CN114031377A - Cement-free combined gunning mix for carbon-free steel ladle and preparation method thereof - Google Patents
Cement-free combined gunning mix for carbon-free steel ladle and preparation method thereof Download PDFInfo
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- CN114031377A CN114031377A CN202111129983.5A CN202111129983A CN114031377A CN 114031377 A CN114031377 A CN 114031377A CN 202111129983 A CN202111129983 A CN 202111129983A CN 114031377 A CN114031377 A CN 114031377A
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- steel ladle
- corundum
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 239000000203 mixture Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 239000007767 bonding agent Substances 0.000 claims abstract description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 66
- 239000010431 corundum Substances 0.000 claims description 65
- 239000011029 spinel Substances 0.000 claims description 49
- 229910052596 spinel Inorganic materials 0.000 claims description 48
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 46
- 239000001095 magnesium carbonate Substances 0.000 claims description 26
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 26
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 26
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 26
- 239000000395 magnesium oxide Substances 0.000 claims description 23
- 239000002994 raw material Substances 0.000 claims description 23
- 239000004014 plasticizer Substances 0.000 claims description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 17
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 12
- 239000010962 carbon steel Substances 0.000 claims description 12
- -1 magnesium aluminate Chemical class 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 10
- 229910052749 magnesium Inorganic materials 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 10
- 229940091250 magnesium supplement Drugs 0.000 claims description 10
- 229920005646 polycarboxylate Polymers 0.000 claims description 8
- 229910052594 sapphire Inorganic materials 0.000 claims description 8
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 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 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920003086 cellulose ether Polymers 0.000 claims description 3
- 235000001055 magnesium Nutrition 0.000 claims description 3
- 229960005336 magnesium citrate Drugs 0.000 claims description 3
- 235000002538 magnesium citrate Nutrition 0.000 claims description 3
- 239000004337 magnesium citrate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 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 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- PLSARIKBYIPYPF-UHFFFAOYSA-H trimagnesium dicitrate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O PLSARIKBYIPYPF-UHFFFAOYSA-H 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 39
- 230000008439 repair process Effects 0.000 abstract description 24
- 238000002844 melting Methods 0.000 abstract description 16
- 230000008018 melting Effects 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 11
- 230000003628 erosive effect Effects 0.000 abstract description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000292 calcium oxide Substances 0.000 abstract description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000009991 scouring Methods 0.000 abstract description 3
- 235000012245 magnesium oxide Nutrition 0.000 description 21
- 239000002245 particle Substances 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 15
- 239000011449 brick Substances 0.000 description 11
- 238000002156 mixing Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000010304 firing Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000010835 comparative analysis Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000011895 specific detection Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052599 brucite Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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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- 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
- 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
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
-
- 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
- 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
- C04B2235/3218—Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol
-
- 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
- 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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- 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
- 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
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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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
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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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/449—Organic acids, e.g. EDTA, citrate, acetate, oxalate
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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
- C04B2235/52—Constituents or additives characterised by their shapes
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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Abstract
The invention discloses a cement-free combined gunning mix for a carbon-free steel ladle and a preparation method thereof2O3The micro powder, the bonding agent, the explosion-proof agent and the plastic agent are mixed. The invention has the beneficial effects that: the magnesium powder is arranged, so that the tackifying property is improved, and the magnesium powder has the advantages of good adhesion, good high-temperature performance and no introduction of carbon impurities and calcium oxide impurities; the cement-free combined gunning material for the carbon-free steel ladle can directly perform gunning repair on the part of the steel ladle with too fast local melting loss and insufficient residual thickness during cold repair, thereby effectively prolonging the service life of the carbon-free steel ladle; the ladle can be subjected to overall gunning lining, and the implementation mode of re-laying carbon-free precast blocks or pouring in a sleeving manner during overhaul is changed; in the using process, the cement-free gunning mix shows excellent molten steel erosion resistance and scouring resistance, so that the refractory consumption of ton steel can be obviously reduced, the labor intensity of workers is reduced, and the economic benefit and the market competitiveness of enterprises are improved.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a cement-free combined gunning material for a carbon-free steel ladle and a preparation method thereof.
