CN115093204B - Neutral furnace lining material for smelting nodulizer and inoculant - Google Patents
Neutral furnace lining material for smelting nodulizer and inoculant Download PDFInfo
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- CN115093204B CN115093204B CN202210685532.8A CN202210685532A CN115093204B CN 115093204 B CN115093204 B CN 115093204B CN 202210685532 A CN202210685532 A CN 202210685532A CN 115093204 B CN115093204 B CN 115093204B
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B35/10—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 aluminium oxide
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- 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
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/444—Halide containing anions, e.g. bromide, iodate, chlorite
- C04B2235/445—Fluoride containing anions, e.g. fluosilicate
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
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Abstract
The invention aims to provide a neutral furnace lining material for a smelting nodulizer and an inoculant, which has the advantages of slag hanging prevention, high compressive strength, good mechanical property and long service life. The invention provides a neutral furnace lining material for smelting nodulizer and inoculant, which comprises aggregate and fine powder material, wherein the aggregate comprises 66-88wt% of corundum particles; the fine powder material comprises the following components: 5-15wt% of corundum fine powder, 6-16wt% of alumina powder, 5-20wt% of 1-0mm magnesia and 0.2-1.5wt% of additive, wherein the aggregate and the fine powder material are respectively premixed and mixed together to form a dry powder material for bagging.
Description
Technical Field
The invention relates to the technical field of smelting materials, in particular to a neutral furnace lining material for a smelting nodulizer and an inoculant.
Background
The non-ferrous alloys such as nodulizer, inoculant and cored wire can greatly improve the cast iron and cast steel performances by improving the graphite form, the metal eutectic state and clean molten steel, promoting alloying and the like, and are important cast iron and cast steel auxiliary materials. The alloy mainly comprises silicon, magnesium, rare earth, calcium, barium, strontium, nickel, copper, iron and other alloys, the main components are silicon, magnesium and iron according to different metal component types and contents of different purposes, and the smelting temperature is 1200-1500 ℃ and mainly concentrated at 1300-1400 ℃. The induction furnace is used for smelting nodulizer, inoculant and cored wire alloy materials due to the advantages of high heating speed, uniform component mixing, flexible operation and the like.
The induction furnace lining is divided into three main categories according to the material quality: quartz acidic material, aluminum-magnesium neutral material and magnesium alkaline material. The quartz acid material is mainly used for cast iron and nonferrous metal with lower smelting temperature; the aluminum-magnesium neutral material and the magnesium alkaline material are mainly used for cast steel with higher smelting temperature, wherein the aluminum-magnesium neutral material is mainly used. In view of smelting temperature and cost, quartz acidic materials are mainly used as furnace lining materials in the current market, but high-activity alkaline components in the alloy react with quartz, slag hanging of the furnace lining is serious, repeated furnace disassembly and furnace beating are required, and the problems of high labor cost and time cost, difficult treatment of solid waste and the like exist.
At present, no literature study is made for solving the problem of furnace lining slag hanging for smelting nodulizer inoculant, and it is obvious that the problem of furnace lining slag hanging cannot be essentially solved by analyzing acid materials from the chemical properties of materials. The chemical property of the alkaline material is stable, the problem of slag hanging can be solved, but the alkaline material has poor thermal shock stability, the furnace lining is easy to crack, the service life of the furnace lining is reduced, and the alkaline material has poor reaction expansion and sintering performance at the smelting temperature of 1200-1500 ℃, and the strength of a semi-sintered layer of 900-1000 ℃, thereby influencing the mechanical property of the material as the furnace lining material and reducing the service life of the furnace lining.
Disclosure of Invention
The invention aims to provide a neutral furnace lining material for a smelting nodulizer and an inoculant, which has the advantages of slag hanging prevention, high compressive strength, good mechanical property and long service life.
The technical aim of the invention is realized by the following technical scheme:
the neutral furnace lining material for smelting nodulizer and inoculant comprises aggregate and fine powder material, wherein the aggregate comprises 66-88wt% of corundum particles; the fine powder material comprises the following components: 5-15wt% of corundum fine powder, 6-16wt% of alumina powder, 5-20wt% of 1-0mm magnesia and 0.2-1.5wt% of additive, wherein the aggregate and the fine powder material are respectively premixed and mixed together to form a dry powder material for bagging.
