CN112344746A - Sandwich type coke oven door prefabricated part and preparation method thereof - Google Patents

Sandwich type coke oven door prefabricated part and preparation method thereof Download PDF

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Publication number
CN112344746A
CN112344746A CN202011323260.4A CN202011323260A CN112344746A CN 112344746 A CN112344746 A CN 112344746A CN 202011323260 A CN202011323260 A CN 202011323260A CN 112344746 A CN112344746 A CN 112344746A
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China
Prior art keywords
oven door
coke oven
powder
lining
sandwich
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Pending
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CN202011323260.4A
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Chinese (zh)
Inventor
刘贯重
王司言
陈建军
郭天锴
霍利强
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Beijing Allied Rongda Engineering Material Co ltd
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Beijing Allied Rongda Engineering Material Co ltd
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Priority to CN202011323260.4A priority Critical patent/CN112344746A/en
Publication of CN112344746A publication Critical patent/CN112344746A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/02—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material with fibres or particles being present as additives in the layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
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    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
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    • C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous materials
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coke Industry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

The invention provides a sandwich type coke oven door prefabricated part and a preparation method thereof. The invention provides a sandwich type coke oven door prefabricated part, which solves the problem that various existing coke oven door lining bricks are lost, can effectively avoid the heat-insulating lining from being damaged in the transportation and installation process, reduces the weight of the coke oven door prefabricated part and the whole oven door, improves the heat-insulating property of the coke oven door, reduces the heat loss in a carbonization chamber, improves the maturity of a coke head by improving the temperature at two sides of a machine coke, shortens the coking time, saves energy, improves the coke quality at the same time, is firmly combined with an oven door shell, and has longer service life.

Description

Sandwich type coke oven door prefabricated part and preparation method thereof
Technical Field
The invention relates to the technical field of refractory materials, in particular to a sandwich type coke oven door prefabricated part and a preparation method thereof.
Background
The coke oven is a coking basic kiln and provides important coke and coal gas for the metallurgical industry, and the working temperature is 900-. The coke oven door refers to coke oven auxiliary equipment for opening and closing oven ports at two ends of a coke oven carbonization chamber, when the oven door is closed, the carbonization chamber is isolated from the atmosphere, and when the oven door is opened, a coke pushing rod can push out coke. In order to protect the oven door and reduce the heat loss of the carbonization chamber, the side of the oven door of the coke oven facing the carbonization chamber is built with refractory lining bricks or lining bricks which are embedded on an oven door frame shell, and heat insulation materials are filled between the lining bricks and the shell.
Because the lining brick of the coke oven door is positioned in the carbonization chamber and bears the thermal shock of frequent opening and closing of the oven door, the friction of red hot coke, the erosion of ash content, moisture content, acid and reducing atmosphere and the damage of carbon deposition for a long time, the service life of the lining brick of the coke oven door is shorter, the service life of the traditional clay lining brick is only 1 to 2 years, and the service life of the later developed lining bricks of cordierite, fused quartz and the like is improved to a certain extent. However, the problem of energy conservation and heat preservation of the coke oven door becomes more prominent while the service life of the coke oven door is greatly prolonged due to the improvement of the material of the lining brick of the coke oven door. Namely, the heavy refractory material can strengthen the lining brick strength and prolong the service life, but the heat conductivity coefficient is high, so that the heat insulating property of the furnace door is poor, the energy-saving effect is influenced, the temperature of the two sides of machine coke is reduced, the coke head maturity is low, the coking time is long, the coke quality is influenced, the quality of the lining brick of the furnace door is greatly improved, and the installation and transportation difficulty is increased; the light material has the advantages of environmental protection and energy conservation, but has low strength, short service life because of easy damage in the transportation, installation and use processes, large porosity, and easy penetration of coke and coking products thereof into lining bricks to corrode the lining bricks. Namely, the problems of prolonging the service life, saving energy, preserving heat, being convenient for installation and transportation and the like are difficult to reconcile and consider, and the lining bricks of the coke oven door provided in the prior art are always different from each other.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a sandwich type coke oven door prefabricated part and a preparation method thereof.
The invention adopts the following technical scheme:
the invention provides a sandwich type coke oven door prefabricated part which comprises a heat insulation lining and a working outer lining, wherein the working outer lining wraps the heat insulation lining to form a sandwich structure.
