CN103561498A - 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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- CN103561498A CN103561498A CN201310582826.9A CN201310582826A CN103561498A CN 103561498 A CN103561498 A CN 103561498A CN 201310582826 A CN201310582826 A CN 201310582826A CN 103561498 A CN103561498 A CN 103561498A
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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-purpose carbon resistance rod of a kind of ferrochrome smelting and preparation method thereof.
Background technology
At present to produce what generally adopt be self-baking electrode to ferrochrome smelting, adopts the electrode paste heat-agglomerating of switching in mineral hot furnace use procedure to form.In recent years, country continues to increase environmental requirement dynamics, to using the ferroalloy industry of self-baking electrode to carry out industry access restriction.Electrode paste because can discharge a large amount of bitumen flue gas in the process of sintering, and contaminated environment, has a strong impact on the healthy of people.Electrode paste needs certain heat when sintering self-baking electrode into, need electric energy conversion be heat energy by its sintering, so just increased by approximately 5%～10% power consumption.Day by day deep along with national energy-saving emission reduction work in recent years, power consumption is large, discharge high enterprise will be eliminated gradually.And electrode paste is because expending, the energy is large, environmental pollution is serious, is also put into and eliminates industry catalogue; Moreover because careless manipulation can cause the generation of soft disconnected, the firmly disconnected accident of electrode, operating personnel's safety and normal production in serious threat.
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 20% granular electric forging coal, 18% coal tar pitch, 40% powdered graphite material 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, because graphite material content is high, can make electrode cost increase, and easily occurs oxidation under ferrochrome smelting high-temperature, occurs electrode accident.
The defect of using electrode paste and graphite carbon electrode to deposit for solving existing ferrochrome smelting, the inventor is controlled at the characteristic of 1700 ℃ of left and right techniques according to ferrochrome smelting temperature, develop the special-purpose carbon resistance rod of a kind of ferrochrome smelting, the special-purpose carbon resistance rod consumption of ferrochrome smelting is controlled to 20Kg/t left and right.If use electrode paste, consume 30～50Kg/t left and right.The special-purpose carbon resistance rod of ferrochrome smelting of the present invention, because adding antioxidant di-iron trioxide, reduce anodizing in ferrochrome production process, the electrode accident that reduction occurs because of over oxidation, simultaneously because reducing the consumption of graphite material, thereby reduced the production cost of electrode, and increased the mechanical strength of electrode.
The special-purpose carbon resistance rod of ferrochrome smelting of the present invention can be used as the substitute that country eliminates the backward production facilities, and belongs to national energy-saving and reduces discharging encouragement intermediate item; Under equal conditions, use the special-purpose carbon resistance rod production cost of ferrochrome smelting substantially the same with the cost of use electrode paste, but consumption can reduce half, very economical, can accelerate the paces that advance country to eliminate the backward production facilities.
The production technology of the special-purpose carbon resistance rod of ferrochrome smelting of the present invention adopts advanced sizing material technologically, has solved the heterogeneity problem in carbon resistance rod production process.
Summary of the invention
The object of the present invention is to provide the special-purpose carbon resistance rod of a kind of ferrochrome smelting.This electrode cost is low, mechanical strength is high, is difficult for because oxidation causes electrode accident, and alternative electrode paste, meanwhile, because adopting advanced sizing material technologically, has solved the heterogeneity problem in carbon resistance rod production process.
For realizing object of the present invention, provide following embodiment.
In one embodiment, the special-purpose carbon resistance rod of ferrochrome smelting of the present invention, component by following percentage by weight forms: 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-purpose carbon resistance rod of ferrochrome smelting of the present invention, described phosphoric acid is phosphoric acid solution, its concentration range is 70～95%, preferably 80～90%, most preferably 85%.
In a preferred embodiment, the special-purpose carbon resistance rod of ferrochrome smelting of the present invention, component by following percentage by weight forms: 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-purpose carbon resistance rod of ferrochrome smelting of the present invention, described phosphoric acid is phosphoric acid solution, 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.
The present invention also provides a kind of method of preparing the special-purpose carbon resistance rod of ferrochrome smelting, comprises the following steps:
1) calcined coke powder and coal tar pitch are put into the mixing of kneading pot, temperature is controlled at 140～160 ℃, keeps 15～25 minutes, makes sizing material;
2) granular electric forging coal, powdered graphite material are put into kneading pot, be heated to 150～185 ℃, kneading keeps 15～25 minutes, makes siccative;
3) by step 2) siccative join in the sizing material of step 1), then add di-iron trioxide and phosphoric acid to mix 5～15 minutes, temperature is controlled at 140～160 ℃, makes 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, make raw product;
5) raw product of step 4) is packed in baking furnace, be warming up to gradually 1200 ℃ of maximum temperatures, then naturally cool to 200 ℃ and come out of the stove, obtain roasting product;
6) roasting product of step 5) is processed, made the special-purpose carbon resistance rod of ferrochrome smelting of regulatory specifications.