As a further arrangement of the invention, the corundum particles are one or more of brown corundum, white corundum and platy corundum.
As a further arrangement of the invention, the content of the white corundum and the tabular corundum alumina is more than 99 percent, and the content of the brown corundum alumina is more than 95 percent.
As a further arrangement of the invention, in the corundum aggregate, particles with the particle size of 5-3mm are 18-23wt%, the particles with the particle size of 3-1mm account for 20-15wt% of the corundum aggregate, and the particles with the particle size of 1-0mm account for 38-40wt%.
As a further arrangement of the invention, the corundum fine powder is one or more of white corundum and tabular corundum.
As a further setting of the invention, the particle size of the corundum fine powder is <88 μm and the alumina content is >99%.
As a further arrangement of the present invention, the alumina powder is mixed with both of the fine powder a and the fine powder B, wherein the fine powder a has a particle size of <4 μm and the fine powder B has a particle size of <10 μm.
As a further setting of the invention, the magnesia content of the magnesia of 1-0mm is more than 96%.
As a further arrangement of the invention, the additive is aluminium trifluoride.
The beneficial effects of the invention are as follows:
the invention mainly changes the material materials to essentially solve the slag hanging phenomenon, and then solves the problems of low strength at 900-1000 ℃ and poor reaction expansion and sintering performance at 1200-1500 ℃ in the service process of the new material materials by introducing micro powder and using special additives, thereby solving the slag hanging problem and improving the furnace life. On one hand, a large amount of alumina micropowder is used, the particle size of the micropowder is reduced, mass transfer is accelerated, the reaction temperature of spinel is reduced, and the reaction and sintering properties are improved, so that the mechanical properties of the material are improved, and the service life of a furnace lining is prolonged; on the other hand, the special additive is used to promote the reaction and sintering in a liquid phase form at about 900 ℃, so that the material has higher strength after heat treatment at about 900 ℃, and is severely expanded after heat treatment at a temperature above 1200 ℃, thereby improving the compactness and compressive strength of the material under the service constraint condition and inhibiting the generation of cracks. The sintering promoter has the property that the loose layer, the semi-sintering layer and the sintering layer of the furnace lining are obviously distinguished along with the temperature gradient. The semi-sintered layer has higher sintering strength because of no obvious expansion in liquid phase sintering, and provides support protection for the lining body; the expansion of the sintering layer is severe and forms a compact layer under the constraint of the alloy melt static pressure and the furnace body, the expansion of the sintering layer can effectively counteract the volume shrinkage during sintering and furnace lining cooling, the generation of cracks and the penetration of the alloy melt are effectively inhibited, and the service life of the material is prolonged; the aluminum magnesium neutral material has stable chemical property and is not easy to react with high-activity alloy components to generate slag hanging phenomenon, so that the erosion and penetration of melt metal ions are inhibited, the slag hanging problem is effectively solved, the mechanical property of the material is improved, and the service life of the material is prolonged.
Detailed Description
The technical scheme of the present invention will be clearly and completely described in connection with specific embodiments. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
1. Examples
Example 1
The neutral furnace lining material for the smelting nodulizer and the inoculant comprises an aggregate and a fine powder material, wherein the aggregate comprises 18-23wt% of corundum particles with the particle size of 5-3mm, 20-25wt% of corundum particles with the particle size of 3-1mm and 28-35wt% of corundum particles with the particle size of 1-0mm, and the fine powder material comprises the following components: 8-15wt% of corundum fine powder, 2-6wt% of alumina powder A with granularity of less than 4 mu m, 4-8wt% of alumina powder B with granularity of less than 10 mu m, 8-20wt% of 1-0mm magnesia and 0.8-1.5wt% of additive aluminum trifluoride, wherein the aggregate and the fine powder material are respectively premixed and mixed together to form a dry powder material for bagging.
Preferably, the corundum particles are brown corundum.
Preferably, the alumina content of brown alumina is >95%.
Preferably, the corundum fine powder is white corundum.
Preferably, the corundum fine powder has a particle size <88 μm and an alumina content of >99%.
