CN110563473A - Novel cooling wall refractory material, preparation method and blast furnace cooling wall - Google Patents
Novel cooling wall refractory material, preparation method and blast furnace cooling wall Download PDFInfo
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- CN110563473A CN110563473A CN201910974627.XA CN201910974627A CN110563473A CN 110563473 A CN110563473 A CN 110563473A CN 201910974627 A CN201910974627 A CN 201910974627A CN 110563473 A CN110563473 A CN 110563473A
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- 239000011819 refractory material Substances 0.000 title claims abstract description 106
- 238000001816 cooling Methods 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 163
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 132
- 239000002994 raw material Substances 0.000 claims abstract description 125
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 104
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000004568 cement Substances 0.000 claims abstract description 64
- 239000004014 plasticizer Substances 0.000 claims abstract description 50
- 238000002156 mixing Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007767 bonding agent Substances 0.000 claims abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 196
- 239000000377 silicon dioxide Substances 0.000 claims description 98
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 88
- 229910000831 Steel Inorganic materials 0.000 claims description 59
- 239000000835 fiber Substances 0.000 claims description 59
- 239000010959 steel Substances 0.000 claims description 59
- 239000000203 mixture Substances 0.000 claims description 50
- 239000011230 binding agent Substances 0.000 claims description 39
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical group O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 33
- 238000005266 casting Methods 0.000 claims description 27
- 238000000465 moulding Methods 0.000 claims description 20
- 235000012239 silicon dioxide Nutrition 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 11
- 230000008439 repair process Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 22
- 239000011449 brick Substances 0.000 description 15
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 15
- 230000005484 gravity Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000009970 fire resistant effect Effects 0.000 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 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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- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- C21B7/06—Linings for furnaces
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention relates to a novel cooling wall refractory material, a preparation method thereof and a blast furnace cooling wall, belonging to the technical field of refractory materials, the refractory material comprises a raw material A and a raw material B, wherein the raw material A comprises silicon carbide, ultrafine powder, a plasticizer, a heat conduction promoter, a hardening accelerator and calcium aluminate cement, the raw material B is one of an additional bonding agent or water, and is prepared by mixing, pouring and natural curing, so that the refractory material has good compressive strength and heat conductivity, and the refractory material has the advantages of simple and convenient preparation, easy control and low cost, when the refractory material is applied to the cooling wall of the blast furnace, the refractory layer can be formed by pouring before the cooling wall is installed, the cooling wall can be repaired on line, and the refractory layer is formed by direct pouring, so that the construction of the refractory layer is facilitated, the repair time of the cooling wall is shortened, and the repair cost of the cooling wall is greatly reduced.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a novel cooling wall refractory material, a preparation method and a blast furnace cooling wall.
Background
The blast furnace is the main equipment for iron making, the cooling wall is used for the furnace body, the furnace waist and the furnace belly of the blast furnace, the circulating cooling water pipe is arranged in the cooling wall, and the cooling water cools the furnace body, the furnace waist and the furnace belly of the blast furnace in the iron making process of the blast furnace. The internal surface of stave is provided with the one deck flame retardant coating, and the flame retardant coating protects the stave, not only prevents furnace charges such as ore, coke and wearing and tearing to the stave, avoids high temperature direct action to influence its life in addition in the stave.
At present, the fire-resistant layer of the cooling wall is generally made of silicon carbide ramming mass or silicon carbide bricks. The silicon carbide ramming mass adopts the mode of ramming the construction to form the flame retardant coating at the stave internal surface, but adopts resin bond in the silicon carbide ramming mass, and resin bond receives the influence of stave back filler very easily, contains phenol and formaldehyde in the resin bond, causes the pollution to the environment, and in the ramming work progress, the phenomenon that density is inhomogeneous, intensity fluctuation is big, the spalling damage appears easily in addition in the flame retardant coating. The silicon carbide brick adopts the embedding construction mode to form a fire-resistant layer on the inner surface of the cooling wall, the silicon carbide brick is in rigid contact with the cooling wall, a gap is inevitably left, the heat transfer effect is reduced, the size of the silicon carbide brick needs to be matched with the size of an inner groove of the cooling wall, the size of the silicon carbide brick cannot be completely matched with the inner groove in the actual construction process, so the silicon carbide brick needs to be subjected to on-site cutting and grinding processing, the silicon carbide brick is difficult to process due to the fact that the silicon carbide brick is an abrasive material, and the part of the silicon carbide brick embedded into the inner groove is a weak point of the silicon carbide brick, and is easy to break and fall off.
disclosure of Invention
The invention aims to provide a novel cooling wall refractory material, which has good compressive strength and heat conductivity through the synergistic effect of raw materials, is molded by casting, and is simple and convenient to operate.
