CN106565253A - Preparation method of graphite lining for metal furnace - Google Patents
Preparation method of graphite lining for metal furnace Download PDFInfo
- Publication number
- CN106565253A CN106565253A CN201610935558.8A CN201610935558A CN106565253A CN 106565253 A CN106565253 A CN 106565253A CN 201610935558 A CN201610935558 A CN 201610935558A CN 106565253 A CN106565253 A CN 106565253A
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- roasting
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- graphite liner
- metal furnaces
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/522—Graphite
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1621—Making linings by using shaped elements, e.g. bricks
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/48—Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Products (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a preparation method of a graphite lining for a metal furnace. Calcined petroleum coke is used as aggregate, coal pitch is used as a binder, and a high-bulk-density, low-porosity, high-temperature-resistant, corrosion-resistant and antioxidant graphite material is produced through a series of technological processes such as raw material crushing, mixing, mixing kneading, material airing, vibration molding, roasting, impregnation, secondary roasting, graphitization, machining and the like. With the graphite lining material, various indexes of the graphite lining are greatly increased, the service life of the graphite lining is greatly prolonged, and the problems of poor corrosion resistance, poor abrasion resistance, poor fracture resistance, poor compression resistance and low use temperature are solved.
Description
Technical field
The present invention relates to graphite liner preparing technical field, particularly relates to a kind of preparation side of metal furnaces graphite liner
Method.
Background technology
Metal furnaces, it is mainly used in smelting ferrous metal or non-ferrous metal etc..Due to metal smelting require it is higher, it is therefore required
Liner is wanted to require equally higher.The brickwork existing advantage of liner scheme that each Usiminas grasps, also there is shortcoming, and main sets out
Point goes to weigh around the indices and service life of metal furnaces liner.
The life-span of refractory lining is affected very big by slag in metal furnaces, due to its furnace lining wearability and corrosion resistance and
Non-oxidizability is poor, and refractory material furnace lining long-time is subject to the corrosion, wear of slag, cold and hot exchange amplitude larger, causes liner
Service life shorten.
Therefore, task most urgent in recent years is exactly whether Chinese Enterprises can produce required metal inner lining of furnace, to take
For the metal inner lining of furnace of import.
Therefore, it is necessary to a kind of preparation method of new metal furnaces graphite liner is designed, to solve above-mentioned technical problem.
The content of the invention
For problem present in background technology, it is an object of the invention to provide a kind of preparation of metal furnaces graphite liner
Method, graphite liner material greatly improves each of graphite liner through calcining, roasting, dipping, graphited manufacturing procedure
Item index, improves service life, solves the problems, such as that corrosion-resistant, wearability, anti-folding, resistance to compression are poor and low using temperature.
The technical scheme is that what is be achieved in that：A kind of preparation method of metal furnaces graphite liner, including S1, original
Material is broken, and bulk after-smithing petroleum coke is carried out being crushed to the granularity of 0.5-15mm, worn into below 0.12mm or 0.075mm particle diameters
Powder little particle is sieved again；S2, dispensing, according to after-smithing petroleum coke 80%, the ratio of Coal-tar Pitch 20% is calculated respectively, claimed
Amount and then collocation；S3, kneading, by the raw material stirring mix homogeneously matched in above-mentioned steps, are kneaded into plasticity thickener, its
In, dry-mixed 25-40min, wet mixing 50-60min；S4, dry in the air material, and the good thickener of kneading is transported in cool material equipment, and temperature is 90-
110 DEG C, the time is 25-30min, and unnecessary flue gas and volatile matters and heat are discharged, and makes to be reduced with the temperature difference of binding agent；S5、
Vibration moulding, the thickener for drying well is fitted in prefabricated mould, and using the pressure of 3-5MPa, precompressed 5min, Vibration on Start-up is put down
It is qualified that platform carries out being tested whether after pressing when shaking using the pressure of 8-12MPa；S6, roasting, by qualified products formed ring is placed on
In formula roaster, inserts are added, heat up sintering, and a roasting 600h, 1100 DEG C, after baking 500h, are fixed into by 900 DEG C
Type product shape makes coal tar pitch be carbonized；S7, dipping, roasting product is positioned in horizontal impregnating autoclave, and curve intensification roasting, evacuation adds
Pressure is immersed in liquid impregnating agent in roasting product hole；Impregnating rate of body weight gain formula is：G=(W2-W1)/W1 × 100%, wherein, one
Secondary pickled product rate of body weight gain >=15%, double-steeping product rate of body weight gain >=10%；S8, graphitization, by the good roasting product of stain agent Chinese mugwort is placed on
In strange inferior graphitizing furnace, energization 60-80h is warming up to 2800-3000 DEG C, makes amorphous Turbostratic charcoal change into three-dimensional order
Graphite crystalline structure；S9, machining, are cut off, the machinery of planar end surface, the car conical surface and fluting adds to the finished product after graphitization
Work process and inspection.
