CN110683851A - Environment-friendly acid furnace lining dry type vibration material - Google Patents
Environment-friendly acid furnace lining dry type vibration material Download PDFInfo
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Abstract
The invention relates to the technical field of acid furnace lining refractory materials, in particular to an environment-friendly acid furnace lining dry vibration material which comprises the following raw materials in parts by weight: 15-20% of waste silica brick particles with the particle size of 5-8 mm, 8-15% of waste silica brick particles with the particle size of 3-5 mm, 18-25% of waste silica brick particles with the particle size of 1-3 mm, 25-33% of waste silica brick particles with the particle size of 0-1 mm, 25-30% of 325-mesh high-quality natural silica sand powder, B2O31-2% of special sintering agent, and 0.1-0.3% of special sintering agent, wherein the main chemical components comprise the following components in percentage by mass: SiO 22≥97.5％、Al2O3≤0.5％、Fe2O3≤0.6％、CaO≤0.8％、MgO≤0.16％、TiO2Not more than 0.09%, not more than 0.1% of alkali metal oxide, H2O is less than or equal to 0.5 percent, the invention takes the regenerated waste silica brick particles as raw materials, and simultaneously adds natural quartz powder and sintering agent, thereby improving the sintering strength, having small thermal expansion coefficient, greatly prolonging the service life of the furnace lining, simultaneously reasonably utilizing the domestic huge waste silica brick resources, saving the cost of raw materials and realizing the recycling of resources.
Description
Technical Field
The invention relates to the technical field of acid furnace lining refractory materials, in particular to an environment-friendly acid furnace lining dry vibration material.
Background
The coreless induction furnace is a melting device which is developed rapidly and has wide application at present, and is widely used for casting and producing steel and non-ferrous alloys. How to prolong the service life of the lining of the induction furnace and reduce the cost of charging materials is a common concern in the casting industry at present. Factors influencing the service life of the furnace lining are many, and include the performance of the furnace lining material, the technical level of an operator, the equipment quality of the induction furnace, the execution degree of the field smelting process, the quality of raw materials and the like. The performance of the furnace lining material is the primary factor influencing the service life of the furnace lining, and comprises the factors of particle composition of the furnace lining material, raw material sorting, sintering agent quality and the like. The lining material, such as dry vibrating material, is made of refractory aggregate, powder, sintering agent and additive, and through the sliding between grains and fine powder, compact and homogeneous monolithic refractory material is formed without adding water or liquid adhesive and heated with thermosetting adhesive or ceramic sintering agent to produce strength.
① has high refractoriness, the refractoriness should be larger than 1650-1700 ℃, the refractoriness under load should be larger than 1650- ② has enough sintering strength, because the wall of the induction furnace is relatively thin, it needs to bear the mechanical impact of the metal liquid and the material block when charging, ③ has stable chemical components, it does not react with the material in the furnace, ④ has small electric and heat conductivity, to ensure good electric insulation at high temperature, to ensure safe production, the thermal expansion coefficient of ⑤ furnace lining should be small as much as possible, the thermal stability is good, it can be suitable for the production environment of rapid cooling and rapid heating.
Currently, advanced induction furnace manufacturing companies in the world generally use lining materials produced in sweden, the united states, spain, and other countries. With the gradual increase of the import induction furnaces in China, the cost for purchasing lining materials is high every year. At present, natural quartz sand is basically adopted as a raw material for acid dry-type vibration materials of domestic induction furnaces, the quartz sand has a plurality of crystal forms and complicated changes, great volume expansion can be generated in the temperature rising process, the problem can be relieved only by adding a certain amount of sintering agent, however, the high-temperature fire resistance of the materials is often reduced by adding a large amount of sintering agent, and the problem becomes a main reason influencing the service life of the lining of the induction furnace. How to reasonably utilize the recycled resources and make up the inherent defects of the existing materials becomes a big subject in the field of the service life of the lining of the induction furnace.
Disclosure of Invention
The invention aims to provide an environment-friendly acid furnace lining dry vibrating material aiming at the defects of large volume expansion, easy crack formation, unstable service life and the like of the traditional acid furnace lining dry vibrating material when in use.
