CN116143502A - Silica sol combined iron runner prefabricated member and preparation method thereof - Google Patents
Silica sol combined iron runner prefabricated member and preparation method thereof Download PDFInfo
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- CN116143502A CN116143502A CN202211341348.8A CN202211341348A CN116143502A CN 116143502 A CN116143502 A CN 116143502A CN 202211341348 A CN202211341348 A CN 202211341348A CN 116143502 A CN116143502 A CN 116143502A
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- silica sol
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- iron runner
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 39
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 239000003381 stabilizer Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000010431 corundum Substances 0.000 claims abstract description 3
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 239000010703 silicon Substances 0.000 claims abstract description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 36
- 239000000203 mixture Substances 0.000 claims description 35
- 238000002156 mixing Methods 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- ZCLVNIZJEKLGFA-UHFFFAOYSA-H bis(4,5-dioxo-1,3,2-dioxalumolan-2-yl) oxalate Chemical compound [Al+3].[Al+3].[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O ZCLVNIZJEKLGFA-UHFFFAOYSA-H 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 239000010426 asphalt Substances 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- 239000000571 coke Substances 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims 1
- 229910052849 andalusite Inorganic materials 0.000 claims 1
- 229910052850 kyanite Inorganic materials 0.000 claims 1
- 239000010443 kyanite Substances 0.000 claims 1
- 229910052851 sillimanite Inorganic materials 0.000 claims 1
- 230000036571 hydration Effects 0.000 abstract description 4
- 238000006703 hydration reaction Methods 0.000 abstract description 4
- 239000011819 refractory material Substances 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 abstract 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910004298 SiO 2 Inorganic materials 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 239000004568 cement Substances 0.000 abstract 1
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 239000010433 feldspar Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 5
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- VXYADVIJALMOEQ-UHFFFAOYSA-K tris(lactato)aluminium Chemical compound CC(O)C(=O)O[Al](OC(=O)C(C)O)OC(=O)C(C)O VXYADVIJALMOEQ-UHFFFAOYSA-K 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
- C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
-
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
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- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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Abstract
The invention belongs to the technical field of refractory materials, and relates to a silica sol combined iron runner prefabricated member and a preparation method thereof. Proposes a silica sol combined with Al 2 O 3 -SiC-C castable and method for preparing an iron runner preform using the same. The prefabricated member contains alumina with granularity of 25-0.044mm 0-74%, corundum with granularity of 25-0.044mm 0-76%, silicon carbide with granularity of 2.5-0.044mm 10-25%, alumina micropowder with granularity of 5-0.5 mu m 5-12%, silica micropowder with granularity less than 1 mu m 1-4%, volume stabilizer with granularity of 1-0.12mm 0.8-3%, carbon source with granularity of 1-0.044mm 0.5-5%, simple substance silicon with granularity of 0.12-0.044mm 0.5-5%, metallic aluminium with granularity of 0.2-0.044mm 0.06-4%, aluminum nitride powder with granularity of 100-2 mu m 0.2-3.5%, water reducing agent 0.1-0.2%, and SiO 2 as additive 2 Silica sol with content of 28-30%5-8%. The prefabricated member does not contain cement, reduces the introduction of calcium, can play a role in cementing by virtue of hydration heat release of metal aluminum and aluminum nitride, simultaneously promotes the coagulation of silica sol, improves the thermal shock resistance of the prefabricated member, reduces occurrence of feldspar low-melting-matter phases, and prolongs the service life of an iron runner.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and mainly relates to a silica sol combined iron runner prefabricated member and a preparation method thereof.
Background
Molten iron from the blast furnace flows out from a blast furnace tapping hole, passes through a main runner, a runner and a swinging runner of a molten iron yard to a ladle, and iron slag enters a slag runner when passing through a slag skimmer. Wherein the carbon-containing material is oxidized, slag, molten iron, chemical erosion of slag iron, spalling and scouring erosion caused by thermal shock of molten iron, and the like are experienced. The iron amount is generally 10-15 ten thousand t, and the iron amount can reach more than 30 ten thousand t after the iron is subjected to the repair or the sleeve repair; the partial damage of the iron runner is a common phenomenon, and whether the damaged part of the castable can be quickly repaired is related to the service life cycle, the maintenance times, the maintenance time, the furnace break time of the blast furnace and the like; the time interval of blast furnace tapping is generally 1.5-2 h, once the iron runner is abnormal, the iron runner needs to be repaired in time, and the middle of the iron runner needs to be subjected to the steps of iron residue discharging, runner disassembly, formwork supporting, runner supplementing, form removing, baking and the like, the interval time is at least 8h, even more than 20h, and the loss is great for an iron works, so that the iron runner needs to be repaired in site grasping time, the construction time is shortened, and the normal use of the iron runner is restored; the prefabricated block can be industrially produced, can be pulled to the site of the iron runner after being subjected to low-temperature treatment, has high lining building speed, can be used without baking, and has longer service life.
