CN107986802A - Mineral hot furnace graphite-based furnace lining for smelting red mud and preparation method thereof - Google Patents

Mineral hot furnace graphite-based furnace lining for smelting red mud and preparation method thereof Download PDF

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CN107986802A
CN107986802A CN201711227300.3A CN201711227300A CN107986802A CN 107986802 A CN107986802 A CN 107986802A CN 201711227300 A CN201711227300 A CN 201711227300A CN 107986802 A CN107986802 A CN 107986802A
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weight
parts
furnace
furnace lining
graphite
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陈士朝
边妙莲
孙辉
马冬阳
曹志成
吴道洪
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Jiangsu Province Metallurgical Design Institute Co Ltd
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Jiangsu Province Metallurgical Design Institute Co Ltd
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    • 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
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    • 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
    • C04B35/528—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 obtained from carbonaceous particles with or without other non-organic components
    • C04B35/532—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 obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
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    • 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
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    • 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
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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    • 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
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • 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
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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    • 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
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
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    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
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Abstract

The present invention relates to a kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud and preparation method thereof.The furnace lining is made of the component of following proportioning：10 30 parts by weight of alumina fibre, 5 15 parts by weight of alumina powder, 0.1 10 parts by weight of zirconium oxide micro mist, 0.1 10 parts by weight of fine magnesium oxide micro-powder, 50 70 parts by weight of after-smithing petroleum coke, 10 20 parts by weight of coal tar pitch, 5 15 parts by weight of asphalt.The preparation method of the furnace lining is realized by component premix, material mixing, molding, roasting and the graphitization of said ratio.The graphite-based furnace lining of the present invention has the advantages that alkali resistance is good, and thermal conductivity factor is high；Simultaneously because alumina fibre coated alumina micro mist, zirconium oxide micro mist and fine magnesium oxide micro-powder and the graphite material of furnace lining can be protected to be not easy to be aoxidized, so the antioxygenic property of graphite-based furnace lining of the present invention is good；In addition the present invention causes furnace lining wearability and intensity to be significantly improved under the action of fiber reinforcement.

Description

Mineral hot furnace graphite-based furnace lining for smelting red mud and preparation method thereof
Technical field
The invention belongs to utilize refractory material production field, and relate more specifically to a kind of ore deposit heat for being used to smelt red mud Stove graphite-based furnace lining and preparation method thereof.
Background technology
Red mud is the byproduct for producing alumina process, often produces the red mud that 1 ton of aluminium oxide about discharges 1.5-2 tons, red mud Middle TFe contents are about 15-30%, have recyclable value, simultaneously because red mud has strong basicity, long-term stacking is easily led Cause serious environmental problem.During using mine heat furnace smelting red mud, due in red mud the sodium salt containing strong basicity cause it is general Logical refractory material corrodes seriously, seriously affects mineral hot furnace furnace life and economic benefit.
Graphite-based refractory material has the advantages that alkali resistance is good, and thermal conductivity factor is high, but oxidizable there is also furnace lining Shortcoming, in consideration of it, invented a kind of smelting red mud that is suitable for has the good mineral hot furnace graphite-based fire resisting of antioxygenic property at the same time Material.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of mineral hot furnace graphite-based for being suitable for smelting red mud, with resistance to Caustic slag erosion and the good furnace lining of antioxygenic property and preparation method thereof.
To achieve these goals, the present invention adopts the following technical scheme that：
According to an aspect of the present invention, there is provided a kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, the mineral hot furnace stone Black base furnace lining is made of the component of following proportioning：Alumina fibre 10-30 parts by weight, alumina powder 5-15 parts by weight, oxidation Zirconium micro mist 0.1-10 parts by weight, fine magnesium oxide micro-powder 0.1-10 parts by weight, after-smithing petroleum coke 50-70 parts by weight, coal tar pitch 10-20 weights Measure part, asphalt 5-15 parts by weight.
According to one embodiment of present invention, which is made of the component of following proportioning：Aluminium oxide Fiber 15-20 parts by weight, alumina powder 5-10 parts by weight, zirconium oxide micro mist 0.1-5 parts by weight, fine magnesium oxide micro-powder 0.1-5 weights Measure part, after-smithing petroleum coke 50-60 parts by weight, coal tar pitch 10-15 parts by weight, asphalt 8-12 parts by weight.