The technical scheme adopted by the invention for solving the technical problems is as follows: the environment-friendly acid furnace lining dry vibration material comprises the following raw materials in parts by weight: 15-20% of waste silica brick particles with the particle size of 5-8 mm, 8-15% of waste silica brick particles with the particle size of 3-5 mm, 18-25% of waste silica brick particles with the particle size of 1-3 mm, 25-33% of waste silica brick particles with the particle size of 0-1 mm, 25-30% of 325-mesh high-quality natural silica sand powder, B2O31-2% of special sintering agent, and 0.1-0.3% of special sintering agent, wherein the main chemical components comprise the following components in percentage by mass: SiO 22≥97.5％、Al2O3≤0.5％、Fe2O3≤0.6％、CaO≤0.8％、MgO≤0.16％、TiO2Not more than 0.09%, not more than 0.1% of alkali metal oxide, H2O≤0.5％。
Preferably, the environment-friendly acid furnace lining dry vibration material comprises the following raw materials in parts by weight: 15-18% of waste silica brick particles with the particle size of 5-8 mm, 8-11% of waste silica brick particles with the particle size of 3-5 mm, 18-20% of waste silica brick particles with the particle size of 1-3 mm, 25-30% of waste silica brick particles with the particle size of 0-1 mm, 25-28% of 325-mesh high-quality natural silica sand powder, B2O31-2% and 0.1-0.3% of special sintering agent.
Preferably, the environment-friendly acid furnace lining dry vibration material comprises the following raw materials in parts by weight: 15% of waste silica brick particles with the particle size of 5-8 mm, 8% of waste silica brick particles with the particle size of 3-5 mm, 18.7% of waste silica brick particles with the particle size of 1-3 mm, 28% of waste silica brick particles with the particle size of 0-1 mm, 28% of 325-mesh high-quality natural quartz sand powder, B2O32 percent; the special sintering agent is 0.3 percent.
Preferably, the special sintering agent is industrial limestone fine powder, wherein CaCO3≥95％。
The invention has the beneficial effects that: environment-friendly acid furnaceThe lining-type vibrating material comprises the following raw materials in parts by mass: 15-20% of waste silica brick particles with the particle size of 5-8 mm, 8-15% of waste silica brick particles with the particle size of 3-5 mm, 18-25% of waste silica brick particles with the particle size of 1-3 mm, 25-33% of waste silica brick particles with the particle size of 0-1 mm, 25-30% of 325-mesh high-quality natural silica sand powder, B2O31-2% of special sintering agent, and 0.1-0.3% of special sintering agent, wherein the main chemical components comprise the following components in percentage by mass: SiO 22≥97.5％、Al2O3≤0.5％、Fe2O3≤0.6％、CaO≤0.8％、MgO≤0.16％、TiO2Not more than 0.09%, not more than 0.1% of alkali metal oxide, H2O is less than or equal to 0.5 percent, the invention takes the regenerated waste silica brick particles as raw materials, and simultaneously adds natural quartz powder and sintering agent, thereby improving the sintering strength, having small thermal expansion coefficient, greatly prolonging the service life of the furnace lining, simultaneously reasonably utilizing the domestic huge waste silica brick resources, saving the cost of raw materials and realizing the recycling of resources.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the scope of the present invention is not limited thereto.
The environment-friendly acid furnace lining dry vibration material of the embodiment is characterized in that: the composite material comprises the following raw materials in parts by weight: 15-20% of waste silica brick particles with the particle size of 5-8 mm, 8-15% of waste silica brick particles with the particle size of 3-5 mm, 18-25% of waste silica brick particles with the particle size of 1-3 mm, 25-33% of waste silica brick particles with the particle size of 0-1 mm, 25-30% of 325-mesh high-quality natural silica sand powder, B2O31-2% of special sintering agent, and 0.1-0.3% of special sintering agent, wherein the main chemical components comprise the following components in percentage by mass: SiO 22≥97.5％、Al2O3≤0.5％、Fe2O3≤0.6％、CaO≤0.8％、MgO≤0.16％、TiO2Not more than 0.09%, not more than 0.1% of alkali metal oxide, H2O≤0.5％。
In order to achieve the best use performance, the environment-friendly acid furnace lining dry-type vibration material comprises the following raw materials in parts by weight: 15-18% of waste silicon brick particles with the particle size of 5-8 mm, 8-11% of waste silicon brick particles with the particle size of 3-5 mm and 18-20% of waste silicon brick particles with the particle size of 1-3 mm25-30% of waste silicon brick particles with the particle size of 0-1 mm, 25-28% of 325-mesh high-quality natural quartz sand powder, and B2O31-2% and 0.1-0.3% of special sintering agent.
