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CN-122010532-A - Impregnation-free alkaline sliding plate brick and preparation method thereof

CN122010532ACN 122010532 ACN122010532 ACN 122010532ACN-122010532-A

Abstract

The invention discloses an alkali slide brick without impregnation, which comprises, by weight, 65% -70% of 97 fused magnesia, 4% -6% of forsterite, 5% -7% of fused spinel, 2% -3% of boron carbide, 3% -5% of nano alpha-Al 2 O 3 micro powder, 3% -4% of modified thermoplastic resin, 3% -5% of ceramic plastic adhesive, 2% -3% of crystalline graphite, 1% -2% of aluminum magnesium alloy powder, 1% -2% of high-temperature asphalt powder, and 3% -4% of external thermoplastic resin and 0.3% -0.5% of resin reinforcing agent. The invention aims to provide an alkaline corrosion-resistant, impregnation-free, environment-friendly, low-expansion and thermal shock-resistant impregnation-free alkaline sliding plate brick and a preparation method thereof.

Inventors

  • LU HONG
  • HANG WENMING
  • WANG YUANLIN

Assignees

  • 无锡市南方耐材有限公司

Dates

Publication Date
20260512
Application Date
20260202

Claims (10)

  1. 1. The impregnation-free alkaline sliding plate brick is characterized by comprising the following components in percentage by weight: 97 percent of electric fused magnesia accounting for 65 percent to 70 percent, 4-6% Of forsterite, 5-7% Of electrofused spinel, 2-3% Of boron carbide, 3 To 5 percent of nanometer alpha-Al 2 O 3 micro powder, 3 To 4 percent of modified thermoplastic resin, 3-5% Of ceramic plastic adhesive, 2-3% Of flake graphite, 1 To 2 percent of aluminum magnesium alloy powder, 1 To 2 percent of high-temperature asphalt powder, Additionally, 3 to 4 percent of thermoplastic resin, 0.3 To 0.5 percent of resin reinforcing agent.
  2. 2. The impregnation-free alkaline sliding tile of claim 1, wherein the 97 electrically fused magnesia grain size fraction is: 3-1mm,22%-25%; 2-1mm,10%-13%; 1-0.5mm,8%-10%; 0.5-0mm,7%-9%; 200 meshes, 18% -20%; the bulk density of the particles is more than or equal to 68 percent.
  3. 3. The impregnation-free alkaline sliding tile of claim 2, wherein the composition is graded as follows: the electrofusion spinel is more than or equal to 200 meshes; the forsterite is more than or equal to 200 meshes; The boron carbide is 325 meshes; the nanometer alpha-Al 2 O 3 is 1 mu m; The crystalline flake graphite is 300 meshes; the aluminum magnesium alloy powder is more than or equal to 180 meshes; The high-temperature asphalt powder is 200 meshes; The ceramic plastic adhesive is 180 meshes; the thermoplastic resin and the resin reinforcing agent are low-viscosity liquid, and the viscosity is 12000-15000mpa s。
  4. 4. A method of making an impregnation-free alkaline skateboard tile as claimed in any one of claims 1 to 3, comprising the steps of; S1, preprocessing components, namely crushing and screening 97 fused magnesia, forsterite and fused spinel according to the grading, and removing adsorbed water for later use; S2, mixing in stages; S3, high-pressure forming; s4, gradient drying; S5, sintering at a low temperature; S6, post-processing.
  5. 5. The method for preparing the impregnation-free alkaline sliding plate brick according to claim 4, wherein in the step S1, the granularity deviation is less than or equal to 5%, and the boron carbide is dried for 2 hours at 120 ℃.
  6. 6. The method of manufacturing an impregnation-free alkaline sliding tile according to claim 4, wherein in step S2, the step of mixing in stages comprises the steps of: Firstly, mixing a framework, namely adding 97 fused magnesia coarse particles with the diameter of 3-1mm and 21mm into a high-speed mixer, and mixing for 4-6 minutes at the rotating speed of 150 r/min; The second stage of filling and mixing, namely adding 97 fused magnesia fine particles of 1-0.5mm, 0.5-0mm, 200 meshes, forsterite and fused spinel, reducing the rotating speed to 100r/min, and mixing for 8-10 minutes; The third stage of functional mixing, namely adding boron carbide, nano alpha-Al 2 O 3 , graphite, aluminum magnesium alloy powder and high-temperature asphalt powder, mixing for 10-12 minutes at the rotating speed of 80 r/min; And in the fourth stage, bonding and mixing, namely adding the modified thermoplastic resin and the resin reinforcing agent, and mixing for 5-8 minutes at the rotating speed of 60 r/min.
  7. 7. The method for preparing the impregnation-free alkaline sliding plate brick according to claim 4, wherein in the step S3, a 1500-ton spiral brick press is adopted for three times of pressurization, the initial pressure is 30MPa, then the pressure is kept for 5 seconds, the middle pressure is 80MPa, then the pressure is kept for 8 seconds, the final pressure is 120MPa, then the pressure is kept for 10 seconds, and the volume density of the green body is more than or equal to 2.75g/cm < 3 >.
  8. 8. The method for preparing an alkali-free sliding tile according to claim 4, wherein the step S4 of gradient drying comprises the steps of: pre-drying, namely naturally drying for 24 hours, and removing free water on the surface; Gradient heating to 60 deg.c for 1 hr, maintaining for 10 hr to eliminate adsorbed water, slowly heating to 120 deg.c for 18 hr, maintaining for 15 hr to eliminate crystal water, heating to 180 deg.c for 10 hr, maintaining for 20 hr, and final resin solidification for 58-63 hr.
  9. 9. The method for preparing an alkali-free sliding tile according to claim 4, wherein the low-temperature firing in step S5 comprises the steps of: The temperature rising stage is to uniformly raise the temperature to 580+/-10 ℃ in 16 hours, and control the temperature rising rate to 36 ℃ per hour; the heat preservation stage is to preserve heat for 18 hours; and in the cooling stage, the temperature is cooled to the room temperature at a constant speed for 24 hours, and the cooling rate is 24 ℃ per hour.
  10. 10. The method for preparing the non-impregnated alkaline sliding plate brick according to claim 4, wherein the processing in the step S6 comprises finishing the brick body and sleeving the finished brick with an iron shell.