According to one embodiment of present invention, a diameter of 4-10 μm of alumina fibre, fibre length 10-60mm；Oxidation Aluminium grain size of micropowder is 0.045-0.3mm；Zirconium oxide grain size of micropowder is 0.045-0.3mm；Fine magnesium oxide micro-powder particle diameter is 0.045- 0.3mm；The particle diameter of after-smithing petroleum coke is less than 1mm.
According to one embodiment of present invention, coal tar pitch is ash content no more than 0.3% and moisture is not more than 5% high-temperature coal Pitch.
According to one embodiment of present invention, the density of asphalt is 1.0-1.1g/cm3。
According to one embodiment of present invention, a diameter of 5-7 μm of alumina fibre, fibre length 20-40mm；Aluminium oxide Grain size of micropowder is 0.075-0.15mm；Zirconium oxide grain size of micropowder is 0.075-0.15mm；Fine magnesium oxide micro-powder particle diameter is 0.075- 0.15mm；The particle diameter of after-smithing petroleum coke is less than 0.85mm.
According to another aspect of the present invention, there is provided a kind of preparation side for the mineral hot furnace graphite-based furnace lining for being used to smelt red mud Method, this method comprise the following steps：
1) premix：Alumina fibre, alumina powder, zirconium oxide micro mist and fine magnesium oxide micro-powder are placed in batch mixer and mixed It is even, then add asphalt and be stirred at high temperature to uniform；
2) batch mixing：The homogeneous material obtained in step 1) and after-smithing petroleum coke are added in coal tar pitch and stirred and evenly mixed；
3) it is molded：The mixing material that step 2) obtains is sent to former, will be mixed by pressure in former Material is extruded to furnace lining bricks die, and vibrating in extrusion makes mixing material be completely embedded to form backup lining brick with mould inner wall, together When make backup lining brick closely knit；
4) roast：The backup lining brick that step 3) is obtained carries out baking operation in roaster；
5) graphitization：Backup lining brick after step 4) is roasted carries out graphitization technique in graphitizing furnace, treats graphite chemical industry Mineral hot furnace graphite-based furnace lining is made in cooling down after the completion of skill.
According to one embodiment of present invention, the whipping temp in step 1) premix is 80-120 DEG C, mixing time 15- 30min；Whipping temp in step 2) batch mixing is 100-160 DEG C, mixing time 20-40min；It is molded and sets in step 3) shaping Standby extrusion pressure is 1-3MPa, and briquetting pressure of vibrating is 8-15MPa.
According to one embodiment of present invention, the temperature schedule of roaster is in step 4)：25-200 DEG C of heating roasting 12h, 650-1050 DEG C of 24h, 12h, 200-650 DEG C of heating roasting 24h of 200 DEG C of constant temperature calcinings, 650 DEG C of constant temperature calcinings heating roastings 24h, 1200-300 DEG C of 48h, 24h, 1050-1200 DEG C of heating roasting 24h of 1050 DEG C of constant temperature calcinings, 1200 DEG C of constant temperature calcinings coolings Roast 48h, 300 DEG C to room temperature carry out natural cooling.
According to one embodiment of present invention, the mode of heating of roaster for burner noz(zle) extend into burner hearth centre into Row combustion heating；Thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, upper furnace close to furnace lining position.
According to one embodiment of present invention, burner noz(zle) uses gas nozzle.
According to one embodiment of present invention, inert atmosphere of the graphitization technique in 2000-3300 DEG C of temperature in step 5) Under, using resistance heating manner.
By using above-mentioned technical proposal, the present invention has the following advantages that compared with the prior art：
The graphite-based furnace lining of the present invention has the advantages that alkali resistance is good, and thermal conductivity factor is high；Simultaneously because aluminium oxide is fine Tie up coated alumina micro mist, zirconium oxide micro mist and fine magnesium oxide micro-powder and the graphite material of furnace lining can be protected to be not easy to be aoxidized, institute It is good with the antioxygenic property of graphite-based furnace lining of the present invention；In addition the present invention causes furnace lining wearability under the action of fiber reinforcement It is significantly improved with intensity.
Embodiment
It should be appreciated that shown the embodiment of the present invention is merely illustrative in the exemplary embodiment.Although in this hair Only a small number of embodiments are described in detail in bright, but those skilled in the art are readily appreciated that and depart from the present invention in not essence In the case of the teaching of theme, a variety of modifications are feasible.Correspondingly, all such modifications should all be included in the present invention's In the range of.Without departing from the spirit of the invention, design, operating condition and ginseng that can be to following exemplary embodiment Number etc. makes others and replaces, changes, changes and delete.
