CN111196736A - Box-type resistance furnace complex-phase gradient furnace body brick and complex-phase gradient furnace body - Google Patents

Box-type resistance furnace complex-phase gradient furnace body brick and complex-phase gradient furnace body Download PDF

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Publication number
CN111196736A
CN111196736A CN202010092283.2A CN202010092283A CN111196736A CN 111196736 A CN111196736 A CN 111196736A CN 202010092283 A CN202010092283 A CN 202010092283A CN 111196736 A CN111196736 A CN 111196736A
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furnace body
phase gradient
brick
complex
gradient furnace
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罗旭东
李季佳
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University of Science and Technology Liaoning USTL
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University of Science and Technology Liaoning USTL
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C04B38/063Preparing or treating the raw materials individually or as batches
    • C04B38/0635Compounding ingredients
    • C04B38/0645Burnable, meltable, sublimable materials
    • C04B38/0675Vegetable refuse; Cellulosic materials, e.g. wood chips, cork, peat, paper
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/14Shaped 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 silica
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66Monolithic refractories or refractory mortars, including those whether or not containing clay
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00Casings; Linings; Walls; Roofs
    • F27D1/04Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74Physical characteristics
    • C04B2235/77Density
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607Thermal properties, e.g. thermal expansion coefficient

Abstract

The invention relates to a box-type resistance furnace complex phase gradient furnace body brick and a complex phase gradient furnace body, comprising the following steps: the box-type resistance furnace complex-phase gradient furnace body brick is prepared by premixing, mixing, molding, drying and sintering high-alumina bauxite, silica fume, alumina powder, pore-forming agent, high-quality diatomite, wood dust and high-temperature binder serving as raw materials. The complex phase gradient furnace body brick is a double-layer brick, the inner layer is a light high-alumina brick, the outer layer is a diatomite light brick, the heat insulation effect of the inner layer brick is good, although the inner layer brick cannot be directly used as a working surface, the joint surface is not cracked under high temperature, the crack expansion of the high-alumina brick is effectively prevented, the high-temperature mechanical property of the complex phase gradient furnace body brick is improved, the cost is reduced, and meanwhile, the problems that the assembly of the traditional furnace body brick is complicated by using the furnace body brick and the like are solved.

