CN110615673A - Corundum furnace tube preparation method - Google Patents
Corundum furnace tube preparation method Download PDFInfo
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- CN110615673A CN110615673A CN201911017565.XA CN201911017565A CN110615673A CN 110615673 A CN110615673 A CN 110615673A CN 201911017565 A CN201911017565 A CN 201911017565A CN 110615673 A CN110615673 A CN 110615673A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/243—Setting, e.g. drying, dehydrating or firing ceramic articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
- B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
- B28B21/12—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means tamping or ramming the material or the mould elements
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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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C—CHEMISTRY; METALLURGY
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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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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Abstract
The invention relates to the technical field of corundum furnace tube preparation, in particular to a corundum furnace tube preparation method, which sequentially comprises the steps of batching, mixing, ageing, beating and shaping, drying, firing and cooling, wherein the appearance of a wet blank is more regular and exquisite through a beating and forming process, and the elasticity of the wet blank can be improved; the drying is divided into primary drying and secondary drying, and after the primary drying is finished, demolding and secondary drying treatment are carried out, so that the stability of the wet blank after shaping can be improved; in the early stage, the temperature is raised at a low temperature stage at a low temperature rate, so that the uniformity of the temperature of the dry blank can be improved, the chapping phenomenon caused by uneven temperature in the early stage is avoided, and in the later stage after the moisture is basically dried, the temperature is raised to a large extent, so that the porosity can be reduced, the microcrystalline forming effect among materials is improved, and the sintering quality of the corundum furnace tube is improved; the mixing time of the powder is relatively reduced, and the phenomena of sedimentation and layering generated in the stirring process of the powder and the granules can be reduced.
Description
Technical Field
The invention relates to the technical field of corundum furnace tube preparation, in particular to a corundum furnace tube preparation method.
Background
When the corundum furnace tube is prepared by adopting the gypsum mold for slurry casting, the corundum raw material is required to be crushed and then prepared into slurry with fluidity, the slurry is poured into the gypsum mold for dehydration and drying, and the water in the slurry is absorbed by the water absorption effect of the gypsum mold, and then the drying and the blank removal are carried out. The method has the advantages that the water quantity is strictly controlled during slurry preparation, the drying period of a wet blank is longer, and the water content of a dry blank is high, so that the volume density of the furnace tube is reduced, the porosity is increased, and the service life and the service effect of the corundum furnace tube are reduced during firing.
Disclosure of Invention
The invention aims to provide a corundum furnace tube preparation method, which adopts white corundum of various grain grades as a raw material to be stirred and mixed, optimizes the particle accumulation degree of the material, and adopts a beating and shaping process to solve the problems of porosity increase and service life reduction caused by adopting a gypsum mould to carry out slurry pouring to prepare the corundum furnace tube.
In order to solve the technical problems, the invention adopts the following technical scheme:
the corundum furnace tube preparation method sequentially comprises the following preparation steps:
step a, batching: according to the mass percentage: selecting 6-10% of white jade diamonds with the particle size of 8 meshes, 12-16% of white jade diamonds with the particle size of 12 meshes, 8-10% of white jade diamonds with the particle size of 24 meshes, 7-10% of white jade diamonds with the particle size of 40 meshes, 8-11% of white jade diamonds with the particle size of 80 meshes, 8-11% of white jade diamonds with the particle size of 120 meshes, 8-10% of white jade diamonds with the particle size of 180 meshes, 8-10% of white jade diamonds with the particle size of 200 meshes, 15-20% of white jade diamonds with the particle size of 325 meshes, 8-10% of high-temperature calcined alumina powder with the particle size of 325 meshes and 0.5-1;
step b, mixing materials: b, placing the ingredients in the step a into a stirrer, stirring and mixing for 64-96 minutes at the speed of 40-60 revolutions per minute, and uniformly mixing;
step c, ageing: b, placing the uniformly mixed materials in the step b in a sealed space for ageing for 20-24 hours;
step d, making and shaping: c, pouring the material subjected to ageing into an assembled mould, tamping and sealing the mould; then, uniformly knocking the outer side of the die to make and shape the material in the die;
step e, drying: firstly, placing the molded die and the materials for 3-5 hours for preliminary drying; removing the mold, and drying the shaped wet blank in a closed space at 60-70 ℃ for 80-120 hours; obtaining a shaped dry blank;
step f, firing: e, placing the dry blank in the step e into a kiln, and then starting heating the kiln; the temperature rise process is as follows: raising the temperature within 100 ℃ per hour to 3-5 ℃, raising the temperature within 100 ℃ and 500 ℃ per hour to 5-10 ℃, raising the temperature above 500 ℃ per hour to 70-90 ℃ until the temperature in the kiln is raised to 1580 ℃ and 1750 ℃, and finishing the temperature raising process within 70-90 hours; after the temperature rise is finished, preserving the heat for 2.5 to 3.5 hours at the temperature of 1580-;
step g, cooling: and after firing is finished, stopping heating the kiln, reducing the temperature in the kiln to 80-120 ℃, opening the kiln, and taking out the fired furnace tube.
