphite electrode finished product.Wherein, operation is soaked and flooded to insertion to the gas of raw material after raw material precrushing and screening and between the kneading process; Use the high temperature coal tar pitch to make binding agent in the dipping operation before graphitization process; In molding procedure, adopt the post forming method, the thickener that at first will mix after pinching carries out one-step forming just in the spiral continuous extruder, forming temperature is 200 ± 20 ℃, in this screw extrusion machine drum body, be provided with heating collar, the conduction oil that wherein has 240～280 ℃ is by heating thickener, and extrusion ratio is 8～16, and the mouthpiece apex angle is 45 °, mouthpiece moulding straight line portion h is 4 times of product diameter d, obtains the electrode base less than the 200mm diameter; Above-mentioned one-time formed semi-finished product are directly carried out vibration moulding in vibrating forming machine, time of vibration is 10 minutes, and amplitude 60 times/second vibrates the demoulding cooling that finishes, and enters next step and fuses operation.
The dedicated extruded equipment of major diameter ultra high power graphite electrode is to use the unequal distant screw continuous extruder, this machine is by cylindrical shell, heating collar, helical axis, spiral, conehead, mouthpiece are formed, the unequal distant screw axle length overall 2000～2100mm that has conehead, the length of spiral part is 1100～1200mm, helical axis 105～115mm, spiral external diameter 190～200mm, the conehead tapering is 60 °, the pitch of successively decreasing tmax=130mm; Tmin=92mm, mouthpiece apex angle=45 °, mouthpiece moulding straight line portion h is 4 times of product diameter d, and helix angle β ° is 105, and by above method and apparatus, the object of the invention has just reached fully.
The present invention is described in detail below in conjunction with accompanying drawing;
Accompanying drawing 1 is a prior art operation block diagram;
Accompanying drawing 2 is operation block diagrams of the inventive method;
Accompanying drawing 3 is the dedicated extruded former schematic diagrames of the present invention;
Accompanying drawing 4 is helicoid A-A sectional views in the extrusion formation equipment shown in the accompanying drawing 3.
Accompanying drawing 1 is the prior art block diagram, and its flow process is the dipping → graphitization → machining → graphite electrode finished product of raw material → precrushing → screening → kneading → moulding → roasting → dipping → again roasting → again.
Flow process of the present invention as shown in Figure 2, its flow process is: raw material → precrushing → screening → gas soaks and adds dipping → kneading → moulding → roasting → dipping → graphitization → machining → graphite electrode finished product.
Raw material of the present invention adopts as Japanese needle coke and autoclave 0.5 high-quality oil coke in the low petroleum coke of ash content. Wherein, Japanese needle coke accounts for batching 70 ± 5%, and autoclave 0.5 high-quality Jiao accounts for 30 ± 5% or add a small amount of pitch coke, and the needle coke coke button is little, and cell size is even, degree of orientation height during graphitization, and the pad coefficient of expansion is little, and resistivity is lower; Autoclave 0.5 high-quality oil coke, contained ash content is less than 0.5%. Raw material screens through precrushing, and food ingredient accounts for 30 ± 5% for the macroparticle siccative, and middle material siccative accounts for 30 ± 5%. Powder 40 ± 5% carries out gas to this material and soaks. It is under 220～250 ℃ hot conditions that said gas soaks, with the gun spraying of miscella high temperature oil, the per 100 parts of material of the consumption of this miscella and proportional quantity, macroparticle siccative comprising aforementioned proportion, middle material siccative and powder, with 3 parts of kerosene, 1 part of coal tar and 1 part of carbolineum, gas soaks the lipophile that can improve raw material to be made the coke raw material be easy to carry out the impregnation process in lower step and obtains good dipping effect.
