CN115010473B - Coil clay for medium-frequency induction furnace and preparation method thereof - Google Patents
Coil clay for medium-frequency induction furnace and preparation method thereof Download PDFInfo
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- CN115010473B CN115010473B CN202210710817.2A CN202210710817A CN115010473B CN 115010473 B CN115010473 B CN 115010473B CN 202210710817 A CN202210710817 A CN 202210710817A CN 115010473 B CN115010473 B CN 115010473B
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- corundum
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- 230000006698 induction Effects 0.000 title claims abstract description 48
- 239000004927 clay Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title description 16
- 239000000843 powder Substances 0.000 claims abstract description 80
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 79
- 239000010431 corundum Substances 0.000 claims abstract description 79
- 239000004568 cement Substances 0.000 claims abstract description 65
- 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 39
- 239000002131 composite material Substances 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 150000004645 aluminates Chemical class 0.000 claims abstract description 19
- 239000000701 coagulant Substances 0.000 claims abstract description 17
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 239000004014 plasticizer Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims description 44
- 238000002156 mixing Methods 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 15
- 102220043159 rs587780996 Human genes 0.000 claims description 11
- 238000011049 filling Methods 0.000 claims description 8
- 239000011505 plaster Substances 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 241000276425 Xiphophorus maculatus Species 0.000 claims description 5
- 239000010427 ball clay Substances 0.000 claims description 5
- 229910052851 sillimanite Inorganic materials 0.000 claims description 5
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 5
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 5
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052850 kyanite Inorganic materials 0.000 claims description 4
- 239000010443 kyanite Substances 0.000 claims description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 4
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 239000002689 soil Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 33
- 239000000853 adhesive Substances 0.000 abstract description 32
- 230000001070 adhesive effect Effects 0.000 abstract description 32
- 239000000463 material Substances 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- 239000002344 surface layer Substances 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000004880 explosion Methods 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 15
- 238000005266 casting Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010422 painting Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound 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
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- 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
- 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
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
- C04B2235/3203—Lithium oxide or oxide-forming salts thereof
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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
- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- 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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- C04B2235/00—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
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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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
- C04B2235/34—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
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention relates to the technical field of fireproof materials, and discloses coil cement for an intermediate frequency induction furnace, which comprises 50-70wt% of corundum, 5-20wt% of composite alumina powder, 15-30wt% of aluminate cement, 3-10wt% of composite expanding agent, 2-8wt% of plasticizer, 0.1-0.5wt% of dispersing agent and 0.01-0.20wt% of coagulant. The invention has the following advantages and effects: the raw materials selected by the method are all manually purified or synthesized materials, the impurity content is low, the refractoriness is high, the high temperature resistance of the coil adhesive cement product can be greatly improved, and once high-temperature molten metal permeates into the surface layer of the coil adhesive cement, the coil adhesive cement product can play an isolated role, so that the coil is protected from explosion accidents caused by metal corrosion, and the use safety of equipment is improved; meanwhile, the source of raw materials is wide, the quality reliability is high, and the quality stability of the coil clay product for the intermediate frequency induction furnace is ensured.
Description
Technical Field
The invention relates to the technical field of fireproof materials, in particular to coil clay for an intermediate frequency induction furnace and a preparation method thereof.
Background
The induction furnace has a series of advantages of quick temperature rise, simple operation, small occupied area, low investment, small environmental pollution and the like, and becomes one of important smelting equipment indispensable in industries such as casting, stainless steel, special metal smelting and the like. Induction coils are one of the main components of induction furnaces, and coil cement is a protective material used to fill the seams and skins between coils, which has several important functions: 1. the coil can resist the permeation of high-temperature liquid metal, and equipment damage and casualties accidents caused by permeation of the coil are avoided; 2. the coil can play a supporting role after filling the coil gaps, and the coil is prevented from deforming when the furnace lining is used and removed; 3. the furnace lining has good heat conduction performance, and can rapidly lead out heat, so that the furnace lining has enough loose layers in the use process, and the safety is improved; 4. has good insulating property and can resist the impact of frequent and high-power current. The coil adhesive cement products are required to have multiple performances, mainly high temperature resistance, high strength, good thermal conductivity and insulativity, and meanwhile, good construction performance, so that the application conditions of induction furnaces of various specifications are met.
