CN113845364A - Periclase-forsterite high-temperature spray coating - Google Patents
Periclase-forsterite high-temperature spray coating Download PDFInfo
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- CN113845364A CN113845364A CN202111291187.1A CN202111291187A CN113845364A CN 113845364 A CN113845364 A CN 113845364A CN 202111291187 A CN202111291187 A CN 202111291187A CN 113845364 A CN113845364 A CN 113845364A
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- forsterite
- periclase
- dead
- spray coating
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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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
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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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
-
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
-
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Ceramic Products (AREA)
Abstract
The invention provides a periclase-forsterite high-temperature spray coating which comprises raw materials of dead burned magnesia, metal silicon powder, graphite or coke, has good high-temperature performance, can be used for spraying the lining of a steel furnace at high temperature, prolongs the service life of a kiln, has low resilience rate of raw materials in the spray repair process, has low pollution to molten steel, has high safety and other excellent performances, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a periclase-forsterite high-temperature spray coating.
Background
In high-temperature industrial production, refractory materials are indispensable supporting materials, particularly, in the steel-making process, various kilns including high-temperature kilns such as steel ladles, converters, tundishes and the like can have the phenomena of inner lining peeling and damage in different degrees in the production process, particularly, in the steel-making converter, the feeding side, the furnace bottom and the steel tapping side of the converter are generally maintained by using large-surface hot patching materials at present, but a slag line and a trunnion on the side surface of the converter are difficult to maintain. Therefore, it is necessary to develop a hot repair material for a slag line and a trunnion portion on the side of a steel converter.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a periclase-forsterite high-temperature spray coating. The spray coating adopts dead burned magnesia, metal silicon powder, graphite or coke as main raw materials, not only reduces the cost, but also accords with national resources and environmental protection policies, develops the spray coating suitable for repairing the steelmaking high-temperature furnace, has the characteristics of no pollution to molten steel, low rebound rate, high safety, good high-temperature service performance and the like, and has good economic benefit and social benefit.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides a periclase-forsterite high-temperature spray coating which is mainly composed of 75-85% of dead burnt magnesia, 8-12% of metal silicon powder and 0-10% of graphite or coke by mass percentage. The purity of the metal silicon powder is more than 96 percent, and the granularity of the metal silicon powder is less than or equal to 0.044 mm.
The mass percentage content of MgO in the dead burned magnesia is more than or equal to 92 percent; the content of the dead burnt magnesia is 20-45% of dead burnt magnesia with the particle size of 0.8-0.3mm, 15-30% of dead burnt magnesia with the particle size of 0.3-0.088mm and 20-40% of dead burnt magnesia with the particle size of less than 0.088 mm.
The carbon content of the coke is 85-90%, and the granularity is less than 0.088 mm; the graphite is a reprocessed product of waste graphite products, and the granularity is less than 0.088 mm.
The periclase-forsterite high-temperature spray paint is sprayed into the furnace through a coaxial double-channel spray pipe; wherein the inner tube carries spray paint and oxygen, and the outer tube carries cooling air.
The coaxial double-channel spray pipe is characterized in that the inner pipe is made of plain carbon steel and can freely stretch and retract; the outer pipe is made of heat-resistant steel, and the head part of the outer pipe is provided with a side door for discharging cooling air to the free space in the furnace or an L-shaped pipe for discharging the cooling air backwards along the axis of the spray gun in the opposite direction.
The invention has the following positive beneficial effects:
in the technical scheme of the invention, the periclase-forsterite high-temperature spray coating adopts dead burnt magnesia with the particle size not more than 0.8mm and metal silicon powder with the particle size not more than 0.044mm, so that the spray coating has good physical property and high-temperature use property, the rebound rate is low and the safety is high in the high-temperature spray repair process, and the high-temperature use property of the lining after spray repair is good.
In the technical scheme of the invention, the periclase-forsterite high-temperature spray coating adopts the metal silicon powder with the purity of more than 96 percent and the granularity of less than or equal to 0.044mm, because the silicon is basically not oxidized below 950 ℃ in the air, the safety in the spray repair construction process is very high, and the silicon dioxide is a common component in refractory materials and furnace slag, and because the introduction of impurities and harmful substances can not be caused to the use environment.
In the technical scheme of the invention, the high-temperature periclase-forsterite spray coating is introduced with the dead burnt magnesia and the metal silica powder, and the forsterite is generated after high-temperature combustion, has good bonding property and certain slag corrosion resistance, and can ensure the service life of the repair material.
In the technical scheme of the invention, a small amount of graphite or coke is introduced into the periclase-forsterite high-temperature spray coating as a heating assistant, so that the doping amount of metal silicon is reduced, the melting loss in a spray material lining body is reduced, and the service life of the spray material lining body is prolonged.
