CN106396690B - Novel magnesium-aluminum-carbon brick manufactured by utilizing carbon-containing residual ladle lining brick and production method and application thereof - Google Patents
Novel magnesium-aluminum-carbon brick manufactured by utilizing carbon-containing residual ladle lining brick and production method and application thereof Download PDFInfo
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- 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
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- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3821—Boron carbides
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- 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
- C04B2235/401—Alkaline earth metals
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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
Abstract
The invention discloses a novel magnesium-aluminum-carbon brick manufactured by utilizing a carbon-containing residual ladle lining brick and a production method and application thereof. The magnesium-aluminum-carbon brick comprises the following components in parts by weight: carbon-containing residual ladle lining brick: 40-60 parts; magnesia: 20-40 parts; alumina: 5-15 parts; carbon: 1-6 parts; additive: 2-10 parts; adding a bonding agent: 3-5 parts. The magnesia-alumina-carbon brick has obviously improved service performance and higher erosion resistance and stripping resistance; through cost accounting, the carbon-containing residual ladle lining bricks are recycled, and the novel magnesia-alumina-carbon brick has a certain cost reduction range compared with the conventional magnesia-alumina-carbon brick; the carbon-containing residual ladle lining bricks are recycled infinitely, the enterprise and social benefits are improved, and precious refractory material resources are saved.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a magnesia-alumina-carbon brick, a production method of the magnesia-alumina-carbon brick, and application of the magnesia-alumina-carbon brick to a ladle.
Background
In the metallurgical industry, molten steel needs to be stored and transported by a ladle, and some ladles are used as an external refining container, so that the inside of the ladle needs to bear the etching and scouring action of the molten steel and steel slag at the high temperature of more than 1600 ℃, the use condition is severe, the working layer of the part directly contacting the molten steel and the steel slag needs to be made of high-quality refractory materials. At present, a used steel ladle consists of a steel shell, supporting legs, a lifting trunnion and a lifting hook member, a heat insulation layer, a permanent layer and a working layer are sequentially arranged in the steel shell, wherein the working layer comprises carbon-containing slag line lining bricks and carbon-containing molten pool lining bricks, the slag line part is built by magnesia carbon bricks, the molten pool part is built by alumina-magnesia carbon bricks, the steel ladle is subjected to the etching effect of molten steel and steel slag in the use process, the lining in the slag line molten pool working layer is continuously thinned along with the increase of the use times of the steel ladle, the thinning exceeds a certain safety range, the steel ladle is stopped to be used, and the lining in the working layer must be repaired or.
Because the slag line part is seriously eroded by the steel slag, usually, the slag line lining brick needs to be replaced once or many times midway, which is called minor repair, when the slag line lining brick is removed for the last time, the slag line lining brick is removed together with the molten pool lining brick, the lining brick of the steel ladle working layer is rebuilt, which is called major repair, the carbon-containing residual ladle lining brick removed by the major repair accounts for about 30 to 50 percent of the total building amount of the carbon-containing residual ladle lining brick of the working layer, and the residual ladle lining brick is generally treated as industrial garbage, thereby not only polluting the environment, but also causing serious waste of precious refractory material resources on the one hand; on the other hand, the aluminum-magnesia carbon bricks adopted at the molten pool part have the defects of poor fire resistance, short service life and incapability of meeting the requirements of the steelmaking process.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the novel magnesium-aluminum-carbon brick manufactured by utilizing the carbon-containing residual ladle lining brick, which is used for collecting, processing and using the carbon-containing residual ladle lining brick, saves refractory materials, improves the refractory performance of a molten pool part and prolongs the service life of a ladle.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a novel magnesia-alumina-carbon brick manufactured by utilizing a carbon-containing residual ladle lining brick comprises the following components in parts by weight: carbon-containing residual ladle lining brick: 40-60 parts; magnesia: 20-40 parts; alumina: 5-15 parts; carbon: 1-6 parts; additive: 2-10 parts; adding a bonding agent: 3-5 parts.
