CN103561498B - Carbon electrode special for ferrochrome smelting and manufacturing method thereof - Google Patents
Carbon electrode special for ferrochrome smelting and manufacturing method thereof Download PDFInfo
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- CN103561498B CN103561498B CN201310582826.9A CN201310582826A CN103561498B CN 103561498 B CN103561498 B CN 103561498B CN 201310582826 A CN201310582826 A CN 201310582826A CN 103561498 B CN103561498 B CN 103561498B
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Abstract
The invention discloses a carbon electrode special for ferrochrome smelting and a manufacturing method of the carbon electrode special for ferrochrome smelting. The carbon electrode special for ferrochrome smelting is composed of, by weight, 35-45% of granular electrically calcined coal, 14-20% of coal pitch, 9-15% of granular graphite materials, 25-35% of granular calcined coke, 0.2-0.8% of ferric oxide and 0.2-0.8% of phosphoric acid. The granular electrically calcined coal and the graphite materials are evenly distributed in sizing materials formed by the coal pitch and the granular calcined coke. The carbon electrode special for ferrochrome smelting does not need self-baking and can be used by being installed directly, electricity consumption of self-baking is saved, discharge of exhaust gas of pitch is reduced, and the carbon electrode special for ferrochrome smelting is a safe, energy-saving, novel and environment-friendly product.
Description
Technical field
The invention belongs to carbon resistance rod technical field, be specifically related to special carbon resistance rod of a kind of ferrochrome smelting and preparation method thereof.
Background technology
What current ferrochrome smelting production generally adopted is self-baking electrode, adopts electrode paste electrified regulation sintering in mineral hot furnace use procedure to form.In recent years, country continues to increase environmental requirement dynamics, has carried out industry access restriction to using the ferroalloy industry of self-baking electrode.Electrode paste, because can discharge a large amount of bitumen flue gas, contaminated environment in the process of sintering, has a strong impact on the healthy of people.Electrode paste needs certain heat when sintering self-baking electrode into, need electric energy conversion to be that heat energy is sintered, which adds the power consumption of about 5% ~ 10%.Day by day deep in recent years along with national energy-saving emission reduction work, power consumption is large, discharge high enterprise will be eliminated gradually.And electrode paste is because expending, and the energy is large, environmental pollution serious, be also put into superseded industry catalogue; Moreover because careless manipulation can cause the generation of soft disconnected, the hard disconnected accident of electrode, serious threat the safety of operating personnel and is produced normally.
Chinese patent CN101808435 discloses a kind of major diameter semi-graphite carbon electrode and production method thereof, this full-diameter carbon electrode made from schungite, comprise the granular electric forging coal of 20%, the coal tar pitch of 18%, the powdered graphite material of 40% and 22% powdery calcined coke, total weight is 100%, and described electric forging coal, graphite material and calcined coke are evenly distributed in described coal tar pitch cementing medium.This graphite carbon electrode is high due to graphite material content, and electrode cost can be made to increase, and under ferrochrome smelting high-temperature, easily occur oxidation, occurs electrode accident.
For solving the defect that existing ferrochrome smelting uses electrode paste and graphite carbon electrode to deposit, the present inventor controls the characteristic about 1700 DEG C techniques according to ferrochrome smelting temperature, develop the special carbon resistance rod of a kind of ferrochrome smelting, special for ferrochrome smelting carbon resistance rod consumption is controlled at about 20Kg/t.If use electrode paste, about 30 ~ 50Kg/t be consumed.The special carbon resistance rod of ferrochrome smelting of the present invention, because adding antioxidant di-iron trioxide, reduce anodizing in ferrochrome production process, reduce the electrode accident because over oxidation occurs, simultaneously because reducing the consumption of graphite material, thus reduce the production cost of electrode, and add the mechanical strength of electrode.
The substitute that the special carbon resistance rod of ferrochrome smelting of the present invention can eliminate the backward production facilities as country, belongs to national energy-saving and reduces discharging encouragement intermediate item; Under equal conditions, use ferrochrome smelting special carbon resistance rod production cost substantially the same with the cost of use electrode paste, but consumption can reduce half, very economical, the paces advancing country to eliminate the backward production facilities can be accelerated.
The production technology of the special carbon resistance rod of ferrochrome smelting of the present invention adopts advanced sizing material technologically, solves the heterogeneity problem in carbon resistance rod production process.