In the technical scheme of the invention, the double-channel air-cooled spray gun is adopted, and graphite with an ignition point of over 700 ℃ is adopted as the alternative fuel, so that the problem that the slag resistance of a furnace lining is influenced by the fact that a metal silicon heating agent is singly used to enter excessive silicon dioxide is solved; but also solves the problems of easy tempering and blasting, poor safety and the like when the anthracite is used as fuel.
In the technical scheme of the invention, the inner pipe of the air-cooled spray gun is communicated with spray paint and oxygen, and the outer pipe is communicated with cooling air. Wherein, the inner pipe can freely stretch out and draw back, and the side door that the outer tube head was opened has the exhaust air is equipped with L type pipe and discharges the cooling gas backward along the spray gun axis is reverse. Since the cooling air is discharged into the free space in the furnace from the position 10-30mm behind the flame of the spray gun at an angle vertical to the flame, the spraying of the furnace lining is not influenced.
In the technical scheme of the invention, coke is used as a graphite substitute for the occasions with robot site construction, and the problems of high graphite price and low graphite source are solved.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The periclase-forsterite high-temperature spray coating in the following embodiment comprises the following raw materials in percentage by mass: 20-45% of dead burned magnesia with the granularity of 0.8-0.3mm, 15-30% of dead burned magnesia with the granularity of 0.3-0.088mm and 20-40% of dead burned magnesia with the granularity of less than 0.088mm are adopted; 8-12% of metal silicon powder with the granularity of less than or equal to 0.044 mm; 0-10% of graphite or coke with the granularity less than 0.088 mm.
Example 1
The invention relates to a periclase-forsterite high-temperature spray coating which comprises the following raw materials in percentage by mass: adopting 36 percent of dead burned magnesia with the granularity of 0.8-0.3mm, 20 percent of dead burned magnesia with the granularity of 0.3-0.088mm and 26 percent of dead burned magnesia with the granularity of less than 0.088 mm; 8 percent of metal silicon powder with the granularity of less than or equal to 0.044 mm; 10% of graphite or coke with the particle size less than 0.088 mm.
Example 2
The invention relates to a periclase-forsterite high-temperature spray coating which comprises the following raw materials in percentage by mass: 30 percent of dead burned magnesia with the granularity of 0.8-0.3mm, 18 percent of dead burned magnesia with the granularity of 0.3-0.088mm and 33 percent of dead burned magnesia with the granularity of less than 0.088mm are adopted; 11 percent of metal silicon powder with the granularity of less than or equal to 0.044 mm; 8 percent of graphite or coke with the particle size of less than 0.088 mm.
Example 3
The invention relates to a periclase-forsterite high-temperature spray coating which comprises the following raw materials in percentage by mass: adopting 28 percent of dead burned magnesia with the granularity of 0.8-0.3mm, 27 percent of dead burned magnesia with the granularity of 0.3-0.088mm and 32 percent of dead burned magnesia with the granularity of less than 0.088 mm; 9 percent of metal silicon powder with the granularity of less than or equal to 0.044 mm; 4 percent of graphite or coke with the granularity of less than 0.088 mm.
Example 4
The invention relates to a periclase-forsterite high-temperature spray coating which comprises the following raw materials in percentage by mass: adopting 34% of dead burnt magnesia with the granularity of 0.8-0.3mm, 20% of dead burnt magnesia with the granularity of 0.3-0.088mm and 30% of dead burnt magnesia with the granularity of less than 0.088 mm; 10 percent of metal silicon powder with the granularity of less than or equal to 0.044 mm; 6 percent of graphite or coke with the granularity of less than 0.088 mm.
Example 5
The invention relates to a periclase-forsterite high-temperature spray coating which comprises the following raw materials in percentage by mass: 40 percent of dead burned magnesia with the granularity of 0.8-0.3mm, 25 percent of dead burned magnesia with the granularity of 0.3-0.088mm and 21 percent of dead burned magnesia with the granularity of less than 0.088mm are adopted; 12 percent of metal silicon powder with the granularity of less than or equal to 0.044 mm; 2 percent of graphite or coke with the granularity of less than 0.088 mm.
The data for the performance measurements of the products prepared using examples 1, 2, 3, 4 and 5 of the present invention are detailed in table 1.
TABLE 1 relevant Performance test data for products prepared according to the invention in examples 1, 2, 3, 4 and 5
| Index (I) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Spray repair bond rupture strength (MPa) | 13.8 | 14.4 | 14.9 | 14.6 | 15.1 |
| Normal temperature compressive strength (MPa) | 75.82 | 80.1 | 87.34 | 83.4 | 89.2 |
| Rebound Rate (%) | 23.4 | 22.6 | 22.8 | 22.3 | 21.8 |
| Refractoriness under load (. degree.C.) | ＞1700 | ＞1700 | ＞1700 | ＞1700 | ＞1700 |
As shown in Table 1, the periclase-forsterite high-temperature spray coating which is researched and developed has good high-temperature performance and is suitable for repairing a steelmaking high-temperature furnace has the characteristics of no pollution to molten steel, low rebound resilience, high safety, good high-temperature service performance and the like, and has good economic benefit and social benefit.