The preparation and application of refractory mortar for coreless induction furnaces in documents (sexilong and the like, casting, 2006.55 (5), 528-529) are characterized in that dense fused corundum, activated alumina micropowder and pure aluminate cement are used as raw materials to prepare the refractory mortar, and the main defects are that: the fluidity is poor, the initial setting time is too long, thus influencing the workability, and meanwhile, the cement with low purity is selected, and the liquid phase formed at high temperature is large, so that the high-temperature performance is poor.
In literature (Wu. Research on the preparation of intermediate frequency furnace coil cement from titanium-containing slag. 2011 national institute of unshaped refractory society, 2011, 455-458), a method for preparing coil cement from titanium-containing industrial slag is described, which has the main defects that: industrial slag with high impurity content is selected as a raw material, particularly, the calcium content in the industrial slag is too high, dicalcium silicate can be generated in the use process of the cement, and the transition between different crystalline phases of dicalcium silicate can cause pulverization of the material, so that the high temperature resistance of the material is seriously affected, and the safe use is influenced.
The Chinese patent of the invention of the daub for the intermediate frequency furnace lining and the Chinese patent of the invention of the preparation method of the daub for the intermediate frequency furnace, which are disclosed as CN 104030704A, and CN104030703A, adopt a large amount of ultrafine powder and additives, cannot simultaneously meet the use requirements of manual smearing and pouring construction, and have lower high-temperature strength and are easy to crack during baking due to higher content of the ultrafine powder.
The Chinese patent publication No. CN 105777148A, the coil clay for the medium frequency induction furnace and the preparation method thereof, and the Chinese patent publication No. CN 106278314A, the coil clay for the medium frequency induction furnace and the preparation method thereof, respectively adopt waste molding sand, bauxite, forsterite and other materials as main raw materials, and have the main defects of high impurity content, poor high temperature resistance, low thermal conductivity and poor insulativity.
Disclosure of Invention
The invention aims to provide coil adhesive cement for an intermediate frequency induction furnace and a preparation method thereof, and aims to provide a preparation method of the coil adhesive cement for the multifunctional induction furnace, which has excellent service performance and construction performance, and the coil adhesive cement prepared by the method has high strength, high refractoriness, good heat conductivity and insulativity, and simultaneously combines various construction modes such as manual painting, casting molding and the like, thereby meeting the use requirements of induction furnaces with different specifications.
The technical aim of the invention is realized by the following technical scheme: the coil clay for medium frequency induction furnace includes corundum 50-70wt%, composite alumina powder 5-20wt%, aluminate cement 15-30wt%, composite expanding agent 3-10wt%, plasticizer 2-8wt%, dispersant 0.1-0.5wt% and coagulant 0.01-0.20wt%.
The invention is further provided with: the corundum is one or more of fused white corundum, fused brown corundum and platy corundum, and the fused white corundum and platy corundum are Al 2 O 3 The content is more than or equal to 99 percent, the Al of the fused brown corundum 2 O 3 The content is more than or equal to 95 percent.
The invention is further provided with: the corundum comprises 40-60 wt% of corundum particles and 5-20wt% of corundum fine powder, wherein the corundum particles comprise one or two of 3-1mm corundum particles and 1-0mm corundum particles, and the corundum fine powder comprises one or more of 100-200 mesh corundum fine powder, less than 200 mesh corundum fine powder and less than 325 mesh corundum fine powder.
The invention is further provided with: al of the composite alumina powder 2 O 3 99% or more, the composite alumina powder is formed by mixing alumina powder A with the particle size of D50=4-6 mu m and alumina powder B with the particle size of d50=1-3 mu m, wherein the alumina powder A is prepared by mixing: the mass ratio of the alumina powder B is 1:2-2:1.
The invention is further provided with: al of the aluminate cement 2 O 3 The content is more than or equal to 80 percent.