Background
A ladle is used as a transfer device in a continuous casting line for receiving molten steel in an open hearth furnace, an electric furnace, or a converter in a steel plant or a foundry to perform a casting operation. With the progress of external refining, short-flow steelmaking and continuous casting technologies and the higher and higher requirements on the quality of high-purity and high-cleanness steel, secondary refining by using a ladle becomes a mainstream process of various large steel mills, which results in the increase of tapping temperature and the prolongation of the residence time of molten steel in the ladle. With the drive of energy conservation, emission reduction and consumption reduction of steel plants, scrap steel is added into a converter and a ladle in each large steel plant in a break-by-break manner so as to improve the yield of steel making. These result in increasingly harsh conditions for use of the ladle and increased melting loss of the ladle bath liner. At present, carbon-free working lining technologies, such as carbon-free precast blocks or carbon-free integral castable, are adopted in steel ladles of domestic large-scale steel mills. The carbon-free technology meets the requirements of high-variety and high-purity steel, but the situation of local melting loss is inevitable in the use process. This requires a repair treatment of the carbonless ladle in order to further extend its service life.
The traditional smearing repair increases the labor intensity of workers and has short service life. The development of the ladle cement-bonded gunning mix is promoted, the service life of the repaired ladle is further prolonged, and the turnover efficiency of the ladle is improved.
The prior art discloses a manufacturing method of cement-free gunning material for a certain carbon-free steel ladle;
1. for example, Chinese patent discloses a steel ladle brick cup thermal-state repairing material and a preparation method thereof (application number: CN 201911299666.0). Aiming at the problems that the air permeable seat and the nozzle seat brick are easy to corrode and damage and the service life is shorter than that of other ladle seat bricks, the invention provides a ladle seat brick thermal-state repairing material which comprises the following raw materials: according to weight percentage, 39-43% of carbon-free ladle brick particles, 19-23% of zirconium corundum particles, 15-20% of white corundum powder, 8-10% of spinel fine powder, 8-10% of alpha aluminum oxide micro powder, 0.5-1% of silicon dust powder, 2-3% of pure calcium aluminate cement, 0.1% of high-efficiency water reducing agent and 0.05-0.1% of explosion-proof fibers.
2. A corundum spinel repair material for a carbon-free steel ladle working lining and a preparation method (CN202110425269.4) thereof are disclosed, wherein the repair material comprises the following components in parts by mass: 30-80 parts of corundum composite material, 15-45 parts of aluminum-magnesium spinel, 2-10 parts of alumina micro powder, 3-8 parts of pure calcium aluminate cement, 1-7 parts of plasticizer, 0.1-0.3 part of water reducing agent and 0.03-0.3 part of explosion-proof fiber.
Although some technical schemes of the repair materials are disclosed in the prior art, the repair materials are poor in tackifying property and not high-temperature resistant, so that the compressive strength and the compressive strength are poor.
Therefore, it is necessary to provide a cement-free gunning mix for a non-carbon steel ladle and a method for preparing the same.
Disclosure of Invention
In view of the above-mentioned disadvantages of the prior art, an object of the present invention is to provide a cement-free gunning mix for a non-carbon steel ladle and a method for preparing the same, which solves the above-mentioned problems.
The cement-free combined gunning mix for the carbon-free steel ladle comprises the following raw materials in parts by weight: 50-70 parts of corundum, 5-20 parts of spinel, 0.2-5 parts of magnesia, 6-20 parts of alpha-Al 2O3 micro powder, 5-15 parts of bonding agent, 0.08-1.5 parts of explosion-proof agent and 0.01-1 part of plastic agent.
The raw materials comprise the following components in parts by weight: 55-65 parts of corundum, 7-16 parts of spinel, 0.5-3 parts of magnesia, 8-17 parts of alpha-Al 2O3 micro powder, 7-12 parts of bonding agent, 0.1-1.0 part of explosion-proof agent and 0.02-0.8 part of plastic agent.
Wherein the corundum comprises 25-35 parts of corundum with the thickness of 1-3 mm and 20-25 parts of corundum with the thickness of 0-1 mm in parts by weight.
Wherein the corundum bag is one or more of tabular corundum, fused white corundum, sub-white corundum, compact corundum and brown corundum.