Claims (5)
1. A periclase-forsterite high-temperature spray coating is characterized in that: the periclase-forsterite high-temperature spray coating mainly comprises 75-85% of dead-burned magnesia, 8-12% of metal silicon powder and 0-10% of graphite or coke by mass percentage; the purity of the metal silicon powder is more than 96 percent, and the granularity of the metal silicon powder is less than or equal to 0.044 mm.
2. The periclase-forsterite high-temperature spray coating as claimed in claim 1, wherein the content of MgO in the dead-burned magnesite is not less than 92% by mass; the dead-burned magnesia comprises, by mass, 20-45% of dead-burned magnesia with the particle size of 0.8-0.3mm, 15-30% of dead-burned magnesia with the particle size of 0.3-0.088mm, and 20-40% of dead-burned magnesia with the particle size of less than 0.088 mm.
3. The periclase-forsterite high-temperature spray coating as claimed in claim 1, wherein the carbon content of the coke is 85-90%, and the particle size is < 0.088 mm; the graphite is made of waste graphite products, and the granularity is less than 0.088 mm.
4. The periclase-forsterite high temperature spray coating of claim 1, wherein the coating is injected into the furnace by a coaxial dual channel lance; wherein the inner tube carries spray paint and oxygen, and the outer tube carries cooling air.
5. The coaxial dual channel lance defined in claim 4 wherein the inner tube is made of plain carbon steel and is freely retractable; the outer pipe is made of heat-resistant steel, and the head part of the outer pipe is provided with a side door for discharging cooling air to the free space in the furnace or an L-shaped pipe for discharging the cooling air backwards along the axis of the spray gun in the opposite direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111291187.1A CN113845364A (en) | 2021-11-05 | 2021-11-05 | Periclase-forsterite high-temperature spray coating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111291187.1A CN113845364A (en) | 2021-11-05 | 2021-11-05 | Periclase-forsterite high-temperature spray coating |
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| CN113845364A true CN113845364A (en) | 2021-12-28 |
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| CN202111291187.1A Pending CN113845364A (en) | 2021-11-05 | 2021-11-05 | Periclase-forsterite high-temperature spray coating |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1272845A (en) * | 1969-03-12 | 1972-05-03 | Foseco Int | Magnesia-containing refractory dressings |
| US5204298A (en) * | 1990-11-28 | 1993-04-20 | Harima Ceramic Co., Ltd. | Basic monolithic refractories |
| CN101328070A (en) * | 2008-07-10 | 2008-12-24 | 武汉科技大学 | Forsterite-C-contained MgO-SiC-C fire-resistant material and preparation thereof |
| CN102584282A (en) * | 2012-01-19 | 2012-07-18 | 北京炜润达冶金材料有限公司 | Thermal-state mending material taking forsterite as raw material for converters and preparation method thereof |
| CN106977183A (en) * | 2017-05-03 | 2017-07-25 | 河南瑞泰耐火材料科技有限公司 | The magnesia soldering material of high temperature kiln hot repair |
| CN107108369A (en) * | 2014-12-22 | 2017-08-29 | 耐火材料控股有限公司 | Refractory product and its application |
| CN112552029A (en) * | 2020-11-30 | 2021-03-26 | 中国地质大学（北京） | Method for preparing converter hot-state repairing material by using used re-fired magnesia bricks |
-
2021
- 2021-11-05 CN CN202111291187.1A patent/CN113845364A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1272845A (en) * | 1969-03-12 | 1972-05-03 | Foseco Int | Magnesia-containing refractory dressings |
| US5204298A (en) * | 1990-11-28 | 1993-04-20 | Harima Ceramic Co., Ltd. | Basic monolithic refractories |
| CN101328070A (en) * | 2008-07-10 | 2008-12-24 | 武汉科技大学 | Forsterite-C-contained MgO-SiC-C fire-resistant material and preparation thereof |
| CN102584282A (en) * | 2012-01-19 | 2012-07-18 | 北京炜润达冶金材料有限公司 | Thermal-state mending material taking forsterite as raw material for converters and preparation method thereof |
| CN107108369A (en) * | 2014-12-22 | 2017-08-29 | 耐火材料控股有限公司 | Refractory product and its application |
| CN106977183A (en) * | 2017-05-03 | 2017-07-25 | 河南瑞泰耐火材料科技有限公司 | The magnesia soldering material of high temperature kiln hot repair |
| CN112552029A (en) * | 2020-11-30 | 2021-03-26 | 中国地质大学（北京） | Method for preparing converter hot-state repairing material by using used re-fired magnesia bricks |
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