阅读说明：本技术 高性能镁质滑板砖及其制备方法 (High-performance magnesium sliding brick and preparation method thereof ) 是由 杭文明 王远林 于 2019-06-25 设计创作，主要内容包括：本发明公开了高性能镁质滑板砖,按重量百分含量计,包含以下组分：97电熔镁砂47％～54％、镁橄榄石7％～9％、电熔尖晶石12％～18％、高温促烧粉4％～6％、陶瓷塑粘剂5％～8％、含碳粉1％～3％、石墨1％～3％、碳化硼1％～3％、铝镁合金粉4％～6％、硅粉2％～4％、上述配方中所有组分重量之和为100％,外加树脂4％～5％,树脂增强剂0.4％～0.5％。本发明的目的在于提供了一种具有浇铸钙处理钢和高氧钢、低碳优质钢开辟了行业新领域,解决了多家钢厂滑板寿命低、耐材吨钢消耗量大的问题,同时为钢厂节约成本、减少资源浪费,降本增效显著的高性能镁质滑板砖及其制备方法。(The invention discloses a high-performance magnesium sliding brick, which comprises the following components in percentage by weight: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent. The invention aims to provide a high-performance magnesium sliding plate brick which is cast with calcium-treated steel, high-oxygen steel and low-carbon high-quality steel, opens up a new industrial field, solves the problems of short service life of sliding plates and high consumption of refractory steel per ton in a plurality of steel mills, saves cost for the steel mills, reduces resource waste, and has obvious cost reduction and efficiency improvement, and a preparation method thereof.)

1. The high-performance magnesium sliding brick is characterized by comprising the following components in percentage by weight: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent.

2. The high performance magnesium slide plate brick according to claim 1, wherein the grain composition of each component is: 97 (3-1, 2-1, 1-0.5 mm) fused magnesite grain diameter and more than or equal to 200 meshes, 1-0 mm of forsterite grain diameter, 0.5-0 mm of fused spinel grain diameter, more than or equal to 200 meshes of high-temperature burning promoting powder, more than or equal to 180 meshes of ceramic plastic binder, 325 meshes of carbon-containing powder, 325 meshes of graphite, more than or equal to 180 meshes of boron carbide, more than or equal to 180 meshes of aluminum-magnesium alloy powder and more than or equal to 180 meshes of silicon powder, and the resin reinforcing agent are liquid.

3. The high-performance magnesia slide brick according to claim 2, wherein the 97 fused magnesia has a grain composition in weight percent:

4. the high performance magnesia slide brick of claim 3 wherein the sum of the grain composition weight percentages of 97% fused magnesia by weight is 35-38%.

5. The high performance magnesium slide plate brick according to claim 4 wherein 97 fused magnesite: the MgO content is more than or equal to 97 percent, and the content of the forsterite is as follows: sThe content of iO2 is less than or equal to 40 percent, the content of MgO is more than or equal to 45 percent, the content of the electric melting spinel is as follows: al (Al)₂O₃The content is more than or equal to 72 percent, the MgO content is more than or equal to 21 percent, and the high-temperature sintering promoting powder comprises the following components in percentage by weight: SiO2 content is less than or equal to 30 percent, Al₂O₃The content is more than or equal to 72 percent, and the ceramic plastic adhesive comprises the following components in percentage by weight: bulk density of about 450g/L, carbon-containing powder: the content of residual carbon is 85%, and the ratio of graphite: the content of C is more than or equal to 97 percent, and the content of boron carbide is as follows: the content of B4C is more than or equal to 90 percent, the aluminum magnesium alloy powder: the Al content is 50 +/-3%, the active metal (Al + Mg) is not less than 97.0%, and the silicon powder: the content of Si is more than or equal to 97 percent, and the weight percentage of the resin is as follows: the residual carbon content is 45 +/-4%, the solid content is 75-80%, and the viscosity is 15000-18000 mpa.

6. The preparation method of the high-performance magnesium sliding brick according to claim 1, wherein 97 electric melting magnesite, forsterite, electric melting spinel, high-temperature burning promoting powder, ceramic plastic adhesive, carbon-containing powder, graphite, boron carbide, aluminum-magnesium alloy powder, silicon powder, resin and resin reinforcing agent are mixed in proportion, then the mixture is molded and naturally dried, then the mixture is put into a drying kiln to be slowly heated and dried for 40-60 hours, the temperature of the drying kiln is preferably not more than 180-190 ℃, then the mixture is pushed into a medium-high temperature tunnel kiln to be uniformly heated to 580 +/-20 ℃, the temperature is kept for 15-20 hours, and finally the temperature is uniformly reduced for 16-25 hours.

