CN108439958B - Joint refractory material for heat exchange of converter bottom and construction method - Google Patents
Joint refractory material for heat exchange of converter bottom and construction method Download PDFInfo
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- CN108439958B CN108439958B CN201810299227.9A CN201810299227A CN108439958B CN 108439958 B CN108439958 B CN 108439958B CN 201810299227 A CN201810299227 A CN 201810299227A CN 108439958 B CN108439958 B CN 108439958B
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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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- 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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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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
- C04B2235/425—Graphite
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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
- C04B2235/428—Silicon
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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
- C04B2235/70—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
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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)
- Ceramic Products (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a joint refractory material for converter bottom heat exchange, a preparation method and a construction method thereof. The joint refractory material is prepared from a first component and a second component, wherein the first component comprises the following components in percentage by weight: 63-85 wt% of magnesia, 3-10 wt% of asphalt, 4-10 wt% of graphite and 2-17 wt% of metal powder; the second component part comprises 5-15 wt% of resin, 5-15 wt% of alcohol substances and 0.5-1.5wt% of curing agent based on the weight of the first component part. The invention can meet the requirement of the converter bottom of the converter on the service life of 1000-2000 furnaces during the replacement of the converter bottom in a new service and a middle service period, and ensures the normal and safe production of the converter.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to a seam refractory material for heat exchange of a converter bottom and a construction method.
Background
The converter is mainly used for producing carbon steel, alloy steel and smelting copper and nickel, and is the most common steelmaking equipment used at present. The service life of the converter lining is an important factor influencing the continuity of the steelmaking process.
In order to obtain a higher yield, the converter seeks a longer campaign for a long time, which can even reach more than 10000 campaigns. However, in the current steel-making process, the service life of the furnace lining at the bottom of the converter is difficult to synchronize with that of the furnace lining of the converter body, and statistics show that most converters cannot ensure good bottom blowing effect in the whole service of the converter after the furnace life reaches 2000 times, the bottom blowing effect is poor, and even the bottom blowing is directly abandoned. The reasons are mainly that in the early stage of the furnace age, the corrosion of a bottom blowing area or the bottom of the furnace threatens the furnace age, a bottom blowing gun is not communicated after the furnace is repaired, the bottom blowing effect of the whole furnace age is difficult to ensure, the dephosphorization effect is difficult to ensure due to the difficult guarantee of the bottom blowing effect, the carbon oxygen volume at the blowing end point and the oxygen content of molten steel are high, the FeO content of furnace slag is high, the consumption of deoxidizer is increased, the operation of the next procedure is influenced, and the quality of the final product is directly influenced.
The key point for solving the problems lies in quickly replacing the converter bottom, not only repairing the converter bottom, but also maintaining production. In the process of quickly replacing the converter bottom, the main difficulty lies in the problems of compactness and service life of a filler in a gap between a magnesia-carbon refractory material built on a steel shell at the converter bottom and a magnesia-carbon refractory material built on a steel shell at the converter body part, and the service life requirement is up to thousands of furnaces; in the prior art, gaps are basically compacted by means of gravity flow of the filler, and the compactness of the filler cannot be ensured due to insufficient fluidity, so that the service life of the filler is relatively short, even only a dozen furnaces are needed, and therefore, a seam refractory material which can be injected by a mechanical pump and has a long service life for converter bottom heat exchange is needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a joint refractory material for thermal replacement of a converter bottom and a construction method thereof, so as to improve the compactness of a filler and prolong the service life.
The invention realizes the purpose through the following technical scheme:
the invention relates to a joint refractory material for heat exchange of a converter bottom, which is prepared from a first component and a second component, wherein the first component comprises the following components in percentage by weight: 63-85 wt% of magnesia, 3-10 wt% of asphalt, 4-10 wt% of graphite and 2-17 wt% of metal powder; the second component part comprises 5-15 wt% of resin, 5-15 wt% of alcohol substances and 0.5-1.5wt% of curing agent based on the weight of the first component part; the joint refractory material is characterized in that: the self-flowing property is more than or equal to 85 percent, the ball falling time is less than or equal to 15s, and the high-temperature breaking strength (1400 ℃ multiplied by 0.5h) is more than or equal to 9 MPa.
Further, the magnesite is one or a mixture of two of fused magnesite and sintered magnesite in any proportion.
Still further, the content of MgO in the magnesite is >95 wt%.
Further, the metal powder is composed of one or a mixture of two of metal aluminum powder and metal silicon powder in any proportion.
Further, the asphalt is composed of one or a mixture of two of ultrahigh-temperature asphalt powder and ultrahigh-temperature asphalt balls in any proportion.