Wherein the spinel comprises 2-5 parts by weight of 0.045 mm-1 mm spinel and 5-11 parts by weight of 0-0.045 mm spinel; the spinel is one or more of electrofusion spinel and sintering spinel.
The magnesite comprises 0.5-3 parts by weight of 0-0.074 mm magnesite, and the magnesite is one or two of fused magnesite and high-purity magnesite.
Wherein the binding agent is one or more of hydrated alumina, alumina gel, water glass, magnesium citrate, magnesium aluminate and sodium hexametaphosphate.
The explosion-proof agent is composed of one or more of polypropylene fiber, metal Al powder, aluminum lactate or azoamide, wherein the mass ratio of the organic fiber to the metal Al powder to the aluminum lactate is 2: 1: 4.
wherein the plasticizer is one or more of cellulose ether plasticizers, polycarboxylate plasticizers and naphthalene plasticizers.
The preparation method of the cement-free combined gunning mix for the non-carbon steel ladle comprises the step of uniformly mixing the raw materials to obtain the cement-free combined gunning mix for the non-carbon steel ladle.
Compared with the prior art, the invention has the beneficial effects that:
(1) the magnesium powder is arranged, so that the tackifying property is improved, and the magnesium powder has the advantages of good adhesion, good high-temperature performance and no introduction of carbon impurities and calcium oxide impurities; wherein the corundum and the spinel have good high temperature resistance, and the high temperature resistance of the patching material is improved.
(2) The cement-free combined gunning material for the carbon-free steel ladle can directly perform gunning repair on the part of the steel ladle with too fast local melting loss and insufficient residual thickness during cold repair, thereby effectively prolonging the service life of the carbon-free steel ladle; the ladle can be subjected to overall gunning lining, and the implementation mode of re-laying carbon-free precast blocks or pouring in a sleeving manner during overhaul is changed; in the using process, the cement-free gunning mix shows excellent molten steel erosion resistance and scouring resistance, so that the refractory consumption of ton steel can be obviously reduced, the labor intensity of workers is reduced, and the economic benefit and the market competitiveness of enterprises are improved.
(3) The preparation method of the cement-free combined gunning mix can obtain the cement-free combined gunning mix for the carbon-free steel ladle through simple mixing, has simple and easy operation method and is convenient for large-scale production.
Detailed Description
The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.
The cement-free combined gunning mix for the carbon-free steel ladle comprises the following raw materials in parts by weight: 50-70 parts of corundum, 5-20 parts of spinel, 0.2-5 parts of magnesia, 6-20 parts of alpha-Al 2O3 micro powder, 5-15 parts of bonding agent, 0.08-1.5 parts of explosion-proof agent and 0.01-1 part of plastic agent. Wherein the alumina adopts alpha-Al2O3The alpha phase of the micro powder is a close-packed hexagonal structure, is a low-temperature stable phase and has high-temperature-resistant inertia.
The raw materials comprise the following components in parts by weight: 55-65 parts of corundum, 7-16 parts of spinel, 0.5-3 parts of magnesia, 8-17 parts of alpha-Al 2O3 micro powder, 7-12 parts of bonding agent, 0.1-1.0 part of explosion-proof agent and 0.02-0.8 part of plastic agent.
Wherein the corundum comprises 25-35 parts of corundum with the thickness of 1-3 mm and 20-25 parts of corundum with the thickness of 0-1 mm in parts by weight.
Wherein the corundum bag is one or more of tabular corundum, fused white corundum, sub-white corundum, compact corundum and brown corundum; more preferably, the corundum is plate corundum and fused white corundum, and the plate corundum and the fused white corundum are Al2O3The content is more than or equal to 99.5 percent.
Wherein the spinel comprises 2-5 parts by weight of 0.045 mm-1 mm spinel and 5-11 parts by weight of 0-0.045 mm spinel; the spinel is one or more of electrofusion spinel and sintering spinel, and Al of the electrofusion spinel and the sintering spinel2O3The content is more than or equal to 78 percent, and the MgO content is more than or equal to 21 percent.
The magnesite comprises 0.5-3 parts by weight of 0-0.074 mm magnesite, wherein the magnesite is one or two of electric melting magnesite and high-purity magnesite, and the MgO content of the electric melting magnesite and the high-purity magnesite is more than or equal to 97%.