Further, in the step b, powder with the granularity of less than or equal to 200 meshes in the ingredients is placed in a stirrer to be stirred and mixed for 16-24 minutes at the speed of 40-60 revolutions per minute, and then other granular materials are all added in the stirrer to be stirred and mixed for 16-24 minutes at the same speed; and (3) adding 5-7% of water into the stirrer according to the mass percentage, continuously stirring and mixing for 32-48 minutes at the same speed, and uniformly mixing.
Further, in the step c, the uniformly mixed materials in the step b are placed in a plastic woven bag for sealing, and then ageing for 20-24 hours.
And step d, when the material trapped in the step c is poured into the mold, pouring the material in multiple times, namely tamping the material once after 15% -25% of the volume of the mold is poured each time until the mold is filled with the material, and sealing the mold.
Further, in the step d, when the charged mold is uniformly knocked on the outer side, the mold is manually knocked for 1800 times by manpower or continuously beaten for 60-90 minutes by an electric beating machine.
Further, in the step g, the cooling mode is natural cooling for 80-100 hours, or fan-assisted cooling for 35-50 hours.
Compared with the prior art, the invention can at least achieve one of the following beneficial effects:
1. the white corundum with various particle grades is adopted as a main raw material, and stirring and mixing are carried out, so that the particle accumulation degree of materials during mixing and shaping can be optimized; the corundum furnace tube has the effects of filling air holes and sealing air holes, and can improve the overall performance of the corundum furnace tube; the high-temperature calcined alumina powder has good high-temperature resistance, and is used as a reinforcing and toughening agent for the materials in the sintering process, so that the compactness, the smoothness, the cold and hot fatigue, the fracture toughness and the like are improved; the effect of filling air holes is achieved, and the high temperature resistance is over 1800 ℃; thereby improving the overall performance of the corundum furnace tube.
2. Through the forging and forming process, the appearance of the wet blank is more regular and delicate, and meanwhile, the elasticity of the wet blank can be improved.
3. The drying is divided into primary drying and secondary drying, and after the primary drying is finished, demolding and secondary drying treatment are carried out, so that the stability of the wet blank after shaping can be improved.
4. In the early stage, the temperature is raised at a low temperature stage at a low temperature rate, so that the uniformity of the temperature of the dry blank can be improved, the phenomenon of chapping caused by uneven temperature in the early stage is avoided, and in the later stage after the moisture is basically dried, the temperature is raised to a large extent, so that the porosity can be reduced, the microcrystalline forming effect among materials is improved, and the sintering quality of the corundum furnace tube is improved.
5. The powder with smaller granularity is mixed firstly, and then the material with larger granularity is mixed, which is equivalent to reducing the mixing time of the powder, and can reduce the phenomena of sedimentation and delamination generated in the stirring process of the powder and the particle materials.