In above-mentioned technical proposal, in step sl, the pulverizing refers to by raymond mill that carbonaceous raw material is levigate
Powder little particle to below 0.12mm or 0.075mm particle diameters.
In above-mentioned technical proposal, in step sl, the screening is referred to by the different pore size with uniform pore openings
Sieve, by the after-smithing petroleum coke for having crushed, on request rank is separated.
In above-mentioned technical proposal, in step s 4, the cool material equipment is kneading formula.
In above-mentioned technical proposal, in step s 5, the products formed inspection include test volume density, outward appearance tap,
Dissect.
In above-mentioned technical proposal, in the step s 7, the impregnation technology is as follows：Roasting product removing surface is clean；In advance
Heat, 0-270 DEG C freely heat up, 270-330 DEG C rise 10 DEG C, 330 DEG C of constant temperature 8 hours per hour；Preheated roasting product is proceeded to
In impregnating autoclave；0.086Mpa evacuation 60-90 minutes；140-160 DEG C of Colophonium of note；Pressurization 1.7-1.85MPa, pressurize 6 hours；Return
Colophonium is returned, more than 60 DEG C water of note are cooled down.
In above-mentioned technical proposal, in step s 9, the inspection of the graphitization product includes that outward appearance is tapped, resistivity is surveyed
Examination, sampling and testing.
The preparation method of metal furnaces graphite liner of the present invention, by adopting calcined petroleum coke for aggregate, coal tar pitch is viscous
Knot agent, through raw material is broken, dispensing, kneading, dry in the air material, vibration moulding, roasting, dipping, after baking, graphitization, machining
A kind of Gao Timi, low pore, high temperature resistant, corrosion-resistant, the oxidation-resistant graphite material produced etc. series of process process, this
Graphite liner material greatly improves the indices of graphite liner so as to which service life is greatly increased, and solves corrosion-resistant, resistance to
Mill property, anti-folding, resistance to compression difference and using the low problem of temperature.
Description of the drawings
Fig. 1 is the preparation method schematic flow sheet of metal furnaces graphite liner of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example is applied, the scope of protection of the invention is belonged to.
As shown in figure 1, a kind of preparation method of metal furnaces graphite liner of the present invention, comprises the following steps：
Step S1, raw material are crushed, broken in carrying out to bulk after-smithing petroleum coke, pulverizing, screening process；In this step S1, must be right
Bulk after-smithing petroleum coke is broken in carrying out, pulverizing, screening process.Wherein, it is broken in typically refer to the material of 50mm or so by hammer
The disintegrating apparatus such as formula disintegrating machine are further crushed to the granularity material of the 0.5-15mm needed for dispensing；And pulverizing is referred to by Raymond mill
Carbonaceous raw material is milled down to the equipment such as powder machine the short grained process of powder below 0.12mm or 0.075mm particle diameters；Screening is
Refer to the sieve by the different pore size with uniform pore openings, the calcined coke for having crushed rank on request is separated.
Step S2, dispensing, according to after-smithing petroleum coke 80%, the ratio of Coal-tar Pitch 20% is calculated respectively, weighed then
Collocation；In this step S2, formula the most closelypacked is determined with the method for loose specific weight, according to after-smithing petroleum coke 80%（Grain
Degree is respectively 0.8mm, 0.5mm, 0.075mm）, coal tar pitch 20% formula proportion carry out weighing collocation.