In the novel magnesium-aluminum-carbon brick manufactured by utilizing the carbon-containing residual ladle lining brick, optionally, the additive is one or more of metal magnesium powder, magnesium oxide ultrafine powder, silicon carbide ultrafine powder, metal aluminum powder, metal silicon powder, boron carbide powder and borax, the additive is favorable for improving the forming strength, the strength of a semi-finished product after being dried, the corrosion of molten steel and steel slag in the using process of the product, the cyclic utilization of the residual refractory material in the system in the production process of the product, the non-hydration deterioration of the residual refractory material after being used by the ladle and the stability of the strength and performance of the residual refractory material of the product are favorably improved, the infinite cyclic recycling of the residual refractory material in the system is realized, the zero emission of the residual refractory material is realized, and the novel magnesium-aluminum-carbon brick is a mixed powdery substance.
In the novel magnesia-alumina-carbon brick produced by using the carbon-containing residual ladle brick, the binder may be thermoplastic phenolic resin, thermosetting resin, silicone resin or magnesium micro powder.
In the above-mentioned novel magnesia-alumina-carbon brick produced by using the carbonaceous residual ladle brick, optionally, the particle size in the raw material formulation is as follows: 35-70% of 8mm-1mm coarse particles, 10-30% of 1-0mm medium particles and 20-35% of 180-mesh fine powder.
The invention also provides a production method of the novel magnesia-alumina-carbon brick manufactured by utilizing the carbonaceous residual ladle lining brick, which comprises the following specific steps:
step S1, collecting and processing the carbon-containing residual ladle lining brick
1) The removed carbon-containing residual ladle lining bricks are stacked in a centralized manner, manually selected or selected by special equipment, then steel slag on the working layer of the carbon-containing residual ladle lining bricks is removed, and qualified carbon-containing residual ladle lining bricks are collected and stacked in a clean and non-mixed dry place;
2) crushing the collected qualified carbon-containing residual ladle lining bricks, sieving according to specified grain size, and quantitatively packaging according to the grain size or directly feeding the carbon-containing residual ladle lining bricks into a proportioning bin of an automatic proportioning system for later use;
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 40-60 parts; magnesia: 20-40 parts; alumina: 5-15 parts; carbon: 1-6 parts; additive: 2-10 parts; adding a bonding agent: 3-5 parts;
2) the granularity of the raw materials is as follows: 35-70% of 8mm-1mm coarse particles, 10-30% of 1-0mm medium particles and 20-35% of 180-mesh fine powder;
step S3, premixing raw materials
Pre-mixing the fine powder of 180 meshes in the step S2, and storing the fine powder in a dry place or a proportioning bin;
step S4, pug
1) Adding coarse and medium particles into a mixing machine according to a raw material formula, adding a bonding agent accounting for 30-60% of the total bonding agent amount, mixing, adding premixed fine powder and the rest bonding agent, continuously mixing to obtain a pug with good forming performance, wherein the total mixing time is 10-35min, and discharging;
2) putting the mud into a ton bag, wherein the storage time is not more than one day;
step S5, press forming
1) Molding by adopting a 1000-ton press, installing a mold according to the molded brick shape, and finishing molding the pug within a limited time;
2) placing the semi-finished bricks with qualified appearance on a drying vehicle, and naturally drying for 24-48 h;
step S6, baking
The method comprises the steps of lightly burning in a heat treatment kiln in a drying kiln, controlling the temperature at 140 ℃ and 200 ℃, and carrying out heat treatment for 6-20 h;
step S7, checking, packaging and warehousing
And after the baked product is inspected to be qualified, packaging the baked product according to the variety and the brick shape, and warehousing the baked product, and identifying the baked product for later use.
In the step S2, optionally, the additive is one or more of metal magnesium powder, magnesium oxide ultrafine powder, silicon carbide ultrafine powder, metal aluminum powder, metal silicon powder, boron carbide powder, and borax.
In the step S2, the binder may be a thermoplastic phenolic resin, a thermosetting resin, a silicone resin, or a magnesium-based micro powder.
In the step S6, optionally, the baking schedule is: raising the temperature from room temperature to 100 ℃ according to the speed of 20 ℃/h, preserving the heat for 4h, raising the temperature to 150 ℃ according to the speed of 10 ℃/h, preserving the heat for 8h, raising the temperature to 200 ℃ according to the speed of 15 ℃/h, and preserving the heat for 8 h.