In the prior art, a groove is generally arranged on one side of a lining brick close to an oven door shell to be filled with heat-insulating materials to play a role in heat preservation and heat insulation, namely, one side of each heat-insulating material is directly contacted with the oven door shell and is exposed before installation. Moreover, lining bricks comprising the heat-insulating materials are often fixed on the shell of the furnace door through bolts, but the heat-insulating materials are silicic acid fiber products which have almost no strength, cannot form a whole body and an effective support with a working layer, the thickness of the attachment inlay is limited (generally not more than 50mm), if the thickness is slightly thicker, the integral structural strength of the prefabricated block is affected, the long-term frequent switching of the furnace door cannot be resisted, and the service life is affected.
The invention researches and discovers that a sandwich type coke oven door prefabricated member is formed in a mode that a working outer lining wraps a heat insulation inner lining, the heat insulation inner lining and a working layer lining form an effective integral structure, the heat insulation inner lining can be effectively prevented from being damaged in the transportation and installation processes, the prefabricated member basically acts on the working outer lining with higher strength when being fixed on an oven door shell, the combination is firm, and the purposes of effectively reducing weight, saving energy, preserving heat, prolonging service life and facilitating installation are realized.
Further, the volume ratio of the heat-insulating lining to the coke oven door prefabricated member is 1/4-1/3.
The volume ratio of the heat-insulating lining to the coke oven door prefabricated part is controlled within the range, so that the weight of the coke oven door prefabricated part can be better reduced, the heat-insulating property of the coke oven door is improved, and the strength of the coke oven door prefabricated part is ensured.
Preferably, the shape and size of the insulating lining are set according to the shape and bolt hole arrangement of the coke oven door prefabricated member. Further preferably, the surface of the heat-insulating lining is only required to be spaced from a working surface parallel to the mounting surface by 150mm, spaced from the four side surfaces by 80mm, spaced from the mounting surface by 20mm and spaced from the hole wall of the bolt by 30 mm. According to the setting conditions, the weight of the coke oven door prefabricated member can be reduced to the maximum extent under the condition of ensuring the installation.
Furthermore, the heat-insulating lining is prepared in advance, and the working outer lining is cast and molded on the periphery of the heat-insulating lining.
The mode that the heat preservation lining combines with the work outer lining through the pouring is more convenient than the mode of aggregate erection, and combines more firmly moreover, is favorable to the extension of coke oven furnace gate prefab life-span.
Preferably, the raw material of the heat-insulating lining comprises 45-65 wt% of mullite, and the raw material of the working outer lining comprises 25-55 wt% of cordierite and 15-22 wt% of mullite.
The heat-insulating inner liner and the working outer liner are made of the materials respectively, so that the heat-insulating inner liner and the working outer liner can play respective corresponding roles (namely the heat-insulating inner liner plays a role in heat insulation and protection of the furnace door), and can be combined more tightly after being poured to form an effective whole, and the phenomenon that the gap between the heat-insulating inner liner and the working outer liner is large to cause instability in the process of opening and closing the furnace door can be avoided.
Preferably, the raw materials of the heat-insulating lining comprise the following components in percentage by mass: 35-50% of light mullite, 10-18% of floating bead, 4-8% of Guangxi mud, 10-15% of mullite powder, 3-6% of quartz powder, 12-18% of high alumina cement and 0.15-0.3% of sodium tripolyphosphate.
Further preferably, the light mullite is composed of two grades of 8-3mm and 3-0.074mm according to the mass ratio (1-2):1 as an aggregate, and the mesh number of the mullite powder is 200-250 meshes.
Preferably, the raw materials of the working outer lining comprise the following components in percentage by mass: 15-35% of flint clay, 20-40% of cordierite, 5-15% of cordierite powder, 15-22% of mullite powder, 3-6% of kyanite powder, 5-10% of silica fume and alumina composite superfine powder, 4-10% of pure calcium aluminate cement and 0.1-0.3% of water reducing agent.
The working outer lining prepared from the raw materials has the characteristics of moderate air holes, high strength, good thermal shock resistance and the like, has long service life, and can well protect the furnace door and the internal heat-insulating lining.