Because the prefabricated member has poor air permeability, explosion caused by water flash evaporation is easy to occur in the baking process, generally, an explosion-proof agent such as metal aluminum, aluminum lactate, explosion-proof fibers and the like is required to be added, but the addition amount of the explosion-proof agent is strictly controlled, the addition amount is too large, the reduction of volume density, the reduction of strength, the corrosion resistance and the deterioration of anti-scouring performance are caused, the addition amount is small, the explosion-proof effect is not always achieved, and the explosion of materials is greatly influenced by the temperature, the water addition amount and the hardening time of a construction environment.
Disclosure of Invention
In order to reduce the influence of construction environment temperature, hydration heat release of materials and condensation of materials on a formed prefabricated member, the invention provides a silica sol combined iron runner prefabricated member and a preparation method thereof, and aims to prevent the problems of transitional shrinkage of materials, swelling caused by hydration of metal aluminum and the like caused by dehydration hardening of silica sol, and simultaneously provides a direction for a cement-free castable.
The invention adopts the following technical scheme for accomplishing the purposes:
a silica sol bonded iron runner preform, characterized by: the materials comprise a mixture and an external feed;
1) The raw materials of the mixture comprise the following components in percentage by mass:
alumina 25-0.044mm 0-74%
Corundum 25-0.044mm 0-76%;
2.5-0.044mm 10-25% of silicon carbide;
5-0.5 mu m 5-12% of alumina micropowder;
silica micropowder less than 1 mu m 0-4%;
1-0.12mm 0.8-3% of volume stabilizer;
1-0.044mm of carbon source and 0.5-5%;
0.12-0.044mm 0.5-5% of elemental silicon;
0.2-0.044mm 0.06-4% of metallic aluminum;
100-2 mu m of aluminum nitride powder and 0.2-3.5 percent;
2) The external material comprises the following raw materials in percentage by mass in the mixture:
0.1 to 0.2 percent of water reducer;
5-8% of silica sol;
wherein the silica sol is industrial silica sol, and the content of silicon oxide is 28-30%; the mass of the external feeding material is the external quantity of the total mass of the mixture.
The specific manufacturing steps are as follows:
(1) mixing 100% of the mixture and 0.1-0.2% of the water reducer, pouring into a forced mixer, mixing for 2-3 min, adding 5-8% of silica sol, and wet mixing for 4-6 min to enable the vibration flow value of the material to be 190-220 mm, thus discharging;
(2) opening an inserted high-frequency vibrating rod with the phi of 50mm, pouring the wet material in the step (1) into a prefabricated member mould, vibrating while feeding until the feeding is finished, and vibrating for 2-3 min until the surface is flooded and a large number of bubbles are not discharged;
(3) after the prefabricated member is formed, the prefabricated member and the mould are kept stand and maintained for more than 24 hours, and then the prefabricated member is demoulded and maintained for 24-48 hours. The optimal temperature for molding and curing is 10-30 ℃;
(4) placing the cured prefabricated part in a drying kiln at 300-450 ℃ for drying;
(5) and cooling the prefabricated part to normal temperature, taking out and checking the appearance, and sending the qualified prefabricated part to the field for use.
The volume stabilizer is used for thermal decomposition at high temperature to generate volume effect and compensate sintering shrinkage of the refractory material.
The carbon source is one or a mixture of polymerized aluminum oxalate, coke, asphalt, carbon black, graphite and solid resin powder; the polymeric aluminum oxalate is not only a wetting agent for carbonaceous materials, but also a volume stabilizer, and can also assist the reaction of metallic aluminum and aluminum nitride with water.
The metal aluminum and the aluminum nitride powder are bulk materials and are not single in granularity, and the granularity range is 0.2-0.002 mm, so that hydration heat release energy is continuously carried out, and an air hole channel is kept to be opened all the time in the reaction process.
