CN118184305A - Wet spray paint for repairing self-healing molten iron ladle and spraying method - Google Patents
Wet spray paint for repairing self-healing molten iron ladle and spraying method Download PDFInfo
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- CN118184305A CN118184305A CN202211604040.8A CN202211604040A CN118184305A CN 118184305 A CN118184305 A CN 118184305A CN 202211604040 A CN202211604040 A CN 202211604040A CN 118184305 A CN118184305 A CN 118184305A
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- molten iron
- wet
- healing
- self
- titanium
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 238000005507 spraying Methods 0.000 title claims abstract description 45
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 29
- 239000007921 spray Substances 0.000 title claims abstract description 20
- 239000003973 paint Substances 0.000 title claims description 14
- 238000000034 method Methods 0.000 claims abstract description 36
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000701 coagulant Substances 0.000 claims abstract description 7
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 7
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 30
- 229910052719 titanium Inorganic materials 0.000 claims description 30
- 239000010936 titanium Substances 0.000 claims description 30
- 229910052593 corundum Inorganic materials 0.000 claims description 27
- 239000010431 corundum Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 13
- 230000000996 additive effect Effects 0.000 claims description 12
- 239000004927 clay Substances 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 11
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 10
- 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 claims description 9
- 229910052863 mullite Inorganic materials 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 7
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 7
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 239000007790 solid phase Substances 0.000 claims description 5
- 239000007767 bonding agent Substances 0.000 claims description 4
- 239000012071 phase Substances 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 3
- BAQNULZQXCKSQW-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[Ti+4].[Ti+4] BAQNULZQXCKSQW-UHFFFAOYSA-N 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 35
- 239000011819 refractory material Substances 0.000 abstract description 8
- 239000011159 matrix material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000011230 binding agent Substances 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 4
- 238000009751 slip forming Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 28
- 239000002994 raw material Substances 0.000 description 9
- 238000003763 carbonization Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- QRNPTSGPQSOPQK-UHFFFAOYSA-N magnesium zirconium Chemical compound [Mg].[Zr] QRNPTSGPQSOPQK-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- Y02P10/20—Recycling
Landscapes
- Ceramic Products (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention discloses a wet-process spray coating for repairing a self-healing type molten iron ladle and a spray coating method. The method comprises the steps of uniformly mixing wet spray coating to obtain a mixture, wherein silica sol is additionally used as a binding agent during spray coating construction operation, magnesium sulfate is used as a coagulant, and a wet spray process is adopted to spray the mixture to a working layer of a ladle. The wet spray coating and the spray coating method have good molten iron and slag corrosion resistance, slag can be adhered to the surface of the working layer to form a slag working layer, direct contact between molten iron and slag and a refractory material matrix is isolated, and after the slag working layer is corroded in long-term service, a new slag working layer can be continuously formed to generate a self-healing effect.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a wet spray coating for repairing a self-healing type ladle and a spray coating method.
Background
The ladle is used as important equipment for iron and steel smelting and is also core equipment for transferring molten iron, and in order to improve the use level of furnace equipment and the safety and the utilization rate of the ladle, the existing refractory materials must be subjected to innovative research, so that the requirement of low carbonization in a long-flow metallurgical process is met. The unshaped refractory material has the characteristics of simple preparation process, strong adaptability, good integrity, convenient mechanized construction and repair, and the like, and is increasingly widely applied to various high-temperature equipment. The ladle repairing material has become an important material for ladle repairing due to the low carbonization technical characteristics, and the ladle repairing material is required to be combined with the process requirement for low carbonization operation, so that the existing material is functionally added, the safety and the service life of the ladle operation are improved, and the core competitiveness of the long-service-life operation and maintenance service of the furnace is continuously improved.