The method of the invention described above, the heating retention 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 of preparing the special-purpose carbon resistance rod of ferrochrome smelting of the present invention, specifically comprises following processing step:
(1) prepare electrode raw product: by electric forging coal be ground into the particle of 4mm～16mm particle diameter, by blocky graphite material fragmentation, and be sieved into respectively the particulate material of the large, medium and small different size of regulation, entering automatic batching system prepares burden, take the siccative amount of regulation, by spiral transferring, send into the upper strata of double-deck kneading pot, carry out siccative heat treated, be heated to 150～185 ℃, keep 20 minutes, make siccative; Calcined coke is ground into the powdery of 0.05mm～0.075mm particle diameter, puts into lower floor's kneading pot and mix 20 minutes together with coal tar pitch, temperature is controlled at 140～160 ℃, makes sizing material; By prepared siccative in the kneading pot of upper strata put into lower floor's kneading pot sizing material, add di-iron trioxide and phosphoric acid to mix 10 minutes, temperature is controlled at 140～160 ℃, makes thickener; By this thickener by conveyer belt send into mix cylinder stir, be lowered to 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 meeting the raw product of specification requirement, stand-by.
(2), roasting: lay metallurgical coke grain according to the requirement of technical stipulation at the bottom of ring-form calcining furnace, pack above-mentioned stand-by raw product into ring-form calcining furnace, with metallurgical coke grain, fill space, and tamping, carry out roasting, be warming up to gradually 1200 ℃ of maximum temperatures, then naturally cool to 200 ℃ and come out of the stove, obtain qualified roasting product, stand-by.
(3), processing, finished product: the specification requirement according to the rules of above-mentioned stand-by roasting product is tested, be processed into the special-purpose carbon resistance rod product of ferrochrome smelting of regulatory specifications, through strict index and size detection, pack as requested, put in storage.
The special-purpose carbon resistance rod cost of ferrochrome smelting of the present invention is lower, and quality is even, and diameter can reach 1400mm.It can break through the requirement of existing domestic large-scale ferrochrome smelting to electrode paste, produce the special-purpose carbon resistance rod of a kind of ferrochrome smelting, with electrode paste ratio, can reduce the ferrochrome smelting electrode special that entreprise cost ，Wei enterprise provides a kind of simple installation, use safety, economy, low cost, energy-conserving and environment-protective.
The special-purpose 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/ ℃, ash content 1.5%, the standard that has exceeded ferrochrome smelting use electrode paste completely, the special-purpose carbon resistance rod of ferrochrome smelting replaces using the self-baking electrode of electrode paste, ferrochrome smelting factory is without self-baking, solve the self-baking electrode volatilization of bitumen flue gas in process of production of using electrode paste, in use there is no the discharge of pernicious gas, realized energy-conserving and environment-protective.The special-purpose carbon resistance rod of ferrochrome smelting of the present invention does not need to carry out self-baking, and directly installation can be used, and has saved the electric quantity consumption in self-baking process, has reduced the discharge of bitumen flue gas, belongs to a kind of energy-saving safe novel environment friendly product.Simultaneously, the special-purpose carbon resistance rod of ferrochrome smelting of the present invention has high, the good anti-thermal shock stability of mechanical strength, can reduce cold disconnected and hot the breaking of the self-baking electrode that uses electrode paste, 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-purpose carbon resistance rod of Fig. 1 ferrochrome smelting and production method thereof.
Embodiment
Below in conjunction with embodiment, describe in detail and understand the present invention, but with this, not limiting the scope of the invention.
Implementation column 1
The preparation of the special-purpose carbon resistance rod of ferrochrome smelting
Formula:
Preparation technology:
(1) prepare electrode raw product: by electric forging coal be ground into the particle of 4mm～16mm particle diameter, by blocky graphite material fragmentation, and be sieved into respectively the particulate material of the large, medium and small different size of regulation, entering automatic batching system prepares burden, take the siccative amount of regulation (formula ratio), by spiral transferring, send into the upper strata of double-deck kneading pot, carry out siccative heat treated, be heated to 150～185 ℃, keep 20 minutes, make siccative; Calcined coke is ground into the powdery of 0.05mm～0.075mm particle diameter, puts into lower floor's kneading pot and mix 20 minutes together with coal tar pitch, temperature is controlled at 140～160 ℃, makes sizing material; By prepared siccative in the kneading pot of upper strata put into lower floor's kneading pot sizing material, add di-iron trioxide and phosphoric acid to mix 10 minutes, temperature is controlled at 140～160 ℃, makes thickener.By this thickener by conveyer belt send into mix cylinder stir, be lowered to 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 meeting the raw product of specification requirement, stand-by.