Description

Impregnation-free alkaline sliding plate brick and preparation method thereof Technical Field The invention relates to the field of refractory materials with inorganic materials as base materials, in particular to an impregnation-free alkaline sliding plate brick and a preparation method thereof. Background The sliding plate brick is used as a 'throat part' for continuous casting production, and the performance of the sliding plate brick directly determines the cleanliness of molten steel, the number of continuous casting furnaces and the safety production stability. Currently, three major technical pain points which cannot be blended exist in mainstream skateboards in the industry: 1. Although the environment-friendly short plate of the traditional alkaline skateboard (magnesium carbon series) can resist alkaline corrosion of CaO, mnO and the like, the compactness is improved by adopting an asphalt vacuum pressurizing impregnation and high-temperature carbonization process, tar volatile matters (benzopyrene and phenols) generated in the process not only pollute the environment (the emission concentration is 5-8 times higher than national standard), but also endanger the health of operators, and toxic gas can be released when the impregnated product is used, so that the environment-friendly steel-making policy requirement is not met; 2. The alkali-resistant defect of the soaking-free slide plate (aluminum carbon/aluminum zirconium carbon series) is that the existing soaking-free technology mostly uses aluminum oxide as a base material, when calcium treatment steel is poured, al 2O3、SiO2 is easy to react with CaO in molten steel to generate CaO-Al 2O3-SiO2 series low-melting matters (the melting point is only 1200-1350 ℃), so that the surface of the slide plate is napped and clamped, the number of continuous casting furnaces is only 2-4 furnaces, and is far lower than that of 5-8 furnaces required by industry; 3. The thermal shock stability of the magnesium material is bottleneck that a pure magnesium slide plate is easy to crack under the quenching and quenching working condition of molten steel due to large thermal expansion coefficient (the thermal expansion rate of 20-1000 ℃ is 1.5% -1.8%), a large amount of graphite is needed to be added to improve the thermal shock property, but the graphite can form a loose layer due to carbon loss by oxidation, so that molten steel infiltration and erosion are accelerated, and the contradiction circulation of thermal shock resistance and erosion resistance is involved. The prior art only singly optimizes the corrosion resistance or the environmental protection, does not form a synergistic technical system of alkaline nature, non-dipping, thermal shock resistance and low oxidation, and cannot meet the dual requirements of the current steelmaking industry on high performance and low pollution. Disclosure of Invention In order to solve the problems, the invention aims to provide an alkaline corrosion-resistant, impregnation-free, environment-friendly, low-expansion and thermal shock-resistant impregnation-free alkaline sliding plate brick and a preparation method thereof. According to one aspect of the invention, there is provided an impregnation-free alkaline sliding tile comprising the following components in weight percent: 97 percent of electric fused magnesia accounting for 65 percent to 70 percent, 4-6% Of forsterite, 5-7% Of electrofused spinel, 2-3% Of boron carbide, 3 To 5 percent of nanometer alpha-Al 2O3 micro powder, 3 To 4 percent of modified thermoplastic resin, 3-5% Of ceramic plastic adhesive, 2-3% Of flake graphite, 1 To 2 percent of aluminum magnesium alloy powder, 1 To 2 percent of high-temperature asphalt powder, Additionally, 3 to 4 percent of thermoplastic resin, 0.3 To 0.5 percent of resin reinforcing agent. In some embodiments, the 97 electrically fused magnesia grain size fraction is: 3-1mm,22%-25%; 2-1mm,10%-13%; 1-0.5mm,8%-10%; 0.5-0mm,7%-9%; 200 meshes, 18% -20%; The bulk density of the particles is more than or equal to 68 percent. In some embodiments, the individual components are graded as follows: the electrofusion spinel is more than or equal to 200 meshes; Forsterite is more than or equal to 200 meshes; the boron carbide is 325 meshes; Nano alpha-Al 2O3 is 1 mu m; Flake graphite is 300 meshes; The aluminum magnesium alloy powder is more than or equal to 180 meshes; the high-temperature asphalt powder is 200 meshes; the ceramic plastic adhesive is 180 meshes; The thermoplastic resin and the resin reinforcing agent are low viscosity liquids with a viscosity of 12000-15000mpa s。 According to one aspect of the present invention, there is provided a method for preparing an impregnation-free alkaline sliding tile, characterized by comprising the steps of; S1, preprocessing components, namely crushing and screening 97 fused magnesia, forsterite and fused spinel according to the grading, and removing adsorbed water for later use; S2, mixing in