The grain size ratio has important influence on the bulk density, mechanical strength and sintering performance of the lining material. The invention selects waste silica brick particles as raw materials, calculates according to the Anderson close packing equation and according to a large amount of experimental data, and forms the unique particle proportion.
The environment-friendly acid furnace lining dry vibration material is prepared by the steps of mineral separation, coarse crushing, material washing, fine crushing, screening, detection, drying, detection, batching, mixing, inspection, packaging and the like. The bulk material volume density of the product is detected to be more than or equal to 1.8g/cm3The volume density of the lining layer is more than or equal to 2.1g/cm3Particle size Dmax≤8.1mm。
The invention has the advantages that: firstly, because the high-quality silica bricks which are stable in chemical components and are recovered after being used in a coke oven are adopted, the silica brick particles which are obtained by mineral separation, coarse crushing, material washing, fine crushing, screening, detection and drying are used as aggregates, and B is added2O3And the special sintering agent can form a solid solution structure at high temperature, so that the volume expansion of the furnace lining at high temperature is greatly reduced, the strength of the furnace lining at high temperature is higher, and the service life of the furnace lining is prolonged.
Secondly, through the prior research on the product particle composition, a unique particle proportion is formed, and the reasonable particle size distribution improves the volume density, the compressive strength and the porosity of the material, so that the mechanical strength and the compactness of the furnace lining are improved, the molten iron erosion resistance of the furnace lining is stronger, the service life of the furnace lining is prolonged, and the production cost is reduced.
Thirdly, the waste silica brick particles used in the invention have the characteristics of extremely low linear expansion coefficient, better thermal shock resistance, low thermal conductivity and the like, not only improve the compactness of the lining body, but also improve the thermal shock resistance of the lining, are more suitable for the process characteristics that an electric induction furnace is started and stopped at any time, and are well received by customers.
The waste silica bricks used in the invention are recycled materials, so that the problem of recycling treatment of huge quantities of used silica bricks in steel production is solved, and the method has extremely high economic and social benefits.
One specific embodiment: the environment-friendly acid furnace lining dry vibration material comprises the following raw materials in parts by weight: 15% of waste silica brick particles with the particle size of 5-8 mm, 8% of waste silica brick particles with the particle size of 3-5 mm, 18.7% of waste silica brick particles with the particle size of 1-3 mm, 28% of waste silica brick particles with the particle size of 0-1 mm, 28% of 325-mesh high-quality natural quartz sand powder, B2O32 percent; the special sintering agent is 0.3 percent. The special sintering agent is industrial limestone fine powder, wherein CaCO3≥95％。
The main performances of the product of the embodiment are compared with those of the united states mineral company as follows:
| product performance parameter names | Product of United states mineral company | This example | |
| 1 | SiO2 | 97.72％ | 98.26％ |
| 2 | Al2O3 | 0.84％ | 0.42％ |
| 3 | Fe2O3 | 0.13％ | 0.11％ |
| 4 | H2O | 0.23％ | 0.25％ |
| 5 | Degree of refractoriness | 1723℃ | 1740℃ |
| 6 | Bulk density | 1.76g/cm3 | 1.83g/cm3 |
| 7 | Knot density | 2.17g/cm3 | 2.18g/cm3 |
| 8 | Service life (5t melting furnace) | 134 furnace | 161 furnace |
| 9 | Thermal expansion (1000 ℃ C.) | 1.26％ | 0.44％ |
| 10 | Breaking strength at 1550 ℃ for 1h | ≥4.2MPa | ≥4.8MPa |
| 11 | Compression strength at 1550 ℃ for 1h | ≥7.4MPa | ≥8.6MPa |
The detection data show that the thermal expansion (1000 ℃) of the product is lower than that of the similar product of the United states mineral company, so that the volume expansion generated in the using process is smaller, and the furnace lining is not easy to form cracks; SiO of the product of the invention2The content of the product is higher than that of the similar product of United states United mineral company, so the product of the invention has better refractoriness; al in the product of the invention2O3、Fe2O3The content of the same impurities is lower than that of the similar products of the United states Union mine company, and the oxide and SiO are reduced at high temperature2The reaction generates a low-melting-point compound, so that the service life of a furnace lining is influenced, and the product has longer service life; due to the optimization of a sintering system, the flexural strength, the compressive strength and other properties of the product are superior to those of similar products of United states mineral company.