Further preferably, the particle size of the flint clay is 8-3mm, the particle size of the cordierite is 3-0.074mm, and the mesh numbers of the cordierite powder and the mullite powder are both 200-250 meshes.
Further, the working surface of the working outer lining is coated with glaze.
The working surface of the working outer lining refers to the surface of the working outer lining contacting the carbonization chamber, and is generally the other outer surface except the connecting surface with the shell of the oven door.
Preferably, the formulation of the glaze comprises the following components: 25-40% of cordierite powder, 10-25% of spodumene powder, 15-30% of fused quartz powder, 3-6% of zircon powder, 8-16% of feldspar powder, 0-5% of borosilicate glass powder, 1-3% of bentonite and 0.1-0.3% of methyl cellulose.
The glaze prepared according to the formula has a similar expansion coefficient to that of the working outer lining, effectively seals air holes on the surface of the working outer lining, avoids erosion of acid and reducing atmosphere, reduces corrosion, and simultaneously prevents carbon deposition by a smooth glaze surface, thereby avoiding damage to a prefabricated member caused by cleaning carbon.
More preferably, the mesh size of the cordierite powder, the spodumene powder, the fused silica powder, the zircon powder and the feldspar powder is about 325 meshes, and the mesh size of the borosilicate glass powder is about 500 meshes.
According to the formula of the glaze, preferably 50-70% of water is added to prepare glaze slurry, the glaze slurry is applied to a working outer lining, glaze firing is carried out at 1280-1320 ℃ after drying, and then the glaze slurry is naturally cooled to below 150 ℃ and discharged.
The invention also provides a preparation method of the sandwich type coke oven door prefabricated part.
The preparation method provided by the invention comprises the step of fixing the heat-insulating lining at a set position in the pre-fabricated mold of the coke oven door and then molding the working outer lining by pouring.
Furthermore, during pouring, the raw materials of the working outer lining are premixed, water accounting for 9-9.5% of the mass of the mixed dry materials is added, the mixture is distributed into a die, and the distribution height is not more than 400 mm.
For the raw material system of the working outer lining provided by the invention, during casting, curing and demolding are preferably carried out, then baking is carried out at 400-500 ℃, heat preservation is carried out, and the temperature is naturally reduced to below 150 ℃ for discharging.
Further, when glaze needs to be applied, the outer lining is glazed after being cast and molded, and the thickness of the glaze layer is controlled to be 1-1.5 mm.
The invention has the beneficial effects that:
the invention provides a sandwich type coke oven door prefabricated part, which solves the problem that various existing coke oven door lining bricks are lost, can effectively avoid the heat-insulating lining from being damaged in the transportation and installation process, reduces the weight of the coke oven door prefabricated part and the whole oven door, improves the heat-insulating property of the coke oven door, reduces the heat loss in a carbonization chamber, improves the maturity of a coke head by improving the temperature at two sides of a machine coke, shortens the coking time, saves energy, improves the coke quality at the same time, is firmly combined with an oven door shell, and has longer service life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a perspective view of a sandwich type coke oven door preform provided in embodiment 1 of the present invention;
FIG. 2 is an external view of a door preform for a sandwich type coke oven provided in example 1 of the present invention;
in the figure: 1: insulating the inner lining; 2: a working outer liner; 3: a fire-resistant glaze layer; 4: installing bolt holes; 5: and (4) mounting the groove.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.
Example 1
The embodiment provides a sandwich type coke oven door prefabricated member, a structural perspective view and an appearance figure of which are shown in fig. 1 and fig. 2, and the sandwich type coke oven door prefabricated member specifically comprises a heat insulation lining 1, a working outer lining 2 and a fireproof glaze layer 3 applied to the surface of the working outer lining 2, wherein a mounting bolt hole 4 is formed in the working outer lining 2, a mounting groove 5 is formed in the mounting surface (namely the surface mounted and connected with an oven door frame shell, the top surface in fig. 1) of the working outer lining 2, the distance between the surface of the heat insulation lining 1 and the working surface (namely the bottom surface in fig. 1) parallel to the mounting surface is 150mm, the distance between the surface of the heat insulation lining 1 and the four side surfaces is 80mm, the distance between the.