7. The method of claim 6, wherein the temperature of the kiln is uniformly raised to 80 ℃ within 1 hour and maintained at 80 ℃ for 12 hours, and then the temperature is uniformly raised from 80 ℃ to 190 ℃ within 24 hours and maintained at 190 ℃ for 20 hours.

8. The preparation method of the high-performance magnesium sliding brick according to claim 7, wherein the temperature is uniformly increased to 580 ℃ ± 20 ℃ within 15-20 hours, and finally the temperature is reduced at a constant speed for 20 hours.

Technical Field

The invention relates to the field of inorganic non-metallic refractory materials using aluminum oxide, magnesium oxide and carbon as base materials, in particular to a high-performance magnesium sliding plate brick and a preparation method thereof.

Background

At present, the domestic sliding plates mainly comprise aluminum-zirconium-carbon sliding plates, aluminum-carbon sliding plates and sliding plates embedded with zirconium rings. The aluminum-zirconium-carbon sliding plate has good thermal shock resistance, erosion resistance and wear resistance when the plain steel is poured, has good comprehensive performance, and is a mature product. But when casting steel with calcium, because of Al in the slide₂O₃The SiO2 and CaO in molten steel can react at a lower temperature to generate low-melting matters, and the surface of the sliding plate is easy to be roughened and clamped in the process of scouring and controlling the flow of the molten steel. Although the zirconia slide plate has good thermal shock resistance, erosion resistance, oxidation resistance and other performances when pouring calcium treated steel, the zirconia slide plate also has melting property when pouring aluminum killed steelIn the case of damage to the material,

and zirconia is relatively expensive, in which case we have developed high performance magnesium skateboards.

Because magnesia has better molten steel erosion resistance and slag erosion resistance, the magnesia mainly comprises periclase and periclase-spinel which are developed by using high-purity magnesia, and the thermal shock resistance of the periclase sliding nozzle is poorer because the thermal expansion coefficient of the periclase is larger. In order to improve the thermal shock resistance, sintered magnesia and seawater magnesia are generally used as particles, and fused magnesia is used as fine powder. Because of the low coefficient of thermal expansion of magnesia alumina spinel compared to steatite, particulate forms of synthetic spinel have been added to the periclase quality of the sliding gate valve and we have developed a periclase-spinel sliding gate valve that has relatively good thermal shock resistance. The chemical composition of the spinel added is preferably close to the theoretical composition. The high-temperature strength of the magnesium sliding gate is not high due to the fact that the periclase is high in melting point and difficult to sinter. In order to promote the sintering, the in-situ spinel combines periclase crystals, so that the high-temperature strength of the material can be improved. Some magnesium sliding water gaps are also dipped with asphalt to further improve the thermal shock resistance and the erosion resistance, reduce the diameter of the gas hole and the size of the defect on the surface of the sliding plate and prolong the service life.

The price of the magnesium raw material is lower than that of the zirconia alumina, so the magnesium sliding gate has cost advantage. However, the service life of the magnesium sliding gate is limited due to poor thermal shock resistance and low high-temperature strength, so that the magnesium sliding gate is rarely used at home at present and has a certain market in Europe.

Disclosure of Invention

In order to solve the problems, the invention aims to provide a high-performance magnesium sliding brick with cast calcium-treated steel, high-oxygen steel and low-carbon high-quality steel, which opens up a new field of industry, solves the problems of low service life of sliding plates and high consumption of refractory steel per ton in a plurality of steel mills, saves cost for the steel mills, reduces resource waste, lowers cost and increases efficiency, and a preparation method thereof.

The purpose of the invention can be realized by the following technical scheme:

the high-performance magnesium sliding brick comprises the following components in percentage by weight: comprises the following components: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent.

The grain composition of each component is as follows: 97 (3-1, 2-1, 1-0.5 mm) fused magnesite grain diameter and more than or equal to 200 meshes, 1-0 mm of forsterite grain diameter, 0.5-0 mm of fused spinel grain diameter, more than or equal to 200 meshes of high-temperature burning promoting powder, more than or equal to 180 meshes of ceramic plastic binder, 325 meshes of carbon-containing powder, 325 meshes of graphite, more than or equal to 180 meshes of boron carbide, more than or equal to 180 meshes of aluminum-magnesium alloy powder and more than or equal to 180 meshes of silicon powder, and the resin reinforcing agent are liquid.

The 97 electric melting magnesia has the grain composition according to the weight percentage:

according to the weight percentage, the sum of the particle composition weight percentage of 97 electric smelting magnesite is 35 to 38 percent.