Summary of the invention
The object of the present invention is to provide the special carbon resistance rod of a kind of ferrochrome smelting.This electrode cost is low, mechanical strength is high, not easily because oxidation causes electrode accident, alternative electrode paste, meanwhile, because adopting advanced sizing material technologically, solves the heterogeneity problem in carbon resistance rod production process.
For realizing object of the present invention, provide following embodiment.
In one embodiment, the special carbon resistance rod of ferrochrome smelting of the present invention, be made up of the component of following percentage by weight: granular electric forging coal 35 ~ 45%, coal tar pitch 14 ~ 20%, graphite granule material 9 ~ 15%, powdery calcined coke 25 ~ 35%, di-iron trioxide 0.2 ~ 0.8%, phosphoric acid 0.2 ~ 0.8%, described electric forging coal, graphite material are evenly distributed in the sizing material of coal tar pitch and the formation of powdery calcined coke
In the above-described embodiment, the special carbon resistance rod of ferrochrome smelting of the present invention, described phosphoric acid is phosphoric acid solution, and its concentration range is 70 ~ 95%, preferably 80 ~ 90%, most preferably 85%.
In a preferred embodiment, the special carbon resistance rod of ferrochrome smelting of the present invention, be made up of the component of following percentage by weight: granular electric forging coal 42%, coal tar pitch 16%, graphite granule material 13%, powdery calcined coke 28%, di-iron trioxide 0.5%, phosphoric acid 0.5%, described electric forging coal, graphite material are evenly distributed in the sizing material of coal tar pitch and the formation of powdery calcined coke.
In above-mentioned preferred embodiment, the special carbon resistance rod of ferrochrome smelting of the present invention, described phosphoric acid is phosphoric acid solution, and its concentration range is 70 ~ 95%, preferably 80 ~ 90%, most preferably 85%.
In above-mentioned embodiment and preferred embodiment, the particle size range of described granular electric forging coal is 4mm ~ 16mm; The particle size range of described powdery calcined coke is 0.05mm ~ 0.075mm.
Present invention also offers a kind of method preparing the special carbon resistance rod of ferrochrome smelting, comprise the following steps:
1) calcined coke powder and coal tar pitch are put into the mixing of kneading pot, temperature controls at 140 ~ 160 DEG C, keeps 15 ~ 25 minutes, obtained sizing material;
2) granular electric forging coal, powdered graphite material are put into kneading pot, be heated to 150 ~ 185 DEG C, kneading keeps 15 ~ 25 minutes, obtained siccative;
3) by step 2) siccative join in the sizing material of step 1), then add di-iron trioxide and phosphoric acid mixing 5 ~ 15 minutes, temperature controls at 140 ~ 160 DEG C, obtained thickener;
4) by the thickener of step 3), take predetermined weight, put into mould, under the effect of 200 tons of exciting forces, keep vibration at high speed, make bulk density>=1.70g/cm
3, obtained raw product;
5) raw product of step 4) is loaded in baking furnace, be warming up to maximum temperature 1200 DEG C gradually, then naturally cool to 200 DEG C and come out of the stove, obtain roasting product;
6) roasting product of step 5) is processed, the special carbon resistance rod of ferrochrome smelting of obtained regulatory specifications.
The method of the invention described above, the heated hold time of step 1) is 20 minutes, step 2) the kneading time be 20 minutes; The incorporation time of step 3) is 10 minutes.
The method preparing the special carbon resistance rod of ferrochrome smelting of the present invention, specifically comprises following processing step:
(1) electrode raw product is prepared: electric forging coal is ground into the particle of 4mm ~ 16mm particle diameter, by blocky graphite material fragmentation, and be sieved into the particulate material of the large, medium and small different size of regulation respectively, enter automatic batching system to prepare burden, take the siccative amount of regulation, sent into the upper strata of double-deck kneading pot by spiral transferring, carry out siccative heat treated, be heated to 150 ~ 185 DEG C, keep 20 minutes, obtained siccative; Calcined coke is ground into the powdery of 0.05mm ~ 0.075mm particle diameter, put into lower floor's kneading pot and mix 20 minutes together with coal tar pitch, temperature controls at 140 ~ 160 DEG C, obtained sizing material; Siccative prepared in the kneading pot of upper strata put into the sizing material of lower floor's kneading pot, add di-iron trioxide and phosphoric acid mixes 10 minutes, temperature controls at 140 ~ 160 DEG C, obtained thickener; This thickener is sent into by conveyer belt and mixes cylinder and stir, under enter measuring chute, take predetermined weight, put into mould, under the effect of 200 tons of exciting forces, keep vibration at high speed, make bulk density>=1.70g/cm
3, obtain the raw product meeting technical requirement, stand-by.