Step S3, kneading, by the raw material stirring mix homogeneously matched in above-mentioned steps, are kneaded into plasticity thickener, its
In, the requirement of kneading is dry-mixed 25-40min, wet mixing 50-60min.
Step S4, dry in the air material, the good thickener of kneading is transported in the cool material equipment of kneading formula, by unnecessary flue gas and volatile matters
Discharge with heat, make to be reduced with the temperature difference of binding agent；It is described to dry in the air material temperature degree for 90-110 DEG C in this step S4, it is viscous to increase
Knot power, makes thickener lumpiness uniformly beneficial to molding, dries in the air the material time for 25-30min.
Step S5, vibration moulding, the thickener for drying well are fitted in prefabricated mould, using the pressure of 3-5MPa, precompressed
5min, it is qualified that Vibration on Start-up platform carries out being tested whether after pressing when shaking using the pressure of 8-12MPa；Wherein, the products formed
Inspection includes that test volume density, outward appearance are tapped, dissected.
Step S6, roasting, qualified products formed is placed in ring-form calcining furnace, adds inserts, and heat up sintering, fixed
Products formed shape, makes coal tar pitch be carbonized；In this step S6, the roasting heating curve and technological temperature be, a roasting 600
Hour, 1100 DEG C, after baking 500 hours, 900 DEG C.The inspection of roasting product includes outward appearance percussion, bulk density, pressure resistance
Degree, internal structure are dissected.
Step S7, dipping, roasting product are positioned in horizontal impregnating autoclave, by liquid under desired technological temperature and pressure
Impregnating agent is immersed in roasting product hole, is reduced the porosity of roasting product, is increased bulk density and mechanical strength, wearability, resistance to
Corrosivity, improve its conductive and heat conductivility, and the impregnation technology is as follows：
Roasting product removing surface is clean 1.；
2. preheat, 0-270 DEG C freely heat up, 270-330 DEG C of 10 DEG C of liter, 330 DEG C of constant temperature 8 hours per hour；
3. preheated roasting product is proceeded in impregnating autoclave；
4.0.086Mpa evacuation 60-90 minutes；
5. 140-160 DEG C of Colophonium of note；
6. pressurize 1.7-1.85MPa, pressurize 6 hours；
7. Colophonium is returned, and more than 60 DEG C water of note are cooled down；
Wherein, the dipping rate of body weight gain formula that the pickled product is checked is as follows：
G=(W2-W1)/W1 × 100%, single-steeping product rate of body weight gain >=15%, double-steeping product rate of body weight gain >=10%.
Step S8, graphitization, the good roasting product of stain agent is placed in acheson furnace, energization 60-80 hours, is risen
Temperature makes amorphous Turbostratic charcoal change into three-dimensional order graphite crystalline structure to 2800-3000 DEG C；
Here graphited purpose and effect are as follows：
1. the conduction of high Carbon Materials, heat conductivity（Resistivity reduces 4-5 times, and heat conductivity improves about 10 times）；
2. the heat resistanceheat resistant for improving Carbon Materials is shaken performance and chemical stability（Linear expansion coefficient reduces 50-80%）；
3. make Carbon Materials that there is lubricity and wear resistence；
4. impurity is discharged, the purity of Carbon Materials is improved（The ash of product drops to 0.3% or so by 0.5-0.8%）.
And graphitizing process is specific as follows：
The graphitization of Carbon Materials is carried out under 2300-3000 DEG C of high temperature, therefore industrial only by Electric heating ability
Realize, i.e., directly by heated roasting product, it is both to produce high temperature by electric current at this moment to load the roasting product in stove to electric current
Conductor, is again the object for being heated to high temperature.The control of process of graphitization is to determine mutually to be fitted with ramp case by thermometric
The electric power curves answered are controlled, and conduction time acheson furnace 60-80 hour, unit consumption is controlled to 3200-3600KWh；
The inspection of graphitization product includes outward appearance percussion, resistivity measurement, sampling and testing.
Step S9, machining, are cut off, the machinery of planar end surface, the car conical surface and fluting adds to the finished product after graphitization
Work process and check, the inspection of finished product graphite liner here include precision, weight, length, diameter, bulk density, resistivity,
Prepackage quality of fit etc..