The present invention provides a kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, and the mineral hot furnace graphite-based furnace lining is by following Component forms：
Alumina fibre, preferably a diameter of 4-10 μm, 5-7 μm；Fibre length is 10-60mm, preferably 20-40mm；Oxidation Aluminum fiber is 10-30 parts by weight, preferably 15-20 parts by weight；
Alumina powder, preferably particle diameter 0.045-0.3mm, 0.075-0.15mm；Alumina powder is 5-15 parts by weight, It is preferred that 5-10 parts by weight；
Zirconium oxide micro mist, preferably particle diameter 0.045-0.3mm, 0.075-0.15mm；Zirconium oxide micro mist is 0.1-10 weight Part, preferably 0.1-5 parts by weight；
Fine magnesium oxide micro-powder, preferably particle diameter 0.045-0.3mm, 0.075-0.15mm；Fine magnesium oxide micro-powder is 0.1-10 weight Part, preferably 0.1-5 parts by weight；
After-smithing petroleum coke, particle diameter are less than 1mm, and preferable particle size is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm；Forge Petroleum coke is 50-70 parts by weight, preferably 50-60 parts by weight afterwards；
The coal tar pitch of coal tar pitch, preferably ash content≤0.3%, moisture≤5%；Coal tar pitch is 10-20 parts by weight, preferably 10-15 parts by weight.
Asphalt, preferred density 1.0-1.1g/cm3Pitch；Asphalt is 5-15 parts by weight, and preferably 8-12 is heavy Measure part.
In said components, alumina fibre is used as skeleton in furnace lining, into distributed in grid, can strengthen the strong of furnace lining Degree；Aluminium oxide, zirconium oxide, fine magnesium oxide micro-powder are attached on alumina fibre skeleton, play the performances such as anticorrosive, shock resistance；Stone Oil asphalt and coal tar pitch play the role of cohesive alumina fibre and aluminium oxide, zirconium oxide, fine magnesium oxide micro-powder, while are also graphite Carbonaceous source during change；After-smithing petroleum coke is the main source of graphitization carbonaceous.
In addition, the present invention also provides a kind of preparation method for the mineral hot furnace graphite-based furnace lining for being used to smelt red mud, this method Comprise the following steps：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 80-120 DEG C, and preferably whipping temp is 90-110 DEG C, 15-30min is to uniform for stirring.
Make its mixing equal by the way that alumina fibre and alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder are stirred It is even, while can realize that alumina powder, zirconium oxide micro mist and fine magnesium oxide micro-powder are fully attached in alumina fibre.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 100-160 DEG C, and preferably whipping temp is 130-150 DEG C, and mixing time is 20-40min to stirring evenly.
Alumina fibre even dispersion plays skeleton function in coal tar pitch.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit, and former material extrusion pressure limit is 1-3MPa, and briquetting pressure of vibrating scope is 8-15MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.
The moisture in backup lining brick and volatile matter is set to volatilize at high temperature, the temperature schedule of the roaster is 25-200 DEG C (24h)、200-200℃(12h)、200-650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050 DEG C (24h), 1050-1200 (24h), 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings)；Roasting Burn stove heat mode and extend into burner hearth centre progress combustion heating for burner noz(zle), thermometric mode is thermocouple temperature measurement, is surveyed Warm spot is preferably in burner hearth bottom, furnace wall, upper furnace close to furnace lining position；Burner noz(zle) uses gas nozzle, preferably natural gas Nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to graphitization technique in Acheson's type graphitizing furnace.
Graphitization technique refers to that carbon atom unstable at high temperature realizes having from Turbostratic to crystal structure of graphite Sequence converts；Graphitization technique is under the inert atmosphere of 2000-3300 DEG C of temperature, using resistance heating manner；Graphitization completes drop Warm to room temperature the graphite-based furnace lining that mineral hot furnace is made.
Below by specific embodiment, the present invention is described in detail.
Embodiment 1
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, it is composed of the following components：
Alumina fibre, 7 μm of diameter, fibre length 20mm, 20 parts by weight；
Alumina powder, particle diameter 0.1mm, 10 parts by weight；
Zirconium oxide micro mist, particle diameter 0.15mm, 4 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.15mm, 4 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 50 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 12 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 10 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said components, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 110 DEG C, and stirring 30min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 130 DEG C, and mixing time is 20min to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 3MPa, and briquetting pressure of vibrating is 15MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C of (12h), 200- 650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200(24h)、 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating extend into for burner noz(zle) Burner hearth centre carries out combustion heating, and thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, upper furnace Close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to graphitization technique in Acheson's type graphitizing furnace.Stone Black chemical industry skill is under the argon gas atmosphere of 3000 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and is made The graphite-based furnace lining of mineral hot furnace.