Description

Box-type resistance furnace complex-phase gradient furnace body brick and complex-phase gradient furnace body
Technical Field
The invention relates to the field of kiln design, in particular to a box-type resistance furnace complex-phase gradient furnace body brick and a complex-phase gradient furnace body.
Background
Along with the rapid development of high-temperature industry, the performance requirements of refractory materialsThe gradual rise of the prior art, the conventional high-alumina brick can not meet the industrial requirements, and the crack propagation caused by the inherent structural defects in the use process of the high-alumina brick is still a great problem for hindering the development of the high-alumina brick. The alumina content of the light high-alumina brick is more than 48 percent, the light refractory material mainly comprises mullite and glass phase or corundum, and the volume density is 0.4-1.35 g/cm3. Porosity is 66-73%, and compressive strength is 1-8 MPa. The thermal shock resistance is good, and the thermal shock resistant alloy has wide application in high-temperature industries such as metallurgy, building materials, chemical engineering and the like.
How to solve the problems of structural defects, inherent air holes and cracks of the high-alumina brick; under the action of external force, the crack is easy to start, and the crack is easy to generate brittle fracture due to the lack of an energy consumption mechanism; therefore, the patent provides a box-type resistance furnace complex-phase gradient furnace body brick, which reduces the cost and satisfies the full utilization of resources while overcoming the structural defects of high-alumina bricks.
Disclosure of Invention
In order to solve the defects and shortcomings of the prior art, the invention provides a box type resistance furnace complex phase gradient furnace body brick and a complex phase gradient furnace body.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the technical scheme is as follows: the box-type resistance furnace complex-phase gradient furnace body brick is characterized in that high-alumina bauxite, silica fume, alumina powder, pore-forming agent, high-quality diatomite, wood dust and high-temperature binder are used as raw materials, and the box-type resistance furnace complex-phase gradient furnace body brick is prepared through premixing, mixing, molding, drying and sintering, and the process steps are as follows:
firstly, premixing 60-80% of high-alumina bauxite, 1-10% of silica fume, 1-10% of alumina powder and 1-10% of pore-forming agent in a stirrer for 5-10 min to obtain a premixed material I; premixing 60-80% of high-quality diatomite, 10-20% of sawdust and 1-10% of high-temperature binder in a stirrer for 5-10 min to obtain a premixed material II;
step two, mixing the premixed material I with water accounting for 1-10% of the mass of the premixed material I, and continuously stirring for 10-30 min to obtain a castable I; mixing the premixed material II with water accounting for 1-10% of the mass of the premixed material II, and continuously stirring for 10-30 min to obtain a castable II;
pouring the first castable into 1/3-1/2 of the volume of the mold, pouring the second castable into the whole mold, curing for 24-48 hours, and then demolding to obtain a complex-phase gradient furnace body brick blank;
drying the complex phase gradient furnace body brick blank at 100-150 ℃ for 24-48 hours to obtain a dried complex phase gradient furnace body brick blank;
and fifthly, firing the dried green bricks of the complex phase gradient furnace body at high temperature, naturally cooling the green bricks along with the furnace, and taking out the green bricks to obtain the complex phase gradient furnace body bricks.
And the high-temperature firing system in the fifth step is to keep the temperature at 800-1100 ℃ for 1-3 hours, continue to heat to 1350-1500 ℃ and keep the temperature for 1-3 hours.
In the first step, the granularity of the medium-high bauxite and the high-quality diatomite is 5-3 mm, the granularity of the silica fume and the wood dust is 3-1 mm, the granularity of the alumina powder is 1-0 mm, and the granularity of the pore-forming agent and the high-temperature binder is 200 meshes;
the high-alumina bauxite is diaspore and kaolinite (2 SiO)2·Al2O3·2H2O), the aluminum content is more than 40%, and the ratio of aluminum to silicon is more than 2.5(A/S is more than or equal to 2.5);
the silicon ash contains 80-92% of silicon;
al in the alumina powder2O3≥99.5%;
The chemical component of the diatomite in the high-quality diatomite is mainly SiO2Containing a small amount of Al2O3、Fe2O3、CaO、MgO;
The pore-forming agent is any one of walnut kernel powder and straw fine powder;
the high-temperature binder is any one of polytetrafluoroethylene and aluminum dihydrogen phosphate.
The second technical proposal is that: a box-type resistance furnace complex phase gradient furnace body is characterized in that a plurality of box-type resistance furnace complex phase gradient furnace body bricks are connected by mortise and tenon structures, and asbestos is filled between the furnace body bricks and an outermost layer of an iron sheet of the furnace body, so that the complex phase gradient furnace body is formed.