Wherein the binding agent is one or more of hydrated alumina, alumina gel, water glass, magnesium citrate, magnesium aluminate and sodium hexametaphosphate; the mass ratio of the hydrated alumina to the magnesium aluminate is 5-8: 3-6 parts.
The explosion-proof agent is composed of one or more of polypropylene fiber, metal Al powder, aluminum lactate or azoamide, wherein the mass ratio of the organic fiber to the metal Al powder to the aluminum lactate is 2: 1: 4.
wherein the plasticizer is one or more of cellulose ether plasticizers, polycarboxylate plasticizers and naphthalene plasticizers.
The grain diameter and the weight percentage of various particles of the electro-fused white corundum are as follows: the grain diameter is more than or equal to 1 and less than or equal to 3mm and accounts for 10-50 percent; the grain diameter is more than or equal to 0 mm and less than or equal to 1mm, and accounts for 10-50%. The sum of the particle diameters of various particles of the electro-fused white corundum is 100 percent. The plate-shaped corundum comprises various particles with the grain diameters and the weight percentages as follows: the grain diameter is more than or equal to 1 and less than or equal to 3mm and accounts for 10-50 percent; the grain diameter is more than or equal to 0 mm and less than or equal to 1mm, and accounts for 10-50%. The sum of the particle diameters of various particles of the tabular corundum is 100 percent. The grain diameter and the weight percentage of various particles of the electric melting spinel are as follows: the grain diameter is more than or equal to 0 mm and less than or equal to 1mm, and accounts for 10-40%, and the grain diameter is more than or equal to 0.045mm and accounts for 10-60%. The sum of the particle sizes of various particles of the electric melting spinel is 100%. The particle size and the weight percentage of various particles of the sintered spinel are as follows: the grain diameter is more than or equal to 0 mm and less than or equal to 1mm, and accounts for 10-40%, and the grain diameter is more than or equal to 0.045mm and accounts for 10-60%. The sum of the particle sizes of the various particles of the sintered spinel is 100%.
The preparation method of the cement-free combined gunning mix for the non-carbon steel ladle comprises the step of uniformly mixing the raw materials to obtain the cement-free combined gunning mix for the non-carbon steel ladle.
Compared with the prior art, the invention has the beneficial effects that:
(1) the magnesium powder is arranged, so that the tackifying property is improved; the repair material has the advantages of good adhesion and high temperature performance, and carbon impurities and calcium oxide impurities cannot be introduced, wherein corundum and spinel have good high temperature resistance, and the high temperature resistance of the repair material is improved.
(2) The cement-free combined gunning material for the carbon-free steel ladle can directly perform gunning repair on the part of the steel ladle with too fast local melting loss and insufficient residual thickness during cold repair, thereby effectively prolonging the service life of the carbon-free steel ladle; the ladle can be subjected to overall gunning lining, and the implementation mode of re-laying carbon-free precast blocks or pouring in a sleeving manner during overhaul is changed; in the using process, the cement-free gunning mix shows excellent molten steel erosion resistance and scouring resistance, so that the refractory consumption of ton steel can be obviously reduced, the labor intensity of workers is reduced, and the economic benefit and the market competitiveness of enterprises are improved.
(3) The preparation method of the cement-free combined gunning mix can obtain the cement-free combined gunning mix for the carbon-free steel ladle through simple mixing, has simple and easy operation method and is convenient for large-scale production.
The fused magnesite is prepared by melting selected special grade A natural magnesite or high-purity light-burned magnesium particles in an electric arc furnace, and the product has the advantages of high purity, large crystal grains, compact structure, strong slag resistance and good thermal shock stability.
The high-purity magnesite, also called as sintered magnesite, is made up by high-temp. calcination of magnesite, brucite or magnesium hydroxide prepared by reaction of seawater with lime cream, and features high hydration power. The method is mainly used for preparing alkaline refractory materials, such as magnesia bricks and magnesia alumina bricks, and is used for paving the bottom of a steel-making furnace, the crystal size of the periclase is correspondingly increased along with the increase of the calcining temperature and the extension of the heat preservation time, and the hydration resistance and the slag corrosion resistance of the periclase are correspondingly enhanced.