In addition, China is a big country for producing silica bricks, most of the waste silica bricks detached and replaced from various kilns every year cannot be well utilized and can only be discarded at will, so that great resource waste is caused.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (4)
1. Environment-friendly acid furnace lining dry vibration materialIs characterized in that: the composite material comprises the following raw materials in parts by weight: 15-20% of waste silica brick particles with the particle size of 5-8 mm, 8-15% of waste silica brick particles with the particle size of 3-5 mm, 18-25% of waste silica brick particles with the particle size of 1-3 mm, 25-33% of waste silica brick particles with the particle size of 0-1 mm, 25-30% of 325-mesh high-quality natural silica sand powder, B2O31-2% of special sintering agent, and 0.1-0.3% of special sintering agent, wherein the main chemical components comprise the following components in percentage by mass: SiO 22≥97.5％、Al2O3≤0.5％、Fe2O3≤0.6％、CaO≤0.8％、MgO≤0.16％、TiO2Not more than 0.09%, not more than 0.1% of alkali metal oxide, H2O≤0.5％。
2. The environment-friendly acid furnace lining dry vibration material as claimed in claim 1, wherein: the composite material comprises the following raw materials in parts by weight: 15-18% of waste silica brick particles with the particle size of 5-8 mm, 8-11% of waste silica brick particles with the particle size of 3-5 mm, 18-20% of waste silica brick particles with the particle size of 1-3 mm, 25-30% of waste silica brick particles with the particle size of 0-1 mm, 25-28% of 325-mesh high-quality natural silica sand powder, B2O31-2% and 0.1-0.3% of special sintering agent.
3. The environment-friendly acid furnace lining dry vibration material as claimed in claim 2, wherein: the composite material comprises the following raw materials in parts by weight: 15% of waste silica brick particles with the particle size of 5-8 mm, 8% of waste silica brick particles with the particle size of 3-5 mm, 18.7% of waste silica brick particles with the particle size of 1-3 mm, 28% of waste silica brick particles with the particle size of 0-1 mm, 28% of 325-mesh high-quality natural quartz sand powder, B2O32 percent; the special sintering agent is 0.3 percent.
4. The environment-friendly acid furnace lining dry vibration material as claimed in claim 1, wherein: the special sintering agent is industrial limestone fine powder, wherein CaCO3≥95％。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111675544A (en) * | 2020-05-26 | 2020-09-18 | 襄阳聚力新材料科技有限公司 | Acid furnace lining material for ultra-high temperature environment and preparation method thereof |
| CN111875396A (en) * | 2020-07-28 | 2020-11-03 | 中国一冶集团有限公司 | Preparation method of dry material for stainless steel smelting intermediate frequency furnace lining |
| CN113213952A (en) * | 2021-04-22 | 2021-08-06 | 武汉钢铁有限公司 | Environment-friendly tundish dry material and preparation method thereof |
| CN114031413A (en) * | 2022-01-10 | 2022-02-11 | 尊龙新材料(山东)有限公司 | Production method of acid dry-vibration furnace lining special for metal silicon smelting |
| CN114890799A (en) * | 2022-04-26 | 2022-08-12 | 山东耐火材料集团有限公司 | Special-shaped and large-sized silica brick and production method thereof |
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| CN111875396B (en) * | 2020-07-28 | 2022-08-19 | 中国一冶集团有限公司 | Preparation method of dry material for stainless steel smelting intermediate frequency furnace lining |
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