The invention utilizes the irregular shape of the bauxite and the high-quality diatomite particles to facilitate the interpenetration, occlusion and pinning among the particles, can improve the bonding strength, forms the framework of the material after the refractory aggregate is fired, and can improve the thermal vibration stability and the strength of the material. The high-alumina bauxite fine powder and the high-quality diatomite fine powder have certain fluidity, can fill gaps of materials, improve the volume density of the materials and improve the construction performance, meanwhile, the activity of the fine powder is stronger than that of aggregate particles, the fine powder can preferentially react with additives in the materials, the strength of the materials is improved or other properties of the materials are improved, the silica fume increases the overall fluidity of the castable, and the alumina powder promotes the hydration of high-alumina cement to accelerate the attenuation of the fluidity of the castable. The pore-forming agent such as wood dust and the like leaves holes after high-temperature calcination, so that the product is fluffy and breathable, and the high-temperature strength of the product is enhanced by the high-temperature binder.
Compared with the prior art, the invention has the beneficial effects that: the invention takes high-alumina bauxite, silica fume, alumina powder, pore-forming agent, high-quality diatomite, wood dust and high-temperature binder as raw materials, and obtains the box-type resistance furnace complex-phase gradient furnace body brick through the procedures of premixing, mixing, molding, drying and sintering; the complex phase gradient furnace body brick is a double-layer brick, the inner layer is a light high-alumina brick, the outer layer is a diatomite light brick, the heat insulation effect of the inner layer brick is good, although the inner layer brick cannot be directly used as a working surface, the joint surface is not cracked under high temperature, the crack expansion of the high-alumina brick is effectively prevented, and the high-temperature mechanical property of the complex phase gradient furnace body brick is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a complex phase gradient furnace body brick of a box-type resistance furnace.
In the figure: 1-light high-alumina brick layer and 2-diatomite light brick layer.
Detailed Description
The invention is further illustrated by the following examples:
example 1:
premixing 76kg of high-alumina bauxite, 8kg of silica fume, 6kg of alumina powder and 10kg of walnut kernel powder in a stirrer for 10min to obtain a premixed material I; premixing 80kg of high-quality diatomite, 15kg of sawdust and 5kg of aluminum dihydrogen phosphate in a stirrer for 10min to obtain a premixed material II; mixing the premixed material I with 5kg of water, and continuously stirring for 30min to obtain a castable I; mixing the premixed material II with 5kg of water, and continuously stirring for 30min to obtain a castable II; pouring the first castable into 1/2 of the volume of the mold, then pouring the second castable into the whole mold, curing for 24 hours, and then demolding to obtain a complex phase gradient furnace body brick blank body consisting of a light high-alumina brick layer and a diatomite light brick layer; drying the complex phase gradient furnace body brick blank body for 24 hours at 110 ℃ to obtain a dried complex phase gradient furnace body brick blank body; and (3) preserving the heat of the dried complex phase gradient furnace body brick blank for 1 hour at 1000 ℃, continuously heating to 1500 ℃, preserving the heat for 3 hours, naturally cooling along with the furnace, and taking out to obtain the complex phase gradient furnace body brick.
The normal temperature compressive strength of the sample is measured according to GB/T3997.2-1998; measuring the volume density of the sample according to GB/T2997-2000; the thermal conductivity of the samples was measured according to GB/T17106-. The box-type resistance furnace complex-phase gradient furnace body brick prepared by the embodiment has the normal-temperature compressive strength of 4.5Mpa and the volume density of 0.83g/cm3The thermal conductivity (300. + -. 10 ℃ C.) was 0.36 M.K.
Example 2:
premixing 76kg of high-alumina bauxite, 6kg of silica fume, 8kg of alumina powder and 10kg of walnut kernel powder in a stirrer for 10min to obtain a premixed material I; premixing 75kg of high-quality diatomite, 18kg of sawdust and 7kg of aluminum dihydrogen phosphate in a stirrer for 10min to obtain a premixed material II; mixing the premixed material I with 5kg of water, and continuously stirring for 30min to obtain a castable I; mixing the premixed material II with 5kg of water, and continuously stirring for 30min to obtain a castable II; pouring the first castable into 1/2 of the volume of the mold, then pouring the second castable into the whole mold, curing for 24 hours, and then demolding to obtain a complex phase gradient furnace body brick blank body consisting of a light high-alumina brick layer and a diatomite light brick layer; drying the complex phase gradient furnace body brick blank body for 24 hours at 110 ℃ to obtain a dried complex phase gradient furnace body brick blank body; and (3) preserving the heat of the dried complex phase gradient furnace body brick blank for 1 hour at 1000 ℃, continuously heating to 1500 ℃, preserving the heat for 3 hours, naturally cooling along with the furnace, and taking out to obtain the complex phase gradient furnace body brick.
The normal temperature compressive strength of the sample is measured according to GB/T3997.2-1998; measuring the volume density of the sample according to GB/T2997-2000; the thermal conductivity of the samples was measured according to GB/T17106-. The box-type resistance furnace complex-phase gradient furnace body brick prepared by the embodiment has the normal-temperature compressive strength of 4.2Mpa and the volume density of 0.79g/cm3The thermal conductivity (300. + -. 10 ℃ C.) was 0.42 M.K.
Example 3:
