CN110818393A - Preparation method of magnesia spinel recycled brick for RH furnace - Google Patents
Preparation method of magnesia spinel recycled brick for RH furnace Download PDFInfo
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- CN110818393A CN110818393A CN201911265463.XA CN201911265463A CN110818393A CN 110818393 A CN110818393 A CN 110818393A CN 201911265463 A CN201911265463 A CN 201911265463A CN 110818393 A CN110818393 A CN 110818393A
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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
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Environmental & Geological Engineering (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
Abstract
The invention discloses a preparation method of a magnesia spinel recycled brick for an RH furnace, which comprises the following processing steps: s110, preparing aggregate, namely preparing magnesium spinel brick aggregate by using the recycled magnesium spinel brick, and mixing fused magnesia particles to obtain primary aggregate; s120, preparing premixed powder, namely mixing the fused magnesia fine powder, the magnesia-alumina spinel fine powder, the special additive and the antioxidant to form the premixed powder; s130, mixing raw materials, namely sequentially adding the primary aggregate prepared in the step S110 and the premixed powder prepared in the step S120 into a mixing mill, mixing and milling at a low speed for 2-3min, adding an additional binding agent, mixing and milling at a low speed for 5-8min, and then mixing and milling at a high speed for 15-20min to obtain a mixture; s140, molding; and S150, drying. Has the advantages that: by adopting the preparation method, a large amount of regenerated waste can be used in the production process of the refractory product, the production cost is low, the environmental protection performance is good, and the service performance of the product is good.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a preparation method of a magnesium spinel recycled brick for an RH furnace.
Background
Along with the increase of the environmental protection treatment intensity, the supply of ore resources, namely refractory raw material sources, is short, the price of the refractory raw materials is rapidly increased, huge cost and operation pressure are caused to refractory product production enterprises, and the whole production and operation order of the refractory material industry is seriously influenced. In order to reduce the production cost of refractory products, recycling of waste products is a priority. In the prior art, the research on the recycling of the magnesia spinel brick for the RH furnace is less, and compared with the magnesia spinel brick product made of pure raw materials, the magnesia spinel brick made of recycled materials has relatively low service life and poor stability, so that the research in the direction is trapped in a dilemma. Based on the reasons, the applicant designs a preparation process which takes the recycled RH furnace magnesium spinel brick as a main raw material and improves the high-temperature performance and the quality stability of the magnesium spinel brick by adding a modifier.
Disclosure of Invention
The invention aims to solve the problems and provide a preparation method of a magnesium spinel recycled brick for an RH furnace, and the preferable technical scheme in the technical schemes provided by the invention comprises the following steps: the magnesia spinel brick prepared by the magnesia spinel reclaimed material for the RH furnace has the technical effects of good medium-high temperature strength, good heat rash stability, good alkaline slag corrosion resistance and the like, and is explained in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a preparation method of a magnesium spinel recycled brick for an RH furnace, which comprises the following processing steps:
s110, preparing aggregate, namely preparing magnesium spinel brick aggregate by using the recycled magnesium spinel brick, and mixing fused magnesia particles to obtain primary aggregate;
s120, preparing premixed powder, namely mixing the fused magnesia fine powder, the magnesia-alumina spinel fine powder, the special additive and the antioxidant to form the premixed powder;
s130, mixing raw materials, namely sequentially adding the primary aggregate prepared in the step S110 and the premixed powder prepared in the step S120 into a mixing mill, mixing and milling at a low speed for 2-3min, adding an additional binding agent, mixing and milling at a low speed for 5-8min, and then mixing and milling at a high speed for 15-20min to obtain a mixture;
s140, forming, namely taking out the mixture obtained in the step S130, putting the mixture into a green brick making machine to make green bricks, wherein the density of the formed green bricks is 3.10-3.20g/cm3；
S150, drying the formed green brick at the temperature of 180-220 ℃ for 24h to obtain the magnesia spinel brick for the RH furnace.