97 electric smelting magnesite: the MgO content is more than or equal to 97 percent, and the content of the forsterite is as follows: the content of SiO2 is less than or equal to 40 percent, the content of MgO is more than or equal to 45 percent, the content of the electric melting spinel is as follows: al (Al)₂O₃The content is more than or equal to 72 percent, the MgO content is more than or equal to 21 percent, and the high-temperature sintering promoting powder comprises the following components in percentage by weight: SiO2 content is less than or equal to 30 percent, Al₂O₃The content is more than or equal to 72 percent, and the ceramic plastic adhesive comprises the following components in percentage by weight: bulk density of about 450g/L, carbon-containing powder: the content of residual carbon is 85%, and the ratio of graphite: the content of C is more than or equal to 97 percent, and the content of boron carbide is as follows: the content of B4C is more than or equal to 90 percent, the aluminum magnesium alloy powder: the Al content is 50 +/-3%, the active metal (Al + Mg) is not less than 97.0%, and the silicon powder: the content of Si is more than or equal to 97 percent, and the weight percentage of the resin is as follows: the residual carbon content is 45 +/-4%, the solid content is 75-80%, and the viscosity is 15000-18000 mpa.

The preparation method of the high-performance magnesium sliding brick comprises the steps of stirring and mixing 97 electric melting magnesite, forsterite, electric melting spinel, high-temperature burning promoting powder, ceramic plastic adhesive, carbon-containing powder, graphite, boron carbide, aluminum-magnesium alloy powder, silicon powder, resin and resin reinforcing agent in proportion, then forming and naturally drying, then placing the mixture into a drying kiln, slowly heating and drying for 40-60 hours, preferably when the temperature of the drying kiln does not exceed 180-190 ℃, then pushing the mixture into a medium-high temperature tunnel kiln, uniformly heating to 580 +/-20 ℃, preserving heat for 15-20 hours, and finally uniformly cooling for 16-25 hours.

The high-performance magnesium sliding brick is produced by heating the drying kiln to 80 deg.c in 1 hr, maintaining at 80 deg.c for 12 hr, heating from 80 deg.c to 190 deg.c in 24 hr, and maintaining at 190 deg.c for 20 hr.

The high-performance magnesium sliding brick is prepared by uniformly heating to 580 +/-20 ℃ within 15-20 hours and finally uniformly cooling for 20 hours.

The magnesium-rich alkaline sliding plate is a compound which is very stable at high temperature and has a higher melting point, the thermal expansion coefficient of the magnesium-rich alkaline sliding plate is smaller than that of a corundum material, and the elastic modulus of the magnesium-rich alkaline sliding plate is between that of a zirconium plate and that of corundum, so that the magnesium-rich alkaline sliding plate has better chemical erosion resistance and thermal shock resistance.

1, the high-performance magnesium material is used as an alkaline resistant material, has a slow reaction speed with CaO when casting calcium-treated steel, and has excellent erosion resistance compared with aluminum-carbon and aluminum-zirconium-carbon sliding plates. And secondly, the magnesium-rich spinel has higher wear resistance, and can well improve the problem of galling of the sliding plate in the use process.

2, the high-property energy magnesium material also has a phase change process similar to that of a zirconium plate in the temperature rising and falling process, and microcracks are generated to achieve the effect of improving thermal shock resistance.

Compared with corundum and zirconium materials, the magnesium-rich spinel material has smaller density and larger porosity, so that the magnesium-rich spinel material has excellent thermal shock resistance.

The addition of carbon black with very low reactivity at high temperature is increased. The particle size distribution of the pug and the firing temperature of the product are improved and controlled, and the compactness of the material is improved. Meanwhile, the aluminum-magnesium alloy powder is added into the matrix, so that an inert compound can be produced in situ on the surface of the material in the heat treatment process of the material, and the penetration and oxidation of molten steel to the sliding plate are slowed down, so that the use is improved.

The product is mainly applied to a shaped refractory material matrix, the refractoriness of the product is more than 1800 ℃, the internal structure of the product is easily promoted to form carbon bonding after the green brick is dried at 180-250 ℃, and the product is prepared by the following steps under the conditions of keeping the original normal-temperature compressive strength, body density and air holes of the product: the green brick has excellent thermal shock resistance, stripping resistance and oxidation resistance, the product toughness is enhanced, and the influence of extreme cold and extreme heat on the green brick in the using process can be effectively improved, so that the green brick is cracked and stripped to influence the use, and the purpose of prolonging the service life is achieved.