The preparation method of metal furnaces graphite liner of the present invention, by adopting calcined petroleum coke for aggregate, coal tar pitch is viscous
Knot agent, through raw material is broken, dispensing, kneading, dry in the air material, vibration moulding, roasting, dipping, after baking, graphitization, machining
A kind of Gao Timi, low pore, high temperature resistant, corrosion-resistant, the oxidation-resistant graphite material produced etc. series of process process, this
Graphite liner material greatly improves the indices of graphite liner so as to which service life is greatly increased, and solves corrosion-resistant, resistance to
Mill property, anti-folding, resistance to compression difference and using the low problem of temperature.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (7)
1. a kind of preparation method of metal furnaces graphite liner, it is characterised in that：Comprise the following steps：
S1, raw material are crushed, and bulk after-smithing petroleum coke is carried out being crushed to the granularity of 0.5-15mm, wears into 0.12mm or 0.075mm
Powder little particle below particle diameter is sieved again；
S2, dispensing, according to after-smithing petroleum coke 80%, the ratio of Coal-tar Pitch 20% is calculated respectively, weighed and then collocation；
S3, kneading, by the raw material stirring mix homogeneously matched in above-mentioned steps, are kneaded into plasticity thickener, wherein, it is dry-mixed
25-40min, wet mixing 50-60min；
S4, dry in the air material, and the good thickener of kneading is transported in cool material equipment, and temperature is 90-110 DEG C, and the time is 25-30min, will
Unnecessary flue gas and volatile matters and heat are discharged, and make to be reduced with the temperature difference of binding agent；
S5, vibration moulding, the thickener for drying well is fitted in prefabricated mould, using the pressure of 3-5MPa, precompressed 5min, is started
It is qualified that vibration platen carries out being tested whether after pressing when shaking using the pressure of 8-12MPa；
S6, roasting, qualified products formed is placed in ring-form calcining furnace, adds inserts, and heat up sintering, a roasting
600h, 1100 DEG C, after baking 500h, 900 DEG C, fixed-type product shape makes coal tar pitch be carbonized；
S7, dipping, roasting product is positioned in horizontal impregnating autoclave, curve intensification roasting, and liquid impregnating agent is soaked in evacuation pressurization
Enter in roasting product hole；Impregnating rate of body weight gain formula is：G=(W2-W1)/W1 × 100%,
Wherein, single-steeping product rate of body weight gain >=15%, double-steeping product rate of body weight gain >=10%；
S8, graphitization, the good roasting product of stain agent is placed in acheson furnace, and energization 60-80h is warming up to 2800-
3000 DEG C, amorphous Turbostratic charcoal is set to change into three-dimensional order graphite crystalline structure；
S9, machining, the finished product after graphitization is cut off, the machining processes of planar end surface, the car conical surface and fluting and
Check.
2. the preparation method of a kind of metal furnaces graphite liner according to claim 1, it is characterised in that：In step S1
In, carbonaceous raw material is milled down to by raymond mill for the powder little particle below 0.12mm or 0.075mm particle diameters.
3. the preparation method of a kind of metal furnaces graphite liner according to claim 1, it is characterised in that：In step S1
In, the screening refers to sieve by the different pore size with uniform pore openings, by the after-smithing petroleum coke for having crushed level on request
Do not separate.
4. the preparation method of a kind of metal furnaces graphite liner according to claim 1, it is characterised in that：In step S4
In, the cool material equipment is kneading formula.
5. the preparation method of a kind of metal furnaces graphite liner according to claim 1, it is characterised in that：In step S5
In, the products formed inspection includes that test volume density, outward appearance are tapped, dissected.
6. the preparation method of a kind of metal furnaces graphite liner according to claim 1, it is characterised in that：In step S7
In, the impregnation technology is as follows：
Roasting product removing surface is clean；
Preheating, 0-270 DEG C freely heat up, 270-330 DEG C of 10 DEG C of liter, 330 DEG C of constant temperature 8 hours per hour；
Preheated roasting product is proceeded in impregnating autoclave；
0.086Mpa evacuation 60-90 minutes；
140-160 DEG C of Colophonium of note；
Pressurization 1.7-1.85MPa, pressurize 6 hours；
Colophonium is returned, more than 60 DEG C water of note are cooled down.
