CN102364989A - Ultra-high power graphite electrode nipple with diameter of 318mm and production method thereof - Google Patents
Ultra-high power graphite electrode nipple with diameter of 318mm and production method thereof Download PDFInfo
- Publication number
- CN102364989A CN102364989A CN2011101828044A CN201110182804A CN102364989A CN 102364989 A CN102364989 A CN 102364989A CN 2011101828044 A CN2011101828044 A CN 2011101828044A CN 201110182804 A CN201110182804 A CN 201110182804A CN 102364989 A CN102364989 A CN 102364989A
- Authority
- CN
- China
- Prior art keywords
- high power
- graphite electrode
- roasting
- weight
- coal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Carbon And Carbon Compounds (AREA)
- Ceramic Products (AREA)
Abstract
The invention relates to an ultra-high power graphite electrode nipple with the diameter of 318mm and a production method thereof. The ultra-high power graphite electrode nipple with the diameter of 318mm can be produced by using domestic coal series needle cokes with low main physical and chemical index true density and high thermal expansion coefficient and sulfur content to match with a large-size ultra-high power graphite electrode with the diameter of 600mm for use. Experiments prove that the volume density, rupture strength, resistivity and thermal expansion coefficient of the product can reach an international standard, and the problem that the domestic coal series needle cokes cannot be used for producing the large-size ultra-high power graphite electrode because the main physical and chemical index of the domestic coal series needle cokes is low is solved, therefore, the localization of main raw materials of the ultra-high power graphite electrode nipple is realized. According to the invention, production cost can be reduced and economic benefit is improved.
Description
Technical field
The present invention relates to a kind of graphite electrode nipple and production method thereof, particularly diameter 318mm ultra high power graphite electrode joint and production method thereof.
Technical background
Ultra high power graphite electrode is similar with producing, and the primary raw material of ultra high power graphite electrode joint is a needle coke, and needle coke is divided into coal-based needle coke and oil is a needle coke.With oil is that needle coke is compared, and the nitrogenous sulfur content of coal-based needle coke is high, in the later stage high-temperature process, in 1400 ℃ to 2100 ℃ intervals, causes the product inflatable easily, cracks waste product; Because thermal coefficient of expansion is higher, the product thermal shock resistance there is considerable influence simultaneously.
Low owing to the coal-based needle coke granule strength except that above-mentioned reason; Mix pinch with the die mould process in each grain grade proportion of filling a prescription destroyed easily; Thereby the intensity to final products exerts an influence, and causes product the cracking and the phenomenon that fractures in following process and use, to occur.
In the world; Have only Japan to adopt big specification ultra high power graphite electrode of coal-based needle coke production and joint; With homemade coal-based needle coke contrast; It is burnt that Japan's producing coal is that the main physical and chemical index of needle coke is better than homemade coal measures, and its physical and chemical index reaches or is the relevant parameter of needle coke near oil to a certain extent.
In sum, the raw material needle coke has become the principal element that restriction China produces ultra high power graphite electrode and joint.
Summary of the invention
The object of the present invention is to provide a kind of diameter 318mm ultra high power graphite electrode joint and production method thereof; It can overcome the restriction of existing factor; Utilize main physical and chemical index real density on the low side; The homemade coal-based needle coke that thermal coefficient of expansion and sulfur-bearing nitrogen content are higher is produced ultra high power graphite resistor rod with 600 mm diameter with diameter 318mm graphite electrode nipple.The present invention can effectively reduce production costs, and increases economic efficiency, and the actual needs that use are satisfied in the requirement that product quality indicator is met international standards.
Product diameter 318mm ultra high power graphite electrode joint of the present invention is a raw material with homemade coal-based needle coke; Its concrete prescription comprises: 2mm-1mm granularity coal-based needle coke; 1mm-0.5mm the granularity coal-based needle coke, the siccative component that-0.075mm coal-based needle coke fine powder is formed; Binding agent modified coal tar pitch in order to bonding above-mentioned siccative component; The stearic acid of supplement production and brown iron oxide (Fe
2O
3) additive formed.This formula combination is if calculate by weight percentage; If above-mentioned siccative component total weight is 100%; Then the shared percentage by weight of 2mm-1mm granularity coal-based needle coke is 20%; 1mm-0.5mm the shared percentage by weight of granularity coal-based needle coke is 10%, the shared percentage by weight of-0.075mm coal-based needle coke fine powder is 70%, and binding agent modified coal tar pitch and its weight of siccative component contrast are the 40%-50% of siccative composition weight; Stearic acid weight in the additive is the 0.5%-1% of siccative composition weight, brown iron oxide (Fe
2O
3) weight is 0.5% of siccative composition weight.