The ceramic plastic agent is an inorganic additive, is used for compression molding, ramming materials and extrusion molding of green bodies, has the plasticizing effect even if the addition amount is small, has enhanced toughness, and can generate swelling under the action of mixed water, thereby generating the plasticizing effect and increasing the mechanical strength of the green bodies.

Detailed Description

The high-performance magnesium sliding brick comprises the following components in percentage by weight: comprises the following components: 97 percent to 54 percent of fused magnesia, 7 percent to 9 percent of forsterite, 12 percent to 18 percent of fused spinel, 4 percent to 6 percent of high-temperature sintering promoting powder, 5 percent to 8 percent of ceramic plastic adhesive, 1 percent to 3 percent of carbon-containing powder, 1 percent to 3 percent of graphite, 1 percent to 3 percent of boron carbide, 4 percent to 6 percent of aluminum-magnesium alloy powder, 2 percent to 4 percent of silicon powder, 100 percent of the total weight of all the components in the formula, 4 percent to 5 percent of additional resin and 0.4 percent to 0.5 percent of resin reinforcing agent.

The grain composition of each component is as follows: 97 (3-1, 2-1, 1-0.5 mm) fused magnesite grain diameter and more than or equal to 200 meshes, 1-0 mm of forsterite grain diameter, 0.5-0 mm of fused spinel grain diameter, more than or equal to 200 meshes of high-temperature burning promoting powder, more than or equal to 180 meshes of ceramic plastic binder, 325 meshes of carbon-containing powder, 325 meshes of graphite, more than or equal to 180 meshes of boron carbide, more than or equal to 180 meshes of aluminum-magnesium alloy powder and more than or equal to 180 meshes of silicon powder, and the resin reinforcing agent are liquid.

The 97 electric melting magnesia has the grain composition according to the weight percentage:

according to the weight percentage, the sum of the particle composition weight percentage of 97 electric smelting magnesite is 35 to 38 percent.

97 electric smelting magnesite: the MgO content is more than or equal to 97 percent, and the content of the forsterite is as follows: the content of SiO2 is less than or equal to 40 percent, the content of MgO is more than or equal to 45 percent, the content of the electric melting spinel is as follows: al (Al)₂O₃The content is more than or equal to 72 percent, the MgO content is more than or equal to 21 percent, and the high-temperature sintering promoting powder comprises the following components in percentage by weight: SiO2 content is less than or equal to 30 percent, Al₂O₃The content is more than or equal to 72 percent, and the ceramic plastic adhesive comprises the following components in percentage by weight: bulk density of about 450g/L, carbon-containing powder: the content of residual carbon is 85%, and the ratio of graphite: the content of C is more than or equal to 97 percent, and the content of boron carbide is as follows: the content of B4C is more than or equal to 90 percent, the aluminum magnesium alloy powder: the Al content is 50 +/-3%, the active metal (Al + Mg) is not less than 97.0%, and the silicon powder: the content of Si is more than or equal to 97 percent, and the weight percentage of the resin is as follows: the residual carbon content is 45 +/-4%, the solid content is 75-80%, and the viscosity is 15000-18000 mpa. The preparation method of the high-performance magnesium sliding plate brick comprises the steps of stirring and mixing 97 electric smelting magnesite, forsterite, electric smelting spinel, high-temperature burning promoting powder, a ceramic plastic adhesive, carbon-containing powder, graphite, boron carbide, aluminum-magnesium alloy powder, silicon powder, resin and a resin reinforcing agent in proportion, then forming and naturally drying, then placing the mixture into a drying kiln, slowly raising the temperature and drying for 40-60 hours, preferably ensuring that the temperature of the drying kiln does not exceed 180-190 ℃, then pushing the mixture into a medium-high temperature tunnel kiln, uniformly raising the temperature to 580 +/-20 ℃, preserving the heat for 15-20 hours, and finally uniformly lowering the temperature for 16-25 hours.

The high-performance magnesium sliding brick is produced by heating the drying kiln to 80 deg.c in 1 hr, maintaining at 80 deg.c for 12 hr, heating from 80 deg.c to 190 deg.c in 24 hr, and maintaining at 190 deg.c for 20 hr.

The high-performance magnesium sliding brick is prepared by uniformly heating to 580 +/-20 ℃ within 15-20 hours and finally uniformly cooling for 20 hours.

The magnesium-rich alkaline sliding plate is a compound which is very stable at high temperature and has a higher melting point, the thermal expansion coefficient of the magnesium-rich alkaline sliding plate is smaller than that of a corundum material, and the elastic modulus of the magnesium-rich alkaline sliding plate is between that of a zirconium plate and that of corundum, so that the magnesium-rich alkaline sliding plate has better chemical erosion resistance and thermal shock resistance