Embodiment 2
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, is made of the component of following proportioning：
Alumina fibre, 6 μm of diameter, fibre length 30mm, 17 parts by weight；
Alumina powder, particle diameter 0.08mm, 12 parts by weight；
Zirconium oxide micro mist, particle diameter 0.07mm, 2 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.08mm, 3 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 55 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 13 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 12 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said components, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 120 DEG C, and stirring 25min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 120 DEG C, and mixing time 40min is to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 2MPa, and briquetting pressure of vibrating is 12MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C of (12h), 200- 650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200(24h)、 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating extend into for burner noz(zle) Burner hearth centre carries out combustion heating, and thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, upper furnace Close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to graphitization technique in Acheson's type graphitizing furnace.Stone Black chemical industry skill is under the argon gas atmosphere of 2800 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and is made The graphite-based furnace lining of mineral hot furnace.
Embodiment 3
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, it is composed of the following components：
Alumina fibre, 5 μm of diameter, fibre length 40mm, 15 parts by weight；
Alumina powder, particle diameter 0.08mm, 13 parts by weight；
Zirconium oxide micro mist, particle diameter 0.06mm, 2 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.07mm, 2 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 55 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 11 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 13 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said ratio component, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 90 DEG C, and stirring 40min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 140 DEG C, and mixing time is 25min to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 2MPa, and briquetting pressure of vibrating is 11MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C (12h), 200-650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200 (24h), 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating is burner noz(zle) It extend into burner hearth centre and carries out combustion heating, thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, stove Thorax top is close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to graphitization technique in Acheson's type graphitizing furnace.Stone Black chemical industry skill is under the argon gas atmosphere of 2600 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and is made The graphite-based furnace lining of mineral hot furnace.
Embodiment 4
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, it is composed of the following components：
Alumina fibre, 7 μm of diameter, fibre length 20mm, 20 parts by weight；
Alumina powder, particle diameter 0.15mm, 10 parts by weight；
Zirconium oxide micro mist, particle diameter 0.15mm, 4 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.15mm, 4 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 50 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 15 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 10 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said components, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 110 DEG C, and stirring 30min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 130 DEG C, and mixing time is 20min to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 3MPa, and briquetting pressure of vibrating is 15MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C of (12h), 200- 650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200(24h)、 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating extend into for burner noz(zle) Burner hearth centre carries out combustion heating, and thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, upper furnace Close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to Acheson's type graphitizing furnace and carries out graphitization technique. Graphitization technique is under the argon gas atmosphere of 3000 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and makes Into the graphite-based furnace lining of mineral hot furnace.
Embodiment 5
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, is made of the component of following proportioning：
Alumina fibre, 6 μm of diameter, fibre length 30mm, 17 parts by weight；
Alumina powder, particle diameter 0.075mm, 12 parts by weight；
Zirconium oxide micro mist, particle diameter 0.075mm, 5 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.08mm, 3 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 55 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 15 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 12 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said components, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 120 DEG C, and stirring 25min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 120 DEG C, and mixing time 40min is to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 2MPa, and briquetting pressure of vibrating is 12MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C of (12h), 200- 650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200(24h)、 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating extend into for burner noz(zle) Burner hearth centre carries out combustion heating, and thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, upper furnace Close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to graphitization technique in Acheson's type graphitizing furnace.Stone Black chemical industry skill is under the argon gas atmosphere of 2800 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and is made The graphite-based furnace lining of mineral hot furnace.
Embodiment 6
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, it is composed of the following components：
Alumina fibre, 5 μm of diameter, fibre length 40mm, 15 parts by weight；
Alumina powder, particle diameter 0.08mm, 13 parts by weight；
Zirconium oxide micro mist, particle diameter 0.08mm, 2 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.075mm, 5 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 55 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 12 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 13 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said ratio component, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 90 DEG C, and stirring 40min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 140 DEG C, and mixing time is 25min to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 2MPa, and briquetting pressure of vibrating is 11MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C (12h), 200-650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200 (24h), 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating is burner noz(zle) It extend into burner hearth centre and carries out combustion heating, thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, stove Thorax top is close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to Acheson's type graphitizing furnace and carries out graphitization technique. Graphitization technique is under the argon gas atmosphere of 2600 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and makes Into the graphite-based furnace lining of mineral hot furnace.