Preferably, the magnesia content of the magnesia with the thickness of 1-0mm is more than 96 percent
Example 2
The neutral furnace lining material for the smelting nodulizer and the inoculant comprises an aggregate and a fine powder material, wherein the aggregate comprises 18-23wt% of corundum particles with the particle size of 5-3mm, 20-25wt% of corundum particles with the particle size of 3-1mm and 28-35wt% of corundum particles with the particle size of 1-0mm, and the fine powder material comprises the following components: 5-10wt% of corundum fine powder, 5-10wt% of alumina powder A with granularity of less than 4 mu m, 6-12wt% of alumina powder B with granularity of less than 10 mu m, 8-20wt% of 1-0mm magnesia and 0.2-0.8wt% of additive aluminum trifluoride, wherein the aggregate and the fine powder material are respectively premixed and mixed together to form a dry powder material for bagging.
Preferably, the corundum particles are white corundum.
Preferably, the white corundum and tabular corundum alumina content is >99%.
Preferably, the corundum fine powder is plate-shaped corundum.
Preferably, the corundum fine powder has a particle size <88 μm and an alumina content of >99%.
Preferably, the magnesia content of the magnesia with the thickness of 1-0mm is more than 96 percent
Example 3
The neutral furnace lining material for the smelting nodulizer and the inoculant comprises an aggregate and a fine powder material, wherein the aggregate comprises 18-23wt% of corundum particles with the particle size of 5-3mm, 20-25wt% of corundum particles with the particle size of 3-1mm and 30-40wt% of corundum particles with the particle size of 1-0mm, and the fine powder material comprises the following components: 5-10wt% of corundum fine powder, 5-10wt% of alumina powder A with granularity of less than 4 mu m, 6-12wt% of alumina powder B with granularity of less than 10 mu m, 5-15wt% of 1-0mm magnesia and 0.8-1.5wt% of additive aluminum trifluoride, wherein the aggregate and the fine powder material are respectively premixed and mixed together to form a dry powder material for bagging.
Preferably, the corundum particles are a mixture of two of white corundum and tabular corundum.
Preferably, the white corundum and tabular corundum alumina content is >99%.
Preferably, the corundum fine powder is a mixture of two of white corundum and platy corundum.
Preferably, the corundum fine powder has a particle size <88 μm and an alumina content of >99%.
Preferably, the magnesia content of the magnesia of 1-0mm is more than 96%.
Example 4
The neutral furnace lining material for the smelting nodulizer and the inoculant comprises an aggregate and a fine powder material, wherein the aggregate comprises 18-23wt% of corundum particles with the particle size of 5-3mm, 20-25wt% of corundum particles with the particle size of 3-1mm and 30-40wt% of corundum particles with the particle size of 1-0mm, and the fine powder material comprises the following components: 8-10wt% of corundum fine powder, 2-6wt% of alumina powder A with granularity of less than 4 mu m, 6-12wt% of alumina powder B with granularity of less than 10 mu m, 5-15wt% of 1-0mm magnesia and 0.2-0.8wt% of additive aluminum trifluoride, wherein the aggregate and the fine powder material are respectively premixed and mixed together to form a dry powder material for bagging.
Preferably, the corundum particles are a mixture of two of white corundum and tabular corundum.
Preferably, the white corundum and tabular corundum alumina content is >99%.
Preferably, the corundum fine powder is a mixture of two of white corundum and platy corundum.
Preferably, the corundum fine powder has a particle size <88 μm and an alumina content of >99%.
Preferably, the magnesia content of the magnesia of 1-0mm is more than 96%.
Example 5
The neutral furnace lining material for the smelting nodulizer and the inoculant comprises an aggregate and a fine powder material, wherein the aggregate comprises 18-23wt% of corundum particles with the particle size of 5-3mm, 20-25wt% of corundum particles with the particle size of 3-1mm and 30-40wt% of corundum particles with the particle size of 1-0mm, and the fine powder material comprises the following components: 8-15wt% of corundum fine powder, 2-6wt% of alumina powder A with granularity of less than 4 mu m, 6-12wt% of alumina powder B with granularity of less than 10 mu m, 5-15wt% of 1-0mm magnesia and no additive, wherein the aggregate and the fine powder material are respectively premixed and mixed together to form a dry powder material, and the dry powder material is packaged.
Preferably, the corundum particles are a mixture of two of white corundum and tabular corundum.
Preferably, the white corundum and tabular corundum alumina content is >99%.
Preferably, the corundum fine powder is a mixture of two of white corundum and platy corundum.
