CN118146029A - Pretreatment method for reducing carbon deposition of refractory bricks in reducing atmosphere - Google Patents
Pretreatment method for reducing carbon deposition of refractory bricks in reducing atmosphere Download PDFInfo
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- CN118146029A CN118146029A CN202410269950.8A CN202410269950A CN118146029A CN 118146029 A CN118146029 A CN 118146029A CN 202410269950 A CN202410269950 A CN 202410269950A CN 118146029 A CN118146029 A CN 118146029A
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5089—Silica sols, alkyl, ammonium or alkali metal silicate cements
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention belongs to the technical field of refractory materials, and relates to a pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere. The related pretreatment method for reducing carbon deposition of the refractory bricks in the reducing atmosphere is mainly to pretreat the prepared refractory bricks, and comprises the steps of impregnating the refractory bricks with inorganic sol under normal pressure and vacuum conditions; the method comprises the following steps: placing refractory bricks into a vacuum cabinet, vacuumizing to make the vacuum degree of the refractory bricks smaller than 1Pa, and keeping the refractory bricks for 10min; introducing inorganic sol into the vacuum environment to submerge the refractory bricks, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; the impregnated refractory bricks are taken out and dried. According to the invention, the refractory bricks are immersed by inorganic sol under normal pressure and vacuum conditions, and the pores of the refractory bricks are blocked by the inorganic sol to reduce the diffusion of CO gas into the brick body, so that the carbon deposition in the refractory bricks under the reducing atmosphere is reduced.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere.
Background
The high-alumina brick has high refractoriness, small high-temperature creep, excellent thermal shock resistance and erosion resistance, can be applied to bricking blast furnaces, hot blast stoves, furnace tops of electric furnaces, blast furnaces, rotary kiln linings and the like, and is widely used as open-hearth heat accumulating type checker bricks, nozzle bricks and the like; the clay brick has low manufacturing cost, high compressive strength, better thermal shock resistance and excellent acid slag erosion resistance, is a common refractory material with extremely wide application range, and can be applied to industrial furnaces such as dry quenching coke ovens, gas heating furnaces, ladle linings, aluminum smelting furnaces and the like; the service environment of a plurality of high-temperature industrial equipment using refractory bricks such as high-alumina bricks, clay bricks and the like is a reducing atmosphere, particularly a gas environment, and the chemical composition of steel mill gas is shown in Table 1; the CO in the reducing atmosphere readily decomposes under the catalytic action of iron to produce CO 2 and solid carbon which is deposited in the pores of the refractory brick, resulting in premature spalling or destruction of the refractory brick. Raw materials with low iron content and elevated sintering temperatures of refractory materials are generally chosen to increase the CO erosion resistance of the material, but these solutions are not always very effective in practical industrial applications.
TABLE 1 chemical composition of steel mill gas/%
Disclosure of Invention
The invention aims to provide a pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere, so that the use stability of products in the reducing atmosphere can be improved.
The invention adopts the following technical scheme for accomplishing the purposes of the invention:
A pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere mainly comprises the steps of pretreating prepared refractory bricks, and impregnating the refractory bricks with inorganic sol under normal pressure and vacuum conditions; the method comprises the following steps:
Placing refractory bricks into a vacuum cabinet, vacuumizing to make the vacuum degree of the refractory bricks smaller than 1Pa, and keeping the refractory bricks for 10min;
Introducing inorganic sol into the vacuum environment to submerge the refractory bricks, and standing for 10min;
Opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes;
the impregnated refractory bricks are taken out and dried.
The refractory bricks are high-alumina bricks, corundum bricks, mullite bricks and clay bricks.
The inorganic sol is one of silica sol and aluminum sol.
According to the pretreatment method for reducing carbon deposition of the refractory bricks in the reducing atmosphere, the refractory bricks are immersed by inorganic sol under normal pressure and vacuum conditions, and the pores of the refractory bricks are blocked by the inorganic sol to reduce the diffusion of CO gas into the brick body, so that the carbon deposition of the refractory bricks in the reducing atmosphere is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. 2 parts of vacuum cabinet, 2 parts of refractory bricks, 3 parts of valves 1 and 4 parts of valves 2 and 5 parts of vacuum pump, 6 parts of inorganic sol.
Detailed Description
The invention will be described in detail with reference to the accompanying drawings and specific embodiments:
examples
Placing the high-alumina brick into a vacuum cabinet, vacuumizing to make the vacuum degree of the high-alumina brick smaller than 1Pa, and keeping the high-alumina brick for 10min; introducing silica sol in a vacuum environment to submerge the high-alumina brick, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the impregnated high alumina brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Firstly, placing refractory bricks into a vacuum cabinet, enabling a valve 1 to be in an open state, enabling a valve 2 to be in a closed state, opening a vacuum pump to enable the pressure in the vacuum cabinet to be less than 1Pa, then sequentially closing a valve 3 and the vacuum pump to be kept for 3min, and if a pressure gauge does not rise within three min, indicating that the vacuum cabinet is good in tightness and kept for 10min; then opening the valve 2, allowing inorganic sol to enter a vacuum cabinet, closing the valve 2 when the inorganic sol submerges refractory bricks, and keeping for 10min; finally, the inorganic sol container is removed, the valve 2 is opened, normal pressure is restored in the vacuum cabinet and maintained for 10min, and the refractory bricks are fully impregnated with the inorganic sol.
