CN113357916A - Magnesium-calcium refractory brick with reinforced protective layer and preparation method thereof - Google Patents
Magnesium-calcium refractory brick with reinforced protective layer and preparation method thereof Download PDFInfo
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- CN113357916A CN113357916A CN202110594493.6A CN202110594493A CN113357916A CN 113357916 A CN113357916 A CN 113357916A CN 202110594493 A CN202110594493 A CN 202110594493A CN 113357916 A CN113357916 A CN 113357916A
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- magnesium
- calcium
- refractory brick
- refractory
- mesh cloth
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/105—Ceramic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
- B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a magnesium-calcium refractory brick with a reinforced protective layer and a preparation method thereof.A refractory fiber mesh cloth is pasted on the outer layer of the magnesium-calcium refractory brick, and surface treatment is carried out by a waterproof coating material, so that the adhesion effect of the waterproof coating material is good, and the magnesium-calcium refractory brick can be effectively prevented from being hydrated in the storage and transportation processes; after the magnesium-calcium refractory brick is applied to a high-temperature environment, the refractory fiber mesh cloth forms a uniform and compact protective layer on the outer layer of the magnesium-calcium refractory brick, so that the magnesium-calcium refractory brick is prevented from being locally peeled off after being subjected to rapid cooling and rapid heating to generate cracks in the using process.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a magnesium-calcium refractory brick with a reinforced protective layer and a preparation method thereof.
Background
With the continuous progress of steel smelting technology, the quality of steel products is continuously improved, and the requirements of clean steel and high-quality steel are increased. At present, continuous casting steelmaking technology, especially external refining technology, is generally adopted in China, and the quality requirement on refractory materials is higher and higher. Except for the requirement that the refractory material can bear various harsh use conditions, the refractory material can not pollute molten steel, and the magnesium-calcium refractory material shows incomparable excellent characteristics of other refractory materials and is further and widely developed.
The magnesium-calcium refractory brick has the following advantages: (1) the unique advantage of the magnesium-calcium refractory material is that the magnesium-calcium refractory material is superior to other refractory materials, and the reason that the magnesium-calcium refractory material can purify molten steel is that calcium oxide contained in the magnesium-calcium refractory material can adsorb S, P and other impurities in the molten steel. (2) The magnesium-calcium refractory material has high erosion resistance in an alkaline environment, and calcium oxide can react with silicon dioxide in slag to form dicalcium silicate in a high-temperature environment, so that a high-melting-point protective film is formed on the surface of a brick body to prevent further erosion of the slag. (3) The raw material reserves of the magnesium-calcium series refractory materials are rich, the main raw material for producing the magnesium-calcium series refractory materials at home at present is artificially synthesized magnesium-calcium sand, the artificially synthesized magnesium-calcium sand can be prepared by calcining dolomite at high temperature, the reserves of the dolomite are rich in China, the exploitation difficulty is low, and therefore the reserves of the raw materials of the magnesium-calcium series refractory materials are rich. (4) The magnesium-calcium refractory material does not cause pollution to the surrounding environment in the production and use processes, and has wider application prospect than the magnesium-chromium refractory material.
At present, the biggest problem of the magnesium-calcium refractory is the easy hydration of CaO, including the hydration in production, the hydration in storage and transportation and the hydration in use. It can be said that at present, no synthetic magnesia-calcium sand completely resisting hydration exists, the magnesia-calcium sand and products thereof can not be stored and transported for a long time, and the problem of damage caused by hydration exists more or less in the storage and transportation process. The hydration problem must be solved for the vigorous development and application of the magnesium-calcium refractory bricks.