Preferably, the resin is composed of one of phenolic resin or epoxy resin.
Preferably, the alcohol substance is one of methanol, ethanol and glycol.
Preferably, the curing agent is one of hexamethylenetetramine or toluenesulfonic acid.
The invention relates to a construction method of a joint refractory material for heat exchange of a converter bottom, which is used for constructing the joint refractory material and comprises the following steps:
1) putting the magnesia, the asphalt, the graphite, the metal powder and the curing agent into a stirrer for dry mixing for 3-8 min; adding the resin and the alcohol which are uniformly mixed in advance, stirring and wet-mixing for 6-10 min, and testing the constructability to meet the performance requirement to obtain the required seam refractory material;
2) putting the joint refractory material stirred in the stirrer into a secondary hopper of a pump machine;
3) and pumping the joint refractory material into a gap between the magnesia-carbon refractory material built on the steel shell at the movable furnace bottom and the magnesia-carbon refractory material built on the steel shell at the furnace body part by adopting a mechanical pump pressure injection construction mode.
Further, during construction of the refractory material, the temperature of the refractory material is controlled to be 15-45 ℃;
further, the temperature of the magnesia carbon refractory material built on the steel shell at the furnace body part is between 0 and 900 ℃.
The invention has the beneficial effects that:
the seam refractory material for thermal replacement of the converter bottom has the characteristics of good self-flowing property, high-temperature bending strength, high slag corrosion resistance and the like, and is densely filled in the seam between the new furnace bottom and the furnace body by high-temperature heating, so that the new furnace bottom and the furnace body can be firmly combined, accidents such as steel leakage and the like can be prevented, the requirement of 1000-2000 furnaces in service life when the converter bottom is replaced in a new furnace service and a middle furnace service period can be met, and the normal and safe production of a converter can be ensured.
Detailed Description
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a joint refractory material for heat exchange of a converter bottom, which is prepared from a first component and a second component, wherein the first component comprises the following components in percentage by weight: 63-85 wt% of magnesia, 3-10 wt% of asphalt, 4-10 wt% of graphite and 2-17 wt% of metal powder; the second component part comprises 5-15 wt% of resin, 5-15 wt% of alcohol substances and 0.5-1.5wt% of curing agent based on the weight of the first component part; the joint refractory material is characterized in that: the self-flowing property is more than or equal to 85 percent, the ball falling time is less than or equal to 15s, and the high-temperature breaking strength (1400 ℃ multiplied by 0.5h) is more than or equal to 9 MPa.
Further, the magnesite is one or a mixture of two of fused magnesite and sintered magnesite in any proportion.
Still further, the content of MgO in the magnesite is >95 wt%.
Further, the metal powder is composed of one or a mixture of two of metal aluminum powder and metal silicon powder in any proportion.
Further, the asphalt is composed of one or a mixture of two of ultrahigh-temperature asphalt powder and ultrahigh-temperature asphalt balls in any proportion.
Preferably, the resin is composed of one of phenolic resin or epoxy resin.
Preferably, the alcohol substance is one of methanol, ethanol and glycol.
Preferably, the curing agent is one of hexamethylenetetramine or toluenesulfonic acid.
The invention relates to a construction method of a joint refractory material for heat exchange of a converter bottom, which is used for constructing the joint refractory material and comprises the following steps:
1) putting the magnesia, the asphalt, the graphite, the metal powder and the curing agent into a stirrer for dry mixing for 3-8 min; adding the resin and the alcohol which are uniformly mixed in advance, stirring and wet-mixing for 6-10 min, and testing the constructability to meet the performance requirement to obtain the required seam refractory material;
2) putting the joint refractory material stirred in the stirrer into a secondary hopper of a pump machine;
3) and pumping the joint refractory material into a gap between the magnesia-carbon refractory material built on the steel shell at the movable furnace bottom and the magnesia-carbon refractory material built on the steel shell at the furnace body part by adopting a mechanical pump pressure injection construction mode.
When the refractory material is constructed, controlling the material temperature to be 15-45 ℃;
the temperature of the magnesia-carbon refractory material built on the steel shell at the furnace body part is between 0 and 900 ℃.
When the seam refractory material is constructed in winter, the bonding agent is preheated in advance, and in the pump pressure injection process, the external devices of a stirrer, a pumping pipeline and the like are provided with a heating device, so that the viscosity of the bonding agent is reduced, the flowability of the material is increased, and the construction difficulty is reduced.