Embodiment 7
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, it is composed of the following components：
Alumina fibre, 4 μm of diameter, fibre length 10mm, 10 parts by weight；
Alumina powder, particle diameter 0.045mm, 15 parts by weight；
Zirconium oxide micro mist, particle diameter 0.3mm, 0.1 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.3mm, 0.1 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 70 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 20 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 5 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said ratio component, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 80 DEG C, and stirring 30min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 150 DEG C, and mixing time is 20min to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 1MPa, and briquetting pressure of vibrating is 15MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C (12h), 200-650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200 (24h), 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating is burner noz(zle) It extend into burner hearth centre and carries out combustion heating, thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, stove Thorax top is close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to graphitization technique in Acheson's type graphitizing furnace.Stone Black chemical industry skill is under the argon gas atmosphere of 2000 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and is made The graphite-based furnace lining of mineral hot furnace.
Embodiment 8
A kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, it is composed of the following components：
Alumina fibre, 10 μm of diameter, fibre length 60mm, 30 parts by weight；
Alumina powder, particle diameter 0.3mm, 5 parts by weight；
Zirconium oxide micro mist, particle diameter 0.045mm, 10 parts by weight；
Fine magnesium oxide micro-powder, particle diameter 0.045mm, 10 parts by weight；
After-smithing petroleum coke, it is less than the low-ash after-smithing petroleum coke of low-sulfur of 0.85mm, 60 parts by weight for particle diameter；
Coal tar pitch, it is ash content≤0.3%, the coal tar pitch of moisture≤5%, 8 parts by weight；
Asphalt, it is that density is 1.0-1.1g/cm3Pitch, 15 parts by weight.
Using the preparation method for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud of said ratio component, step is：
Step 1. premixes：By alumina fibre, alumina powder, zirconium oxide micro mist, fine magnesium oxide micro-powder in mixed in batch mixer It is even；Powder after mixing adds asphalt and is stirred under high temperature, and whipping temp is 120 DEG C, and stirring 15min is to uniform.
Step 2. batch mixing：To premix obtained uniform raw material and after-smithing petroleum coke be added in coal tar pitch be stirred it is mixed Even, whipping temp is 130 DEG C, and mixing time is 40min to stirring evenly.
Step 3. is molded：The mixture stirred evenly is sent to former, former and is squeezed mixture by pressure Go out to furnace lining bricks die, vibrating in extrusion makes mixture be completely embedded to form backup lining brick with mould inner wall, while makes furnace lining Brick is closely knit；Former material extrusion pressure is 3MPa, and briquetting pressure of vibrating is 8MPa.
Step 4. roasts：Molding backup lining brick needs to carry out baking operation in roaster.Make at high temperature in backup lining brick Moisture and volatile matter volatilize, the temperature schedule of the roaster is 25-200 DEG C (24h), 200-200 DEG C (12h), 200-650℃(24h)、650-650℃(12h)、650-1050℃(48h)、1050-1050℃(24h)、1050-1200 (24h), 1200-1200h (24h), 1200-300 DEG C (48h), 300 to room temperature (natural coolings).Mode of heating is burner noz(zle) It extend into burner hearth centre and carries out combustion heating, thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, stove Thorax top is close to furnace lining position.Burner noz(zle) uses natural gas nozzle.
Step 5. graphitization：Backup lining brick after the completion of roasting is subjected to graphitization technique in Acheson's type graphitizing furnace.Stone Black chemical industry skill is under the argon gas atmosphere of 3300 DEG C of temperature, using resistance heating manner.Graphitization completion is cooled to room temperature and is made The graphite-based furnace lining of mineral hot furnace.
The foregoing is merely presently preferred embodiments of the present invention, is not used for limiting practical range of the invention；If do not take off From the spirit and scope of the present invention, to technical scheme is modified or replaced equivalently of the present invention, should all cover in the claims in the present invention Among protection domain.

Claims (10)

1. a kind of mineral hot furnace graphite-based furnace lining for being used to smelt red mud, it is characterised in that be made of the component of following proportioning：Oxidation Aluminum fiber 10-30 parts by weight, alumina powder 5-15 parts by weight, zirconium oxide micro mist 0.1-10 parts by weight, fine magnesium oxide micro-powder 0.1- 10 parts by weight, after-smithing petroleum coke 50-70 parts by weight, coal tar pitch 10-20 parts by weight, asphalt 5-15 parts by weight.