So-called impregnating agent is the coal tar pitch that can fill up pore in raw material or the roasting semi-finished product. The existence of pore is bigger to the properties of product impact, bulk density then descends when the porosity of product increases, resistivity rises, mechanical strength reduces, oxidation rate is at a certain temperature accelerated, corrosion resistance also degenerates, dipping can make the porosity of raw material or product reduce, thereby improve product quality, general dipping process is only after calcining process, the present invention then is implemented on dipping process the macroparticle siccative that accounts for total stuff amount 30 ± 5% after gas soaks and accounts for the middle particle siccative of total stuff amount 30 ± 5%, carries out then single-steeping after roasting again. This dipping process is same as the prior art, but with coal tar pitch as impregnating agent, wherein, the particle siccative of wish dipping is added guipure puts into impregnating autoclave, vacuumize, the dipping coal tar pitch of injection heating to 250 ℃ then, 8～10kg/cm pressurizes in impregnating autoclave2, pressurization kept 5～10 minutes, the rear compressed air purging of using that is disposed, and cold rear taking-up is weighed, and rate of body weight gain is 9～13%. The prior art medium temperature coal pitch, 65～90 ℃ of softening points, and the present invention adopts coal tar pitch, 100～145 ℃ of its softening points. After roasting take medium temperature coal pitch person's carbon residue rate of doing impregnating agent as 45～50%, and the coal tar pitch person that does impregnating agent, the carbon residue rate after roasting then brings up to 50～70%, thereby improves product density, improves the quality of products. The impregnating pitch consumption generally is 17 ± 3% of siccative.
The macroparticle siccative that adds dipping through above-mentioned air infiltration, middle material siccative and mix in kneading machine through the powder that gas soaks and to pinch, coal tar pitch is further soaked into the charcoal crude granule, stir, obtain the plasticity thickener after the mixing, through kneading process, coal tar pitch is penetrated in the feed particles hole, improve its caking property and compaction rate, the proportion of the thickener of Sheng Chaning can reach 1.65～1.70 gram/cubic centimetres like this, and plastics are good, be convenient to moulding, the rate of finished products height of moulded products, and not through the thickener as the present invention's processing, its apparent specific gravity (gd) only is 1.45～1.55 gram/cubic centimetres.
After mixed the pinching thickener is carried out moulding, molding character of the present invention is to adopt the post forming method, earlier tentatively being shaped to minor diameter electrode base with the spiral continuous extruder, carrying out vibration moulding then, is big specification φ 350～φ 750mm electrode finished product with minor diameter electrode blank molding.
The extrusion modling process is in order the molecular long axis of carbon materials to be adjusted to a direction, to be improved the product anisotropy.Feature after the extrusion modling of the present invention is continuity and improves the product anisotropy.General tamping plant has hydraulic press, hydraulic press etc., but extrusion process is discontinuous, and the product anisotropy is relatively poor.The present invention adopts the unequal distant screw continuous extruder, pushes under 200 ± 20 ℃ heating, and heats in heating collar with conduction oil.In order to obtain good anisotropy, improved the running parameter of extruder, wherein, extrusion ratio is 8～16, the mouthpiece apex angle is 45 °, and mouthpiece moulding straight line portion h is 4 times of product diameter, as shown in Figure 3, when thickener when the loudspeaker mouthpiece outwards is extruded, because of the straight part of squeezing is not subjected to side force, and the both sides thickener is subjected to side force, thereby forces the major axis of stressed molecule to be extruded along the direction of longitudinal force, so the surface molecular of entire product is arranged in order, the direction conductivity on surface increases.Less than 8, then pole strength is not enough as extrusion ratio, greater than 16, then extrudes not smooth as extrusion ratio; The mouthpiece drift angle is as greater than 45 °.Or, all make thickener suffered side force in both sides little, thereby anisotropy is relatively poor less than 45 °; Mouthpiece moulding straight line portion is as less than 4 times of product diameter, then product as yet not compacting enough promptly be extruded, easy deformation, product strength is relatively poor; If mouthpiece moulding straight line portion is greater than 4 times of diameter, then frictional force increases, and influences production efficiency.It is the following minor diameter extruding of 200mm electrode base that first one-step forming can obtain diameter.Above extrusion modling of the present invention is carried out under 200 ° ± 20 ℃ of high temperature, in the screw extruder shell, be provided with heating collar, in this cover, there is 240～280 ℃ conduction oil to pass through, make thickener remain on 200 ± 20 ℃ of temperature, this is because gas soaks and the used impregnating agent of dipping that floods in the operation is the high temperature coal tar pitch, the softening point of high temperature coal tar pitch is 100～145 ℃, therefore more than softening point, carry out extrusion modling, can make coal tar pitch fully be penetrated into the feed particles hole goes out, improve the compaction rate of electrode base, so must use high temperature heat conductive oil that thickener is heated, this conduction oil is a Yanshan Petrochemical research institute product, the trade mark is VD300,240～280 ℃ of specified serviceability temperatures.Coal tar pitch is the Residual oil of coal tar after the high temperature fractionation, and the macromolecule arene compound amount height of high temperature coal tar pitch, volatile matter is few, coking carboloy residue height, thus further improve end product quality.At the extruding electrode base diameter of spiral continuous extruder less than 200mm, the little requirement that can not satisfy the steel-making graphite electrode of its diameter, and the big required pressure of specification product is big, because big specification electrode needs large-size extruder, production cost is too expensive, so adopt minor diameter electrode base is focused on a place, uses the vibration moulding method again, make the major diameter graphite electrode of φ 350～750mm, have typing, high density and directed three kinds of advantages.