(2), roasting: lay metallurgical coke grain according to the requirement of technical stipulation at the bottom of ring-form calcining furnace, above-mentioned stand-by raw product is loaded ring-form calcining furnace, space is filled with metallurgical coke grain, and tamping, carry out roasting, be warming up to maximum temperature 1200 DEG C gradually, then naturally cool to 200 DEG C and come out of the stove, obtain qualified roasting product, stand-by.
(3), processing, finished product: the technical requirement of above-mentioned stand-by roasting product according to regulation is tested, is processed into the special carbon resistance rod product of ferrochrome smelting of regulatory specifications, through strict index and size detection, carries out as requested packing, putting in storage.
Ferrochrome smelting of the present invention special carbon resistance rod cost is lower, uniform quality, and diameter can reach 1400mm.It can break through existing domestic large-scale ferrochrome smelting to the requirement of electrode paste, produce the special carbon resistance rod of a kind of ferrochrome smelting, with electrode paste ratio, entreprise cost can be reduced, for enterprise provides the ferrochrome smelting electrode special of a kind of simple installation, use safety, economy, low cost, energy-conserving and environment-protective.
The special carbon resistance rod of ferrochrome smelting of the present invention, after testing, the bulk density of electrode is 1.64g/cm
3, resistivity 38 μ Ω m, rupture strength 9.7Mpa, compression strength 30.8Mpa, thermal coefficient of expansion 4.0 × 10
-6/ DEG C, ash content 1.5%, completely outstripped the standard that ferrochrome smelting uses electrode paste, the special carbon resistance rod of ferrochrome smelting replaces the self-baking electrode using electrode paste, ferrochrome smelting factory is without the need to self-baking, solve the volatilization of the self-baking electrode bitumen flue gas in process of production using electrode paste, in use there is no the discharge of pernicious gas, achieve energy-conserving and environment-protective.The special carbon resistance rod of ferrochrome smelting of the present invention does not need to carry out self-baking, directly installs and can use, saved the electric quantity consumption in self-baking process, decreased the discharge of bitumen flue gas, belonged to a kind of energy-saving safe novel environment friendly product.Simultaneously, the special carbon resistance rod of ferrochrome smelting of the present invention has high, the good heat-resistant knocking stability of mechanical strength, can reduce and use the cold disconnected of the self-baking electrode of electrode paste and heat to break, can improve into stove power and electrothermal furnace efficiency, shorten the heat, there is larger energy-saving potential.
Accompanying drawing explanation
The process chart of the special carbon resistance rod of Fig. 1 ferrochrome smelting and production method thereof.
Embodiment
Describe in detail below in conjunction with embodiment and understand the present invention, but not limiting the scope of the invention with this.
Implementation column 1
The preparation of the special carbon resistance rod of ferrochrome smelting
Formula:
Preparation technology:
(1) electrode raw product is prepared: electric forging coal is ground into the particle of 4mm ~ 16mm particle diameter, by blocky graphite material fragmentation, and be sieved into the particulate material of the large, medium and small different size of regulation respectively, enter automatic batching system to prepare burden, take the siccative amount of regulation (formula ratio), sent into the upper strata of double-deck kneading pot by spiral transferring, carry out siccative heat treated, be heated to 150 ~ 185 DEG C, keep 20 minutes, obtained siccative; Calcined coke is ground into the powdery of 0.05mm ~ 0.075mm particle diameter, put into lower floor's kneading pot and mix 20 minutes together with coal tar pitch, temperature controls at 140 ~ 160 DEG C, obtained sizing material; Siccative prepared in the kneading pot of upper strata put into the sizing material of lower floor's kneading pot, add di-iron trioxide and phosphoric acid mixes 10 minutes, temperature controls at 140 ~ 160 DEG C, obtained thickener.This thickener is sent into by conveyer belt and mixes cylinder and stir, under enter measuring chute, take predetermined weight, put into mould, under the effect of 200 tons of exciting forces, keep vibration at high speed, make bulk density>=1.70g/cm
3.Obtain the raw product meeting technical requirement, stand-by.