The invention also provides application of the novel magnesium-aluminum-carbon brick manufactured by utilizing the carbon-containing residual ladle lining brick on a ladle.
Compared with the prior art, the beneficial effects which can be realized by the invention at least comprise the following aspects:
(1) the magnesia-alumina-carbon brick provided by the invention adopts the carbon-containing residual ladle lining brick for recycling, realizes the infinite cyclic utilization of the carbon-containing residual ladle lining brick, improves the enterprise and social benefits, and saves precious refractory material resources; compared with the existing alumina-magnesia carbon brick, the cost is greatly reduced;
(2) the magnesia-alumina-carbon brick has obviously improved service performance, higher erosion resistance and stripping resistance, and at least 5 times longer service life;
(3) the novel magnesium-aluminum-carbon brick is subjected to an infinite cyclic process from production and use to collection and processing of the carbon-containing residual ladle lining brick, and is recycled, so that management is enhanced, and zero emission of the carbon-containing residual ladle lining brick in the production and use process can be realized.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention.
FIG. 1 is a flow chart of a production method of the novel magnesia-alumina-carbon brick manufactured by utilizing the carbonaceous residual ladle lining brick.
Detailed Description
First, it should be noted that the features and advantages of the method for producing the novel magnesia-alumina-carbon brick using the carbonaceous residual ladle brick of the present invention will be specifically described below by way of example, however, all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein.
Referring to fig. 1, the following will illustrate the novel magnesia-alumina-carbon brick made of carbon-containing residual ladle brick and its production method and application by using this embodiment.
Example 1
In this embodiment, the novel magnesia-alumina-carbon brick manufactured by using the carbon-containing residual ladle lining brick has the following formula by weight: carbon-containing residual ladle lining brick: 40 parts of a mixture; magnesia: 40 parts of a mixture; alumina: 10 parts of (A); carbon: 5 parts of a mixture; metal magnesium powder: 5 parts of a mixture; thermoplastic phenolic resin: 3 parts of a raw material formula, wherein the particle size composition of the raw material formula is as follows: 70 percent of coarse particles with the diameter of 8mm-1mm, 10 percent of particles with the diameter of 1-0mm and 20 percent of fine powder with the diameter of less than 180 meshes.
As shown in fig. 1, a flow chart of a production method of a novel magnesia-alumina-carbon brick manufactured by using a carbon-containing residual ladle lining brick comprises the following specific steps:
step S1, collecting and processing the carbon-containing residual ladle lining brick
1) The removed carbon-containing residual ladle lining bricks are stacked in a centralized manner, manually selected or selected by special equipment, then steel slag on the working layer of the carbon-containing residual ladle lining bricks is removed, and qualified carbon-containing residual ladle lining bricks are collected and stacked in a clean and non-mixed dry place;
2) crushing the collected qualified carbon-containing residual ladle lining bricks, sieving according to specified grain size, and quantitatively packaging according to the grain size or directly feeding the carbon-containing residual ladle lining bricks into a proportioning bin of an automatic proportioning system for later use;
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 40 parts of a mixture; magnesia: 40 parts of a mixture; alumina: 10 parts of (A); carbon: 5 parts of a mixture; metal magnesium powder: 5 parts of a mixture; thermoplastic phenolic resin: 3 parts of a mixture;
2) the granularity of the raw materials is as follows: 70% of coarse particles with the diameter of 8mm-1mm, 10% of particles with the diameter of 1-0mm and 20% of fine powder with the diameter of less than 180 meshes;
step S3, premixing raw materials
Pre-mixing the fine powder of 180 meshes in the step S2, and storing the fine powder in a dry place or a proportioning bin;
step S4, pug
1) Adding coarse and medium particles into a mixing machine according to a raw material formula, adding thermoplastic phenolic resin accounting for 50% of the total amount of the thermoplastic phenolic resin, mixing, adding premixed fine powder and the rest thermoplastic phenolic resin, continuously mixing to obtain pug with good forming property, wherein the total mixing time is 35min, and discharging;
2) putting the mud into a ton bag, wherein the storage time is not more than one day;
step S5, press forming
1) Molding by adopting a 1000-ton press, installing a mold according to the molded brick shape, and finishing molding the pug within a limited time;
2) placing the semi-finished bricks with qualified appearance on a drying vehicle, and naturally drying for 24 hours;
step S6, baking
Performing heat treatment in a drying kiln, controlling the temperature at 150 ℃, and firing for 8 h; the baking system is as follows: heating the mixture from room temperature to 100 ℃ at a speed of 20 ℃/h, preserving heat for 4h, heating the mixture to 150 ℃ at a speed of 10 ℃/h, preserving heat for 8h, heating the mixture to 200 ℃ at a speed of 15 ℃/h, and preserving heat for 8 h;
step S7, checking, packaging and warehousing
And after the baked product is inspected to be qualified, packaging the baked product according to the variety and the brick shape, and warehousing the baked product, and identifying the baked product for later use.