The invention is further provided with: the composite expanding agent is prepared by mixing two or more of kyanite, sillimanite and quartz powder.
The invention is further provided with: the plasticizer is one or more of expansive soil, ball clay and Guangxi white clay.
The invention is further provided with: the dispersing agent is one or more of sodium tripolyphosphate and sodium hexametaphosphate.
The invention is further provided with: the coagulant is one or more of lithium carbonate, potassium carbonate, calcium carbonate and calcium fluoride.
The coil clay for medium frequency induction furnace is prepared through mixing composite alumina powder 5-20wt%, aluminate cement 15-30wt%, composite expanding agent 3-10wt%, plasticizer 2-8wt% and coagulant 0.01-0.20wt% in a roller mixer for 30 min to obtain micro powder mixture with homogeneous components; then adding the mixture of 50-70wt% corundum particles and micro powder into a forced mixer, slowly mixing for 5 minutes, then rapidly mixing for 10 minutes to obtain a uniformly mixed dry coil clay finished product, and filling the finished product into a paper bag with a moisture-proof plastic inner film for storage.
The beneficial effects of the invention are as follows:
1. the raw materials selected in the specific embodiment are all manually purified or synthesized materials, the impurity content is low, the refractoriness is high, the high temperature resistance of the coil clay product can be greatly improved, and once high-temperature molten metal permeates into the surface layer of the coil clay, the coil clay product can play an isolated role, so that the coil is protected from explosion accidents caused by metal corrosion, and the use safety of equipment is improved; meanwhile, the source of raw materials is wide, the quality reliability is high, and the quality stability of the coil clay product for the intermediate frequency induction furnace is ensured.
2. The specific embodiment selects the corundum with high purity as one of main raw materials, and has the following advantages besides extremely high refractoriness: the wear resistance is good, and the damage to the coil surface layer can be ensured when the furnace lining is repeatedly removed; the heat conduction is excellent, and heat can be quickly transferred out through circulating water in the coil in the using process of the furnace lining material, so that the furnace lining is ensured to have enough loose layers, and the service life of the furnace lining and the safety of equipment are further improved; the coil adhesive has extremely high electricity-saving strength, and can resist ultra-high voltage without breakdown, so that the service life of the coil adhesive can be effectively prolonged.
3. The specific embodiment introduces the composite alumina micropowder, and due to the unique particle size distribution, the excellent fluidity and the adhesiveness of the coil cement product are endowed, the construction performance of the coil cement is improved, meanwhile, the density of the coil cement for the medium frequency induction furnace is improved, the water adding amount required during construction is reduced, and due to the extremely high purity, the high temperature resistance of a matrix is further improved, and the medium and high temperature performance of the coil cement product for the medium frequency induction furnace is improved.
4. In the specific embodiment, aluminate cement produced by an electrofusion method is selected as a binding agent, and can react with water quickly at normal temperature or low temperature to generate binding strength, so that the coil clay product is ensured to have higher demolding strength. The cement product has excellent high-temperature performance due to extremely high purity and extremely low-temperature liquid phase quantity generated after high-temperature heat treatment, and the problems of strength reduction and the like easily occurring when low-grade cement is selected in the prior art are solved, so that the high-temperature service performance of the material is ensured.
5. The specific embodiment selects the composite expanding agent, so that the cement can generate certain expansion at different temperatures, the limitation that a single component can generate expansion only in a specific temperature range is overcome, and meanwhile, the expanding agent is converted into a mullite phase at a high temperature, so that the thermal shock resistance of the cement is improved.
6. According to the specific embodiment, the particle size distribution design is carried out according to the Andreison model, so that the prepared coil cement for the medium-frequency induction furnace has good construction performance, can be used in a manual smearing mode or a casting molding mode, can form a smooth and flat surface after maintenance, and is not easy to crack and fall off in the baking and use processes.