The first embodiment is as follows:
the joint refractory material for heat exchange of the converter bottom of the converter provided by the embodiment of the invention is prepared from a first component and a second component, wherein the first component comprises the following components in percentage by weight: 82 wt% of fused magnesia, 3 wt% of ultrahigh-temperature asphalt balls, 4 wt% of graphite, 9 wt% of metal aluminum powder and 2 wt% of metal silicon powder; the second component comprises thermosetting phenolic resin, ethylene glycol and hexamethylene tetramine, wherein the thermosetting phenolic resin accounts for 9 wt% of the weight of the first component, the ethylene glycol accounts for 12 wt% of the weight of the first component, and the curing agent accounts for 0.5w t% of the weight of the first component.
Further, in the first embodiment of the present invention, the maximum particle size of the magnesite is 8mm, and the content of MgO in the magnesite grains is 98 wt%.
And putting the magnesia, the asphalt, the graphite, the metal powder and the curing agent in the weight ratio into a stirrer for dry mixing for 3min, adding the resin and the alcohol substances which are uniformly mixed in advance, and stirring for 8min to obtain the required joint refractory material.
The physical performance indexes of the joint refractory material prepared by the method and the material are as follows: the self-fluidity is 92 percent, the ball falling time is 4.91s, and the high-temperature breaking strength (1400 ℃ multiplied by 0.5h) is 11.87 MPa.
If construction is carried out in winter, the temperature is low, the thermosetting phenolic resin needs to be subjected to water bath treatment in advance, and the temperature of the resin after treatment is about 60 ℃.
Above-mentioned seam refractory material when the construction, can adopt the mode of pump pressure notes to go on, and at the in-process of pump pressure notes, equipment such as mixer and pump sending pipeline outside need carry out heat treatment, guarantees that the material temperature is at 15 ~ 45 ℃.
After the converter is replaced at the hot state, the joint refractory material can be pumped into an annular gap between the magnesia-carbon refractory material built on the steel shell of the active converter bottom and the magnesia-carbon refractory material built on the steel shell of the converter body from the bottom of the active converter bottom by adopting a mechanical pump pressure injection construction mode, the average temperature of the magnesia-carbon refractory material built on the steel shell of the converter body is about 650 ℃, the joint refractory material enters the annular gap and is heated, combusted and solidified at high temperature, finally, the joint refractory material can be densely filled to ensure that the new converter bottom and the converter body are firmly combined, accidents such as steel leakage and the like are prevented, the requirement of the converter bottom on the service life of 1000-2000 furnaces when the converter bottom is replaced at a new furnace service and a middle furnace service is met, and the normal and safe production of the converter is ensured.
Example two:
the second joint refractory material for heat exchange of the converter bottom of the embodiment of the invention is configured by a first component and a second component, wherein the first component comprises the following components in percentage by weight: 75 wt% of sintered magnesite, 7wt% of ultrahigh-temperature asphalt balls, 6 wt% of graphite, 9 wt% of metal aluminum powder and 3 wt% of metal silicon powder; the second component comprises epoxy resin, ethylene glycol and hexamethylene tetramine, wherein the epoxy resin accounts for 10wt% of the weight of the first component, the ethylene glycol accounts for 12 wt% of the weight of the first component, and the curing agent accounts for 1 wt% of the weight of the first component.
Further, the maximum particle size of the magnesite in the second embodiment of the invention is 5mm, and the MgO content in the magnesite grains is 96 wt%.
And putting the magnesia, the asphalt, the graphite, the metal powder and the curing agent in the weight ratio into a stirrer for dry mixing for 6min, adding the resin and the alcohol substances which are uniformly mixed in advance, and stirring for 8min to obtain the required joint refractory material.
If construction is carried out in winter, the temperature is low, the thermosetting phenolic resin needs to be subjected to water bath treatment in advance, and the temperature of the resin after treatment is about 60 ℃.
The physical performance indexes of the joint refractory material prepared by the method and the material are as follows: the self-fluidity is 86.33 percent, the ball dropping time is 9.32s, and the high-temperature rupture strength (1400 ℃ multiplied by 0.5h) is 10.38 MPa.
Above-mentioned seam refractory material when the construction, can adopt the mode of pump pressure notes to go on, and at the in-process of pump pressure notes, equipment such as mixer and pump sending pipeline outside need carry out heat treatment, guarantees that the material temperature is at 15 ~ 45 ℃.
After the converter is replaced at the hot state, the joint refractory material can be pumped into an annular gap between the magnesia-carbon refractory material built on the steel shell at the active converter bottom and the magnesia-carbon refractory material built on the steel shell at the furnace body part from the bottom of the active converter bottom in a mechanical pumping and injection construction mode, the average temperature of the magnesia-carbon refractory material built on the steel shell at the furnace body part is about 200 ℃, the joint refractory material is directly solidified without combustion, the joint refractory material can be densely filled to ensure that the new converter bottom and the furnace body are firmly combined, accidents such as steel leakage and the like are prevented, the requirement of the converter bottom on the service life of 1000-2000 furnaces during new and medium-term replacement of the converter is met, and the normal and safe production of the converter is ensured.