Product processes of the present invention comprises following processing step:
1) the die mould stage:
With raw material coal-based needle coke crushing and screening to obtain required each the specification siccative component of filling a prescription; Get into after siccative is heated to 180-200 ℃ to mix and pinch pot; Add binding agent modified coal tar pitch, stearic acid and brown iron oxide additive; Under 180-200 ℃ of temperature, mix and pinch and kept 15 minutes, water spray is cooled to 130-140 ℃ and wakes up and stuck with paste 5 minutes, gets into press then.Press material cylinder temperature remains 120 ± 5 ℃, at this temperatures machine the entering material is vacuumized and makes firm by ramming, and vacuum degree≤22mmHg makes pressure 1100-1300 ton firm by ramming, and pumpdown time ≮ 3 minute are made pressure hold time ≮ 10 second firm by ramming.After making end firm by ramming material is extruded, squeeze pressure should maintain 900-1100 ton, extrusion speed ≯ 5mm/s.This stage resulting product is a raw product, and bulk density is not less than 1.78g/cm
3
2) the roasting stage
Above-mentioned raw product is carried out roasting heat through baking furnace handle, process comprises bakes to burn the article, single-steeping, after baking, double-steeping, three roastings, three dippings, four roastings.Said each roasting process all automatically performs according to each roasting curve; Roasting finishes the back product and is cooled to 300 ℃ and comes out of the stove, and after the shot-blasting machine Shot Blasting, gets into impregnation tank, through impregnating pitch after high temperature impregnation process under the 10-15bar pressure; Get into next roasting process, finish until four roastings.This stage resulting product is a roasting product.
3) the graphitization stage
Above-mentioned roasting product is handled through flush end, packed in the internal thermal serial formula graphitizing furnace with the mode of four post bundlings, send electric graphitization processing according to the power-supply curve of setting behind the covering and heat insulating material according to end to end principle.This stage resulting product is the graphitization article.
4) process segment
The finished product of regulatory specifications is processed in the specification requirement measurement according to the rules of above-mentioned graphitization article, and according to the rules coupling requires to assemble in advance, pack, put in storage with the ultra high power graphite electrode finished product again after quality index and size index detect.
Said roasting stage bakes to burn the article curve is following:
The bakes to burn the article curve
Said roasting stage after baking, three roastings, four times the roasting curve is following:
Secondary, three times and four roasting curves
Said graphitization stage graphitization curve is following:
The graphitization power-supply curve
The present invention adopts technique scheme; The homemade coal-based needle coke that main physical and chemical index real density capable of using is on the low side, thermal coefficient of expansion and sulfur-bearing nitrogen content are higher is produced the big specification ultra high power graphite electrode of Φ 318mm and is used electrode nipple; Through detecting, the bulk density of this electrode nipple is 1.84g/cm
3, rupture strength is 11.70MPa, and modulus of elasticity is 7.56GPa, and resistivity is 4.5 μ Ω m, and thermal coefficient of expansion is 1.42X10
-6/ ℃, meet international standards.Thereby can solve that homemade coal-based needle coke is on the low side because of main physical and chemical index real density, thermal coefficient of expansion and the higher difficult problem that can't produce big specification ultra high power graphite electrode with electrode nipple of sulfur-bearing nitrogen content; And can realize of the production domesticization of big specification ultra high power graphite electrode with the primary raw material needle coke of electrode nipple; Simultaneously, China be can also solve effectively and China's carbon industry ultra high power graphite electrode production capacity and scale expansion problem seriously restricted because of the long-term dependence on import of raw material needle coke.Can reduce production costs, increase economic efficiency.
Product of the present invention is tested on probation on stove, non-cracking and other quality problems.
Description of drawings
Accompanying drawing is the process chart of diameter 318mm ultra high power graphite electrode with electrode nipple and production method thereof.
Embodiment
Specifically describe embodiment of the present invention in detail below in conjunction with instance.