There are three methods for maintaining the ladle of the blast furnace. And firstly, repairing by a bricking method, namely middle repair or major repair. When the method is adopted, the ladle bottom and the brick lining can be replaced at the same time, but workers are required to enter the ladle to build the furnace lining from bottom to top, and the method has the defects of long period, large workload and large material loss; secondly, a smearing repair method is adopted, bricks in a weak area are dug and repaired through the parts or the surfaces of the working layers are smeared, so that the repair of the middle and lower ladle walls of the thickened ladle can be realized, the further damage of a furnace lining is prevented, the materials are generally phosphate bonding/cement bonding repair materials, the bonding performance of the repair materials and a lining brick matrix is poor due to the difference of the thermal expansion coefficients, and the falling off of the repair materials and the matrix material is particularly easy to be caused by the scouring of molten iron vortex; thirdly, the spraying technology is divided into semi-dry spraying and wet spraying, wherein the wet spraying is close to the performance of casting materials in material performance, so that additive lining can be realized, the service life and the cost performance are better, and the method is widely applied.
At present, the repairing material or the wet spraying material is used as the repairing material to be directly attached to the surface of the working layer material of the base ladle, directly contacts with molten iron and slag, is mainly corroded by the molten iron and slag to be thinned, and has generally low service life.
The Chinese patent document CN106365649A discloses a repairing material for a ladle, which adopts part of slide plate waste materials, utilizes the waste materials, saves energy, and simultaneously adds plastic substances, thereby improving the construction strength and the bonding strength of the repairing material and achieving the purpose of prolonging the service life; the Chinese patent document CN107032769A discloses a high-alumina repair material and a preparation method thereof, wherein 67-72 wt% of aluminum-chromium slag particles are used as aggregate, 20-25 wt% of aluminum-chromium slag fine powder, 5-8 wt% of electric smelting magnesium-zirconium sand fine powder and 1-3 wt% of magnesium chloride fine powder are used as matrix materials to prepare the high-alumina repair material. At present, the materials are basically used for repairing, and the service life of the ladle refractory is prolonged only by virtue of the erosion resistance of the materials.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wet-process spray coating for repairing a self-healing type iron ladle and a spray coating method, wherein the wet-process spray coating and the spray coating method have good molten iron and slag corrosion resistance, slag can be adhered to the surface of a working layer to form a slag working layer, direct contact between molten iron and slag and a refractory material matrix is isolated, and after the slag working layer is corroded in long-term service, a new slag working layer can be continuously formed to generate a self-healing effect.
In order to solve the technical problems, the wet spray paint for repairing the self-healing type ladle comprises 35-45 wt% of flint clay or mullite, 20-40 wt% of titanium corundum, 6-12 wt% of silicon carbide, 6-12 wt% of alumina micropowder and 0-6 wt% of pumping additive.
Further, the granularity of flint clay or mullite is 5-1mm; the titanium corundum comprises particles and fine powder, wherein the particle size of the particles is 0.088-1 mm, the particle size of the fine powder is less than 0.088mm, and the volume density is more than or equal to 3.54g/cm 3; the granularity of the silicon carbide is less than 0.088mm; the granularity of the alumina micropowder is less than 2 mu m.
Further, the titanium corundum particles and the fine powder account for 15-25 wt% and 5-15 wt% of the whole spray coating respectively.
Further, titanium in the titanium corundum exists in a titanium oxide titanium phase composition, wherein the titanium oxide content is more than 15wt% and the aluminum oxide content is more than 78%.
Further, the pumping additive is compounded by clay, acidic silica micropowder, a naphthalene water reducer and an explosion-proof fiber additive.
The method is characterized in that the wet-process spray coating is uniformly mixed to obtain a mixed material, 8-12 wt% of silica sol with the solid phase of 25% is additionally used as a bonding agent in the spray construction operation, magnesium sulfate is used as a coagulant, and the mixed material is sprayed to a working layer of a ladle by adopting a wet-process spray coating process.
The wet-process spray paint for repairing the self-healing molten iron ladle and the spray coating method adopt the technical scheme that the wet-process spray paint comprises flint clay or mullite, titanium corundum, silicon carbide, alumina micropowder and pumping additives with certain components. The method comprises the steps of uniformly mixing wet spray coating to obtain a mixture, wherein silica sol is additionally used as a binding agent during spray coating construction operation, magnesium sulfate is used as a coagulant, and a wet spray process is adopted to spray the mixture to a working layer of a ladle. The wet spray coating and the spray coating method have good molten iron and slag corrosion resistance, slag can be adhered to the surface of the working layer to form a slag working layer, direct contact between molten iron and slag and a refractory material matrix is isolated, and after the slag working layer is corroded in long-term service, a new slag working layer can be continuously formed to generate a self-healing effect.