The technical purpose of the invention is realized by the following technical scheme:
The novel cooling wall refractory material comprises a raw material A and a raw material B in percentage by weight, wherein the raw material A comprises 66-89% of silicon carbide, 4-15% of ultrafine powder, 1.5-15% of a plasticizer, 0-12% of a heat conduction promoter, 0-2% of a hardening accelerator and 0-12% of calcium aluminate cement, and the raw material B is one of an additional bonding agent or water;
When the raw material B is an additional bonding agent, the hardening accelerator is 0.5-2%, and the addition amount of the additional bonding agent is 6-13% of that of the raw material A;
When the raw material B is water, the calcium aluminate cement accounts for 2-12%, and the addition amount of the water accounts for 4.5-7.5% of that of the raw material A.
By adopting the technical scheme, when the raw material B is the external bonding agent, the external bonding agent has a bonding effect on the raw material, when the raw material B is water, the calcium aluminate cement has a bonding effect on the raw material, through the synergistic effect of the raw materials, the normal-temperature compressive strength of the refractory material after casting molding can reach 38-56MPa, the transportation and installation strength is met, the compressive strength of the refractory material is increased along with the increase of the temperature, after 1450 ℃ is multiplied by 3h, the compressive strength is increased to 118-151MPa, the thermal state rupture strength reaches 38-50MPa, the thermal conductivity reaches 9-20W/m.K, the good compressive strength and thermal conductivity are shown, and the refractory material is cast molding, so that the operation is simple and convenient, and the service life of the cooling wall is prolonged.
More preferably, the hardening accelerator is calcium aluminate cement in percentage by weight;
When the raw material B is an additional bonding agent, the hardening accelerator is 0.5-2%, the calcium aluminate cement is 0%, and the addition amount of the additional bonding agent is 6-13% of that of the raw material A;
when the raw material B is water, the hardening accelerator is 0%, the calcium aluminate cement is 2-12%, and the addition amount of the water is 4.5-7.5% of that of the raw material A.
Through adopting above-mentioned technical scheme, calcium aluminate cement not only plays the adhesive effect to the raw materials, but also can play the effect of promoting hard, and the hardening accelerator adopts calcium aluminate cement, not only reduces the kind of raw materials, reduces the manufacturing cost of product moreover.
More preferably, the particle size D50 of the ultrafine powder is 2 μm or less.
By adopting the technical scheme, the granularity of the ultrafine powder is limited, and the smaller the granularity of the ultrafine powder is, the larger the specific surface area of the ultrafine powder is, the higher the reaction activity is, the reaction and self-combination among raw materials can be promoted, and the properties of the refractory material, such as strength, volume density and the like, can be improved, so that the service life of the refractory material is prolonged.
More preferably, the superfine powder is one or two of alumina superfine powder and silica superfine powder.
By adopting the technical scheme, the superfine powder is further optimized, the alumina superfine powder, the silica superfine powder and an additional binding agent or calcium aluminate cement are combined, the bonding strength is increased along with the increase of the temperature, the condition that the medium temperature strength (800-1100 ℃) is reduced during the combination of the calcium aluminate cement is improved, and the medium temperature and high temperature strength of the refractory material is greatly improved.
More preferably, the additional binder is a silica sol binder.
By adopting the technical scheme, the externally-added binding agent is optimized, and the silica sol binding agent and the raw materials are mutually combined, so that the raw materials show good fluidity, the strength and the volume density of the refractory material are increased, the apparent porosity of the refractory material is reduced, the refractory material shows good volume stability, and the quality stability of the refractory material is improved.
More preferably, the thermal conductivity enhancer is steel fiber.
By adopting the technical scheme, the steel fiber has good thermal conductivity, and the refractory material has good thermal conductivity coefficient, so that when the steel fiber is applied to the cooling wall of the blast furnace, the temperature of the hot surface of the cooling wall can be effectively reduced, the incrustation of slag on the inner surface of the cooling wall of the blast furnace is promoted, a protective layer is formed, and the use stability and the service life of the cooling wall of the blast furnace are improved.