Preferably, the corundum fine powder has a particle size <88 μm and an alumina content of >99%.
Preferably, the magnesia content of the magnesia of 1-0mm is more than 96%.
The neutral furnace lining material prepared in the examples 1-5 is mixed with 1% dextrin powder by a cement mortar mixer for 180S, and then mixed with 3% water for 180S; putting the uniformly mixed materials into a cylindrical mold, and tamping the uniformly mixed materials for 20 times by using a hammer stone sampling machine to prepare cylindrical samples with phi 50 multiplied by 50 mm; the above cylindrical sample was dried at 110℃for 24H, and then calcined at 900℃for 3H, 1200℃for 1500℃for each of them, and the results of measuring radial line change in accordance with GB/T5988-2007, body density in accordance with GB/T2997-2015, and room temperature compressive strength in accordance with GB/T5072-2008 were shown in Table 1 below:
table 1 results of Performance of the samples
The principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present invention and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (8)
1. The neutral furnace lining material for smelting nodulizer and inoculant is characterized by comprising aggregate and fine powder material, wherein the aggregate comprises 66-88wt% of corundum particles; the fine powder material comprises the following components: 5-15wt% of corundum fine powder, 6-16wt% of alumina powder, 5-20wt% of 1-0mm magnesia and 0.2-1.5wt% of additive, wherein the additive is aluminum trifluoride, and the aggregate and the fine powder material are premixed respectively and then mixed together to form a dry powder material to be packaged.
2. The neutral lining material for smelting nodulizer and inoculant according to claim 1, wherein the corundum particles are one or more of brown corundum, white corundum and plate-shaped corundum.
3. The neutral lining material for smelting nodulizer and inoculant according to claim 2, wherein the content of white corundum and plate-shaped corundum alumina is >99% and the content of brown corundum alumina is >95%.
4. The neutral lining material for smelting nodulizer and inoculant according to claim 1, wherein the corundum particles are 18-23wt% of particles with a particle size of 5-3mm, 20-15wt% of particles with a particle size of 3-1mm and 38-40wt% of particles with a particle size of 1-0 mm.
5. The neutral lining material for smelting nodulizer and inoculant according to claim 1, wherein the corundum fine powder is one or more of white corundum and tabular corundum.
6. The neutral lining material for smelting nodulizer and inoculant according to claim 5, wherein the corundum fine powder has a particle size of <88 μm and an alumina content of >99%.
7. The neutral lining material for smelting nodulizer and inoculant according to claim 1, wherein the alumina powder is mixed by two kinds of micro powder A and micro powder B, wherein the granularity of micro powder A is less than 4 μm, and the granularity of micro powder B is less than 10 μm.
8. The neutral lining material for smelting nodulizer and inoculant according to claim 1, wherein the magnesia content of 1-0mm is >96%.
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| WO2021179844A1 (en) * | 2020-03-13 | 2021-09-16 | 武汉科技大学 | Refractory material for smelting titanium aluminum alloy and method for preparation thereof |
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| CN103044045B (en) * | 2013-01-17 | 2014-06-18 | 武汉科技大学 | High-strength aluminum oxide light-weight heat insulation brick and preparation method thereof |
| CN103044048A (en) * | 2013-01-23 | 2013-04-17 | 武汉科技大学 | Aluminum-magnesium lightweight refractory material and preparation method thereof |
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| CN112250424A (en) * | 2020-09-09 | 2021-01-22 | 郑州海赛高技术陶瓷有限责任公司 | Alumina powder, alumina ceramic and preparation method thereof |
| CN113845361A (en) * | 2021-10-29 | 2021-12-28 | 宜兴精新粉体设备科技有限公司 | High-performance alkaline special ceramic and preparation method thereof |
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| JP2000007448A (en) * | 1998-06-16 | 2000-01-11 | Toshiba Ceramics Co Ltd | Ramming material for induction furnace |
| CN109053166A (en) * | 2018-10-23 | 2018-12-21 | 青岛尊龙耐火材料有限公司 | A kind of high-purity high-performance neutrality Dry vibrating material and preparation method thereof and application method |
| WO2021179844A1 (en) * | 2020-03-13 | 2021-09-16 | 武汉科技大学 | Refractory material for smelting titanium aluminum alloy and method for preparation thereof |
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