Product of the present invention is to utilize the homemade coal-based needle coke of 100% Shanxi Hong Te to be raw material; Microstructure, real density, thermal coefficient of expansion, tap density, crushing strength according to this raw material; And the oil absorbency of this coal-based needle coke, design the prescription of satisfactory ultra high power graphite electrode with electrode nipple.This prescription comprises 2mm-1mm granularity coal-based needle coke, 1mm-0.5mm granularity coal-based needle coke, the siccative component that-0.075mm coal-based needle coke fine powder is formed; Binding agent modified coal tar pitch in order to bonding above-mentioned siccative component; The stearic acid of supplement production and brown iron oxide (Fe
2O
3) additive formed.This prescription counts 100% with needle coke siccative component; Then calculate 2mm-1mm granularity coal-based needle coke 20% then, 1mm-0.5mm granularity coal-based needle coke 10% according to percentage by weight;-0.075mm coal-based needle coke fine powder 70%; Binding agent modified coal tar pitch 40%-50%, stearic acid 0.5%-1%, brown iron oxide (Fe
2O
3) 0.5%.
Production method of the present invention comprises following processing step:
1) the die mould stage
The raw material coal-based needle coke is broken through jaw crusher, biconjugate roll crusher and Suspension roller flour mill, the required 2mm-1mm granularity coal-based needle coke that obtains after the screening filling a prescription, 1mm-0.5mm granularity coal-based needle coke;-0.075mm coal-based needle coke fine powder is sent into automatic batching system according to formula rate each granularity coal-based needle coke after with above-mentioned screening again, carries out automatic mix to obtain siccative; This siccative is discharged into Ai Li permitted mixes and to pinch pot after preheater is heated to 180-200 ℃, add binding agent modified coal tar pitch and stearic acid and the brown iron oxide additive of formula ratio after the dissolving of formula ratio again, mixedly under 180-200 ℃ of temperature pinch and kept 15 minutes; Mix and pinch into thickener; Wake up after thickener water spray is cooled to 130-140 ℃ and stuck with paste 5 minutes, enter 3000 tons upright smashing to crouch squeeze hydraulic presses, this hydraulic press vacuumizes and makes firm by ramming in advance under the thermal thermal temperature of design; Vacuum degree≤22mmHg; Make pressure 1100-1300 ton firm by ramming, pumpdown time ≮ 3 minute are made pressure hold time ≮ 10 second firm by ramming.After making end firm by ramming material is extruded, squeeze pressure should maintain 900-1100 ton, extrusion speed ≯ 5mm/s.This stage resulting product is a raw product, and bulk density is not less than 1.78g/cm
3, raw product obtains to meet the electrode green compact of specification requirement after shearing.
2) the roasting stage
9 one on above-mentioned electrode green compact are assembled into special roasting pot; Inserts is laid in specification requirement according to inserts is laid in roasting pot; Reaching the purpose of secluding air and uniformly transfer heat, tinning finishes the back and is pushed by waggon and carry out roasting heat in the formula baking furnace at the bottom of the car and handle, and carries out according to setting the roasting curve in this heat treatment process; Intensification finishes to naturally cool to normal temperature after the back water spray is cooled to 300 ℃ comes out of the stove, and accomplishes the bakes to burn the article operation.Product carries out Shot Blasting through shot-blasting machine behind the bakes to burn the article; Send in the impregnation tank; Use impregnating pitch to carry out carrying out after baking according to the after baking curve after high-pressure impregnation is handled, then obtain the after baking product, after above-mentioned ball blast and impregnation process, carry out three again and burn operations at 10-15bar; Finish until four calcining process by that analogy, the electrode that obtains to conform to quality requirements is joined the burning article.
3) the graphitization stage
Above-mentioned electrode baking article are handled the back through flush end packs in the internal thermal serial graphitized stove of " П " shape with the form of four post bundlings according to end to end principle; Energising heats up behind the covering and heat insulating material; Power-supply curve according to setting carries out graphitization processing, and processing finishes after detect the graphitization article that obtain meeting technical specification.
4) process segment
Above-mentioned graphitization article through numerical control machine tool, are processed into diameter 318mm standard specification electrode nipple finished product, after index and size detection, require to assemble in advance, pack, put in storage according to required precision and index coupling with diameter 600mm electrode body.
The present invention is through the inner detection of industry, and the bulk density of said electrode nipple is 1.84g/cm
3, rupture strength is 11.70MPa, and modulus of elasticity is 7.56GPa, and resistivity is 4.5 μ Ω m, and thermal coefficient of expansion is 1.42X10
-6/ ℃, meet international standards.