Preferably, the aggregate in the step S110 is prepared by selecting, crushing, hydrating, drying, rolling and screening RH magnesia spinel reclaimed materials; wherein the weight of each granularity accounts for the total weight of the mixture in the following proportion: 10% -30% of granularity 3-5mm, 10% -30% of granularity 1-3mm and 10% -25% of granularity 0-1 mm; the fused magnesia particles with the granularity of 5-8mm account for 5-15% of the weight of the mixture.
Preferably, the proportions of the components in the premixed powder material in the total weight of the mixture are as follows: 10 to 25 percent of fused magnesia fine powder with the granularity of 0.044mm, 5 to 15 percent of magnesia-alumina spinel fine powder with the granularity of 3 to 5 microns, 3.5 to 8 percent of special additive and 1 to 5 percent of antioxidant additive.
Preferably, the special additive comprises 0.5-1% of boron carbide fine powder with the particle size of 5 mu m, 2-5% of nano-grade silicon micro powder and 1-2% of calcined alumina micro powder with the particle size of 5 mu m, and the weight ratio of the three components is 0.5-1: 2-5: 1-2.
Preferably, the magnesia content of the magnesia-alumina spinel is 45-65%, the magnesia content of the 0.044mm fused magnesia fine powder is more than 96%, and the alumina content of the calcined alumina fine powder is more than 99%.
Preferably, the antioxidant additive is one or a mixture of two of metal silicon powder and metal aluminum powder.
Preferably, in step S130, the additional binder is a modified phenolic resin.
In conclusion, the beneficial effects of the invention are as follows: the aluminum oxide and the silicon oxide are formed by self-oxidation under the high-temperature oxidation environment by adding the metal aluminum powder and the silicon powder in the waste treatment process of the magnesia spinel brick for the RH furnace, so that the surface air holes of the product are sealed, the surface compactness of the product is improved, and the slag corrosion resistance of the regenerated magnesia spinel brick is improved;
the magnesia-rich spinel magnesite grains with 45-65% of MgO content are added to react with high-activity alumina micro powder, oxidation products after oxidation of metal antioxidants and the like again to generate secondary spinel and forsterite to form a compact protective layer, so that the thermal state strength of the product is improved, and the oxidation resistance of the product is enhanced;
the boron carbide and the silicon carbide micro powder are added to form a net structure when the product is used at high temperature, so that the strength of a resin carbon chain of a binding agent of the product is enhanced, and the spalling resistance and the high-temperature breaking strength of the product are enhanced;
by adopting the preparation method, a large amount of regenerated waste can be used in the production process of the refractory product, the production cost is low, the environmental protection performance is good, and the service performance of the product is good.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention provides a preparation method of a magnesium spinel recycled brick for an RH furnace, which comprises the following processing steps:
s110, preparing aggregate, namely preparing magnesium spinel brick aggregate by using the recycled magnesium spinel brick, mixing fused magnesia particles to obtain primary aggregate, and selecting, crushing, hydrating, drying, rolling and screening the aggregate by adopting RH furnace magnesium spinel reclaimed materials; wherein the weight of each granularity accounts for the total weight of the mixture in the following proportion: 10% -30% of granularity 3-5mm, 10% -30% of granularity 1-3mm and 10% -25% of granularity 0-1 mm; the fused magnesia particles with the granularity of 5-8mm account for 5-15% of the weight of the mixture;
s120, preparing premixed powder, mixing the fused magnesia fine powder, the magnesia-alumina spinel fine powder, the special additive and the antioxidant to form the premixed powder, wherein the premixed powder comprises the following components in percentage by weight of the total weight of the mixture: 10 to 25 percent of fused magnesia fine powder with the granularity of 0.044mm, 5 to 15 percent of magnesia-alumina spinel fine powder with the granularity of 3 to 5 mu m, 3.5 to 8 percent of special additive and 1 to 5 percent of antioxidant additive; the special additive comprises 0.5-1% of boron carbide fine powder with the granularity of 5 mu m, 2-5% of nano-silicon micro powder and 1-2% of calcined alumina micro powder with the granularity of 5 mu m, and the weight ratio of the three components is 0.5-1: 2-5: 1-2; the content of magnesium oxide in the magnesia-alumina spinel is 45-65%, the content of magnesium oxide in 0.044mm fused magnesia fine powder is more than 96%, and the content of aluminum oxide in calcined alumina micro powder is more than 99%; the antioxidant additive is one or a mixture of two of metal silicon powder and metal aluminum powder;
s130, mixing raw materials, namely sequentially adding the primary aggregate prepared in the step S110 and the premixed powder prepared in the step S120 into a mixing mill, mixing and milling at a low speed for 2-3min, adding an additional binding agent, mixing and milling at a low speed for 5-8min, and then mixing and milling at a high speed for 15-20min to obtain a mixture, wherein the additional binding agent is modified phenolic resin;
s140, forming, namely taking out the mixture obtained in the step S130, putting the mixture into a green brick making machine to make green bricks, wherein the density of the formed green bricks is 3.10-3.20g/cm3；
S150, drying the formed green brick at the temperature of 180-220 ℃ for 24h to obtain the magnesia spinel brick for the RH furnace.