6. The trapping material is sealed through the woven bag, the occupied space is saved, and meanwhile, the later-stage filling work is facilitated.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The corundum furnace tube preparation method sequentially comprises the following preparation steps:
step a, batching: according to the mass percentage: selecting 6-10% of white jade diamonds with the particle size of 8 meshes, 12-16% of white jade diamonds with the particle size of 12 meshes, 8-10% of white jade diamonds with the particle size of 24 meshes, 7-10% of white jade diamonds with the particle size of 40 meshes, 8-11% of white jade diamonds with the particle size of 80 meshes, 8-11% of white jade diamonds with the particle size of 120 meshes, 8-10% of white jade diamonds with the particle size of 180 meshes, 8-10% of white jade diamonds with the particle size of 200 meshes, 15-20% of white jade diamonds with the particle size of 325 meshes, 8-10% of high-temperature calcined alumina powder with the particle size of 325 meshes, 1.5-2.5% of superfine silicon powder and 0.;
in step a of the present invention:
typical but not limiting mass percentages of the 8-mesh white jade steel are as follows: 6%, 7%, 8%, 9% or 10%;
typical but not limiting mass percentages of the white jade steel with the particle size of 12 meshes are as follows: 12%, 13%, 14%, 15% or 16%;
typical but not limiting mass percentages of the white jade steel with the particle size of 24 meshes are as follows: 8%, 8.5%, 9%, 9.5% or 10%;
typical but not limiting mass percentages of 40 mesh baiyu steel are for example: 7%, 8%, 8.5%, 9% or 10%;
typical but not limiting mass percentages of 80 mesh baiyu steel are for example: 8%, 9%, 9.5%, 10% or 11%;
typical but not limiting mass percentages of the white jade steel with the particle size of 120 meshes are as follows: 8%, 9%, 9.5%, 10% or 11%;
typical but not limiting mass percentages of the white jade steel with the particle size of 180 meshes are as follows: 8%, 8.5%, 9%, 9.5% or 10%;
typical but not limiting mass percentages of the sapphire with the particle size of 200 meshes are as follows: 8%, 8.5%, 9%, 9.5% or 10%;
typical but not limiting mass percentages of the 325 mesh white jade diamonds are for example: 15%, 16.5%, 18%, 19% or 20%;
typical but not limiting mass percentages of the high-temperature calcined alumina powder with the particle size of 325 meshes are as follows: 8%, 8.5%, 9%, 9.5% or 10%;
preferably, 1.5-2.5% of superfine silicon powder can be added into the mixture; typical but not limiting mass percentages of the ultra-fine silicon powder are as follows: 1.5%, 1.7%, 1.9%, 2.2% or 2.5%;
the silica powder can reduce the phenomena of precipitation and delamination in the process of stirring the materials, and simultaneously enhances the compressive strength and the wear resistance of a condensate and increases the flame retardant property;
typical but not limiting mass percentages of dextrin micropowder are, for example: 0.5%, 0.7%, 1.0%, 1.2% or 1.5%;
the dextrin micropowder is white dextrin micropowder or yellow dextrin micropowder; the dextrin micro powder is easy to dissolve in water, has strong viscosity, has excellent effect on the initial setting of the furnace tube, is mixed and stirred uniformly according to a proper proportion, and has good effects on preventing collapse, keeping angle and keeping ridge in the molding.
The white corundum with various particle grades is adopted as a main raw material, and stirring and mixing are carried out, so that the particle accumulation degree of materials during mixing and shaping can be optimized; the silica powder can reduce the phenomena of precipitation and delamination in the process of stirring the materials, and simultaneously enhances the compressive strength and the wear resistance of a condensate and increases the flame retardant property; the corundum furnace tube has the effects of filling air holes and sealing air holes, and can improve the overall performance of the corundum furnace tube; the high-temperature calcined alumina powder has good high-temperature resistance, and can be used as a material for reinforcing and toughening in the sintering process, and improve compactness, smoothness, cold and hot fatigue property, fracture toughness and the like; the effect of filling air holes is achieved, and the high temperature resistance is over 1800 ℃; thereby improving the overall performance of the corundum furnace tube.
Step b, mixing materials: b, placing the ingredients in the step a into a stirrer, stirring and mixing for 64-96 minutes at the speed of 40-60 revolutions per minute, and uniformly mixing;
in step b of the present invention:
typical but non-limiting stirring speeds of the stirrer are for example: 40, 45, 50, 55 or 60 revolutions per minute; typical but non-limiting mixing times for a mixer are for example: 64 minutes, 72 minutes, 80 minutes, 88 minutes, or 96 minutes.
Step c, ageing: b, placing the uniformly mixed materials in the step b in a sealed space for ageing for 20-24 hours;
in step c of the present invention:
typical but non-limiting ageing times are for example: 20 hours, 21 hours, 22 hours, 23 hours, or 24 hours.
The material and the water are distributed more uniformly, the forming performance of the material can be improved, and the sintering quality is improved.
Step d, making and shaping: c, pouring the material subjected to ageing into an assembled mould, tamping and sealing the mould; then, uniformly knocking the outer side of the die to make and shape the material in the die;
through the forging and forming process, the appearance of the wet blank is more regular and delicate, and meanwhile, the elasticity of the wet blank can be improved.