Claims (5)
1. a diameter 318mm ultra high power graphite electrode joint comprises 2mm-1mm granularity coal-based needle coke, 1mm-0.5mm granularity coal-based needle coke, the siccative component that-0.075mm coal-based needle coke fine powder is formed; Binding agent modified coal tar pitch in order to bonding above-mentioned siccative component; The stearic acid of supplement production and brown iron oxide (Fe
2O
3) additive formed.This formula combination is if calculate by weight percentage; If above-mentioned siccative component total weight is 100%; Then the shared percentage by weight of 2mm-1mm granularity coal-based needle coke is 20%; 1mm-0.5mm the shared percentage by weight of granularity coal-based needle coke is 10%, the shared percentage by weight of-0.075mm coal-based needle coke fine powder is 70%, and binding agent modified coal tar pitch and its weight of siccative component contrast are the 40%-50% of siccative composition weight; Stearic acid weight in the additive is the 0.5%-1% of siccative composition weight, brown iron oxide (Fe
2O
3) weight is 0.5% of siccative composition weight.
2. the production method of diameter 318mm ultra high power graphite electrode joint as claimed in claim 1 is characterized in that this production method comprises following processing step:
1) the die mould stage: with raw material coal-based needle coke crushing and screening to obtain according to claim 1 a specification granularity siccative component; By the said percentage by weight prescription of claim 1 the siccative component is prepared burden in automatic batching system; Be discharged into after then the siccative component being heated to 180-200 ℃ to mix and pinch pot, add binding agent modified coal tar pitch, stearic acid and brown iron oxide (Fe
2O
3) additive formed, under 180-200 ℃ of temperature, mix pinch and keep 15 minutes then water spray be cooled to 130-140 ℃ and wake up and stuck with paste 5 minutes, get into press afterwards.Press material cylinder temperature remains 120 ± 5 ℃, at this temperatures machine the entering material is vacuumized and makes firm by ramming, and vacuum degree≤22mmHg makes pressure 1100-1300 ton firm by ramming, and pumpdown time ≮ 3 minute are made pressure hold time ≮ 10 second firm by ramming.After making end firm by ramming material is extruded, squeeze pressure should maintain 900-1100 ton, extrusion speed ≯ 5mm/s.This stage resulting product is a raw product, and bulk density is not less than 1.78g/cm
3
2) the roasting stage: above-mentioned raw product is carried out roasting heat through baking furnace handle, process comprises bakes to burn the article, single-steeping, after baking, double-steeping, three roastings, three dippings, four roastings.Said each roasting process all automatically performs according to each roasting curve; Roasting finishes the back product and is cooled to 300 ℃ and comes out of the stove, and after the shot-blasting machine Shot Blasting, gets into impregnation tank, through impregnating pitch after high temperature impregnation process under the 10-15bar pressure; Get into next roasting process, finish until four roastings.This stage resulting product is a roasting product.
3) the graphitization stage: above-mentioned roasting product is handled through flush end, packed in the internal thermal serial formula graphitizing furnace with the mode of four post bundlings, send electric graphitization processing according to the power-supply curve of setting behind the covering and heat insulating material according to end to end principle.This stage resulting product is the graphitization article.
4) process segment: the finished product of regulatory specifications is processed in the specification requirement measurement according to the rules of above-mentioned graphitization article, and according to the rules coupling requires to assemble in advance, pack, put in storage with the ultra high power graphite electrode finished product again after quality index and size index detect.