(2) roasting: lay metallurgical coke grain according to the requirement of technical stipulation at the bottom of ring-form calcining furnace, above-mentioned stand-by raw product is loaded ring-form calcining furnace, space is filled with metallurgical coke grain, and tamping, carry out adding thermal bake-out, be warming up to maximum temperature 1200 DEG C gradually, then naturally cool to 200 DEG C and come out of the stove, obtain qualified roasting product, stand-by.
(3), processing, finished product: the technical requirement of above-mentioned stand-by roasting product according to regulation is tested, by numerical control machine tool, is processed into the product of regulatory specifications, through strict index and size detection, carries out as requested packing, putting in storage.
The format diameter of the special carbon resistance rod of ferrochrome smelting of the present invention, can determine according to the size of ferrochrome smelting stove, its format diameter can reach 1400mm.
Embodiment 2 ~ 6
The special carbon resistance rod of ferrochrome smelting, formula is in table 1.
The formula of the special carbon resistance rod of table 1 embodiment 2 ~ 6 ferrochrome smelting
Preparation technology:
(1) electrode raw product is prepared: electric forging coal is ground into the particle of 4mm ~ 16mm particle diameter, by blocky graphite material fragmentation, and be sieved into the particulate material of the large, medium and small different size of regulation respectively, enter automatic batching system to prepare burden, take the siccative amount of regulation (formula ratio), the upper strata of double-deck kneading pot is sent into by spiral transferring, carry out siccative heat treated, be heated to 150 ~ 185 DEG C, keep 15-25 minute (wherein, embodiment 2-4 is 20 minutes, embodiment 5 is 15 minutes, embodiment 6 is 25 minutes), obtained siccative; Calcined coke is ground into the powdery of 0.05mm ~ 0.075mm particle diameter, lower floor's kneading pot mixing 15-25 minute is put into (wherein together with coal tar pitch, embodiment 2-4 is 20 minutes, embodiment 5 is 15 minutes, embodiment 6 is 25 minutes), temperature controls at 140 ~ 160 DEG C, obtained sizing material; Siccative prepared in the kneading pot of upper strata put into the sizing material of lower floor's kneading pot, add di-iron trioxide and phosphoric acid mixing 5-15 minute (wherein, embodiment 2-4 is 10 minutes, embodiment 5 is 15 minutes, embodiment 6 is 5 minutes), temperature controls at 140 ~ 160 DEG C, obtained thickener.This thickener is sent into by conveyer belt and mixes cylinder and stir, under enter measuring chute, take predetermined weight, put into mould, under the effect of 200 tons of exciting forces, keep vibration at high speed, make bulk density>=1.70g/cm
3.Obtain the raw product meeting technical requirement, stand-by.
(2) roasting: lay metallurgical coke grain according to the requirement of technical stipulation at the bottom of ring-form calcining furnace, above-mentioned stand-by raw product is loaded ring-form calcining furnace, space is filled with metallurgical coke grain, and tamping, carry out adding thermal bake-out, be warming up to maximum temperature 1200 DEG C gradually, then naturally cool to 200 DEG C and come out of the stove, obtain qualified roasting product, stand-by.
(3), processing, finished product: the technical requirement of above-mentioned stand-by roasting product according to regulation is tested, by numerical control machine tool, is processed into the product of regulatory specifications, through strict index and size detection, carries out as requested packing, putting in storage.
The format diameter of the special carbon resistance rod of ferrochrome smelting of the present invention, can determine according to the size of ferrochrome smelting stove, its format diameter can reach 1400mm.
All simple distortion of making without departing from the spirit and substance in the present invention or flexibility amendment all belong to the protection range of claim of the present invention.
Claims (8)
1. the special carbon resistance rod of ferrochrome smelting, be made up of the component of following percentage by weight: granular electric forging coal 35 ~ 45%, coal tar pitch 14 ~ 20%, graphite granule material 9 ~ 15%, powdery calcined coke 25 ~ 35%, di-iron trioxide 0.2 ~ 0.8%, phosphoric acid 0.2 ~ 0.8%, described electric forging coal and graphite material are evenly distributed in the sizing material of coal tar pitch and the formation of powdery calcined coke, described phosphoric acid is phosphoric acid solution, and its concentration is 70 ~ 95%.