The silica sol is dehydrated in the condensation process to form a siloxane '-Si-O-Si' -gel network structure, so that the prefabricated member is hardened to form strength, simultaneously, the metal aluminum and the aluminum nitride powder react with water to form gel and gas, thereby not only promoting the hardening of the material, but also keeping the material in a micro-expansion state by a pressure space formed by the gas, relieving the shrinkage of the material and strengthening the anti-burst property of the material. When the dehydration of the material is finished, the agglomeration and the combination of the silica sol are finished, the strength is increased, and part of metal aluminum and aluminum nitride powder which do not participate in the reaction can be used as an antioxidant and remain in the material, so that the slag resistance of the prefabricated member is facilitated.
The invention provides a silica sol combined iron runner prefabricated member and a preparation method thereof, wherein metal aluminum and aluminum nitride exist in the silica sol combined iron runner prefabricated member in a combined mode, and the silica sol combined iron runner prefabricated member is not only an explosion-proof agent, a coagulant, a bonding agent and an antioxidant, but also expansion of materials is considered, so that condensation shrinkage of the silica sol is relieved, and cracks of the prefabricated member are avoided. The polyaluminum oxalate has high viscosity, and in the drying process, the polyaluminum oxalate presents a micro-expansion trend along with the loss of moisture, so that the shrinkage of the material is effectively prevented. With the volatilization of oxalate, the formed pore canal is favorable for the discharge of moisture, and the risk of bursting of the prefabricated member is reduced.
Detailed Description
The specific technical scheme of the present invention will be further described with reference to comparative examples in the following.
Example 1:
1. a silica sol bonded iron runner preform, characterized by: the materials include a mix and an external charge.
1) The raw material composition, granularity and mass percentage of the mixture are shown in table 1:
2) The composition of the externally fed raw materials and the mass percentage of the externally fed raw materials in the mixture are shown in table 1:
the specific manufacturing steps are as follows:
(1) mixing 100% of the mixture and 0.12% of the water reducer, pouring into a forced mixer, mixing for 2-3 min, adding 5.2% of silica sol, and wet mixing for 4-6 min to enable the vibration flow value of the material to be 190-220 mm, thus discharging;
(2) opening an inserted high-frequency vibrating rod with the phi of 50mm, pouring the wet material in the step (1) into a prefabricated member mould, vibrating while feeding until the feeding is finished, and vibrating for 2-3 min until the surface is flooded and a large number of bubbles are not discharged;
(3) after the prefabricated member is formed, the prefabricated member and the mould are kept stand and maintained for more than 24 hours, and then the prefabricated member is demoulded and maintained for 24-48 hours. The optimal temperature for molding and curing is 10-30 ℃;
(4) placing the cured prefabricated part in a drying kiln at 300-450 ℃ for drying;
(5) and cooling the prefabricated part to normal temperature, taking out and checking the appearance, and sending the qualified prefabricated part to the field for use.
The prefabricated member is mainly used for the main ditch.
Example 2:
1. a silica sol bonded iron runner preform, characterized by: the materials include a mix and an external charge.
1) The raw material composition, granularity and mass percentage of the mixture are shown in table 1:
2) The composition of the externally fed raw materials and the mass percentage of the externally fed raw materials in the mixture are shown in table 1:
the specific manufacturing steps are as follows:
(1) mixing 100% of the mixture and 0.12% of the water reducer, pouring into a forced mixer, mixing for 2-3 min, adding 5.8% of silica sol, and wet mixing for 4-6 min to enable the vibration flow value of the material to be 190-220 mm, thus discharging;
(2) opening an inserted high-frequency vibrating rod with the phi of 50mm, pouring the wet material in the step (1) into a prefabricated member mould, vibrating while feeding until the feeding is finished, and vibrating for 2-3 min until the surface is flooded and a large number of bubbles are not discharged;
(3) after the prefabricated member is formed, the prefabricated member and the mould are kept stand and maintained for more than 24 hours, and then the prefabricated member is demoulded and maintained for 24-48 hours. The optimal temperature for molding and curing is 10-30 ℃;
(4) placing the cured prefabricated part in a drying kiln at 300-450 ℃ for drying;
(5) and cooling the prefabricated part to normal temperature, taking out and checking the appearance, and sending the qualified prefabricated part to the field for use.
The preform is mainly used as a skimmer.
Example 3:
1. a silica sol bonded iron runner preform, characterized by: the materials include a mix and an external charge.