Example 1:
the cement-free combined gunning mix for the non-carbon steel ladle comprises the following components in parts by weight: 30 parts of fused white corundum, 30 parts of tabular corundum, 8 parts of fused spinel, 5 parts of sintered spinel, 1 part of fused magnesia, 2 parts of high-purity magnesia and alpha-Al2O312 parts of micro powder, 5 parts of hydrated alumina, 5 parts of magnesium aluminate, 0.7 part of explosion-proof agent and 0.2 part of polycarboxylate plasticizer.
The preparation process comprises the following steps: weighing the raw materials according to the formula, adding the raw materials into a forced stirrer, and uniformly stirring to obtain the cement-free combined gunning material for the carbon-steel-free ladle.
The physical and chemical indexes of the cement-free gunning mix for the carbon-free steel ladle are detected, and specific detection results are shown in table 1.
As is clear from Table 1, the cement-free bonded gunning material of example 1 has a suitable bulk density and excellent linear change rate after firing, flexural strength and compressive strength at high temperatures.
The cement-free combined gunning material for the carbon-free steel ladle in the embodiment 1 can be used for directly gunning and repairing the part with too fast local melting loss and insufficient residual thickness during cold repair, shows good molten steel erosion resistance and filling resistance in the using process, can obviously reduce the refractory consumption of ton steel, simultaneously reduces the labor intensity of workers, prolongs the service life of the steel ladle, and improves the economic benefit and market competitiveness of enterprises.
Example 2:
the cement-free combined gunning mix for the non-carbon steel ladle comprises the following components in parts by weight: 40 parts of fused white corundum, 25 parts of tabular corundum, 5 parts of fused spinel, 8 parts of sintered spinel, 1 part of fused magnesia, 1.5 parts of high-purity magnesia and alpha-Al2O315 parts of micro powder, 8 parts of hydrated alumina, 3 parts of magnesium aluminate, 0.5 part of explosion-proof agent and 0.5 part of polycarboxylate plasticizer.
The physical and chemical indexes of the cement-free gunning mix for the carbon-free steel ladle are detected, and specific detection results are shown in table 1. As is clear from Table 1, the cement-free bonded gunning material of example 2 has a suitable bulk density and excellent linear change rate after firing, flexural strength and compressive strength at high temperatures.
The cement-free combined gunning material for the carbon-free steel ladle in the embodiment 2 can directly perform gunning repair on the part with too fast local melting loss and insufficient residual thickness during cold repair, shows good molten steel erosion resistance and filling resistance in the using process, can obviously reduce the refractory consumption of ton steel, simultaneously reduces the labor intensity of workers, prolongs the service life of the ladle, and improves the economic benefit and market competitiveness of enterprises.
Example 3:
the cement-free combined gunning mix for the non-carbon steel ladle comprises the following components in parts by weight: 25 parts of electric melting white corundum, 40 parts of tabular corundum, 12 parts of sintering spinel, 0.8 part of electric melting magnesia, 0.5 part of high-purity magnesia, and alpha-Al2O39 parts of micro powder, 4 parts of hydrated alumina, 5 parts of magnesium aluminate, 0.3 part of explosion-proof agent and 0.3 part of polycarboxylate plasticizer.
The preparation process comprises the following steps: weighing the raw materials according to the formula, adding the raw materials into a forced stirrer, and uniformly stirring to obtain the cement-free combined gunning material for the carbon-steel-free ladle.
The physical and chemical indexes of the cement-free gunning mix for the carbon-free steel ladle are detected, and specific detection results are shown in table 1. As is clear from Table 1, the cement-free bonded gunning material of example 3 has a suitable bulk density and excellent linear change rate after firing, flexural strength and compressive strength at high temperatures.
The cement-free combined gunning material for the carbon-free steel ladle in the embodiment 3 can be used for directly gunning and repairing the part with too fast local melting loss and insufficient residual thickness during cold repair, shows good molten steel erosion resistance and filling resistance in the using process, can obviously reduce the refractory consumption of ton steel, simultaneously reduces the labor intensity of workers, prolongs the service life of the ladle, and improves the economic benefit and market competitiveness of enterprises.