premixing 70kg of high-alumina bauxite, 10kg of silica fume, 10kg of alumina powder and 10kg of walnut kernel powder in a stirrer for 10min to obtain a premixed material I; premixing 70kg of high-quality diatomite, 20kg of sawdust and 10kg of aluminum dihydrogen phosphate in a stirrer for 10min to obtain a premixed material II; mixing the premixed material I with 5kg of water, and continuously stirring for 30min to obtain a castable I; mixing the premixed material II with 5kg of water, and continuously stirring for 30min to obtain a castable II; pouring the first castable into 1/2 of the volume of the mold, then pouring the second castable into the whole mold, curing for 24 hours, and then demolding to obtain a complex phase gradient furnace body brick blank body consisting of a light high-alumina brick layer and a diatomite light brick layer; drying the complex phase gradient furnace body brick blank body for 24 hours at 110 ℃ to obtain a dried complex phase gradient furnace body brick blank body; and (3) preserving the heat of the dried complex phase gradient furnace body brick blank for 1 hour at 1000 ℃, continuously heating to 1500 ℃, preserving the heat for 3 hours, naturally cooling along with the furnace, and taking out to obtain the complex phase gradient furnace body brick.
The normal temperature compressive strength of the sample is measured according to GB/T3997.2-1998; measuring the volume density of the sample according to GB/T2997-2000; the thermal conductivity of the samples was measured according to GB/T17106-. The box-type resistance furnace complex-phase gradient furnace body brick prepared by the embodiment has the normal-temperature compressive strength of 3.2Mpa and the volume density of 0.71g/cm3The thermal conductivity (300. + -. 10 ℃ C.) was 0.36 M.K.
A plurality of complex phase gradient furnace body bricks manufactured by the above embodiments are connected in a mortise and tenon structure, and asbestos is filled between the furnace body bricks and the iron sheet at the outermost layer of the furnace body, so that the complex phase gradient furnace body is formed. The complex phase gradient furnace body brick is a double-layer brick, the inner layer is a light high-alumina brick, the outer layer is a diatomite light brick, the heat insulation effect of the inner layer brick is good, although the inner layer brick can not be directly used as a working surface, the joint surface is difficult to crack under high temperature, so that the crack expansion of the high-alumina brick can be effectively prevented, and the high-temperature mechanical property of the complex phase gradient furnace body brick is improved.
The following is a comparative example of two single component furnace bricks of similar composition.
Comparative example 1:
premixing 152kg of high-alumina, 16kg of silica fume, 12kg of alumina powder and 20kg of walnut kernel powder in a stirrer for 10min to obtain premixed materials; mixing the premixed material with 10kg of water, and continuously stirring for 30min to obtain a castable; pouring the casting material into the whole mould, curing for 24 hours, and then demoulding to obtain a furnace body brick blank; drying the furnace body brick blank at 110 ℃ for 24 hours to obtain a dried furnace body brick blank; and (3) preserving the heat of the dried furnace body brick blank for 1 hour at 1000 ℃, continuously heating to 1500 ℃, preserving the heat for 3 hours, naturally cooling along with the furnace, and taking out to obtain the furnace body brick.
The normal temperature compressive strength of the sample is measured according to GB/T3997.2-1998; measuring the volume density of the sample according to GB/T2997-2000; the thermal conductivity of the samples was measured according to GB/T17106-. The furnace body brick prepared by the comparative example has the normal temperature compressive strength of 4.6Mpa and the volume density of 1.71g/cm3The thermal conductivity (300. + -. 10 ℃ C.) was 0.26 M.K.
Comparative example 2:
premixing 160kg of high-quality diatomite, 30kg of sawdust and 10kg of aluminum dihydrogen phosphate in a stirrer for 10min to obtain a premixed material; mixing the premixed material with 10kg of water, and continuously stirring for 30min to obtain a castable; pouring the casting material into the whole mould, curing for 24 hours, and then demoulding to obtain a furnace body brick blank; drying the furnace body brick blank at 110 ℃ for 24 hours to obtain a dried furnace body brick blank; and (3) preserving the heat of the dried furnace body brick blank for 1 hour at 1000 ℃, continuously heating to 1500 ℃, preserving the heat for 3 hours, naturally cooling along with the furnace, and taking out to obtain the furnace body brick.
The normal temperature compressive strength of the sample is measured according to GB/T3997.2-1998; measuring the volume density of the sample according to GB/T2997-2000; according to GB/T17106-And measuring the heat conductivity coefficient of the sample. The furnace body brick prepared by the comparative example has the normal temperature compressive strength of 4.5Mpa and the volume density of 1.62g/cm3The thermal conductivity (300. + -. 10 ℃ C.) was 0.15 M.K.
The embodiments show that the box-type resistance furnace complex-phase gradient furnace door brick prepared by the invention has good toughness under the combined action of various raw materials, can bear large external force, is not easy to crack when being collided, and has good heat preservation effect; meanwhile, the comparison between the embodiment 1 and the comparison examples 1 and 2 shows that all indexes of the complex phase gradient furnace door brick of the resistance furnace are higher than those of the furnace door brick with a single formula, and the application range of the refractory material is greatly improved by using the complex phase gradient furnace door brick of the box-type resistance furnace prepared by the invention, thereby being beneficial to the popularization of the refractory material.