Step e, drying: firstly, placing the molded die and the materials in a room temperature environment for 3-5 hours for primary drying; removing the mold, and drying the shaped wet blank in a closed space at 60-70 ℃ for 80-120 hours; obtaining a shaped dry blank;
in step e of the present invention:
typical but non-limiting preliminary drying times are for example: 3 hours, 3.5 hours, 4 hours, 4.5 hours, or 5 hours;
typical but non-limiting re-drying times are for example: 80 hours, 90 hours, 100 hours, 110 hours, or 120 hours; typical but non-limiting temperatures for re-drying are for example: 60 degrees celsius, 63 degrees celsius, 65 degrees celsius, 68 degrees celsius, or 70 degrees celsius.
Preferably, during the re-drying process, ventilation is performed once or twice every 5 hours.
The drying is divided into primary drying and secondary drying, and after the primary drying is finished, demolding and secondary drying treatment are carried out, so that the stability of the wet blank after shaping can be improved.
Step f, firing: e, placing the dry blank in the step e into a kiln, and then starting heating the kiln; the temperature rise process is as follows: raising the temperature within 100 ℃ per hour to 3-5 ℃, raising the temperature within 100 ℃ and 500 ℃ per hour to 5-10 ℃, raising the temperature above 500 ℃ per hour to 70-90 ℃ until the temperature in the kiln is raised to 1580 ℃ and 1750 ℃, and finishing the temperature raising process within 70-90 hours; after the temperature rise is finished, preserving the heat for 2.5 to 3.5 hours at the temperature of 1580-;
typical but non-limiting firing procedures are for example:
raising the temperature within 100 ℃ within 3-5 ℃ per hour, raising the temperature within 100 ℃ and 500 ℃ within 5-10 ℃ per hour, raising the temperature above 500 ℃ within 70-90 ℃ per hour until the temperature in the kiln is raised to 1580 ℃, and finishing the temperature raising process within 70 hours; preserving the heat for 3.5 hours at 1580 +/-20 ℃.
Heating to 3-5 ℃ per hour within 100 ℃, heating to 5-10 ℃ per hour at 500 ℃ and heating to 70-90 ℃ per hour above 500 ℃ until the temperature in the kiln is raised to 1620 ℃, wherein the heating process is completed within 75 hours; keeping the temperature for 3.2 hours in the range of 1620 ℃ plus or minus 20 ℃.
Raising the temperature within 100 ℃ within 3-5 ℃ per hour, raising the temperature within 100 ℃ and 500 ℃ within 5-10 ℃ per hour, raising the temperature above 500 ℃ within 70-90 ℃ per hour until the temperature in the kiln is raised to 1680 ℃, and finishing the temperature raising process within 80 hours; keeping the temperature within the range of 1680 +/-20 ℃ for 3 hours.
Heating to 3-5 ℃ per hour within 100 ℃, heating to 5-10 ℃ per hour at 500 ℃ and heating to 70-90 ℃ per hour above 500 ℃ until the temperature in the kiln is increased to 1720 ℃, wherein the heating process is completed within 85 hours; keeping the temperature within the range of 1720 +/-20 ℃ for 2.8 hours.
Raising the temperature within 100 ℃ by 3-5 ℃ per hour, raising the temperature within 100 ℃ and 500 ℃ by 5-10 ℃ per hour, raising the temperature above 500 ℃ by 70-90 ℃ per hour until the temperature in the kiln is raised to 1750 ℃, and finishing the temperature raising process within 90 hours; keeping the temperature for 2.5 hours within the range of 1750 +/-20 ℃.
In the early stage, the temperature is raised at a low temperature stage at a low temperature rate, so that the uniformity of the temperature of the dry blank can be improved, the phenomenon of chapping caused by uneven temperature in the early stage is avoided, and in the later stage after the moisture is basically dried, the temperature is raised to a large extent, so that the porosity can be reduced, the microcrystalline forming effect among materials is improved, and the sintering quality of the corundum furnace tube is improved.
Step g, cooling: and after firing is finished, stopping heating the kiln, reducing the temperature in the kiln to 80-120 ℃, opening the kiln, and taking out the fired furnace tube.
The method solves the problems of porosity increase and service life reduction caused by adopting a gypsum mould to carry out slurry pouring to prepare the corundum furnace tube.
Preferably, in the step b, powder with the particle size of less than or equal to 200 meshes in the ingredients is placed in a stirrer to be stirred and mixed for 16-24 minutes at the speed of 40-60 revolutions per minute, and then other granular materials are completely added in the stirrer to be stirred and mixed for 16-24 minutes at the same speed; and (3) adding 5-7% of water into the stirrer according to the mass percentage, continuously stirring and mixing for 32-48 minutes at the same speed, and uniformly mixing.