Example 2
In this embodiment, the novel magnesia-alumina-carbon brick manufactured by using the carbon-containing residual ladle lining brick has the following formula by weight: carbon-containing residual ladle lining brick: 50 parts of a mixture; magnesia: 35 parts of (B); alumina: 10 parts of (A); carbon: 2 parts of (1); borax: 3 parts of a mixture; thermosetting resin: 4 parts, wherein the particle size composition in the raw material formula is as follows: 55 percent of coarse particles with the diameter of 8mm-1mm, 25 percent of particles with the diameter of 1-0mm and 20 percent of fine powder with the diameter of less than 180 meshes.
The basic steps of the production method of the novel magnesia-alumina-carbon brick manufactured by using the carbonaceous residual ladle lining brick in the embodiment are the same as those of the embodiment 1, and the difference is that:
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 50 parts of a mixture; magnesia: 35 parts of (B); alumina: 10 parts of (A); carbon: 2 parts of (1); borax: 3 parts of a mixture; thermosetting resin: 4 parts of a mixture;
2) the granularity of the raw materials is as follows: 55% of 8mm-1mm coarse particles, 25% of 1-0mm medium particles and 20% of fine powder below 180 meshes;
step S6, baking
And (4) performing heat treatment in a drying kiln at 200 ℃ for 8 h.
Example 3
In this embodiment, the novel magnesia-alumina-carbon brick manufactured by using the carbon-containing residual ladle lining brick has the following formula by weight: carbon-containing residual ladle lining brick: 60 parts; magnesia: 20 parts of (1); alumina: 6 parts of (1); carbon: 6 parts of (1); boron carbide powder: 8 parts of a mixture; silicone resin: 5 parts, wherein the particle size composition in the raw material formula is as follows: 60% of coarse particles with the diameter of 8mm-1mm, 15% of particles with the diameter of 1-0mm and 25% of fine powder with the diameter of less than 180 meshes.
The basic steps of the production method of the novel magnesia-alumina-carbon brick manufactured by using the carbonaceous residual ladle lining brick in the embodiment are the same as those of the embodiment 1, and the difference is that:
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 60 parts; magnesia: 20 parts of (1); alumina: 6 parts of (1); carbon: 6 parts of (1); boron carbide powder: 8 parts of a mixture; silicone resin: 5 parts of a mixture;
2) the granularity of the raw materials is as follows: 60% of coarse particles with the diameter of 8mm-1mm, 15% of medium particles with the diameter of 1-0mm and 25% of fine powder with the diameter below 180 meshes;
step S6, baking
And (4) carrying out heat treatment in a drying kiln for 12 hours at the temperature of 180 ℃.
Example 4
In this embodiment, the novel magnesia-alumina-carbon brick manufactured by using the carbon-containing residual ladle lining brick has the following formula by weight: carbon-containing residual ladle lining brick: 45 parts of (1); magnesia: 40 parts of a mixture; alumina: 5 parts of a mixture; carbon: 3 parts of a mixture; aluminum silicon type: 7 parts; thermoplastic phenolic resin: 3.5 parts, wherein the particle size composition in the raw material formula is as follows: 50% of coarse particles with the diameter of 8mm-1mm, 30% of particles with the diameter of 1-0mm and 20% of fine powder with the diameter of less than 180 meshes.