2. carbon resistance rod as claimed in claim 1, be made up of the component of following percentage by weight: granular electric forging coal 42%, coal tar pitch 16%, graphite granule material 13%, powdery calcined coke 28%, di-iron trioxide 0.5%, phosphoric acid 0.5%, described electric forging coal and graphite material are evenly distributed in the sizing material of coal tar pitch and the formation of powdery calcined coke.
3. carbon resistance rod as claimed in claim 1 or 2, described phosphoric acid is phosphoric acid solution, and its concentration is 80 ~ 90%.
4. carbon resistance rod as claimed in claim 1, the particle size range of described granular electric forging coal is 4mm ~ 16mm.
5. carbon resistance rod as claimed in claim 1, the particle size range of described powdery calcined coke is 0.05mm ~ 0.075mm.
6. prepare a method for the special carbon resistance rod of ferrochrome smelting of claim 1, comprise the following steps:
1) calcined coke powder and coal tar pitch are put into the mixing of kneading pot, temperature controls at 140 ~ 160 DEG C, keeps 15 ~ 25 minutes, obtained sizing material;
2) granular electric forging coal, powdered graphite material are put into kneading pot, be heated to 150 ~ 185 DEG C, kneading keeps 15 ~ 25 minutes, obtained siccative;
3) by step 2) siccative join step 1) sizing material in, then add di-iron trioxide and phosphoric acid mixing 5 ~ 15 minutes, temperature controls at 140 ~ 160 DEG C, obtained thickener;
4) by step 3) thickener, take predetermined weight, put into mould, under the effect of 200 tons of exciting forces, keep vibration at high speed, make bulk density>=1.70g/cm
3, obtained raw product;
5) by step 4) raw product load in baking furnace, be warming up to maximum temperature 1200 DEG C gradually, then naturally cool to 200 DEG C and come out of the stove, obtain roasting product;
6) by step 5) roasting product process, the special carbon resistance rod of ferrochrome smelting of obtained regulatory specifications.
7. method as claimed in claim 6, step 1) retention time be 20 minutes.
8. method as claimed in claim 6, step 2) the kneading time be 20 minutes.
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| CN201310582826.9A CN103561498B (en) | 2013-11-19 | 2013-11-19 | Carbon electrode special for ferrochrome smelting and manufacturing method thereof |
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| CN201310582826.9A CN103561498B (en) | 2013-11-19 | 2013-11-19 | Carbon electrode special for ferrochrome smelting and manufacturing method thereof |
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| CN106087033A (en) * | 2016-06-24 | 2016-11-09 | 苏州华冲精密机械有限公司 | Novel graphite resistor rod for aluminum foil corrosion of capacitor |
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| CN100418878C (en) * | 2006-11-20 | 2008-09-17 | 彭绍权 | Production method of large diameter tubular semi-graphite carbon electrode |
| CN101808435B (en) * | 2010-03-31 | 2011-12-28 | 焦作市东星炭电极有限公司 | Full-diameter carbon electrode made from schungite and production method thereof |
| CN101983002B (en) * | 2010-11-26 | 2012-01-25 | 河北联冠电极股份有限公司 | Special carbon electrode for smelting of titanium slag and preparation method thereof |
| CN102887503B (en) * | 2011-07-22 | 2014-08-13 | 任利华 | Method for reducing content of coal pitch and producing carbon product |
| CN102355759B (en) * | 2011-07-22 | 2013-02-20 | 河北联冠电极股份有限公司 | Charcoal electrode specially used in smelting of ferroalloy and preparation method thereof |
| CN103249194B (en) * | 2013-05-21 | 2016-04-06 | 焦作市东星炭电极有限公司 | A kind of large-diameter high-graphite carbon electrode and production method thereof |
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Address after: 409900 Meizui Village, Longchi Town, Xiushan County, Chongqing Patentee after: CHONGQING DONGXING CARBON MATERIAL Co.,Ltd. Address before: 409900 Meicui Village, Longchi Town, Xiushan Tujia and Miao Autonomous County, Chongqing Patentee before: CHONGQING EASTSTAR HIGH TEMPERATURE MATERIAL Co.,Ltd. |
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Address after: 409900 Meizui Village, Longchi Town, Xiushan County, Chongqing Patentee after: Chongqing Dongxing Carbon Material Co.,Ltd. Address before: 409900 Meizui Village, Longchi Town, Xiushan County, Chongqing Patentee before: CHONGQING DONGXING CARBON MATERIAL Co.,Ltd. |