1) The raw material composition, granularity and mass percentage of the mixture are shown in table 1:
2) The composition of the externally fed raw materials and the mass percentage of the externally fed raw materials in the mixture are shown in table 1:
the specific manufacturing steps are as follows:
(1) mixing 100% of the mixture and 0.15% of the water reducer, pouring into a forced mixer, mixing for 2-3 min, adding 6.8% of silica sol, and wet mixing for 4-6 min to enable the vibration flow value of the material to be 190-220 mm, thus discharging;
(2) opening an inserted high-frequency vibrating rod with the phi of 50mm, pouring the wet material in the step (1) into a prefabricated member mould, vibrating while feeding until the feeding is finished, and vibrating for 2-3 min until the surface is flooded and a large number of bubbles are not discharged;
(3) after the prefabricated member is formed, the prefabricated member and the mould are kept stand and maintained for more than 24 hours, and then the prefabricated member is demoulded and maintained for 24-48 hours. The optimal temperature for molding and curing is 10-30 ℃;
(4) placing the cured prefabricated part in a drying kiln at 300-450 ℃ for drying;
(5) and cooling the prefabricated part to normal temperature, taking out and checking the appearance, and sending the qualified prefabricated part to the field for use.
The preform is mainly used on the iron runner and the swing runner.
Example 4:
1. a silica sol bonded iron runner preform, characterized by: the materials include a mix and an external charge.
1) The raw material composition, granularity and mass percentage of the mixture are shown in table 1:
2) The composition of the externally fed raw materials and the mass percentage of the externally fed raw materials in the mixture are shown in table 1:
the specific manufacturing steps are as follows:
(1) mixing 100% of the mixture and 0.2% of the water reducer, pouring into a forced mixer, mixing for 2-3 min, adding 8% of silica sol, and wet mixing for 4-6 min to enable the vibration flow value of the material to be 190-220 mm, thus discharging;
(2) opening an inserted high-frequency vibrating rod with the phi of 50mm, pouring the wet material in the step (1) into a prefabricated member mould, vibrating while feeding until the feeding is finished, and vibrating for 2-3 min until the surface is flooded and a large number of bubbles are not discharged;
(3) after the prefabricated member is formed, the prefabricated member and the mould are kept stand and maintained for more than 24 hours, and then the prefabricated member is demoulded and maintained for 24-48 hours. The optimal temperature for molding and curing is 10-30 ℃;
(4) placing the cured prefabricated part in a drying kiln at 300-450 ℃ for drying;
(5) and cooling the prefabricated part to normal temperature, taking out and checking the appearance, and sending the qualified prefabricated part to the field for use.
The prefabricated member is mainly used for slag runner.
Table 1 Components and specific formulation schemes of examples and comparative examples
Table 2 performance index of preforms cast by examples and comparative examples
Note that: a represents 110 ℃ for 3h, b represents 400 ℃ for 3h, and c represents 1500 ℃ for 3h.
Claims (5)
1. A silica sol bonded iron runner preform, characterized by: the raw materials of the iron runner prefabricated member comprise a mixture and external feeding materials;
1) The raw materials of the mixture comprise the following components in percentage by mass:
alumina 25-0.044mm 0-74%;
corundum 25-0.044mm 0-76%;
2.5-0.044mm 10-25% of silicon carbide;
5-0.5 mu m 5-12% of alumina micropowder;
the silicon oxide micro powder is less than 1 mu m and 1 to 4 percent;
1-0.12mm 0.8-3% of volume stabilizer;
1-0.044mm of carbon source and 0.5-5%;
0.12-0.044mm 0.5-5% of elemental silicon;
0.2-0.044mm 0.06-4% of metallic aluminum;
100-2 mu m of aluminum nitride powder and 0.2-3.5 percent;
2) The external material comprises the following raw materials in percentage by mass:
0.1 to 0.2 percent of water reducer;
5-8% of silica sol;
wherein the silica sol is industrial-grade silica sol, and the content of silicon oxide is 28-30%.
2. A silica sol bonded iron runner preform as in claim 1 wherein: the volume stabilizer is one of kyanite, sillimanite and andalusite.
3. A silica sol bonded iron runner preform as in claim 1 wherein: the carbon source is one or a mixture of polymerized aluminum oxalate, coke, asphalt, carbon black, graphite and solid resin powder.
4. A silica sol bonded iron runner preform as in claim 1 wherein: the metal aluminum and aluminum nitride powder are unified materials with the granularity range of 0.2-0.002 and mm.
5. A method for preparing a silica sol bonded iron runner preform as defined in any one of claims 1 to 4, comprising: the specific manufacturing steps are as follows:
(5) and cooling the prefabricated part to normal temperature, taking out and checking the appearance, and sending the qualified prefabricated part to the field for use.
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