2. the mineral hot furnace graphite-based furnace lining according to claim 1 for being used to smelt red mud, it is characterised in that by following proportioning Component composition：Alumina fibre 15-20 parts by weight, alumina powder 5-10 parts by weight, zirconium oxide micro mist 0.1-5 parts by weight, Fine magnesium oxide micro-powder 0.1-5 parts by weight, after-smithing petroleum coke 50-60 parts by weight, coal tar pitch 10-15 parts by weight, asphalt 8-12 weights Measure part.
3. the mineral hot furnace graphite-based furnace lining according to claim 1 or 2 for being used to smelt red mud, it is characterised in that the oxygen Change a diameter of 4-10 μm of aluminum fiber, fibre length 10-60mm；The alumina powder particle diameter is 0.045-0.3mm；The oxygen It is 0.045-0.3mm to change zirconium grain size of micropowder；The fine magnesium oxide micro-powder particle diameter is 0.045-0.3mm；The grain of the after-smithing petroleum coke Footpath is less than 1mm.
4. the mineral hot furnace graphite-based furnace lining according to claim 1 or 2 for being used to smelt red mud, it is characterised in that the coal Pitch is ash content no more than 0.3% and moisture is not more than 5% coal tar pitch.
A kind of 5. preparation side for being used to smelt the mineral hot furnace graphite-based furnace lining of red mud as any one of claim 1-4 Method, it is characterised in that comprise the following steps：
1) premix：Alumina fibre, alumina powder, zirconium oxide micro mist and fine magnesium oxide micro-powder are placed in batch mixer by said ratio Interior mixing, the asphalt for then adding said ratio are stirred to uniform at high temperature；
2) batch mixing：The coal that the after-smithing petroleum coke of the homogeneous material obtained in step 1) and said ratio is added to said ratio drips Stirred and evenly mixed in green grass or young crops；
3) it is molded：The mixing material that step 2) obtains is sent to former, material will be mixed by pressure in former In extrusion to furnace lining bricks die, vibrating in extrusion makes mixing material be completely embedded to form backup lining brick with mould inner wall, makes at the same time Backup lining brick is closely knit；
4) roast：The backup lining brick that step 3) is obtained carries out baking operation in roaster；
5) graphitization：Backup lining brick after step 4) is roasted carries out graphitization technique in graphitizing furnace, treats that graphitization technique is complete Mineral hot furnace graphite-based furnace lining is made into rear cooling down.
6. according to the method described in claim 5, it is characterized in that, the whipping temp in the step 1) premix is 80-120 DEG C, mixing time 15-30min；Whipping temp in the step 2) batch mixing is 100-160 DEG C, mixing time 20- 40min；Former extrusion pressure is 1-3MPa in the step 3) shaping, and briquetting pressure of vibrating is 8-15MPa.
7. according to the method described in claim 5, it is characterized in that, the temperature schedule of roaster is in the step 4)：25- 200 DEG C of heating roasting 24h, 200 DEG C of constant temperature calcinings 12h, 200-650 DEG C of heating roasting 24h, 650 DEG C of constant temperature calcinings 12h, 650- 1050 DEG C of heating roasting 48h, 24h, 1050-1200 DEG C of heating roasting 24h of 1050 DEG C of constant temperature calcinings, 1200 DEG C of constant temperature calcining 24h, 1200-300 DEG C cooling roasting 48h, 300 DEG C to room temperature carry out natural cooling.
8. the method according to the description of claim 7 is characterized in that the mode of heating of the roaster extend into for burner noz(zle) Burner hearth centre carries out combustion heating；Thermometric mode is thermocouple temperature measurement, and temperature measuring point is in burner hearth bottom, furnace wall, upper furnace Close to furnace lining position.
9. according to the method described in claim 8, it is characterized in that, the burner noz(zle) uses gas nozzle.
10. according to the method described in claim 5, it is characterized in that, graphitization technique is in temperature 2000- in the step 5) Under 3300 DEG C of inert atmosphere, using resistance heating manner.
CN201711227300.3A 2017-11-29 2017-11-29 Mineral hot furnace graphite-based furnace lining for smelting red mud and preparation method thereof Pending CN107986802A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109852081A (en) * 2018-12-20 2019-06-07 淄博大陆石墨科技有限公司 The preparation method that vibration-compression molding special graphite is homogenized with thickener

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109852081A (en) * 2018-12-20 2019-06-07 淄博大陆石墨科技有限公司 The preparation method that vibration-compression molding special graphite is homogenized with thickener

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