Press prior art through roasting, dipping, graphitization and machining through the graphite electrode semi-finished product of overmolding, obtain finished product.As long as the present invention bakes to burn the article and dipping, does not need roasting again and dipping again after molding procedure, the minimizing operation, and in addition, used binding agent is the high temperature coal tar pitch in flooding operation, puts into the coal tar pitch that is heated to 220～250 ℃ and flood in impregnation tank.And general dipping uses medium temperature coal pitch, and adding is that temperature is 160～180 ℃ a coal tar pitch in soaking clearly jar.Thereby the high temperature coal tar pitch is easier to immerse in the graphite micropore, improves the mechanical performance and the density of finished product to greatest extent.
The extrusion equipment of special use of the present invention is not equidistant spiral continuous extruder, this machine is made up of extruder, motor 1, gear wheel 2,6, pinion 5, bearing pedestal 3, power transmission shaft 4, bearings backup plate 7 etc., and the extruder body comprises cylindrical shell 10, heating collar 11, helical axis 12, helicoid 15, conehead 13, mouthpiece straight line moulding section 14, cylindrical shell end cap 8, charge door 9.The unequal distant screw axial length 2000～2100mm that has conehead, best 2038mm, the length of spiral part is 1100～1200mm, best 1140mm, the spiral diameter of axle 105～115mm, preferably 110mm, spiral external diameter 190～200mm, best 192mm, the conehead tapering is 60 ℃, the pitch of successively decreasing tmax=130mm, tmin=92mm, helix angle β is 105 °, and the mouthpiece apex angle is 45 °, and mouthpiece moulding straight line portion h is 4 times of product diameter d.
Before equipment starts, should heat to cylindrical shell with conduction oil earlier, barrel temperature does not allow to be lower than 230 ℃ should reach 230～250 ℃, mouthpiece and barrel temperature are consistent, send then and establish car by cable, drive pinion 5 by motor 1, drive gear wheel 2 again, the gear driven extruder is rotated by another by power transmission shaft 4 again, with thickener continuously from charge door 9 chargings, the about 2.5kg/ of charging rate minute, extrusion speed 4kg/ minute, obtain fine and close extruding electrode base, directly enter without cooling with this electrode base and be shaped to the major diameter electrode in the vibrating forming machine.
Screw extruder of the present invention has lot of advantages, this screw extruding bri quetting is to add the hot thickener with dipping temperature continuously, be compacted gradually along with the rotation of unequal distant screw axle, and constantly discharge glance coal and part air, all molding times are used in extruding program itself entirely, thereby output can be 2～3 times of make-up machine such as hydraulic press.In forming process without the cold material, thickener with dipping humidity adds in the spiral cylindrical shell 10 continuously, be provided with heating tube 11 in the cylindrical shell inboard, wherein there is conduction oil to flow, thickener is heated, thickener is and then made fast rotational in cylindrical shell, because spiral is not equidistant, increase gradually so thickener bears pressure when moving forward, this process is equivalent to the kneading process again that carries out under pressurized gradually, make the thickener composition more even, and the infiltration that makes interior particle material of thickener and powder internal voids be subjected to binding agent basically, again because when thickener was compacted gradually in continued operation, because the discharge of glance coal and air, internal stress reduced greatly, pore reduces, the rapid increase of ratio pressure of mouthpiece part simultaneously, these reasons make the roasting product density of the goods that this machine extrudes big, the mechanical strength height.This machine has not only been simplified complicated huge former, has also saved the labour, and can produce the carbon products of various different sizes.
Meeting the requirement of ultra high power graphite electrode with the inventive method and the prepared graphite electrode of equipment, wherein, is 5～7 Ω mm than resistance
2Allow current density greater than 30A/cm when/m, electrode use
2, bulk density 1.65～1.75 gram/cubic centimetres, rupture strength: perpendicular to direction of extrusion person 8.83～17.66 * 10
3MPa is parallel to direction of extrusion person 7.85～13.73 * 10
3It is 0.5～1.0 * 10 that MPa, thermal coefficient of expansion (20～200 ℃) are parallel to the direction of extrusion
-6/ ℃, perpendicular to the direction of extrusion 3.0～4.0 * 10
-6/ ℃.The inventive method adopts simple device to produce big specification ultra high power graphite electrode for making steel, work simplification, and with low cost, product quality is superior.