7. the preparation method of a kind of metal furnaces graphite liner according to claim 1, it is characterised in that：In step S9
In, the inspection of the graphitization product includes outward appearance percussion, resistivity measurement, sampling and testing.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107337460A (en) * | 2017-07-13 | 2017-11-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Refractory aggregate and preparation method thereof and flame-proof thermal insulation material |
| CN107887612A (en) * | 2017-11-16 | 2018-04-06 | 天津锦美碳材科技发展有限公司 | A kind of processing method of graphite bipolar plate of fuel battery |
| CN109400212A (en) * | 2018-11-15 | 2019-03-01 | 安阳市佰士特异型石墨制品有限责任公司 | A kind of graphite oxidation-resistant material and graphite material and preparation method |
| CN109879668A (en) * | 2019-04-19 | 2019-06-14 | 平顶山东方碳素股份有限公司 | A kind of composition of raw materials and its preparation flow for silicon carbide blast furnace carbon brick |
| CN109970458A (en) * | 2017-12-28 | 2019-07-05 | 蓝星硅材料有限公司 | A kind of modified carbonaceous chute and preparation method thereof |
| CN112611174A (en) * | 2020-11-30 | 2021-04-06 | 扬州大学 | Multi-energy complementary drying control system |
| CN117800743A (en) * | 2024-02-28 | 2024-04-02 | 淄博大陆石墨科技有限公司 | Roasting method of carbon impregnated product |
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| CN105237006A (en) * | 2015-10-20 | 2016-01-13 | 大同新成新材料股份有限公司 | Method for preparing graphite furnace lining for submerged arc furnace |
| CN105967718A (en) * | 2016-07-08 | 2016-09-28 | 南通扬子碳素股份有限公司 | Graphite anode for heavy current resistant magnesium electrolysis and preparation process thereof |
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| CN102249237A (en) * | 2010-12-20 | 2011-11-23 | 龚炳生 | Graphite crucible |
| CN105237006A (en) * | 2015-10-20 | 2016-01-13 | 大同新成新材料股份有限公司 | Method for preparing graphite furnace lining for submerged arc furnace |
| CN105967718A (en) * | 2016-07-08 | 2016-09-28 | 南通扬子碳素股份有限公司 | Graphite anode for heavy current resistant magnesium electrolysis and preparation process thereof |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107337460A (en) * | 2017-07-13 | 2017-11-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Refractory aggregate and preparation method thereof and flame-proof thermal insulation material |
| CN107337460B (en) * | 2017-07-13 | 2020-08-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Refractory aggregate, preparation method thereof and refractory heat-insulating material |
| CN107887612A (en) * | 2017-11-16 | 2018-04-06 | 天津锦美碳材科技发展有限公司 | A kind of processing method of graphite bipolar plate of fuel battery |
| CN109970458A (en) * | 2017-12-28 | 2019-07-05 | 蓝星硅材料有限公司 | A kind of modified carbonaceous chute and preparation method thereof |
| CN109400212A (en) * | 2018-11-15 | 2019-03-01 | 安阳市佰士特异型石墨制品有限责任公司 | A kind of graphite oxidation-resistant material and graphite material and preparation method |
| CN109400212B (en) * | 2018-11-15 | 2021-08-10 | 安阳市佰士特异型石墨制品有限责任公司 | Graphite oxidation resistant material, graphite material and preparation method |
| CN109879668A (en) * | 2019-04-19 | 2019-06-14 | 平顶山东方碳素股份有限公司 | A kind of composition of raw materials and its preparation flow for silicon carbide blast furnace carbon brick |
| CN112611174A (en) * | 2020-11-30 | 2021-04-06 | 扬州大学 | Multi-energy complementary drying control system |
| CN112611174B (en) * | 2020-11-30 | 2022-10-11 | 扬州大学 | Multi-energy complementary drying control system |
| CN117800743A (en) * | 2024-02-28 | 2024-04-02 | 淄博大陆石墨科技有限公司 | Roasting method of carbon impregnated product |
| CN117800743B (en) * | 2024-02-28 | 2024-05-28 | 淄博大陆石墨科技有限公司 | Roasting method of carbon impregnated product |
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