The basic steps of the production method of the novel magnesia-alumina-carbon brick manufactured by using the carbonaceous residual ladle lining brick in the embodiment are the same as those of the embodiment 6, and the difference is that:
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 45 parts of (1); magnesia: 40 parts of a mixture; alumina: preparing; carbon: preparing; aluminum silicon carbide: 7 parts; thermoplastic phenolic resin: 3.5 parts;
2) the granularity of the raw materials is as follows: 50% of coarse particles with the diameter of 8mm-1mm, 30% of particles with the diameter of 1-0mm and 20% of fine powder with the diameter of less than 180 meshes;
step S6, baking
And (4) performing heat treatment in a drying kiln at 160 ℃ for 18 h.
Example 5
In this embodiment, the novel magnesia-alumina-carbon brick manufactured by using the carbon-containing residual ladle lining brick has the following formula by weight: carbon-containing residual ladle lining brick: 55 parts of (1); magnesia: 20 parts of (1); alumina: 15 parts of (1); carbon: 2 parts of (1); silicon-based: 3 parts of a mixture; magnesium micro powder: 5 parts, wherein the particle size composition in the raw material formula is as follows: 45 percent of coarse particles with the diameter of 8mm-1mm, 23 percent of medium particles with the diameter of 1-0mm and 32 percent of fine powder with the diameter of less than 180 meshes.
The basic steps of the production method of the novel magnesia-alumina-carbon brick manufactured by using the carbonaceous residual ladle lining brick in the embodiment are the same as those of the embodiment 1, and the difference is that:
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 55 parts of (1); magnesia: 20 parts of (1); alumina: 15 parts of (1); carbon: 2 parts of (1); silicon-based: 3 parts of a mixture; magnesium micro powder: 5 parts of a mixture;
2) the granularity of the raw materials is as follows: 45% of coarse particles with the diameter of 8mm-1mm, 23% of medium particles with the diameter of 1-0mm and 32% of fine powder with the diameter below 180 meshes;
step S6, baking
And (4) performing heat treatment in a drying kiln at the temperature of 170 ℃ for 15 h.
Example 6
In this embodiment, the novel magnesia-alumina-carbon brick manufactured by using the carbon-containing residual ladle lining brick has the following formula by weight: carbon-containing residual ladle lining brick: 58 parts of a mixture; magnesia: 30 parts of (1); alumina: 5 parts of a mixture; carbon: 2 parts of (1); carbides: 5 parts of a mixture; thermoplastic phenolic resin: 3.5 parts, wherein the particle size composition in the raw material formula is as follows: 60% of coarse particles with the diameter of 8mm-1mm, 20% of particles with the diameter of 1-0mm and 20% of fine powder with the diameter of less than 180 meshes.
The basic steps of the production method of the novel magnesia-alumina-carbon brick manufactured by using the carbonaceous residual ladle lining brick in the embodiment are the same as those of the embodiment 1, and the difference is that:
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 60 parts; magnesia: 18 parts of a mixture; alumina: 8 parts of a mixture; carbon: 4 parts of a mixture; magnesium carbides: 10 parts of (A); thermoplastic phenolic resin: 3.5 parts;
2) the granularity of the raw materials is as follows: 60% of coarse particles with the diameter of 8mm-1mm, 20% of particles with the diameter of 1-0mm and 20% of fine powder with the diameter of less than 180 meshes;
step S6, baking
And (4) performing heat treatment in a drying kiln at 190 ℃ for 15 h.
The novel magnesia-alumina-carbon bricks obtained in the embodiments 1 to 6 are applied to a molten pool part below a ladle slag line brick of a special steel company, six layers of magnesia-alumina-carbon bricks are built originally, and the produced novel magnesia-alumina-carbon bricks are used for twice comparison with the magnesia-alumina-carbon bricks in production at a ladle molten pool part refined outside a furnace.
Firstly, replacing the upper two layers of six layers of the alumina-magnesia carbon bricks at the original molten pool part with novel alumina-magnesia carbon bricks, wherein a small amount of adjusting bricks on the same layer are still built by the alumina-magnesia carbon bricks, and obvious depressions are found to appear in the adjusting bricks before the minor repair of the steel ladle; the magnesia-alumina carbon bricks on the upper part of the molten pool are about 20mm more prominent than the magnesia-alumina carbon bricks on the lower part of the molten pool;
the second time, opposite with first time, go up two-layer almag carbon brick for, four layers are built by laying bricks or stones with novel magnalium carbon brick down, and the lower floor mixes to build has a small amount of almag carbon brick, and novel magnalium carbon brick builds by laying bricks or stones with almag carbon brick and uses the back, and the contrast result is very obvious before the minor repair, and obvious sunken appears in the almag carbon brick, and novel magnalium carbon brick demonstrates better advantage and leeway.