Embodiment:
To produce φ 500mm graphite electrode is example.Raw material adopts the calcining back to mix oil coke, wherein contains Japanese needle coke 65%, still formula 0.5 high-quality Jiao 25%, pitch coke 10%; The macroparticle siccative (2～6mm) 30% in batching, middle particle siccative (1～2mm) 30%, powder (＜0.075mm) 40%, carry out gas then respectively and soak and flood operation, earlier raw material being put into gas soaks and jar carries out gas and soak, it is the macroparticle siccative, middle particle siccative or powder all carry out gas and soak and use miscella to carry out gas to soak, per 100 kilograms of raw materials use miscella 5kg, wherein kerosene accounts for 3% of raw material, coal tar accounts for 1% of raw material, carbolineum accounts for 1% of raw material, with the high pressure oil gun miscella is sprayed into gas and soak jar, vaporific miscella is fully contacted with raw material, keep taking out after 10 minutes.Macroparticle material after according to the above ratio gas being soaked and middle particle material are put into the material net and are put into impregnation tank again after preheating, vacuumize, when reaching 88000Pa, vacuum kept 45 minutes, in jar, put into the high temperature coal tar pitch that is heated to 250 ℃ then, bituminous sheaths is 150mm at least above the product top, use pressurized with compressed air then, pressure is 8kg/cm
2, pressurizeed 10 minutes, impregnating agent is returned, use the compressed air purge, cooling is taken out and is weighed, and obtaining rate of body weight gain is 11%.
Gas is soaked pellet behind powder and the dipping put in proportion to mix and pinch pot and mix and pinch, mix and pinch taking-up after 45 minutes, kneading temperature is 250 ℃.
The moulding program is divided into one-shot forming and post forming.Earlier be that 250 ℃ thickener adds the equidistant spiral shell that has kept 250 ℃ and revolves continuously in the cylindrical shell of extruder and carry out one-shot forming with temperature, barrel temperature is 260 ℃, one-shot forming product diameter is 100mm, length is 1250mm, 26 of moulding, extrusion ratio is 12, extrusion speed 4kg/ minute, and charging rate 2.5kg/ minute;
The electrode of one-time formed φ 100 is put into the mould that presets of φ 518mm rapidly, die length is 1760mm, on the vibration moulding board, carry out vibration moulding with electroded mould is horizontal then, time is 10 minutes, amplitude 60 times/second, vibration finishes, and the demoulding, cooling obtain the graphite electrode base of φ 500mm.
Roasting is carried out according to 520 hours sintering temperature curves of prior art, 1000 ℃ of maximum temperatures,
Dipping operation and above-mentioned gas soak that to add the operation of flooding in the operation identical, just flood object and be not raw material but electrode base after the roasting.In impregnation tank, be evacuated down to the 650mm mercury, kept 45 minutes, when impregnation tank is warmed up to 250 ℃, add, be pressurized to 10kg/cm subsequently with the high temperature coal tar pitch that is heated to 250 ℃
2, the time is not less than 4 hours, and the dipping back is taken out and is used the compressed air purge, and cooling off the rate of body weight gain of weighing is 12%.
Graphitization processing: it is 300 kilowatts that heating furnace begins power, and per hour ascending power is 20 kilowatts, freely rises after 60 hours, and maximum temperature reaches 2700 ℃ of insulations 4 hours;
Machining: electrode diameter 500mm, length 1700mm.The gained electrode performance reaches the requirement of ultra high power graphite electrode.