At present, the method for researching the water resistance of the magnesium-calcium refractory brick at home and abroad roughly comprises the following steps: (1) surface treatment, such as 1) treating the magnesia-calcium sand with phosphoric acid to generate phosphate compounds on the sand surface to cover the surface, isolate air and play a role in preventing water. 2) By usingThe organosilicon solution with a certain concentration wets the surface of the magnesia-calcium sand, and then the magnesia-calcium sand is dried to form a covering layer on the sand surface, thereby playing a role in preventing water. 3) CO2 and water vapor pass through the surfaces of the magnesia-calcium sand and the magnesia-calcium brick to form a carbonate compound coating layer, thereby playing a role in preventing water. 4) A layer of protective films such as anhydrous organic matters, dehydrated asphalt, anhydrous resin and the like are sprayed on the surface of the magnesia-calcium brick, so that the surface of the brick is not contacted with the atmosphere, and the waterproof effect is achieved. (2) An additive. In the production of the magnesite-calcia, small amounts of additives, e.g. BaO, SrO, Al, are added2O3、B2O3、YaO3、SiO2、TiO2、ZrO2、CaF2Rare earth oxides and composites, and the like. These additives act with CaO, or generate low-melting-point substances, or generate solid solutions, improve the microstructure, promote sintering, and play a role in preventing hydration. (3) And (3) sintering. High-temperature sintering or two-step sintering to grow CaO crystal grains, fully sintering, densifying, reducing grain boundary area and playing a role in waterproofing. (4) And (7) sealing and packaging. The product is packaged manually, thermoplastically, vacuumized and the like, so that the surface of the product is not contacted with the atmosphere as much as possible, and the waterproof effect is achieved. (5) And (5) controlling the production process. The hydration of the magnesia-calcium sand or the green brick is reduced as much as possible from each link of the material production process, and the waterproof effect is achieved if high-density raw materials, brick material preheating, anhydrous bonding agents, reasonable particle size distribution, light-burned oil immersion, wax immersion and the like are selected.
The above various waterproof methods can reduce the hydration problem of the magnesium-calcium refractory material to different degrees, and currently, an additive method, vacuum packaging or wax dipping treatment is generally adopted.
Disclosure of Invention
The invention provides a magnesium-calcium refractory brick with a reinforced protective layer and a preparation method thereof, wherein the outer layer of the magnesium-calcium refractory brick is pasted with refractory fiber gridding cloth, and surface treatment is carried out through a waterproof coating material, so that the adhesion effect of the waterproof coating material is good, and the magnesium-calcium refractory brick can be effectively prevented from being hydrated in the storage and transportation processes; after the magnesium-calcium refractory brick is applied to a high-temperature environment, the refractory fiber mesh cloth forms a uniform and compact protective layer on the outer layer of the magnesium-calcium refractory brick, so that the magnesium-calcium refractory brick is prevented from being locally peeled off after being subjected to rapid cooling and rapid heating to generate cracks in the using process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnesium-calcium refractory brick with a reinforced protective layer comprises a magnesium-calcium refractory brick, refractory fiber mesh cloth and a waterproof coating material; the outer side of the magnesium-calcium refractory brick is provided with refractory fiber gridding cloth; and waterproof coating materials are coated in the grids of the fire-resistant fiber grid cloth and on the outer side of the fire-resistant fiber grid cloth.
The refractory fiber gridding cloth is made of alumina ceramic refractory fibers.
1-6% of ThO is added into the alumina ceramic refractory fiber according to the mass ratio2。
The waterproof coating material is a coating material containing more than one of paraffin, silica sol, polyethylene wax, polytetrafluoroethylene and polystyrene.
The refractory fiber mesh cloth is bonded with the outer wall of the magnesium-calcium refractory brick through a high-temperature resistant adhesive.
The preparation method of the magnesium-calcium refractory brick comprises the following steps:
1) cutting refractory fiber mesh cloth according to the shape and the size of the magnesium-calcium refractory brick;
2) preparing a waterproof coating material;
3) immediately moving the magnesium-calcium refractory brick to a dry environment for storage after the preparation of the magnesium-calcium refractory brick is finished, and taking finished product protection measures; performing waterproof surface treatment in dry environment, comprising step 4) and step 5)
4) Coating a high-temperature-resistant binder on the outer wall of the magnesium-calcium refractory brick, and sticking the cut refractory fiber mesh cloth on the corresponding outer wall;
5) and brushing a waterproof coating material on the outer side of the magnesium-calcium refractory brick pasted with the refractory fiber mesh cloth to ensure that the waterproof coating material completely fills the meshes of the refractory fiber mesh cloth, and arranging a coating layer with the thickness of 0.2-1 mm on the outer side of the refractory fiber mesh cloth.