The magnesia-alumina-carbon brick has obviously raised use performance, high erosion resistance and stripping resistance and at least 5 times increased service life.
Claims (6)
1. A magnesium aluminum carbon brick manufactured by utilizing a carbon-containing residual ladle lining brick is characterized in that the formula comprises the following components in parts by weight: carbon-containing residual ladle lining brick: 40-60 parts; magnesia: 20-40 parts; alumina: 5-15 parts; carbon: 1-6 parts; additive: 2-10 parts; binding agent: 3-5 parts; the additive is magnesium oxide superfine powder.
2. The magnesia-alumina-carbon brick made of carbon-containing residual ladle brick as claimed in claim 1, wherein the binder is thermoplastic phenolic resin, thermosetting resin, silicone resin or magnesium micro powder.
3. The magnesia-alumina-carbon brick made of carbon-containing residual ladle brick as claimed in claim 1, wherein the particle size of the raw material formula is as follows: 35-70% of 8mm-1mm coarse particles, 10-30% of 1-0mm medium particles and 20-35% of 180-mesh fine powder.
4. A method for producing magnesia-alumina-carbon bricks by using carbon-containing residual ladle lining bricks according to any one of claims 1 to 3, which is characterized by comprising the following specific steps:
step S1, collecting and processing the carbon-containing residual ladle lining brick
1) The removed carbon-containing residual ladle lining bricks are stacked in a centralized manner, manually selected or selected by special equipment, then steel slag on the working layer of the carbon-containing residual ladle lining bricks is removed, and qualified carbon-containing residual ladle lining bricks are collected and stacked in a clean and non-mixed dry place;
2) crushing the collected qualified carbon-containing residual ladle lining bricks, sieving according to specified grain size, and quantitatively packaging according to the grain size or directly feeding the carbon-containing residual ladle lining bricks into a proportioning bin of an automatic proportioning system for later use;
step S2, raw material preparation
1) The preparation method comprises the following steps of: carbon-containing residual ladle lining brick: 40-60 parts; magnesia: 20-40 parts; alumina: 5-15 parts; carbon: 1-6 parts; additive: 2-10 parts; binding agent: 3-5 parts; the additive is magnesium oxide ultrafine powder;
2) the granularity of the raw materials is as follows: 35-70% of 8mm-1mm coarse particles, 10-30% of 1-0mm medium particles and 20-35% of 180-mesh fine powder;
step S3, premixing raw materials
Pre-mixing the fine powder of 180 meshes in the step S2, and storing the fine powder in a dry place or a proportioning bin;
step S4, pug
1) Adding coarse and medium particles into a mixing machine according to a raw material formula, adding a bonding agent accounting for 30-60% of the total bonding agent amount, mixing, adding premixed fine powder and the rest bonding agent, continuously mixing to obtain good performance of the formed pug, wherein the total mixing time is 10-35min, and discharging;
2) putting the mud into a ton bag, wherein the storage time is not more than one day;
step S5, press forming
1) Molding by adopting a 1000-ton press, installing a mold according to the molded brick shape, and finishing molding the pug within a limited time;
2) placing the semi-finished bricks with qualified appearance on a drying vehicle, and naturally drying for 24-48 h;
step S6, baking
Adopting a drying kiln for heat treatment, controlling the temperature at 140-;
step S7, checking, packaging and warehousing
And after the baked product is inspected to be qualified, packaging the baked product according to the variety and the brick shape, and warehousing the baked product, and identifying the baked product for later use.
5. The method of claim 4, wherein in step S2, the binder is phenolic resin, thermosetting resin, silicone resin or magnesium-based micropowder.
6. Use of a magnesia-alumina-carbon brick made of a carbonaceous residual ladle lining brick according to any one of claims 1 to 3 in a ladle.
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