The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and those skilled in the art will understand that the technical features of the present invention can be modified or changed by other equivalent embodiments without departing from the scope of the present invention.
Claims (7)
1. A joint refractory material for heat exchange of a converter bottom is characterized by being prepared from a first component and a second component, wherein the first component comprises the following components in percentage by weight: 63-85 wt% of magnesia, 0-10 wt% of asphalt, 0-10 wt% of graphite and 2-17 wt% of metal powder; the second component part comprises 5-15 wt% of resin, 5-15 wt% of alcohol substances and 0.5-1.5wt% of curing agent based on the weight of the first component part; the physical property indexes of the joint refractory material are as follows: the self-flowing property is more than or equal to 85 percent, the ball falling time is less than or equal to 15s, and the high-temperature breaking strength (1400 ℃ multiplied by 0.5h) is more than or equal to 9 MPa.
2. The joint refractory for the thermal replacement of the bottom of a converter according to claim 1, wherein the magnesite is one or a mixture of two of fused magnesite and sintered magnesite in any proportion; the content of MgO in the magnesite is more than 95 wt%.
3. The joint refractory material for the thermal replacement of the bottom of the converter according to claim 1, wherein the metal powder is a mixture of one or two of metal aluminum powder and metal silicon powder in any proportion; the asphalt is composed of one or a mixture of two of ultrahigh-temperature asphalt powder and ultrahigh-temperature asphalt balls in any proportion.
4. The joint refractory for heat exchange at the bottom of a converter according to claim 1, wherein the resin is one of a phenolic resin and an epoxy resin; the alcohol substance is one of methanol, ethanol and glycol; the curing agent is one of hexamethylene tetramine or toluene sulfonic acid.
5. A method for constructing a joint refractory for heat exchange at the bottom of a converter, which comprises constructing the joint refractory according to any one of claims 1 to 4, the method comprising:
1) putting the magnesia, the asphalt, the graphite, the metal powder and the curing agent into a stirrer for dry mixing for 3-8 min; adding the resin and the alcohol which are uniformly mixed in advance, stirring and wet-mixing for 6-10 min, and testing the constructability to meet the performance requirement to obtain the required seam refractory material;
2) putting the joint refractory material stirred in the stirrer into a secondary hopper of a pump machine;
3) and pumping the joint refractory material into a gap between the magnesia-carbon refractory material built on the steel shell at the movable furnace bottom and the magnesia-carbon refractory material built on the steel shell at the furnace body part by adopting a mechanical pump pressure injection construction mode.
6. The method for constructing the joint refractory for the heat exchange of the bottom of the converter as claimed in claim 5, wherein the temperature of the refractory is controlled to be 15-45 ℃ during construction.
7. The construction method of the joint refractory for the thermal replacement of the bottom of the converter according to claim 5, wherein the temperature of the magnesia carbon refractory laid on the steel shell at the shaft portion is 0 to 900 ℃.
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| CN201810299227.9A CN108439958B (en) | 2018-04-04 | 2018-04-04 | Joint refractory material for heat exchange of converter bottom and construction method |
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| CN201810299227.9A CN108439958B (en) | 2018-04-04 | 2018-04-04 | Joint refractory material for heat exchange of converter bottom and construction method |
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| CN109626966A (en) * | 2018-12-26 | 2019-04-16 | 武汉如星科技有限公司 | A kind of environment-friendly type Fast Sintering Large face repair material of converter and preparation method thereof |
| CN110483021A (en) * | 2019-09-12 | 2019-11-22 | 郑州金利窑炉工程有限公司 | A kind of grouting material and its application method for converter |
| CN113651601A (en) * | 2021-09-13 | 2021-11-16 | 济南鲁东耐火材料有限公司 | Converter with replaceable converter bottom and construction method for primary building |
| CN114231689B (en) * | 2021-12-22 | 2023-06-23 | 济南鲁东耐火材料有限公司 | Pressing device, test device and test method for converter movable furnace bottom filling material |
| CN115537626B (en) * | 2022-09-14 | 2023-05-12 | 首钢集团有限公司 | Magnesia carbon refractory material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105367086A (en) * | 2014-08-21 | 2016-03-02 | 青岛炜烨锻压机械有限公司 | High efficiency repairing material and preparation technology thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105367086A (en) * | 2014-08-21 | 2016-03-02 | 青岛炜烨锻压机械有限公司 | High efficiency repairing material and preparation technology thereof |
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