Detailed Description
The technical scheme of the present invention will be clearly and completely described in connection with specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1
The coil adhesive cement for the medium-frequency induction furnace comprises the following components in parts by weight:
15 parts of electro-fused white corundum with the corundum particles of 3-1 mm;
25 parts of electro-fused white corundum with the corundum particles of 1-0 mm;
15 parts of corundum fine powder which is 100-200 meshes of fused brown corundum fine powder;
the composite alumina powder is 5 parts of alumina powder A with the particle size of D50=4-6 mu m and 5 parts of alumina powder B with the particle size of D50=1-3 mu m;
Al 2 O 3 15 parts of aluminate cement with the content of more than or equal to 80 percent;
3 parts of kyanite as a composite expanding agent;
5 parts of plasticizer;
the dispersant is 0.5 part of sodium tripolyphosphate;
the coagulant is 0.01 part of lithium carbonate;
the preparation method of the coil adhesive cement for the medium-frequency induction furnace comprises the following steps:
(1) Mixing corundum fine powder, composite alumina powder, aluminate cement, composite expanding agent, plasticizer, dispersing agent and coagulant, and mixing for 30 minutes in a roller mixer to obtain a micropowder mixture;
(2) Pouring the mixture of corundum particles and micro powder into a forced mixer, slowly mixing for 5 minutes, then rapidly mixing for 10 minutes to obtain a uniformly mixed dry coil clay finished product, and filling the finished product into a paper bag containing a moisture-proof inner film for sealing and storing.
Example 2
The coil adhesive cement for the medium-frequency induction furnace comprises the following components in parts by weight:
45 parts of fused brown corundum with the corundum particles of 1-0 mm;
the corundum fine powder is 10 parts of plate-shaped corundum fine powder with the particle size less than 200;
the composite alumina powder is 4 parts of alumina powder A with the particle size of D50=4-6 mu m and 4 parts of alumina powder B with the particle size of D50=1-3 mu m;
18 parts of aluminate cement;
the composite expanding agent is 8 parts of sillimanite;
the plasticizer is 6 parts of ball clay;
the dispersant is sodium hexametaphosphate 0.1 part;
the coagulant is 0.03 part of potassium carbonate;
the preparation method of the coil adhesive cement for the medium-frequency induction furnace comprises the following steps:
(1) Mixing corundum fine powder, composite alumina powder, aluminate cement, composite expanding agent, plasticizer, dispersing agent and coagulant, and mixing for 30 minutes in a roller mixer to obtain a micropowder mixture;
(2) Pouring the mixture of corundum particles and micro powder into a forced mixer, slowly mixing for 5 minutes, then rapidly mixing for 10 minutes to obtain a uniformly mixed dry coil clay finished product, and filling the finished product into a paper bag containing a moisture-proof inner film for sealing and storing.
Example 3
The coil adhesive cement for the medium-frequency induction furnace comprises the following components in parts by weight:
the corundum particles are 25 parts of 3-1mm electro-fused white corundum particles, and 25 parts of 1-0mm electro-fused white corundum particles;
4 parts of 100-200 mesh plate-shaped corundum fine powder, and less than 4 parts of 200 mesh plate-shaped corundum fine powder;
the composite alumina powder is 10 parts of alumina powder A with d50=4-6 mu m and 5 parts of alumina powder B with the particle size of d50=1-3 mu m;
20 parts of aluminate cement;
the composite expanding agent is 8 parts of quartz powder;
the plasticizer is 6 parts of Guangxi white mud;
the dispersing agent is 0.2 part of sodium tripolyphosphate and 0.3 part of sodium hexametaphosphate;
the coagulant is 0.10 part of calcium carbonate;
the preparation method of the coil adhesive cement for the medium-frequency induction furnace comprises the following steps:
(1) Mixing corundum fine powder, composite alumina powder, aluminate cement, composite expanding agent, plasticizer, dispersing agent and coagulant, and mixing for 30 minutes in a roller mixer to obtain a micropowder mixture;
(2) Pouring the mixture of corundum particles and micro powder into a forced mixer, slowly mixing for 5 minutes, then rapidly mixing for 10 minutes to obtain a uniformly mixed dry coil clay finished product, and filling the finished product into a paper bag containing a moisture-proof inner film for sealing and storing.