Claims (3)
1, the manufacture method of major diameter ultra high power graphite electrode has following sequenced step: raw material → precrushing → screening → mix and pinch → moulding → roasting → dipping → graphitization → machining → graphite electrode finished product is characterized in that:
A) adding gas to raw material between raw material fragmentation and screening process and kneading process soaks and adds the dipping operation, wherein said gas soak be to the macroparticle siccative that accounts for 30 ± 5% in the raw material, account for 30 ± 5% middle particle siccative and account for 40 ± 5% powder, under 220～250 ℃ of conditions respectively with the gun spraying of miscella high temperature oil, the consumption and the proportioning of this miscella are: per 100 parts of material are with 3 parts of kerosene, 1 part of coal tar and 1 part of carbolineum; Then gas is soaked the back and put into the inherent impregnation tank of material net by the macroparticle material of proportioning and middle particle material and flood, used impregnating agent is that softening point is 100～145 ℃ a high temperature coal tar pitch, then three kinds of raw materials is carried out kneading process again by proportioning;
B) in forming step, adopt two one-step forming methods, the thickener that at first will mix after pinching carries out one-step forming just in the unequal distant screw continuous extruder, promptly under 200 ± 20 ℃, carry out extrusion modling, be provided with heating collar at this screw extrusion machine drum body, in this heating collar, have 240～280 ℃ conduction oil to pass through, thickener is heated, extrusion ratio is 8～16, mouthpiece apex angle=45 °, mouthpiece moulding straight line portion h is 4 times of product diameter d, obtains the electrode base less than the 200mm diameter; Above-mentioned one-time formed semi-finished product are directly carried out vibration moulding in vibrating forming machine, time of vibration 10 minutes, amplitude vibrate the demoulding cooling that finishes at 60 times/second, and the electrode base that obtains diameter 350～750mm enters next step calcining process;
C) the electrode base after the roasting is flooded used impregnating agent is that softening point is 100～145 ℃ a high temperature coal tar pitch in the operation.
2, the dedicated extruded equipment of making the major diameter ultra high power graphite electrode comprises extruder, motor, gear wheel, pinion, bearing pedestal, power transmission shaft, it is characterized in that: said extruder is the unequal distant screw continuous extruder, this machine is by cylindrical shell, heating collar, helical axis, spiral, conehead, mouthpiece is formed, the unequal distant screw axle length overall 2000～2100mm that has conehead, the length of spiral part is 1100～1200mm, the spiral diameter of axle 105～115mm, spiral external diameter 190～200mm, the conehead tapering is 60 °, helix angle β is 105 °, the mouthpiece apex angle is 45 °, and mouthpiece moulding straight line portion h is 4 times of product diameter d.
3, according to the dedicated extruded equipment of the said manufacturing ultra high power graphite electrode of claim 2, it is characterized in that: the unequal distant screw axle length overall 2038mm that has conehead on the unequal distant screw extruder, the length of spiral part is 1140mm, and helical axis 110mm, spiral external diameter are 192mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106998 CN1030161C (en) | 1993-06-17 | 1993-06-17 | Manufacture method of super-power graphite electrode and its special extrusion equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106998 CN1030161C (en) | 1993-06-17 | 1993-06-17 | Manufacture method of super-power graphite electrode and its special extrusion equipment |
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| CN1082805A CN1082805A (en) | 1994-02-23 |
| CN1030161C true CN1030161C (en) | 1995-10-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101980583B (en) * | 2010-11-03 | 2012-04-04 | 天津锦美碳材科技发展有限公司 | Method for preparing graphite electrode of quartz crucible |
| CN102249680B (en) * | 2010-12-20 | 2014-01-08 | 福建兴朝阳硅材料股份有限公司 | Preparation method of hollow graphite electrode |
| CN102310463B (en) * | 2011-06-03 | 2013-06-05 | 河南三力炭素制品有限公司 | System and method for producing graphite electrode pressed four-process temperature equalized paste |
| CN102363525B (en) * | 2011-07-01 | 2013-01-23 | 中国平煤神马集团开封炭素有限公司 | Dry material heater |
| CN102364989A (en) * | 2011-07-01 | 2012-02-29 | 中平能化集团开封炭素有限公司 | Ultra-high power graphite electrode nipple with diameter of 318mm and production method thereof |
| CN102778132A (en) * | 2012-08-14 | 2012-11-14 | 沈林彬 | Rotary-type auger delivery electrode for adding powder in center of electric furnace |
| CN103009466B (en) * | 2012-12-04 | 2014-11-19 | 太原重工股份有限公司 | Nozzle of carbon extruding machine |
| CN109454917B (en) * | 2018-11-23 | 2020-09-15 | 大同新成新材料股份有限公司 | Ultrahigh-power graphite electrode profiling equipment with impregnation function and profiling method thereof |
| CN115466121A (en) * | 2022-10-28 | 2022-12-13 | 万基控股集团石墨制品有限公司 | Preparation method of graphite electrode |
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