More preferably, the silicon carbide is one or two of silicon carbide aggregate and silicon carbide powder, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is smaller than 200 meshes.
by adopting the technical scheme, the granularity of the silicon carbide is further optimized, the fluidity of the refractory material is improved, the compact packing is realized, and the volume density of the refractory material is improved.
The second purpose of the present invention is to provide a method for preparing the novel refractory material for the cooling wall, which has the advantages of simple and convenient preparation, easy control and low cost.
The technical purpose of the invention is realized by the following technical scheme:
A method for preparing the novel cooling wall refractory material comprises the following steps:
S1, uniformly mixing silicon carbide, ultrafine powder, a plasticizer, a heat conduction promoter, a hardening accelerator and calcium aluminate cement to obtain a raw material A;
S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture;
And S3, casting and molding the mixture, and then naturally curing to obtain the refractory material.
By adopting the technical scheme, the raw material A is uniformly mixed, the raw material B is added later, the mixture has certain fluidity, subsequent casting molding is facilitated, a natural maintenance mode is adopted, the preparation cost of the refractory material is reduced, the preparation of the refractory material is simple, convenient and easy to control, the pollution to the environment is reduced, and the practicability of the refractory material is improved.
The invention also aims to provide a blast furnace cooling wall, wherein the refractory layer can be formed by casting before the cooling wall is installed, and can also be formed by on-line repairing and direct casting of the cooling wall, so that the construction of the refractory layer is facilitated, the repairing time of the cooling wall is shortened, and the repairing cost of the cooling wall is greatly reduced.
the technical purpose of the invention is realized by the following technical scheme:
The blast furnace cooling wall comprises a cooling wall and a refractory layer, wherein the refractory layer is cast by the refractory material, and the refractory layer is positioned on the inner surface of the cooling wall.
By adopting the technical scheme, the refractory material forms the refractory layer on the cooling wall of the blast furnace, after the blast furnace is put into production, the compressive strength of the refractory layer is rapidly improved along with the rise of the temperature, the production requirement is met, and the cooling wall of the blast furnace has good service life.
Meanwhile, after the refractory layer of the cooling wall falls off, in the maintenance period of the blast furnace, under the condition that the cooling wall is not removed, a mold is arranged on one side of the inner surface of the cooling wall, then the pouring of the refractory material is completed between the mold and the cooling wall to form the refractory layer, namely, the refractory layer can also be used for repairing the cooling wall on line and is directly poured, so that the repairing time of the cooling wall is shortened, and the repairing cost of the cooling wall is greatly reduced.
In conclusion, the invention has the following beneficial effects:
Firstly, the novel cooling wall refractory material disclosed by the invention has good compressive strength through the synergistic effect of the raw materials, and is simple and convenient to operate because the refractory material is molded by casting.
Secondly, after the novel cooling wall refractory material is cast and molded, natural curing is adopted, the normal-temperature compressive strength of the refractory material can reach 38-56MPa, the requirements on transportation and installation strength are met, the compressive strength of the refractory material is increased along with the increase of the temperature, after 1450 ℃ for 3h, the compressive strength is increased to 118-151MPa, the thermal-state rupture strength reaches 38-50MPa, the requirements of the cooling wall on the strength of the refractory material are met, and the production stability and the quality stability of the refractory material are ensured by the casting mode.
Thirdly, the novel cooling wall refractory material has good heat conductivity coefficient, effectively reduces the temperature of the hot surface of the cooling wall, can promote the incrustation of slag in the blast furnace on the inner surface of the cooling wall of the blast furnace, forms a self-protection layer, and improves the use stability and the service life of the cooling wall of the blast furnace.
Fourthly, the method for preparing the novel cooling wall refractory material has the advantages of simple and convenient preparation, easy control and low cost.
Fifth, the blast furnace stave of the present invention can be formed by casting the refractory layer during the stave processing, and can also be formed by on-line repairing the stave, by direct casting, which not only facilitates the construction of the refractory layer, but also shortens the repair time of the stave and greatly reduces the repair cost of the stave.