In the step 4), after the outer wall of the magnesium-calcium refractory brick is completely pasted with the refractory fiber mesh cloth, the magnesium-calcium refractory brick is presintered at the temperature of 500-800 ℃, and then the step 5) is carried out.
Compared with the prior art, the invention has the beneficial effects that:
1) the outer layer of the magnesium-calcium refractory brick is pasted with the refractory fiber mesh cloth, and surface treatment is carried out through the waterproof coating material, so that the adhesion effect of the waterproof coating material is good, and the magnesium-calcium refractory brick can be effectively prevented from being hydrated in the storage and transportation processes;
2) after the magnesium-calcium refractory brick is applied to a high-temperature environment, the refractory fiber mesh cloth forms a uniform and compact protective layer on the outer layer of the magnesium-calcium refractory brick, so that the magnesium-calcium refractory brick is prevented from being locally peeled off after being subjected to rapid cooling and rapid heating to generate cracks in the using process.
Detailed Description
The invention relates to a magnesium-calcium refractory brick with a reinforced protective layer, which comprises a magnesium-calcium refractory brick, refractory fiber mesh cloth and a waterproof coating material; the outer side of the magnesium-calcium refractory brick is provided with refractory fiber gridding cloth; and waterproof coating materials are coated in the grids of the fire-resistant fiber grid cloth and on the outer side of the fire-resistant fiber grid cloth.
The refractory fiber gridding cloth is made of alumina ceramic refractory fibers.
1-6% of ThO is added into the alumina ceramic refractory fiber according to the mass ratio2。
The waterproof coating material is a coating material containing more than one of paraffin, silica sol, polyethylene wax, polytetrafluoroethylene and polystyrene.
The refractory fiber mesh cloth is bonded with the outer wall of the magnesium-calcium refractory brick through a high-temperature resistant adhesive.
The invention relates to a preparation method of a magnesium-calcium refractory brick, which comprises the following steps:
1) cutting refractory fiber mesh cloth according to the shape and the size of the magnesium-calcium refractory brick;
2) preparing a waterproof coating material;
3) immediately moving the magnesium-calcium refractory brick to a dry environment for storage after the preparation of the magnesium-calcium refractory brick is finished, and taking finished product protection measures; performing waterproof surface treatment in dry environment, comprising step 4) and step 5)
4) Coating a high-temperature-resistant binder on the outer wall of the magnesium-calcium refractory brick, and sticking the cut refractory fiber mesh cloth on the corresponding outer wall;
5) and brushing a waterproof coating material on the outer side of the magnesium-calcium refractory brick pasted with the refractory fiber mesh cloth to ensure that the waterproof coating material completely fills the meshes of the refractory fiber mesh cloth, and arranging a coating layer with the thickness of 0.2-1 mm on the outer side of the refractory fiber mesh cloth.
In the step 4), after the outer wall of the magnesium-calcium refractory brick is completely pasted with the refractory fiber mesh cloth, the magnesium-calcium refractory brick is presintered at the temperature of 500-800 ℃, and then the step 5) is carried out.
According to the magnesium-calcium refractory brick with the reinforced protective layer, the protective layer is arranged on the outer side of the conventional magnesium-calcium refractory brick, so that the magnesium-calcium refractory brick can play a waterproof role in the storage and transportation processes; after the magnesium-calcium refractory brick is applied to a specific production environment, the outer layer of refractory fiber mesh cloth can play a role in enhancing and preventing the magnesium-calcium refractory brick from cracking, and meanwhile, the advantages of the magnesium-calcium refractory brick are not influenced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The magnesium-calcium refractory brick with the reinforced protective layer is characterized by comprising a magnesium-calcium refractory brick, refractory fiber mesh cloth and a waterproof coating material; the outer side of the magnesium-calcium refractory brick is provided with refractory fiber gridding cloth; and waterproof coating materials are coated in the grids of the fire-resistant fiber grid cloth and on the outer side of the fire-resistant fiber grid cloth.