Example 4:
the cement-free combined gunning mix for the non-carbon steel ladle comprises the following components in parts by weight: 30 parts of electric white corundum, 27 parts of tabular corundum, 14 parts of electric spinel, 2 parts of high-purity magnesite and alpha-Al2O315 parts of micro powder, 5 parts of hydrated alumina, 7 parts of magnesium aluminate, 0.4 part of explosion-proof agent and 0.2 part of polycarboxylate plasticizer.
The preparation process comprises the following steps: weighing the raw materials according to the formula, adding the raw materials into a forced stirrer, and uniformly stirring to obtain the cement-free combined gunning material for the carbon-steel-free ladle.
The physical and chemical indexes of the cement-free gunning mix for the carbon-free steel ladle are detected, and specific detection results are shown in table 1. As is clear from Table 1, the cement-free bonded gunning material of example 4 has a suitable bulk density and excellent linear change rate after firing, flexural strength and compressive strength at high temperatures.
The cement-free combined gunning material for the carbon-free steel ladle in the embodiment 4 can directly perform gunning repair on the part with too fast local melting loss and insufficient residual thickness during cold repair, shows good molten steel erosion resistance and filling resistance in the using process, can obviously reduce the refractory consumption of ton steel, simultaneously reduces the labor intensity of workers, prolongs the service life of the ladle, and improves the economic benefit and market competitiveness of enterprises.
Comparative example 1. the embodiment of the comparative document 1 (a ladle brick cup hot-state mending material and a preparation method thereof, application number: CN201911299666.0) in the prior art is selected, and the raw material composition comprises: the carbon-free ladle brick comprises, by weight, 40% of a carbon-free ladle brick, 20% of zirconium corundum, 16% of white corundum powder, 9% of spinel fine powder, 9% of alpha aluminum oxide micro powder, 1% of silicon dust powder, 2.5% of pure calcium aluminate cement, 0.1% of a high-efficiency water reducing agent and 0.07% of an explosion-proof fiber, and the carbon-free ladle brick is prepared by weighing the raw materials in parts by weight, and uniformly stirring and mixing the raw materials.
Comparative example 2: selecting a comparison document 2 (a corundum spinel repairing material for a carbon-free steel ladle working lining and a preparation method thereof; application number: CN202110425269.4) in the prior art, mixing the components and the content of the raw materials, uniformly mixing a matrix material (a corundum composite material with the particle size of less than or equal to 0.088mm, an aluminum magnesium spinel with the particle size of less than or equal to 0.088mm, alumina micropowder, pure calcium aluminate cement, a plasticizer, a water reducing agent and explosion-proof fibers) and a water reducing agent and explosion-proof fibers for 2-3 minutes, adding the uniformly mixed matrix material into aggregates (the corundum composite material with the particle size of more than 0.088mm and the aluminum magnesium spinel with the particle size of more than 0.088 mm), stirring for 3-5 minutes, and uniformly mixing. The process of uniformly mixing for 2-3 minutes can effectively reduce the phenomenon of uneven mixing of important raw materials in the repair material, and avoid the adverse effects on the construction performance and the service performance of the product caused by process defects. The produced patching material is packaged by a damp-proof half-ton bag. When the multifunctional trowel is used, 8.0-9.0% of water is added, the mixture is stirred for 5-8 minutes until the state is uniform, the mixture is put into a hopper, and the hopper is thrown by a shovel and then trowelled. And baking the steel ladle after curing for 2-4 hours to prepare the corundum spinel repairing material for the carbon-free steel ladle working lining.
Comparative example 3: the following formula is selected: 30 parts of fused white corundum, 30 parts of tabular corundum, 8 parts of fused spinel, 5 parts of sintered spinel and alpha-Al2O312 parts of micro powder, 5 parts of hydrated alumina, 5 parts of magnesium aluminate, 0.7 part of explosion-proof agent and 0.2 part of polycarboxylate plasticizer, and the repairing material is prepared from the raw materials of the formula.