3. the production method of diameter 318mm ultra high power graphite electrode joint 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
4. the production method of diameter 318mm ultra high power graphite electrode joint as claimed in claim 2 is characterized in that described after baking, and three roastings and four roasting curves are following:
Secondary, three times and four roasting curves
5. the production method of diameter 318mm ultra high power graphite electrode joint as claimed in claim 2 is characterized in that described graphitization power-supply curve is following:
The graphitization power-supply curve
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101828044A CN102364989A (en) | 2011-07-01 | 2011-07-01 | Ultra-high power graphite electrode nipple with diameter of 318mm and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101828044A CN102364989A (en) | 2011-07-01 | 2011-07-01 | Ultra-high power graphite electrode nipple with diameter of 318mm and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102364989A true CN102364989A (en) | 2012-02-29 |
Family
ID=45691533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101828044A Pending CN102364989A (en) | 2011-07-01 | 2011-07-01 | Ultra-high power graphite electrode nipple with diameter of 318mm and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102364989A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103043656A (en) * | 2012-12-19 | 2013-04-17 | 中国平煤神马集团开封炭素有限公司 | Method for manufacturing ultra-high power graphite electrode joint by using asphalt additive |
| CN106744919A (en) * | 2017-01-17 | 2017-05-31 | 韩俊培 | A kind of production technology of polycrystalline silicon base plate special graphite |
| CN107846744A (en) * | 2017-11-24 | 2018-03-27 | 吉林炭素有限公司 | A kind of graphite electrode nipple method for determining dimension based on normal temperature processing, applied at elevated temperature |
| CN107986269A (en) * | 2017-12-22 | 2018-05-04 | 中国平煤神马集团开封炭素有限公司 | A kind of internal thermal serial graphitized technique of ultrahigh power graphite electrode joint |
| CN108585861A (en) * | 2018-03-22 | 2018-09-28 | 合肥炭素有限责任公司 | A kind of electrode contact and preparation method thereof |
| CN109574669A (en) * | 2018-11-30 | 2019-04-05 | 大同新成新材料股份有限公司 | A kind of electrode contact preparation method for material adding graphite cathode material |
| CN111943187A (en) * | 2020-08-21 | 2020-11-17 | 合肥炭素有限责任公司 | Ultrahigh-power graphite electrode and preparation method thereof |
| CN112457014A (en) * | 2020-10-21 | 2021-03-09 | 大同宇林德石墨新材料股份有限公司 | Ultrahigh-power graphite electrode joint and preparation process thereof |
| CN113372118A (en) * | 2020-04-14 | 2021-09-10 | 吉林市高科特种炭素材料有限责任公司 | Preparation method of special graphite material |
| CN113860874A (en) * | 2021-08-23 | 2021-12-31 | 吉林炭素有限公司 | Design method for dry material grain composition in graphite electrode joint formula |
| CN116253566A (en) * | 2023-03-14 | 2023-06-13 | 山东亿维新材料有限责任公司 | Needle-shaped Jiao Jipei formula for preparing high-quality graphite electrode and preparation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4459697A (en) * | 1981-01-30 | 1984-07-10 | Fried. Krupp Gesellschaft Mit Beschrankter Haftung | Electrode arrangement for electric arc furnaces |
| CN1082805A (en) * | 1993-06-17 | 1994-02-23 | 刘英旺 | Produce the technology and the extrusion equipment thereof of ultra high power graphite electrode |
| CN101420801A (en) * | 2008-12-01 | 2009-04-29 | 山西晋能集团大同能源发展有限公司炭素分公司 | Graphite electrode with quasi-ultra-high power |
| 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 |
-
2011
- 2011-07-01 CN CN2011101828044A patent/CN102364989A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4459697A (en) * | 1981-01-30 | 1984-07-10 | Fried. Krupp Gesellschaft Mit Beschrankter Haftung | Electrode arrangement for electric arc furnaces |
| CN1082805A (en) * | 1993-06-17 | 1994-02-23 | 刘英旺 | Produce the technology and the extrusion equipment thereof of ultra high power graphite electrode |
| CN101420801A (en) * | 2008-12-01 | 2009-04-29 | 山西晋能集团大同能源发展有限公司炭素分公司 | Graphite electrode with quasi-ultra-high power |
| 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 |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103043656A (en) * | 2012-12-19 | 2013-04-17 | 中国平煤神马集团开封炭素有限公司 | Method for manufacturing ultra-high power graphite electrode joint by using asphalt additive |
| CN106744919A (en) * | 2017-01-17 | 2017-05-31 | 韩俊培 | A kind of production technology of polycrystalline silicon base plate special graphite |
| CN107846744A (en) * | 2017-11-24 | 2018-03-27 | 吉林炭素有限公司 | A kind of graphite electrode nipple method for determining dimension based on normal temperature processing, applied at elevated temperature |