Claims (4)

1. The box-type resistance furnace complex-phase gradient furnace body brick is characterized in that high-alumina bauxite, silica fume, alumina powder, pore-forming agent, high-quality diatomite, wood dust and high-temperature binder are used as raw materials, and the box-type resistance furnace complex-phase gradient furnace body brick is prepared through premixing, mixing, molding, drying and sintering, and the process steps are as follows:
firstly, premixing 60-80% of high-alumina bauxite, 1-10% of silica fume, 1-10% of alumina powder and 1-10% of pore-forming agent in a stirrer for 5-10 min to obtain a premixed material I; premixing 60-80% of high-quality diatomite, 10-20% of sawdust and 1-10% of high-temperature binder in a stirrer for 5-10 min to obtain a premixed material II;
step two, mixing the premixed material I with water accounting for 1-10% of the mass of the premixed material I, and continuously stirring for 10-30 min to obtain a castable I; mixing the premixed material II with water accounting for 1-10% of the mass of the premixed material II, and continuously stirring for 10-30 min to obtain a castable II;
pouring the first castable into 1/3-1/2 of the volume of the mold, pouring the second castable into the whole mold, curing for 24-48 hours, and then demolding to obtain a complex-phase gradient furnace body brick blank;
drying the complex phase gradient furnace body brick blank at 100-150 ℃ for 24-48 hours to obtain a dried complex phase gradient furnace body brick blank;
and fifthly, firing the dried green bricks of the complex phase gradient furnace body at high temperature, naturally cooling the green bricks along with the furnace, and taking out the green bricks to obtain the complex phase gradient furnace body bricks.
2. The box-type resistance furnace complex phase gradient furnace body brick as claimed in claim 1, wherein the high temperature firing system in the fifth step is to keep the temperature at 800-1100 ℃ for 1-3 hours, continue to heat to 1350-1500 ℃ and keep the temperature for 1-3 hours.
3. The box-type resistance furnace complex phase gradient furnace body brick as claimed in claim 1, wherein in the first step, the particle size of the medium-high bauxite and the high-quality diatomite is 5-3 mm, the particle size of the silica fume and the wood dust is 3-1 mm, the particle size of the alumina powder is 1-0 mm, and the particle size of the pore-forming agent and the high-temperature binder is 200 meshes;
the high-alumina bauxite is diaspore and kaolinite (2 SiO)2·Al2O3·2H2O), the aluminum content is more than 40%, and the ratio of aluminum to silicon is more than 2.5(A/S is more than or equal to 2.5);
the silicon ash contains 80-92% of silicon;
al in the alumina powder2O3≥99.5%;
The chemical component of the diatomite in the high-quality diatomite is mainly SiO2Containing a small amount of Al2O3、Fe2O3、CaO、MgO;
The pore-forming agent is any one of walnut kernel powder and straw fine powder;
the high-temperature binder is any one of polytetrafluoroethylene and aluminum dihydrogen phosphate.
4. A box-type resistance furnace complex phase gradient furnace body is characterized in that a plurality of box-type resistance furnace complex phase gradient furnace body bricks according to any one of claims 1 to 3 are connected by mortise and tenon structures, and asbestos is filled between the furnace body bricks and an outermost layer of an iron sheet of the furnace body, so that the complex phase gradient furnace body is formed.
CN202010092283.2A 2020-02-14 2020-02-14 Box-type resistance furnace complex-phase gradient furnace body brick and complex-phase gradient furnace body Pending CN111196736A (en)

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