Detailed Description
The present invention will be described in further detail with reference to examples. It should be understood that the preparation methods described in the examples are only for illustrating the present invention and are not to be construed as limiting the present invention, and that the simple modifications of the preparation methods of the present invention based on the concept of the present invention are within the scope of the present invention as claimed.
Table 1 shows the content of each raw material of the refractory in examples (unit:%)
Example 1
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
The silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 73:16, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 5.5:2.5, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 2 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1.5 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 20%, the weight content of silicon dioxide is 70%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 20mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
and S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-40, the weight content of silica in the silica sol binding agent is 40%, and the specific gravity is 1.1.
And S3, casting and molding the mixture, and then curing for 60 hours at the ambient temperature of 5 ℃ to obtain the refractory material.
Example 2
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
The silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 73:16, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 3:2, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 2 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1.5 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 25%, the weight content of silicon dioxide is 63%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 16mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 70%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-30, and the silica sol binding agent contains 30% by weight of silica and has a specific gravity of 1.2.
And S3, casting and molding the mixture, and then curing for 48 hours at the ambient temperature of 15 ℃ to obtain the refractory material.
example 3
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
The silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 73:16, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 2.5:1.5, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 1.5 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1.5 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 28%, the weight content of silicon dioxide is 62%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 12mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 70%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-35, and the silica sol binding agent contains 35% by weight of silica and has a specific gravity of 1.2.
And S3, casting and molding the mixture, and then curing for 40h at the ambient temperature of 20 ℃ to obtain the refractory material.
Example 4
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
Wherein, the silicon carbide is silicon carbide aggregate, and the granularity of the silicon carbide aggregate is 3-0 mm; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 7:1, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 1 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 2 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 25%, the weight content of silicon dioxide is 63%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 8mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
and S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-40, the weight content of silica in the silica sol binding agent is 40%, and the specific gravity is 1.3.
And S3, casting and molding the mixture, and then curing for 24 hours at the ambient temperature of 30 ℃ to obtain the refractory material.
Example 5
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
the silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 60:15, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 4:4, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 1.5 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 28%, the weight content of silicon dioxide is 62%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the average length of the steel fibers is 5mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the calcium aluminate cement contains 75 wt% of alumina and has a particle size smaller than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-30, and the silica sol binding agent contains 30% by weight of silica and has a specific gravity of 1.1.
and S3, casting and molding the mixture, and then curing for 12 hours at the ambient temperature of 40 ℃ to obtain the refractory material.
Example 6
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
The silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 73:6.5, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 6:4, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 1.5 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 28%, the weight content of silicon dioxide is 62%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 16mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-30, and the silica sol binding agent contains 30% by weight of silica and has a specific gravity of 1.1.
and S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
Example 7
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer and the hardening accelerator to obtain the raw material A.
wherein the silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 73:8.5, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 6:4, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 1.5 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 25%, the weight content of silicon dioxide is 63%, and the granularity is less than 200 meshes; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-30, and the silica sol binding agent contains 30% by weight of silica and has a specific gravity of 1.1.
And S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
Example 8
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
The silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 73:6.5, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is alumina superfine powder, the weight content of alumina in the alumina superfine powder is 99.5 percent, and the granularity D50 of the alumina superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 25%, the weight content of silicon dioxide is 63%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 20mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
and S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-40, the weight content of silica in the silica sol binding agent is 40%, and the specific gravity is 1.3.
And S3, casting and molding the mixture, and then curing for 24 hours at the ambient temperature of 30 ℃ to obtain the refractory material.
Example 9
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
The silicon carbide is silicon carbide aggregate and silicon carbide powder, the weight ratio of the silicon carbide aggregate to the silicon carbide powder is 73:6.5, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes; the superfine powder is silica superfine powder, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 2 μm; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 28%, the weight content of silicon dioxide is 62%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 12mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-40, the weight content of silica in the silica sol binding agent is 40%, and the specific gravity is 1.3.
And S3, casting and molding the mixture, and then curing for 24 hours at the ambient temperature of 30 ℃ to obtain the refractory material.
Example 10
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction promoter and the hardening accelerator to obtain the raw material A.