(2) roasting: lay metallurgical coke grain according to the requirement of technical stipulation at the bottom of ring-form calcining furnace, pack above-mentioned stand-by raw product into ring-form calcining furnace, with metallurgical coke grain, fill space, and tamping, add thermal bake-out, be warming up to gradually 1200 ℃ of maximum temperatures, then naturally cool to 200 ℃ and come out of the stove, obtain qualified roasting product, stand-by.
(3), processing, finished product: the specification requirement according to the rules of above-mentioned stand-by roasting product is tested, by numerical control machine tool, be processed into the product of regulatory specifications, through strict index and size detection, pack as requested, put in storage.
The format diameter of the special-purpose 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-purpose carbon resistance rod of ferrochrome smelting, formula is in Table 1.
The formula of the special-purpose carbon resistance rod of table 1 embodiment 2～6 ferrochrome smeltings
Preparation technology:
(1) prepare electrode raw product: by electric forging coal be ground into the particle of 4mm～16mm particle diameter, by blocky graphite material fragmentation, and be sieved into respectively the particulate material of the large, medium and small different size of regulation, entering automatic batching system prepares burden, take the siccative amount of regulation (formula ratio), by spiral transferring, send into the upper strata of double-deck kneading pot, carry out siccative heat treated, be heated to 150～185 ℃, keep 15-25 minute (wherein, embodiment 2-4 is that 20 minutes, embodiment 5 are that 15 minutes, embodiment 6 are 25 minutes), make siccative; Calcined coke is ground into the powdery of 0.05mm～0.075mm particle diameter, put into lower floor's kneading pot mixing 15-25 minute (wherein together with coal tar pitch, embodiment 2-4 is that 20 minutes, embodiment 5 are that 15 minutes, embodiment 6 are 25 minutes), temperature is controlled at 140～160 ℃, makes sizing material; By prepared siccative in the kneading pot of upper strata put into lower floor's kneading pot sizing material, add di-iron trioxide and phosphoric acid mixing 5-15 minute (wherein, embodiment 2-4 is that 10 minutes, embodiment 5 are that 15 minutes, embodiment 6 are 5 minutes), temperature is controlled at 140～160 ℃, makes thickener.By this thickener by conveyer belt send into mix cylinder stir, be lowered to 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 meeting the raw product of specification requirement, stand-by.
(2) roasting: lay metallurgical coke grain according to the requirement of technical stipulation at the bottom of ring-form calcining furnace, pack above-mentioned stand-by raw product into ring-form calcining furnace, with metallurgical coke grain, fill space, and tamping, add thermal bake-out, be warming up to gradually 1200 ℃ of maximum temperatures, then naturally cool to 200 ℃ and come out of the stove, obtain qualified roasting product, stand-by.
(3), processing, finished product: the specification requirement according to the rules of above-mentioned stand-by roasting product is tested, by numerical control machine tool, be processed into the product of regulatory specifications, through strict index and size detection, pack as requested, put in storage.
The format diameter of the special-purpose 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 are revised the protection range that all belongs to claim of the present invention.
Claims (10)
1. the special-purpose carbon resistance rod of a ferrochrome smelting, component by following percentage by weight forms: 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.
2. carbon resistance rod as claimed in claim 1, component by following percentage by weight forms: 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, its concentration is 70～95%.
4. carbon resistance rod as claimed in claim 3, the concentration of described phosphoric acid solution is 80～90%.
5. carbon resistance rod as claimed in claim 1, the particle size range of described granular electric forging coal is 4mm～16mm.
6. carbon resistance rod as claimed in claim 1, the particle size range of described powdery calcined coke is 0.05mm～0.075mm.
7. a method of preparing the special-purpose carbon resistance rod of ferrochrome smelting of claim 1, comprises the following steps:
1) calcined coke powder and coal tar pitch are put into the mixing of kneading pot, temperature is controlled at 140～160 ℃, keeps 15～25 minutes, makes sizing material;
2) granular electric forging coal, powdered graphite material are put into kneading pot, be heated to 150～185 ℃, kneading keeps 15～25 minutes, makes siccative;
3) by step 2) siccative join in the sizing material of step 1), then add di-iron trioxide and phosphoric acid to mix 5～15 minutes, temperature is controlled at 140～160 ℃, makes 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, make raw product;
5) raw product of step 4) is packed in baking furnace, be warming up to gradually 1200 ℃ of maximum temperatures, then naturally cool to 200 ℃ and come out of the stove, obtain roasting product;
6) roasting product of step 5) is processed, made the special-purpose carbon resistance rod of ferrochrome smelting of regulatory specifications.
8. method as claimed in claim 7, the retention time of step 1) is 20 minutes.
9. kneading time method as claimed in claim 7, step 2) is 20 minutes.
10. incorporation time method as claimed in claim 7, step 2) is 10 minutes.
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Cited By (2)
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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 |
| CN118084493A (en) * | 2024-04-25 | 2024-05-28 | 山西三元炭素有限责任公司 | Graphite coke electrode of submerged arc furnace and preparation process |
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