One way of doing this is: the powder with the granularity of less than or equal to 200 meshes in the ingredients is firstly placed in a stirrer to be stirred and mixed for 16 minutes at the speed of 40-60 revolutions per minute, then other particles are completely added in the stirrer to be stirred and mixed for 16 minutes at the same speed, then 5 percent of water is put in the stirrer to be continuously stirred and mixed for 48 minutes at the same speed, and the mixture is uniformly mixed.
Another way of realisation is: the powder with the granularity of less than or equal to 200 meshes in the ingredients is firstly placed in a stirrer to be stirred and mixed for 24 minutes at the speed of 40-60 revolutions per minute, then other particles are completely added in the stirrer to be stirred and mixed for 24 minutes at the same speed, then 7 percent of water is put in the stirrer to be continuously stirred and mixed for 32 minutes at the same speed, and the mixture is uniformly mixed.
The powder with smaller granularity is mixed firstly, and then the material with larger granularity is mixed, which is equivalent to reducing the mixing time of the powder, and can reduce the phenomena of sedimentation and delamination generated in the stirring process of the powder and the particle materials.
Preferably, in the step c, the uniformly mixed material in the step b is placed in a plastic woven bag for sealing, and then ageing for 20-24 hours. Arrange the material in the plastic woven bag and seal up the predicament material, can place the braided bag stack on the one hand, save space, on the other hand, after the predicament material of being convenient for, directly pour the material into mould, convenient and fast through the braided bag.
Preferably, in the step d, when the material trapped in the step c is poured into the mold, the material is poured in a plurality of times, and after 15% -25% of the volume of the mold is poured each time, the material is tamped once until the mold is filled with the material, and then the mold is sealed. Through making the design, can promote the effect of piling up of material in the mould, form better design effect.
One embodiment is: pouring materials with the volume of 15% of that of the mold each time, namely manually tamping, then pouring materials with the volume of 25% again, tamping, then pouring materials with the volume of 20% three times again, tamping, and sealing; and horizontally arranging the filled moulds into a row, standing two male workers at two sides respectively, alternately knocking each position outside the moulds with uniform force, wherein the knocking times of each mould are 1500 times or 1600 times or 1700 times or 1800 times in total, and adjusting the corresponding knocking times according to the physical conditions and the force conditions of the workers responsible for knocking. In consideration of the fatigue feeling of the manual labor, the beating personnel can be replaced when the beating is continuously carried out. The shaping effect of the wet blank can be improved by manually beating for many times.
The other implementation mode is as follows: after materials with the capacity of 20% of the mold are poured each time, the materials are manually tamped, then the materials are continuously filled until the materials are filled to the full position, after sealing is carried out, the mold is transversely placed in a hammering area of an electric continuous hammering machine, the hammering machine is started, the rotating speed of a pendulum bob of the hammering machine is set to be 2-5 revolutions per minute, the filled mold is hammered, an operator moves the transversely moving mold every 3-5 minutes, the hammering machine basically can hammer all positions of the mold, 3-6 times of integral hammering is carried out back and forth according to the transverse moving direction of the mold, and the effect is better; the total beating time is 60-90 minutes. The electric continuous beating machine can continuously beat, so that the labor intensity can be reduced, and the forming stability of a wet blank can be improved.
Preferably, in the step g, after the kiln stops heating, opening a kiln ventilation channel, naturally cooling for 80 hours, opening the kiln when the temperature in the kiln is reduced to 120 ℃, and taking out the corundum furnace tube to finish the preparation work.
Preferably, in the step g, after the kiln stops heating, opening a kiln ventilation channel, naturally cooling for 100 hours, and opening the kiln when the temperature in the kiln is reduced to 100 ℃, taking out the corundum furnace tube, thereby completing the preparation work.
Preferably, in the step g, after the kiln stops heating, opening a kiln ventilation channel, naturally cooling for 120 hours, opening the kiln when the temperature in the kiln is reduced to 80 ℃, and taking out the corundum furnace tube to finish the preparation work.
And natural cooling is adopted, so that the temperature shock of the corundum furnace tube body in the cooling process can be reduced, but the period is longer.
Preferably, in the step g, after the kiln stops heating, opening a kiln ventilation channel, performing auxiliary cooling on the extension machine for 35 hours, and when the temperature in the kiln is reduced to 120 ℃, opening the kiln, taking out the corundum furnace tube, and finishing the preparation work.
Preferably, in the step g, after the kiln stops heating, opening a kiln ventilation channel, performing auxiliary cooling on the extension machine for 50 hours, opening the kiln when the temperature in the kiln is reduced to 80 ℃, and taking out the corundum furnace tube to finish the preparation work.