Wherein, the silicon carbide is silicon carbide aggregate, and the granularity of the silicon carbide aggregate is 3-0 mm; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 6:4, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 2 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 20%, the weight content of silicon dioxide is 70%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 5mm, and the average width of the steel fibers is 1 mm; the hardening accelerator is calcium aluminate cement, the calcium aluminate cement is CA70, and the calcium aluminate cement contains 75 wt% of alumina and has a particle size smaller than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts a silica sol binding agent, the silica sol binding agent adopts GN-30, and the silica sol binding agent contains 30% by weight of silica and has a specific gravity of 1.1.
And S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
Example 11
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction accelerant and the calcium aluminate cement to obtain the raw material A.
Wherein, the silicon carbide is silicon carbide aggregate, and the granularity of the silicon carbide aggregate is 3-0 mm; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 6:4, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 2 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 28%, the weight content of silicon dioxide is 62%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 20mm, and the average width of the steel fibers is 1 mm; the calcium aluminate cement adopts CA70, and the weight content of alumina in the calcium aluminate cement is 68%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts water.
And S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
Example 12
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction accelerant and the calcium aluminate cement to obtain the raw material A.
Wherein, the silicon carbide is silicon carbide aggregate, and the granularity of the silicon carbide aggregate is 3-0 mm; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 4:6, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 2 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 25%, the weight content of silicon dioxide is 63%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 16mm, and the average width of the steel fibers is 1 mm; the calcium aluminate cement adopts CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts water.
And S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
Example 13
the raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction accelerant and the calcium aluminate cement to obtain the raw material A.
Wherein, the silicon carbide is silicon carbide aggregate, and the granularity of the silicon carbide aggregate is 3-0 mm; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 2:8, the weight content of alumina in the alumina superfine powder is 99%, the granularity D50 of the alumina superfine powder is 1 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 2 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 28%, the weight content of silicon dioxide is 62%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 12mm, and the average width of the steel fibers is 1 mm; the calcium aluminate cement adopts CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts water.
And S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
Example 14
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
s1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction accelerant and the calcium aluminate cement to obtain the raw material A.
Wherein, the silicon carbide is silicon carbide aggregate, and the granularity of the silicon carbide aggregate is 3-0 mm; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 1:10, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 2 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 28%, the weight content of silicon dioxide is 62%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 8mm, and the average width of the steel fibers is 1 mm; the calcium aluminate cement adopts CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts water.
And S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
Example 15
The raw material ratio of the novel cooling wall refractory material is shown in table 1.
S1, uniformly mixing the silicon carbide, the ultrafine powder, the plasticizer, the heat conduction accelerant and the calcium aluminate cement to obtain the raw material A.
Wherein, the silicon carbide is silicon carbide aggregate, and the granularity of the silicon carbide aggregate is 3-0 mm; the superfine powder is a mixture of alumina superfine powder and silica superfine powder, the weight ratio of the alumina superfine powder to the silica superfine powder is 5:10, the weight content of alumina in the alumina superfine powder is 99.5%, the granularity D50 of the alumina superfine powder is 2 mu m, the weight content of silica in the silica superfine powder is 97%, and the granularity D50 of the silica superfine powder is 1 mu m; the plasticizer adopts QN25, wherein the weight content of aluminum oxide in the plasticizer is 25%, the weight content of silicon dioxide is 63%, and the granularity is less than 200 meshes; the heat conduction accelerant adopts steel fibers, the steel fibers adopt 446#, the average length of the steel fibers is 5mm, and the average width of the steel fibers is 1 mm; the calcium aluminate cement adopts CA70, and the weight content of alumina in the calcium aluminate cement is 71%, and the granularity is less than 200 meshes.
And S2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture, wherein the raw material B adopts water.
And S3, casting and molding the mixture, and then curing for 20 hours at the ambient temperature of 35 ℃ to obtain the refractory material.
example 16
A blast furnace cooling wall comprises a cooling wall and a refractory layer, wherein the refractory layer is made of a refractory material through pouring, and is arranged on the inner surface of the cooling wall.
The fire-resistant layer can be cast when the cooling wall is processed, and can also be cast when the cooling wall is repaired on line.
When the cooling wall is repaired on line, the following method is adopted for pouring the fire-resistant layer:
After the refractory layer of the stave is detached, a mold is set on one side of the inner surface of the stave without removing the stave during maintenance, and then casting of the refractory is completed between the mold and the stave, and the refractory layer is formed.
The refractory layer adopts the mode of pouring, has shortened the repair time of cooling wall, reduces the cooling wall repair cost by a wide margin.