The embodiment also provides a preparation method of the sandwich type coke oven door prefabricated part, which comprises the following steps:
step one, burdening and pouring prefabrication of a heat-insulating lining 1: 8-3mm 25% of light mullite (the mass percentage is the same below), 3-0.074mm 20%, 15% of floating bead, 6% of Guangxi mud, 15% of 200-mesh mullite powder, 4% of 150-mesh quartz powder, 15% of high alumina cement and 0.2% of sodium tripolyphosphate. Mixing and stirring for 2-3min, adding 32% of water (accounting for the dry materials), stirring for 3-5min, discharging, then placing into a mold, performing vibration casting molding to prefabricate the heat-insulation lining, curing for 24h, demolding, and curing for more than 24h for later use.
Step two, mixing the working outer lining 2 cordierite-mullite castable: 25% of 8-3mm flint clay, 32% of 3-0.074mm cordierite, 8% of 200-mesh cordierite powder, 18% of 200-mesh mullite powder, 4% of kyanite powder, 7% of silica fume and alumina composite superfine powder, 6% of pure calcium aluminate cement and 0.18% of P530 water reducing agent. Mixing and stirring for 3-5min to complete mixing of the cordierite-mullite castable, detecting and packaging for later use.
And step three, fixing the heat-insulating lining 1 prefabricated in the step one at a set position in a coke oven door precast block mould, pouring the mixed cordierite-mullite castable into a stirrer, adding 9-9.5% of water (accounting for the mixed dry materials), stirring for 3-5min, discharging and distributing into the mould, wherein the height of the distributed material is not more than 400mm, then carrying out vibration molding, demoulding after curing for 24h, curing for more than 24h, then placing into a baking oven, baking to 450 ℃, keeping the temperature for 12h, and then naturally cooling to below 150 ℃ to obtain the finished product.
Step four, preparing a glaze material of the cordierite-spodumene series fire-resistant glaze layer 3: 38% of 325-mesh cordierite powder, 22% of 325-mesh spodumene powder, 18% of 325-mesh fused quartz powder, 5% of 500-mesh zircon powder, 12% of 325-mesh feldspar powder, 3% of 500-mesh borosilicate glass powder, 2% of bentonite and 0.2% (additional) of methyl cellulose. Mixing the above powders, adding 60% water, wet grinding for 12 hr, and making into glaze slip. And (3) spraying the glaze slip on the working surface of the poured working outer lining 2 obtained in the step three, controlling the spraying thickness to be 1.2mm, drying for 3h at normal temperature, drying for 1h at the temperature of 110 ℃, then putting into a high-temperature furnace for glaze firing, taking 72h, and naturally cooling to below 150 ℃, thus completing the sandwich type coke oven door prefabricated part.
Performance testing
The cordierite-mullite castable obtained in the second step of the embodiment 1 is tested for many times under the working temperature condition of a coke oven 950-: body density 2.21g/cm3The apparent porosity is 19.2 percent, the compressive strength is 60-73MPa, the breaking strength is 5.5-7.2MPa, and the strength retention rate is more than 70 percent after being cooled by water for 50 times at 1100 ℃.
And (3) carrying out 1100 ℃ water-cooling thermal shock detection on the cordierite-mullite castable sample block coated with the cordierite-spodumene refractory glaze layer obtained in the fourth step in the example 1, carrying out 1100 ℃ water-cooling thermal shock for 50 times, wherein the surface of the glaze layer is provided with a plurality of punctiform small pits with explosion points, the depth of the pits does not reach the surface of the cordierite-mullite castable sample block, the glaze layer and the sample block are firmly bonded, stripping and falling do not occur, and the glaze surface does not have any destructive cracks.
Comparative example 1
The comparative example provides a coke oven door prefabricated part, which is different from the embodiment 1 in that the heat-insulating lining 1 is made of an aluminum silicate fiber material, is only a small-area thin layer attached and embedded in a working lining, and is tightly attached to an oven door frame shell (the surface is exposed out of the working lining before installation).
The aluminum silicate fiber material has compressibility and no strength, can not be integrated with the working lining, has no supporting function on the working lining (so that a supporting point and a supporting beam are generally required to be arranged under the condition), and is not beneficial to carrying, hoisting and the like; in addition, the thickness of the sticking inlay (generally not more than 50mm) is limited, and the contribution to the reduction of the weight of the furnace door is very little.