In comparison experiment 1, the patching material prepared by the patching material formula in the examples 1-4 is selected, and the physical and chemical index results are detected through experiments, wherein the physical and chemical indexes are shown in the following table 1:
TABLE 1 physicochemical indices of cement-free gunning materials of examples 1 to 4
Comparative analysis 1: the combination of the examples 1 to 4 shows that the folding strength and the compression strength of the example 1 are higher than those of the examples 2 to 4 in a high-temperature environment, and the fused magnesia and the high-purity magnesia are arranged in the example 1 and are higher than those of the examples 2 to 4, so that the folding strength and the compression strength of the magnesia and the linear change rate after firing can be improved.
Comparative experiment 2: the patching materials prepared by the patching material formulas in the example 1, the comparative example 2 and the comparative example 3 are selected, and the physical and chemical index results are detected through experiments, wherein the physical and chemical indexes are shown in the table 2:
comparative analysis 2: the combination of example 1, comparative example 2 and comparative example 3 shows that the flexural strength and the compressive strength of example 1 are greater than those of comparative example 1, comparative example 2 and comparative example 3, so that the repair material formula of the invention has good linear change rate after firing, flexural strength and compressive strength compared with the prior art.
Comparative analysis 3: tables 1 and 2 show that the larger the bulk density is, the greater the breaking strength and compressive strength are, and therefore the smaller the particle size of corundum, spinel and magnesite is, the greater the density is, but the smaller the density is, so that the high temperature resistance is affected, and in a reasonable range, on one hand, the bulk density is improved, and on the other hand, the high temperature resistance is also ensured.
Comparative analysis 4: it can be found by combining table 1 and table 2 that the compressive strength and compressive strength of the repair material are higher under the higher temperature condition, so that the function of the magnesia is mainly that the grains of the magnesia gradually grow up at high temperature, the volume is shrunk, the density is increased, and the density is increased, thereby improving the compressive strength and compressive strength.
Comparative analysis 5: as can be seen from example 1 and comparative example 3 in table 1, the fired linear change rate, the breaking strength and the compressive strength of example 1 are all better than those of comparative example 3, and the raw material formulation of comparative example 3 has no magnesite component, and the other components are the same, so that magnesite can improve the fired linear change rate, the breaking strength and the compressive strength of the repair material.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The cement-free combined gunning mix for the carbon-free steel ladle is characterized by comprising the following components in parts by weight: the raw materials comprise the following components in parts by weight: 50-70 parts of corundum, 5-20 parts of spinel, 0.2-5 parts of magnesia and alpha-Al2O36-20 parts of micro powder, 5-15 parts of binding agent, 0.08-1.5 parts of explosion-proof agent and 0.01-1 part of plastic agent.
2. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the raw materials comprise the following components in parts by weight: 55-65 parts of corundum, 7-16 parts of spinel, 0.5-3 parts of magnesia and alpha-Al2O38-17 parts of micro powder, 7-12 parts of bonding agent, 0.1-1.0 part of explosion-proof agent and 0.02-0.8 part of plastic agent.
3. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the corundum comprises 25-35 parts of corundum with the thickness of 1-3 mm and 20-25 parts of corundum with the thickness of 0-1 mm in parts by weight.
4. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the corundum bag is made of one or more of tabular corundum, fused white corundum, sub-white corundum, compact corundum and brown corundum.
5. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the spinel comprises 2-5 parts by weight of 0.045 mm-1 mm spinel and 5-11 parts by weight of 0-0.045 mm spinel; the spinel is one or more of electrofusion spinel and sintering spinel.
6. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the magnesite comprises 0.5-3 parts of 0-0.074 mm magnesite in parts by weight, and the magnesite is one or two of fused magnesite and high-purity magnesite.
7. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the binding agent is one or more of hydrated alumina, alumina gel, water glass, magnesium citrate, magnesium aluminate and sodium hexametaphosphate.
8. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the explosion-proof agent is composed of one or more of polypropylene fiber, metal Al powder, aluminum lactate or azoamide.
9. The cement-free bond gunning mix for a carbonless steel ladle as claimed in claim 1, wherein: the plasticizer is one or more of cellulose ether plasticizers, polycarboxylate plasticizers and naphthalene plasticizers.
10. The method for preparing a cement-free gunning mix for a non-carbon steel ladle according to any one of claims 1 to 9, wherein the raw materials are uniformly mixed to obtain the cement-free gunning mix for a non-carbon steel ladle.
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