By adopting the preparation method and changing the mixture ratio, as 6 examples, a certain brand RH magnesium spinel brick sold on the market is taken as a comparative example, the RH magnesium spinel brick comprises 85% of fused magnesia, 5% of metal antioxidant, 0.5% of B4C3 fine powder and 10% of magnesium aluminate spinel, and the bonding agent adopts phenolic resin, and the adding amount is 3.0%. The results of comparison are shown in tables 1 and 2.
Table 1:
table 2:
the magnesium spinel brick for the RH furnace prepared by adopting the raw material proportion in the embodiment has the service life of 92-98 times when being refined and used in the RH furnace, has basically the same use effect with 95 times of the magnesium spinel brick as the primary material in the comparative example, and has good stability in the use process.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A preparation method of a magnesia spinel recycled brick for an RH furnace is characterized by comprising the following processing steps:
s110, preparing aggregate, namely preparing magnesium spinel brick aggregate by using the recycled magnesium spinel brick, and mixing fused magnesia particles to obtain primary aggregate;
s120, preparing premixed powder, namely mixing the fused magnesia fine powder, the magnesia-alumina spinel fine powder, the special additive and the antioxidant to form the premixed powder;
s130, mixing raw materials, namely sequentially adding the primary aggregate prepared in the step S110 and the premixed powder prepared in the step S120 into a mixing mill, mixing and milling at a low speed for 2-3min, adding an additional binding agent, mixing and milling at a low speed for 5-8min, and then mixing and milling at a high speed for 15-20min to obtain a mixture;
s140, forming, namely taking out the mixture obtained in the step S130, putting the mixture into a green brick making machine to make green bricks, wherein the density of the formed green bricks is 3.10-3.20g/cm3；
S150, drying the formed green brick at the temperature of 180-220 ℃ for 24h to obtain the magnesia spinel brick for the RH furnace.
2. The preparation method of the magnesium spinel recycled brick for the RH furnace according to claim 1, which is characterized in that: the aggregate in the step S110 is prepared by selecting, crushing, hydrating, drying, grinding and screening RH furnace magnesium spinel reclaimed materials; wherein the weight of each granularity accounts for the total weight of the mixture in the following proportion: 10% -30% of granularity 3-5mm, 10% -30% of granularity 1-3mm and 10% -25% of granularity 0-1 mm; the fused magnesia particles with the granularity of 5-8mm account for 5-15% of the weight of the mixture.
3. The preparation method of the magnesium spinel recycled brick for the RH furnace according to claim 1, which is characterized in that: the proportion of each component in the premixed powder material in the total weight of the mixture is as follows: 10 to 25 percent of fused magnesia fine powder with the granularity of 0.044mm, 5 to 15 percent of magnesia-alumina spinel fine powder with the granularity of 3 to 5 microns, 3.5 to 8 percent of special additive and 1 to 5 percent of antioxidant additive.
4. The preparation method of the magnesium spinel recycled brick for the RH furnace according to claim 3, wherein the preparation method comprises the following steps: the special additive comprises 0.5-1% of boron carbide fine powder with the granularity of 5 mu m, 2-5% of nano-silicon micro powder and 1-2% of calcined alumina micro powder with the granularity of 5 mu m, and the weight ratio of the three components is 0.5-1: 2-5: 1-2.