Comparative example 2
The comparative example provides a coke oven door prefabricated part which is only different from the embodiment 1 in the step 4, and the formula of the fireproof glaze layer 3 is as follows: 30 parts of fine flint clay powder, 5 parts of fine kaolin powder, 10 parts of fine feldspar powder, 10 parts of zirconia micropowder and 16.5 parts of aluminum dihydrogen phosphate. Uniformly mixing the flint clay fine powder, the kaolin fine powder, the feldspar fine powder and the zirconia micro powder, adding aluminum dihydrogen phosphate to prepare a glaze, mixing the prepared glaze and water according to the weight ratio of 1:0.3, stirring for 1-2 hours to prepare slurry, spraying the prepared slurry on the working surface of the working outer lining 2, wherein the thickness of the coating is 1mm, and preserving heat for 3-5 hours at 1300 ℃.
And (3) carrying out 1100 ℃ water-cooling thermal shock detection on the obtained cordierite-mullite castable sample block coated with the fireproof glaze layer, carrying out 1100 ℃ water-cooling thermal shock for 20 times, so that obvious cracks are formed on the surface of the glaze layer, and stripping off part of glaze after 25 times of water-cooling thermal shock to expose a castable interface.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (10)

1. The sandwich type coke oven door prefabricated part is characterized by comprising a heat insulation inner lining and a working outer lining, wherein the working outer lining wraps the heat insulation inner lining to form a sandwich structure.
2. The sandwich coke oven door preform of claim 1, wherein the insulating lining comprises a volume ratio of the coke oven door preform of 1/4-1/3.
3. The sandwich coke oven door preform according to claim 1 or 2, wherein the insulating inner lining is pre-made and the working outer lining is cast molded on the periphery of the insulating inner lining.
4. The sandwich coke oven door preform of claim 3, wherein the feedstock of the insulating lining comprises 45-65 wt% mullite and the feedstock of the working outer lining comprises 25-55 wt% cordierite and 15-22 wt% mullite.
5. The sandwich coke oven door preform of claim 4, wherein the insulation lining comprises the following raw materials in mass percent: 35-50% of light mullite, 10-18% of floating bead, 4-8% of Guangxi mud, 10-15% of mullite powder, 3-6% of quartz powder, 12-18% of high alumina cement and 0.15-0.3% of sodium tripolyphosphate;
preferably, the light mullite consists of two grades of 8-3mm and 3-0.074mm according to the mass ratio (1-2):1, and the mesh number of the mullite powder is 200-250 meshes.
6. The sandwich coke oven door preform of claim 4, wherein the raw material of the working outer liner comprises, in mass percent: 15-35% of flint clay, 20-40% of cordierite, 5-15% of cordierite powder, 15-22% of mullite powder, 3-6% of kyanite powder, 5-10% of silica fume and alumina composite superfine powder, 4-10% of pure calcium aluminate cement and 0.1-0.3% of water reducing agent;
preferably, the particle size of the flint clay is 8-3mm, the particle size of the cordierite is 3-0.074mm, and the mesh numbers of the cordierite powder and the mullite powder are both 200-250 meshes.
7. The sandwich coke oven door preform of any one of claims 1 to 6, wherein the working face of the working outer lining is glazed.
8. The sandwich coke oven door preform of claim 7, wherein the glaze formulation comprises the following components: 25-40% of cordierite powder, 10-25% of spodumene powder, 15-30% of fused quartz powder, 3-6% of zircon powder, 8-16% of feldspar powder, 0-5% of borosilicate glass powder, 1-3% of bentonite and 0.1-0.3% of methyl cellulose.
9. The method of making a sandwich coke oven door preform of any one of claims 1 to 8, comprising the step of molding the working outer lining by casting after the insulating inner lining is fixed in a set position in the coke oven door preform mold.
10. The method for preparing the preformed unit of the furnace door of the sandwich type coke furnace as claimed in claim 9, wherein during the casting, the raw materials of the working outer lining are premixed, water accounting for 9-9.5% of the mass of the dry materials is added, the mixture is distributed into a mold, and the distribution height is not more than 400 mm.
CN202011323260.4A 2020-11-23 2020-11-23 Sandwich type coke oven door prefabricated part and preparation method thereof Pending CN112344746A (en)

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