Detailed Description
The wet spray paint for repairing the self-healing molten iron ladle comprises 35-45 wt% of flint clay or mullite, 20-40 wt% of titanium corundum, 6-12 wt% of silicon carbide, 6-12 wt% of alumina micropowder and 0-6 wt% of pumping additive.
Preferably, the granularity of flint clay or mullite is 5-1mm; the titanium corundum comprises particles and fine powder, wherein the particle size of the particles is 0.088-1 mm, the particle size of the fine powder is less than 0.088mm, and the volume density is more than or equal to 3.54g/cm 3; the granularity of the silicon carbide is less than 0.088mm; the granularity of the alumina micropowder is less than 2 mu m.
Preferably, the titanium corundum particles and the fine powder account for 15-25 wt% and 5-15 wt% of the whole spray coating respectively.
Preferably, the titanium in the titanium corundum exists in a titanium oxide titanium phase composition, wherein the titanium oxide content is more than 15wt% and the aluminum oxide content is more than 78%.
Preferably, the pumping additive is compounded by clay, acidic silica micropowder, a naphthalene water reducer and an explosion-proof fiber additive.
The method is characterized in that the wet-process spray coating is uniformly mixed to obtain a mixed material, 8-12 wt% of silica sol with the solid phase of 25% is additionally used as a bonding agent in the spray construction operation, magnesium sulfate is used as a coagulant, and the mixed material is sprayed to a working layer of a ladle by adopting a wet-process spray coating process.
Example 1, the wet spray coating comprises the following components in percentage by weight: flint clay particles accounting for 35-45wt% with a 5-1mm ratio; titanium corundum particles accounting for 15-25wt%; the titanium corundum fine powder accounts for 5-15wt%; the silicon carbide fine powder accounts for 5-10wt%; 3-6wt% of pumping additive, wherein the sum of the weight percentages of all the raw materials is 100%. Firstly, uniformly mixing the spray coating to obtain a mixture; and during construction operation, 8-12 wt% of silica sol with solid phase content of 25% is added as a binding agent, a flow value of 180-220 mm is measured by adopting a table jump method after stirring, construction is performed by adopting a wet spraying process, and magnesium sulfate is used as a coagulant of the spray coating.
The high alumina repairing material prepared in the embodiment is determined by: the volume density after heat treatment at 110 ℃ for 3 hours is 2.38-2.42 g/cm 3; the cold state compressive strength after heat treatment at 110 ℃ for 3 hours is 30-35 MPa.
Example 2, the wet spray coating comprises the following components in percentage by weight: the 60 mullite grains account for 35-45wt% with the 5-1mm ratio; titanium corundum particles accounting for 15-25wt%; the titanium corundum fine powder accounts for 5-15wt%; the silicon carbide fine powder accounts for 5-10wt%; 3-6wt% of pumping additive, wherein the sum of the weight percentages of all the raw materials is 100%. Firstly, uniformly mixing the spray coating to obtain a mixture; and during construction operation, 8-12 wt% of silica sol with solid phase content of 25% is added as a binding agent, a flow value of 180-220 mm is measured by adopting a table jump method after stirring, construction is performed by adopting a wet spraying process, and magnesium sulfate is used as a coagulant of the spray coating.
The high alumina repairing material prepared in the embodiment is determined by: the volume density after heat treatment at 110 ℃ for 3 hours is 2.42-2.48 g/cm 3; the cold state compressive strength after heat treatment at 110 ℃ for 3 hours is 40-45 MPa.