| CN107986269A (en) * | 2017-12-22 | 2018-05-04 | 中国平煤神马集团开封炭素有限公司 | A kind of internal thermal serial graphitized technique of ultrahigh power graphite electrode joint |
| CN108585861A (en) * | 2018-03-22 | 2018-09-28 | 合肥炭素有限责任公司 | A kind of electrode contact and preparation method thereof |
| CN109574669A (en) * | 2018-11-30 | 2019-04-05 | 大同新成新材料股份有限公司 | A kind of electrode contact preparation method for material adding graphite cathode material |
| CN113372118A (en) * | 2020-04-14 | 2021-09-10 | 吉林市高科特种炭素材料有限责任公司 | Preparation method of special graphite material |
| CN111943187A (en) * | 2020-08-21 | 2020-11-17 | 合肥炭素有限责任公司 | Ultrahigh-power graphite electrode and preparation method thereof |
| CN112457014A (en) * | 2020-10-21 | 2021-03-09 | 大同宇林德石墨新材料股份有限公司 | Ultrahigh-power graphite electrode joint and preparation process thereof |
| CN113860874A (en) * | 2021-08-23 | 2021-12-31 | 吉林炭素有限公司 | Design method for dry material grain composition in graphite electrode joint formula |
| CN116253566A (en) * | 2023-03-14 | 2023-06-13 | 山东亿维新材料有限责任公司 | Needle-shaped Jiao Jipei formula for preparing high-quality graphite electrode and preparation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102364989A (en) | Ultra-high power graphite electrode nipple with diameter of 318mm and production method thereof | |
| CN101553060B (en) | Ultra high power graphite resistor rod with 600mm diameter and method for producing the same | |
| CN102363526A (en) | Ultra high power graphite electrode with its diameter being 650mm and production method thereof | |
| CN104386670B (en) | A kind of isostatic pressed high purity graphite material and preparation method thereof | |
| CN102898142B (en) | Preparation method for die graphite material used for electrical discharge machining | |
| CN110615680B (en) | Graphite electrode with GHP phi 960-phi 1420mm super-large specification and production method thereof | |
| CN108298984A (en) | A kind of diameter 750mm ultra high power graphite electrodes and its production method | |
| CN104555982B (en) | A kind of can-type calcine furnace for high sulfur petroleum coke calcining | |
| CN104876597B (en) | A kind of nanoscopic matrix combines high-performance electric smelting magnesia-calcium brick and its manufacture method | |
| CN102364988A (en) | Manufacturing method of graphite electrode with phi 700mm ultra high power used in alternating-current (ac) electric arc furnace | |
| CN104129782A (en) | Graphite electrode with diameter of 348 mm and manufacture method thereof | |
| CN102351548A (en) | Unburned magnesium-calcium-carbon brick and preparation method thereof | |
| CN103086364A (en) | Method for preparing high-strength ultra-high power graphite electrode | |
| CN107176845A (en) | A kind of method that regenerative magnesia-carbon brick is produced using waste and old refractory brick | |
| CN104860678A (en) | Method for producing ultra-high power graphite electrode through natural graphite | |
| CN107857261A (en) | A kind of preparation method of nuclear graphite materials | |
| JP2020041222A (en) | Magnetite-based sintered ore and method for producing the same | |
| CN102276272A (en) | High-calcium magnesia-calcia bricks and preparation method thereof | |
| CN109665852A (en) | A kind of roasting additive and its preparation process suitable for graphite electrode | |
| CN101306951A (en) | Non-sintered anti-hydrating konite carbon brick and preparation process | |
| CN203715283U (en) | System of producing graphite electrode | |
| CN104072161B (en) | After a kind of magnesite choosing, mine tailing prepares the method for calcium magnesia sand | |
| CN105025602A (en) | Carbon nanometer ultramicro material large carbon electrode and preparation method thereof | |
| CN113045292A (en) | High-purity magnesia brick for ultra-high temperature shaft kiln at temperature of more than or equal to 2100 ℃ and manufacturing method thereof | |
| CN103396142A (en) | Composite magnesium-calcium brick having low heat conductivity and high service performance and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 475002 village, eastern suburbs of Kaifeng City, Henan Province Applicant after: Kaifeng Carbon Co., Ltd., China Pingmei Shenma Group Address before: 475002 village, eastern suburbs of Kaifeng City, Henan Province Applicant before: Zhongping Energy & Chemical Group of Kaifeng Carbon Co., Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: KAIFENG CARBON CO., LTD., ZHONGPING ENERGY + CHEMICAL GROUP TO: KAIFENG CARBON CO., LTD. CHINA PINGMEI SHENMA GROUP |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120229 |