Example 2:
Placing the corundum bricks into a vacuum cabinet, vacuumizing to make the vacuum degree of the corundum bricks smaller than 1Pa, and keeping the corundum bricks for 10min; introducing silica sol under vacuum environment to submerge corundum bricks, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the immersed corundum brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Examples
Placing the mullite brick into a vacuum cabinet, vacuumizing to make the vacuum degree of the mullite brick smaller than 1Pa, and keeping the mullite brick for 10min; introducing silica sol in a vacuum environment to submerge the mullite brick, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the impregnated mullite brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Examples
Placing the clay bricks into a vacuum cabinet, vacuumizing to make the vacuum degree of the clay bricks smaller than 1Pa, and keeping the clay bricks for 10min; introducing silica sol in a vacuum environment to submerge the clay bricks, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the impregnated clay brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Examples
Placing the high-alumina brick into a vacuum cabinet, vacuumizing to make the vacuum degree of the high-alumina brick smaller than 1Pa, and keeping the high-alumina brick for 10min; introducing aluminum sol into the vacuum environment to submerge the high-alumina bricks, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the impregnated high alumina brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Example 6:
Placing the corundum bricks into a vacuum cabinet, vacuumizing to make the vacuum degree of the corundum bricks smaller than 1Pa, and keeping the corundum bricks for 10min; introducing aluminum sol into the vacuum environment to submerge corundum bricks, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the immersed corundum brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Examples
Placing the mullite brick into a vacuum cabinet, vacuumizing to make the vacuum degree of the mullite brick smaller than 1Pa, and keeping the mullite brick for 10min; introducing aluminum sol in a vacuum environment to submerge the mullite brick, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the impregnated mullite brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Examples
Placing the clay bricks into a vacuum cabinet, vacuumizing to make the vacuum degree of the clay bricks smaller than 1Pa, and keeping the clay bricks for 10min; introducing aluminum sol into the vacuum environment to submerge the clay bricks, and standing for 10min; opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes; taking out the impregnated clay brick, drying at 110 ℃ for 24 hours, and drying at 450 ℃ for 2 hours. The pretreated product is eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
Meanwhile, in order to compare the effects of the present invention, a comparative sample was prepared.
Comparative sample 1: the untreated high alumina bricks are eroded for 60 hours in a reducing atmosphere at 550 ℃ and the weight change caused by carbon deposition before and after erosion is compared.
Comparative sample 2: the untreated corundum bricks are eroded for 60 hours in a reducing atmosphere at 550 ℃ and the weight change caused by carbon deposition before and after erosion is compared.
Comparative sample 3: the untreated mullite brick is eroded for 60 hours in a reducing atmosphere at 550 ℃ and the weight change caused by carbon deposition before and after erosion is compared.
Comparative sample 4: the clay bricks which are not pretreated are eroded for 60 hours in a reducing atmosphere at 550 ℃, and the weight change caused by carbon deposition before and after erosion is compared.
The mass fraction of the carbon deposit amount of each scheme for corrosion for 60 hours in a reducing atmosphere at 550 ℃ is shown in table 1.
Table 1 mass fraction of carbon deposit in each scheme%
Claims (3)
1. A pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere is characterized by comprising the following steps: the method is to impregnate the refractory bricks with inorganic sol under normal pressure and vacuum condition; the method comprises the following steps:
Placing refractory bricks into a vacuum cabinet, vacuumizing to make the vacuum degree of the refractory bricks smaller than 1Pa, and keeping the refractory bricks for 10min;
Introducing inorganic sol into the vacuum environment to submerge the refractory bricks, and standing for 10min;
Opening a ventilation valve to enable the inside of the vacuum cabinet to recover normal pressure and keep the normal pressure for 10 minutes;
the impregnated refractory bricks are taken out and dried.
2. A pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere as defined in claim 1, wherein: the refractory bricks are high-alumina bricks, corundum bricks, mullite bricks and clay bricks.
3. A pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere as defined in claim 1, wherein: a pretreatment method for reducing carbon deposition of refractory bricks in a reducing atmosphere is characterized by comprising the following steps: the inorganic sol is one of silica sol and aluminum sol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410269950.8A CN118146029A (en) | 2024-03-11 | 2024-03-11 | Pretreatment method for reducing carbon deposition of refractory bricks in reducing atmosphere |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410269950.8A CN118146029A (en) | 2024-03-11 | 2024-03-11 | Pretreatment method for reducing carbon deposition of refractory bricks in reducing atmosphere |
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| CN118146029A true CN118146029A (en) | 2024-06-07 |
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| CN202410269950.8A Pending CN118146029A (en) | 2024-03-11 | 2024-03-11 | Pretreatment method for reducing carbon deposition of refractory bricks in reducing atmosphere |
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| CN (1) | CN118146029A (en) |
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- 2024-03-11 CN CN202410269950.8A patent/CN118146029A/en active Pending
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