Comparative example 1
A commercial silicon carbide ramming mass TSD was used.
Comparative example 2
A commercial silicon carbide brick TDG-1 is adopted.
The refractory materials of examples 1 to 15 were tested for compressive strength at different temperatures, and the results are shown in Table 2.
Wherein, the compressive strength is detected according to GB/T5072-2008 'test method for compressive strength of refractory material at normal temperature'.
TABLE 2 compressive Strength test results at different temperatures (Unit: MPa)
| Heat treatment temperature/(. degree. C.) | 25 | 110 | 200 | 800 | 1450 |
| Example 1 | 40 | 43 | 45 | 51 | 130 |
| Example 2 | 43 | 45 | 45 | 58 | 140 |
| Example 3 | 39 | 40 | 40 | 55 | 126 |
| Example 4 | 38 | 46 | 53 | 65 | 126 |
| Example 5 | 44 | 58 | 66 | 81 | 118 |
| Example 6 | 43 | 48 | 48 | 58 | 145 |
| example 7 | 41 | 45 | 45 | 55 | 136 |
| example 8 | 39 | 43 | 43 | 55 | 135 |
| example 9 | 38 | 42 | 43 | 52 | 133 |
| Example 10 | 42 | 42 | 42 | 53 | 130 |
| Example 11 | 39 | 48 | 48 | 65 | 119 |
| example 12 | 50 | 85 | 91 | 95 | 139 |
| Example 13 | 51 | 88 | 95 | 99 | 144 |
| Example 14 | 50 | 98 | 103 | 104 | 144 |
| Example 15 | 56 | 105 | 108 | 112 | 151 |
As can be seen from Table 2, the compressive strength of the refractory material of the present invention gradually increases with the increase of temperature, which is mainly due to the synergistic effect between the ultrafine powder and the additional binder or calcium aluminate cement, which promotes the self-bonding between the raw materials and makes the refractory material show good compressive strength, and after the mixture is cast and cured naturally, sufficient transportation strength and installation strength can be generated, and when it is applied to the cooling wall of a blast furnace, the strength of the refractory material of the present invention rapidly increases with the increase of temperature after the blast furnace is put into operation, and the requirement of the cooling wall for the strength of the refractory material is satisfied.
the following performance tests were carried out on the refractory materials obtained in examples 1 to 15 and comparative examples 1 to 2, and the test results are shown in Table 3.
Wherein, according to GB/T2997-2015 'test method for bulk density, apparent porosity and true apparent porosity of compact shaped refractory product', the apparent porosity and the bulk density are detected;
Detecting the thermal conductivity according to GB/T22588-2008 'flash method measurement thermal diffusivity or thermal conductivity';
Detecting the high-temperature rupture strength according to GB/T3002-2017 'test method for high-temperature rupture strength of refractory material';
Detecting the compressive strength according to GB/T5072-2008 'test method for normal temperature compressive strength of refractory material';
According to GB/T5988-2007 refractory material heating permanent line change test method, the line change rate is detected.
Wherein, the high temperature bending strength detection in the embodiments 1 to 15 all need to be performed with pretreatment under the condition of 1450 ℃ for 3h to show the real strength of the refractory material;
The test result of the compressive strength in comparative example 1 was a test result of 200 ℃ x 24h to reflect the true strength of the silicon carbide ramming mass.
TABLE 3 test results
As can be seen from Table 3, compared with a silicon carbide ramming mass, the refractory material disclosed by the invention has the advantages that the apparent porosity is reduced, the volume density is improved, the appropriate linear variability after firing is 0.01-0.09%, the refractory material has a good thermal conductivity coefficient which reaches 9-20W/m.K, the high-temperature rupture strength reaches 38-50MPa, the normal-temperature compressive strength reaches 38-56MPa, and the high-temperature fired compressive strength reaches 118-151MPa, so that the technical requirements of long service life and high efficiency of a cooling wall can be better met.
The refractory material adopts a pouring construction process, does not need one-hammer-one-hammer ramming construction like silicon carbide ramming materials, and has simple and convenient construction and more uniform and controllable construction quality.