Example 4
The coil adhesive cement for the medium-frequency induction furnace comprises the following components in parts by weight:
30 parts of corundum particles, namely 3-1mm platy corundum particles and 30 parts of 1-0mm fused brown corundum particles;
the corundum fine powder is 5 parts of corundum fine powder less than 200 meshes and 5 parts of corundum fine powder less than 325 meshes;
the composite alumina powder is 5 parts of alumina powder A with the particle size of D50=4-6 mu m and 10 parts of alumina powder B with the particle size of D50=1-3 mu m;
25 parts of aluminate cement;
the composite expanding agent is 5 parts of sillimanite and 5 parts of quartz powder;
4 parts of ball clay and 4 parts of Guangxi white mud as plasticizers;
the dispersant is sodium hexametaphosphate 0.5 part;
0.08 part of coagulant calcium fluoride;
the preparation method of the coil adhesive cement for the medium-frequency induction furnace comprises the following steps:
(1) Mixing corundum fine powder, composite alumina powder, aluminate cement, composite expanding agent, plasticizer, dispersing agent and coagulant, and mixing for 30 minutes in a roller mixer to obtain a micropowder mixture;
(2) Pouring the mixture of corundum particles and micro powder into a forced mixer, slowly mixing for 5 minutes, then rapidly mixing for 10 minutes to obtain a uniformly mixed dry coil clay finished product, and filling the finished product into a paper bag containing a moisture-proof inner film for sealing and storing.
Example 5
The coil adhesive cement for the medium-frequency induction furnace comprises the following components in parts by weight:
the corundum particles are 25 parts of 3-1mm electro-fused white corundum particles and 30 parts of 1-0mm electro-fused brown corundum particles;
the corundum fine powder is 10 parts of 100-200 mesh corundum fine powder, 5 parts of < 200 mesh corundum fine powder and 5 parts of < 325 mesh corundum fine powder;
the composite alumina powder is 5 parts of alumina powder A with the particle size of D50=4-6 mu m;
30 parts of aluminate cement;
the composite expanding agent is 4 parts of kyanite and 4 parts of sillimanite;
the plasticizer is 5 parts of ball clay and 5 parts of Guangxi white mud;
the dispersant is 0.1 part of sodium tripolyphosphate;
the coagulant is 0.10 part of lithium carbonate;
the preparation method of the coil adhesive cement for the medium-frequency induction furnace comprises the following steps:
(1) Mixing corundum fine powder, composite alumina powder, aluminate cement, composite expanding agent, plasticizer, dispersing agent and coagulant, and mixing for 30 minutes in a roller mixer to obtain a micropowder mixture;
(2) Pouring the mixture of corundum particles and micro powder into a forced mixer, slowly mixing for 5 minutes, then rapidly mixing for 10 minutes to obtain a uniformly mixed dry coil clay finished product, and filling the finished product into a paper bag containing a moisture-proof inner film for sealing and storing.
The using method of the coil adhesive cement for the medium frequency induction furnace comprises the following steps:
when the coating method is adopted for construction, the finished product of the dry coil adhesive cement is poured into a mixer, clean water accounting for 11-12% of the weight of the adhesive cement is added, the mixture is mixed for about 5 minutes, so that the wet coil adhesive cement is obtained, and then the adhesive cement is filled into gaps and surface layers of the induction coil in a manual coating mode. The painting construction is generally suitable for small induction furnaces (furnaces with a capacity of less than 5 tons) or for applications where local repairs are performed.
When the casting method is adopted for construction, the dry coil adhesive cement finished product is poured into a mixer, clean water accounting for 12-13% of the weight of the adhesive cement is added, the wet coil adhesive cement is obtained after mixing for about 5 minutes, then the wet coil adhesive cement is poured into a gap between an induction coil and a steel mold, the inner wall of the steel mold is knocked by a vibrator, the wet coil adhesive cement generates good fluidity and is automatically filled into the gap of the induction coil under the action of vibration force, and a protective layer is formed on the surface of the coil. And after the coil adhesive cement is fully solidified and hardened, the steel die is removed. The casting construction is generally suitable for large induction furnaces (furnaces with the capacity of more than 5 tons), and compared with a manual painting method, the casting method can not only reduce the labor intensity, but also obtain a smoother and smoother coil plaster layer.