5. The preparation method of the magnesium spinel recycled brick for the RH furnace according to claim 3, wherein the preparation method comprises the following steps: the magnesia content of the magnesia-alumina spinel is 45-65%, the magnesia content of the fused magnesia fine powder with the diameter of 0.044mm is more than 96%, and the alumina content of the calcined alumina micro powder is more than 99%.
6. The preparation method of the magnesium spinel recycled brick for the RH furnace according to claim 3, wherein the preparation method comprises the following steps: the antioxidant additive is one or a mixture of two of metal silicon powder and metal aluminum powder.
7. The preparation method of the magnesium spinel recycled brick for the RH furnace according to claim 1, which is characterized in that: in the step S130, the additional bonding agent is modified phenolic resin.
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| CN201911265463.XA CN110818393A (en) | 2019-12-11 | 2019-12-11 | Preparation method of magnesia spinel recycled brick for RH furnace |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112047746A (en) * | 2020-08-10 | 2020-12-08 | 辽宁东和新材料股份有限公司 | Baking-free magnesia-alumina spinel brick for RH dip pipe and preparation method thereof |
| CN114180954A (en) * | 2022-02-15 | 2022-03-15 | 北京利尔高温材料股份有限公司 | Environment-friendly low-carbon aluminum-magnesium spinel brick and preparation method thereof |
| CN114394820A (en) * | 2021-12-29 | 2022-04-26 | 北京金隅通达耐火技术有限公司 | Magnesia-alumina spinel sintered by waste magnesia-alumina brick powder and preparation method thereof |
| CN114573324A (en) * | 2022-03-01 | 2022-06-03 | 武汉钢铁有限公司 | RH vacuum furnace lining refractory material and preparation method thereof |
| JP7139497B1 (en) | 2021-07-20 | 2022-09-20 | 株式会社ヨータイ | How to recycle used magnesia spinel refractories |
| CN115403302A (en) * | 2022-08-31 | 2022-11-29 | 湖南湘钢瑞泰科技有限公司 | Regenerated wall brick and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112047746A (en) * | 2020-08-10 | 2020-12-08 | 辽宁东和新材料股份有限公司 | Baking-free magnesia-alumina spinel brick for RH dip pipe and preparation method thereof |
| JP7139497B1 (en) | 2021-07-20 | 2022-09-20 | 株式会社ヨータイ | How to recycle used magnesia spinel refractories |
| JP2023015789A (en) * | 2021-07-20 | 2023-02-01 | 株式会社ヨータイ | Recycling method for used magnesia spinel refractory |
| CN114394820A (en) * | 2021-12-29 | 2022-04-26 | 北京金隅通达耐火技术有限公司 | Magnesia-alumina spinel sintered by waste magnesia-alumina brick powder and preparation method thereof |
| CN114394820B (en) * | 2021-12-29 | 2022-11-08 | 北京金隅通达耐火技术有限公司 | Magnesia-alumina spinel sintered by waste magnesia-alumina brick powder and preparation method thereof |
| CN114180954A (en) * | 2022-02-15 | 2022-03-15 | 北京利尔高温材料股份有限公司 | Environment-friendly low-carbon aluminum-magnesium spinel brick and preparation method thereof |
| CN114180954B (en) * | 2022-02-15 | 2022-05-17 | 北京利尔高温材料股份有限公司 | Environment-friendly low-carbon aluminum-magnesium spinel brick and preparation method thereof |
| CN114573324A (en) * | 2022-03-01 | 2022-06-03 | 武汉钢铁有限公司 | RH vacuum furnace lining refractory material and preparation method thereof |
| CN115403302A (en) * | 2022-08-31 | 2022-11-29 | 湖南湘钢瑞泰科技有限公司 | Regenerated wall brick and preparation method thereof |
| CN115403302B (en) * | 2022-08-31 | 2024-02-13 | 湖南湘钢瑞泰科技有限公司 | Regenerated wall brick and preparation method thereof |
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