The refractory material can meet the requirements of transportation and installation strength by adopting natural maintenance, and can generate proper strength without heat treatment at 200-300 ℃ like a silicon carbide ramming mass; meanwhile, the silicon carbide ramming mass adopts a resin binder, and harmful gases such as formaldehyde, phenol and the like are released in the heating treatment process, so that the refractory material is more environment-friendly.
As can be seen from Table 3, the refractory of the present invention can achieve the apparent porosity and bulk density of the silicon carbide brick, and also has good high-temperature rupture strength, normal-temperature compressive strength and linear change rate after firing, as compared with the silicon carbide brick.
Meanwhile, the refractory material does not need to generate bonding strength by a nitriding method like a silicon carbide brick, and does not need to carry out complex embedding construction like the silicon carbide brick.
As can be seen from Table 3, the ultrafine powder of the present invention is a mixture of alumina ultrafine powder and silica ultrafine powder, and has a larger specific surface area, a strong self-binding ability, a higher reactivity, and is more favorable for secondary mullite at high temperature, the linear change rate of the refractory material is reasonably controlled, the micro-expansion characteristic of the refractory material is realized, and the refractory material is in close contact with the cooling wall.
As can be seen from Table 3, the heat conductivity of the refractory material of the present invention is positively improved with the increase of the amount of the heat conductivity enhancer, which provides a flexible and convenient technical control means for the design of the heat conductivity of the refractory material. However, since the addition amount of the heat conduction promoter is too large due to insufficient refractoriness, other properties of the refractory are deteriorated, and in practical use, the addition amount of the heat conduction promoter should be within the range of the present invention.
Claims (9)
1. A novel cooling wall refractory material is characterized in that: the refractory material comprises a raw material A and a raw material B in percentage by weight, wherein the raw material A comprises 66-89% of silicon carbide, 4-15% of ultrafine powder, 1.5-15% of a plasticizer, 0-12% of a heat conduction promoter, 0-2% of a hardening accelerator and 0-12% of calcium aluminate cement, and the raw material B is one of an additional bonding agent or water;
When the raw material B is an additional bonding agent, the hardening accelerator is 0.5-2%, and the addition amount of the additional bonding agent is 6-13% of that of the raw material A;
When the raw material B is water, the calcium aluminate cement accounts for 2-12%, and the addition amount of the water accounts for 4.5-7.5% of that of the raw material A.
2. The refractory material for a stave cooler according to claim 1, wherein: according to weight percentage, the hardening accelerator is calcium aluminate cement;
When the raw material B is an additional bonding agent, the hardening accelerator is 0.5-2%, the calcium aluminate cement is 0%, and the addition amount of the additional bonding agent is 6-13% of that of the raw material A;
When the raw material B is water, the hardening accelerator is 0%, the calcium aluminate cement is 2-12%, and the addition amount of the water is 4.5-7.5% of that of the raw material A.
3. the refractory material for a stave cooler according to claim 1, wherein: the particle size D50 of the superfine powder is less than or equal to 2 μm.
4. The refractory material for a stave cooler according to claim 1, wherein: the superfine powder is one or two of alumina superfine powder and silicon dioxide superfine powder.
5. The refractory material for a stave cooler according to claim 1, wherein: the additional binding agent is a silica sol binding agent.
6. The refractory material for a stave cooler according to claim 1, wherein: the heat conduction accelerant is steel fiber.
7. The refractory material for a stave cooler according to claim 1, wherein: the silicon carbide is one or two of silicon carbide aggregate and silicon carbide powder, the granularity of the silicon carbide aggregate is 3-0mm, and the granularity of the silicon carbide powder is less than 200 meshes.
8. A method for preparing the novel stave refractory of any one of claims 1 to 7, characterized by comprising the steps of:
S1, uniformly mixing silicon carbide, ultrafine powder, a plasticizer, a heat conduction promoter, a hardening accelerator and calcium aluminate cement to obtain a raw material A;
s2, adding the raw material B into the raw material A, and uniformly mixing to obtain a mixture;
And S3, casting and molding the mixture, and then naturally curing to obtain the refractory material.
9. A blast furnace stave comprising a stave and a refractory layer cast from the refractory material of any one of claims 1 to 7 on an inner surface of the stave.
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| CN114133255A (en) * | 2021-12-17 | 2022-03-04 | 河北鑫达钢铁集团有限公司 | Heating furnace heat storage box body repairing material and preparation method thereof |
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Application publication date: 20191213 |