The user can also select a proper construction mode to use the product according to the situation of the site or the use habit.
The coil adhesive cement product prepared by the embodiment is subjected to sample preparation and performance detection according to the relevant national standard, and compared with a certain product sold in the market, the coil adhesive cement product has the following results:
as can be seen from the table, the coil cement for the medium frequency induction furnace has a great improvement on various performance indexes compared with the current commercial products. Firstly, products with two construction methods of painting and pouring are not sold in the market at present; secondly, due to the adoption of high-purity raw materials and special particle size distribution design, the product has excellent construction performance and service performance, for example, the early strength and high-temperature strength after construction are far higher than those of the commercial product; and moreover, the safety of intermediate frequency induction furnace equipment and the service life of furnace lining materials are further improved due to lower heat conductivity. The practical application proves that the invention can be suitable for manufacturing various furnace-type induction coil protective layers, can also be used for local repair, and has the service life which is more than 2 times that of similar products.
Claims (8)
1. The coil clay for the medium frequency induction furnace is characterized in that: comprises 50-70wt% of corundum, 5-20wt% of composite alumina powder, 15-30wt% of aluminate cement, 3-10wt% of composite expanding agent, 2-8wt% of plasticizing agent, 0.1-0.5wt% of dispersing agent and 0.01-0.20wt% of coagulant;
the corundum is one or more of fused white corundum, fused brown corundum and platy corundum, and the fused white corundum and platy corundum are Al 2 O 3 The content is more than or equal to 99 percent, the Al of the fused brown corundum 2 O 3 The content is more than or equal to 95 percent;
al of the composite alumina powder 2 O 3 99% or more, the composite alumina powder is formed by mixing alumina powder A with the particle size of D50=4-6 mu m and alumina powder B with the particle size of D50=1-3 mu m, wherein the alumina powder A is prepared by mixing alumina powder A with the particle size of D50=4-6 mu m: the mass ratio of the alumina powder B is 1:2-2:1.
2. The coil plaster for an intermediate frequency induction furnace according to claim 1, wherein: the corundum comprises 40-60 wt% of corundum particles and 5-20wt% of corundum fine powder, wherein the corundum particles comprise one or two of 3-1mm corundum particles and 1-0mm corundum particles, and the corundum fine powder comprises one or more of 100-200 mesh corundum fine powder, less than 200 mesh corundum fine powder and less than 325 mesh corundum fine powder.
3. The coil plaster for an intermediate frequency induction furnace according to claim 1, wherein: al of the aluminate cement 2 O 3 The content is more than or equal to 80 percent.
4. The coil plaster for an intermediate frequency induction furnace according to claim 1, wherein: the composite expanding agent is prepared by mixing two or more of kyanite, sillimanite and quartz powder.
5. The coil plaster for an intermediate frequency induction furnace according to claim 1, wherein: the plasticizer is one or more of expansive soil, ball clay and Guangxi white clay.
6. The coil plaster for an intermediate frequency induction furnace according to claim 1, wherein: the dispersing agent is one or more of sodium tripolyphosphate and sodium hexametaphosphate.
7. The coil plaster for an intermediate frequency induction furnace according to claim 1, wherein: the coagulant is one or more of lithium carbonate, potassium carbonate, calcium carbonate and calcium fluoride.
8. The method for preparing coil plaster for medium frequency induction furnaces according to any one of claims 1 to 7, characterized in that: firstly, 5-20wt% of composite alumina powder, 15-30wt% of aluminate cement, 3-10wt% of composite expanding agent, 2-8wt% of plasticizing agent and 0.01-0.20wt% of coagulant are mixed in a roller mixer for 30 minutes to obtain a micro powder mixture with uniform components for standby; then adding the mixture of 50-70wt% corundum particles and micro powder into a forced mixer, slowly mixing for 5 minutes, then rapidly mixing for 10 minutes to obtain a uniformly mixed dry coil clay finished product, and filling the finished product into a paper bag with a moisture-proof plastic inner film for storage.
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