The wet spray coating is prepared from flint clay/mullite, titanium corundum, aluminum oxide, silicon carbide and other fireproof raw materials, wherein silica sol is used as a bonding agent, titanium of the titanium corundum mainly exists in a titanium oxide phase, the content of the titanium oxide exceeds 15wt%, and the content of the aluminum oxide exceeds 78%. The titanium corundum raw material replaces the traditional brown corundum, white corundum or bauxite raw material to prepare the ladle repairing material. When the titanium corundum is used, titanium oxide in the titanium corundum reacts with C of molten iron to generate TiC, tiN and other high-melting-point substances, so that the titanium corundum has good molten iron and slag corrosion resistance, and the generated TiC, tiN and other high-melting-point substances greatly improve the viscosity of slag when contacting with the slag, and the slag is adhered to the surface of a ladle working layer to form a slag working layer. After the slag working layer is corroded in long-term service, titanium-containing components in the spray coating are contacted with molten iron again to generate TiC, tiN and other high-melting-point substances, and a new slag working layer is formed continuously, so that a self-healing effect is generated. The method has the advantages of simple construction process and convenient operation, can prolong the service life of the ladle refractory material, greatly reduce the consumption of ton iron refractory material, simultaneously reduce the heat dissipation loss in the molten iron transferring process by the formation of the slag working layer, improve the arrival temperature of molten iron and meet the low carbonization operation requirement of the ladle.
The invention takes the titanium corundum with the titanium oxide content exceeding 15wt% as the main raw material, obviously reduces the cost of the spray coating for the ladle, does not need complex treatment technology, and has simple process. The traditional raw materials are used as main raw materials, the titanium corundum raw materials capable of generating TiC/TiN in situ in the use process are added, the TiC/TiN is combined with the slag, the viscosity of the slag is improved, the slag is adhered to the surface of the working layer to form a slag working layer, and the slag working layer has a self-healing effect.
Claims (6)
1. A wet spray paint for repairing a self-healing molten iron ladle is characterized in that: the wet spray paint comprises 35-45 wt% of flint clay or mullite, 20-40 wt% of titanium corundum, 6-12 wt% of silicon carbide, 6-12 wt% of alumina micropowder and 0-6 wt% of pumping additive.
2. The wet spray paint for self-healing molten iron ladle repair according to claim 1, wherein: the granularity of flint clay or mullite is 5-1mm; the titanium corundum comprises particles and fine powder, wherein the particle size of the particles is 0.088-1 mm, the particle size of the fine powder is less than 0.088mm, and the volume density is more than or equal to 3.54g/cm 3; the granularity of the silicon carbide is less than 0.088mm; the granularity of the alumina micropowder is less than 2 mu m.
3. The wet spray paint for self-healing molten iron ladle repair according to claim 2, wherein: the titanium corundum particles and the fine powder account for 15-25 wt% and 5-15 wt% of the whole spray coating respectively.
4. The wet spray paint for self-healing molten iron repair according to claim 1, 2 or 3, wherein: titanium in the titanium corundum exists in a titanium oxide titanium phase composition, wherein the titanium oxide content is more than 15wt% and the aluminum oxide content is more than 78%.
5. The wet spray paint for self-healing molten iron ladle repair according to claim 4, wherein: the pumping additive is compounded by clay, acidic silica micropowder, a naphthalene water reducer and an explosion-proof fiber additive.
6. A spray method of the wet spray paint for repairing a self-healing molten iron according to any one of claims 1 to 5, characterized in that: the method comprises the steps of uniformly mixing the wet spraying paint to obtain a mixture, wherein 8-12 wt% of silica sol with the solid phase of 25% is additionally used as a bonding agent in the spraying construction operation, magnesium sulfate is used as a coagulant, and the mixture is sprayed to a working layer of a ladle by adopting a wet spraying process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211604040.8A CN118184305A (en) | 2022-12-14 | 2022-12-14 | Wet spray paint for repairing self-healing molten iron ladle and spraying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211604040.8A CN118184305A (en) | 2022-12-14 | 2022-12-14 | Wet spray paint for repairing self-healing molten iron ladle and spraying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118184305A true CN118184305A (en) | 2024-06-14 |
Family
ID=91404888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211604040.8A Pending CN118184305A (en) | 2022-12-14 | 2022-12-14 | Wet spray paint for repairing self-healing molten iron ladle and spraying method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118184305A (en) |
-
2022
- 2022-12-14 CN CN202211604040.8A patent/CN118184305A/en active Pending
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