When the blower is adopted for auxiliary cooling, the blower works with low power in a high-temperature stage, the temperature change rate in the high-temperature stage (1700 + 1000 ℃), and the working power of the blower is increased in a low-temperature stage (below 1000 ℃) so as to reduce the temperature shock and influence the use effect of the corundum furnace tube.
Meanwhile, by using the processing method provided by the invention, the cost of the die is reduced, the quality density of the product is improved, the heat conductivity is stable, and the heat conduction time is reduced; under the same condition, the service life of the corundum furnace tube is prolonged by 2.5-4 months; the porosity is 13-20%, and the volume density is 2.8-3.3 g/cm 3; the thermal vibration stability (1100 ℃ water cooling) is 15 times, and the compressive strength after 15 times of thermal vibration is 90-120 Mpa.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. The preparation method of the corundum furnace tube is characterized by comprising the following steps: the preparation method sequentially comprises the following preparation steps:
step a, batching: according to the mass percentage: selecting 6-10% of white jade diamonds with the particle size of 8 meshes, 12-16% of white jade diamonds with the particle size of 12 meshes, 8-10% of white jade diamonds with the particle size of 24 meshes, 7-10% of white jade diamonds with the particle size of 40 meshes, 8-11% of white jade diamonds with the particle size of 80 meshes, 8-11% of white jade diamonds with the particle size of 120 meshes, 8-10% of white jade diamonds with the particle size of 180 meshes, 8-10% of white jade diamonds with the particle size of 200 meshes, 15-20% of white jade diamonds with the particle size of 325 meshes, 8-10% of high-temperature calcined alumina powder with the particle size of 325 meshes and 0.5-1;
step b, mixing materials: b, placing the ingredients in the step a into a stirrer, stirring and mixing for 64-96 minutes at the speed of 40-60 revolutions per minute, and uniformly mixing;
step c, ageing: b, placing the uniformly mixed materials in the step b in a sealed space for ageing for 20-24 hours;
step d, making and shaping: c, pouring the material subjected to ageing into an assembled mould, tamping and sealing the mould; then, uniformly knocking the outer side of the die to make and shape the material in the die;
step e, drying: firstly, placing the molded die and the materials for 3-5 hours for preliminary drying; removing the mold, and drying the shaped wet blank in a closed space at 60-70 ℃ for 80-120 hours; obtaining a shaped dry blank;
step f, firing: e, placing the dry blank in the step e into a kiln, and then starting heating the kiln; the temperature rise process is as follows: raising the temperature within 100 ℃ per hour to 3-5 ℃, raising the temperature within 100 ℃ and 500 ℃ per hour to 5-10 ℃, raising the temperature above 500 ℃ per hour to 70-90 ℃ until the temperature in the kiln is raised to 1580 ℃ and 1750 ℃, and finishing the temperature raising process within 70-90 hours; after the temperature rise is finished, preserving the heat for 2.5 to 3.5 hours at the temperature of 1580-;
step g, cooling: and after firing is finished, stopping heating the kiln, reducing the temperature in the kiln to 80-120 ℃, opening the kiln, and taking out the fired furnace tube.
2. The corundum furnace tube preparation method according to claim 1, characterized in that: in the step b, powder with the granularity of less than or equal to 200 meshes in the ingredients is placed in a stirrer to be stirred and mixed for 16-24 minutes at the speed of 40-60 revolutions per minute, and then other granular materials are all added in the stirrer to be stirred and mixed for 16-24 minutes at the same speed; and (3) adding 5-7% of water into the stirrer according to the mass percentage, continuously stirring and mixing for 32-48 minutes at the same speed, and uniformly mixing.
3. The corundum furnace tube preparation method according to claim 1, characterized in that: in the step c, the materials uniformly mixed in the step b are placed in a plastic woven bag for sealing, and then ageing for 20-24 hours.
4. The corundum furnace tube preparation method according to claim 1, characterized in that: and d, pouring the material trapped in the step c into a mold in several times, tamping once after pouring 15% -25% of the volume of the mold each time, and sealing the mold until the mold is filled with the material.
5. The corundum furnace tube preparation method according to claim 1, characterized in that: in the step d, when the outside of the loaded mold is uniformly knocked, the mold is manually knocked for 1800 times by manpower.
6. The corundum furnace tube preparation method according to claim 1, characterized in that: and g, naturally cooling for 80-100 hours or cooling for 35-50 hours by using a fan for assistance in a cooling mode.
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