2. The magnesium-calcium refractory brick as claimed in claim 1, wherein the refractory fiber mesh cloth is made of alumina ceramic refractory fibers.
3. According to claim2, the magnesia-calcium refractory brick is characterized in that 1-6% of ThO is added into the alumina ceramic refractory fiber according to the mass ratio2。
4. The magnesium-calcium refractory brick as claimed in claim 1, wherein the waterproof coating material is a coating material containing more than one of paraffin, silica sol, polyethylene wax, polytetrafluoroethylene and polystyrene.
5. The magnesium-calcium refractory brick as claimed in claim 1, wherein the refractory fiber mesh cloth is bonded with the outer wall of the magnesium-calcium refractory brick through a high temperature resistant binder.
6. The method for preparing the magnesium-calcium refractory brick as claimed in claim 1, which comprises the following steps:
1) cutting refractory fiber mesh cloth according to the shape and the size of the magnesium-calcium refractory brick;
2) preparing a waterproof coating material;
3) immediately moving the magnesium-calcium refractory brick to a dry environment for storage after the preparation of the magnesium-calcium refractory brick is finished, and taking finished product protection measures; performing waterproof surface treatment in dry environment, comprising step 4) and step 5)
4) Coating a high-temperature-resistant binder on the outer wall of the magnesium-calcium refractory brick, and sticking the cut refractory fiber mesh cloth on the corresponding outer wall;
5) and brushing a waterproof coating material on the outer side of the magnesium-calcium refractory brick pasted with the refractory fiber mesh cloth to ensure that the waterproof coating material completely fills the meshes of the refractory fiber mesh cloth, and arranging a coating layer with the thickness of 0.2-1 mm on the outer side of the refractory fiber mesh cloth.
7. The method for preparing the magnesium-calcium refractory brick as claimed in claim 6, wherein in the step 4), after the refractory fiber mesh cloth is adhered to the whole outer wall of the magnesium-calcium refractory brick, the magnesium-calcium refractory brick is pre-sintered at the temperature of 500-800 ℃, and then the step 5) is carried out.
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| CN202110594493.6A CN113357916B (en) | 2021-05-28 | 2021-05-28 | Magnesium-calcium refractory brick with reinforced protective layer and preparation method thereof |
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| CN202110594493.6A CN113357916B (en) | 2021-05-28 | 2021-05-28 | Magnesium-calcium refractory brick with reinforced protective layer and preparation method thereof |
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| CN113357916B CN113357916B (en) | 2023-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114230370A (en) * | 2022-01-20 | 2022-03-25 | 海城利尔麦格西塔材料有限公司 | Waterproof method for unburned magnesium-calcium-carbon brick |
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| CN107540390A (en) * | 2017-08-08 | 2018-01-05 | 海城利尔麦格西塔材料有限公司 | A kind of electric smelting magnesia-calcium brick |
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2021
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Patent Citations (9)
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| CN101439977A (en) * | 2008-12-25 | 2009-05-27 | 大石桥市金龙耐火材料有限公司 | High-calcium magnesia-calcium-carbon brick and manufacturing method thereof |
| CN102531677A (en) * | 2012-02-24 | 2012-07-04 | 辽宁科技大学 | Waterproof method for unburned magnesium calcium carbon brick |
| CN203382673U (en) * | 2013-07-18 | 2014-01-08 | 辽宁青花耐火材料股份有限公司 | Process device for automatically soaking magnesia-calcium-carbon bricks in wax liquid |
| CN104844230A (en) * | 2015-04-24 | 2015-08-19 | 沈阳化工大学 | Method for preparing hydration resistant calcium-containing sand by recovering carbon-containing refractory product wastes |
| CN205077082U (en) * | 2015-11-02 | 2016-03-09 | 上海宝钢铸造有限公司 | Brick is inlayed to protection type heat |
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| CN114230370A (en) * | 2022-01-20 | 2022-03-25 | 海城利尔麦格西塔材料有限公司 | Waterproof method for unburned magnesium-calcium-carbon brick |
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