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CN-121974712-A - High-temperature-resistant foam rush-repair spray agent for local damage of industrial furnace refractory material, and preparation method and use method thereof

CN121974712ACN 121974712 ACN121974712 ACN 121974712ACN-121974712-A

Abstract

The invention discloses a high-temperature-resistant foam rush-repair spray agent for local damage of an industrial furnace refractory material, and a preparation method and a use method thereof. The high-temperature-resistant foam rush-repair spray agent is single-component wet foam and is packaged by an aerosol can, and the preparation raw materials comprise, by mass, 25% -40% of hollow microspheres, 12% -28% of aerogel micro powder, 6% -18% of inorganic fibers, 18% -30% of phosphate-based high-temperature binders, 2% -6% of foaming agents, 1% -5% of curing accelerators, 1% -4% of infrared opacifiers and the balance of deionized water. The spraying agent can finish spraying within 10 minutes under the fire condition that the surface of the furnace shell is 400 ℃ to form a light heat insulation layer of 10-20mm, and after 30 minutes, the surface of the furnace shell is 100 ℃, so that a protective layer is formed on the surface of the furnace shell, the rapid rush repair of the walking beam type heating furnace is realized, and the continuous operation is free from cracks and falling off for 60-90 days.

Inventors

  • HUANG LONG
  • LIAO XIAOQING
  • LI SHICHANG
  • LIU JIAN
  • Zuo Zongjing
  • YOU JINGDONG
  • HU QING
  • LI YI
  • JIAN ZHONG

Assignees

  • 新余钢铁股份有限公司

Dates

Publication Date
20260505
Application Date
20260204

Claims (10)

  1. 1. The high-temperature-resistant foam rush-repair spray agent for the local damage of the refractory material of the industrial furnace is characterized in that the high-temperature-resistant foam rush-repair spray agent is formed by packaging single-component wet foam through an aerosol can, and the preparation raw materials comprise the following components in percentage by mass: 25% -40% of hollow microsphere 12 To 28 percent of aerogel micro powder 6 To 18 percent of inorganic fiber 18 To 30 percent of phosphate high-temperature binder 2 To 6 percent of foaming agent 1 To 5 percent of curing accelerator 1 To 4 percent of infrared opacifier And the balance of deionized water.
  2. 2. The high-temperature-resistant foam rush-repair spray agent according to claim 1, wherein the hollow microspheres are selected from alumina hollow microspheres, mullite hollow microspheres, zirconium hollow microspheres and aluminum silicate hollow microspheres or a composite thereof, preferably the hollow microspheres have a particle size of 0.2-1 mm, a true density of less than or equal to 0.8g/cm < 3 >, and the aerogel micro powder is selected from SiO 2 aerogel micro powder, al 2 O 3 aerogel micro powder, zrO 2 aerogel micro powder, carbon aerogel micro powder or a composite aerogel thereof, preferably the specific surface area of the aerogel micro powder is more than or equal to 400m 2 /g, the particle size is 10-50 mu m, and the average pore diameter is less than or equal to 50nm.
  3. 3. The high temperature resistant foam emergency repair spray of claim 1, wherein the inorganic fibers are selected from high alumina ceramic fibers, aluminum silicate fibers, zirconium-containing ceramic fibers, aluminum oxide fibers, basalt fibers or a mixture thereof, and preferably the inorganic fibers have a fiber length of 3mm-8mm and a diameter of less than or equal to 10 μm.
  4. 4. The high temperature resistant foam emergency repair spray of claim 1, wherein the phosphate-based high temperature binder is selected from aluminum dihydrogen phosphate, aluminum chromium phosphate, magnesium phosphate, zirconium phosphate or a composite solution thereof and modified silica sol, and preferably the solid content of the phosphate-based high temperature binder is 35% -55%.
  5. 5. The high temperature resistant foam emergency repair spray of claim 1, wherein the foaming agent is a physical foaming agent or a chemical foaming agent, preferably the physical foaming agent is selected from alkyl glycoside, sodium dodecyl sulfate, cocamidopropyl betaine, protein hydrolysate or a combination thereof, preferably the chemical foaming agent is selected from hydrogen peroxide-manganese catalyst system; Preferably, the curing accelerator is selected from light burned MgO, nano ZrO 2 , nano Al 2 O 3 , magnesium aluminum carbonate or a composite thereof, and the particle size D50 of the curing accelerator is preferably less than or equal to 5 mu m; Preferably, the infrared opacifier is selected from rutile TiO 2 、ZrO 2 , potassium titanate whisker, siC micropowder or a composite thereof, and the particle size of the infrared opacifier is preferably 0.2-2 μm.
  6. 6. The high temperature resistant foam emergency repair spray of any one of claims 1-5, wherein the high temperature resistant foam emergency repair spray has a total solids content of 60% -75% and a wet foam density of 0.3g/cm 3 -0.6g/cm 3 .
  7. 7. A method for preparing the high-temperature-resistant foam emergency repair spray agent according to any one of claims 1 to 6, which is characterized by comprising the steps of uniformly mixing other components except a foaming agent, adding the foaming agent for foaming to obtain stable wet foam, filling the stable wet foam, and flushing a propellant to obtain the sprayable high-temperature-resistant foam emergency repair spray agent.
  8. 8. The method of manufacturing according to claim 7, comprising the steps of: (a) Mixing phosphate high-temperature binder with deionized water, sequentially adding hollow micro-beads and aerogel micro-powder under the vacuum degree of 0.04-0.08MPa, and stirring for 15-30min; (b) Inorganic fibers are scattered, and vacuum stirring is continued for 10-15min; (c) Adding an infrared opacifier and a curing accelerator, and mixing for 3-8min at normal pressure; (d) Injecting a foaming agent, and foaming at 200-600rpm for 2-5min to obtain stable wet foam; (e) Filling the mixture into a high-pressure aerosol can, filling a propellant, and sealing to obtain the spray-type high-temperature-resistant foam rush repair spray; Preferably, the propellant is butane, dimethyl ether, nitrogen, CO 2 or a mixed gas thereof, and the pressure in the tank is 0.4MPa to 0.8MPa.
  9. 9. A method for hot rush repair of an industrial furnace by using the high temperature resistant foam rush repair spray of any one of claims 1 to 8, which is characterized by comprising the steps of directly spraying the spray on a part of the refractory material of the industrial furnace where the refractory material is damaged to form a heat insulation layer; Preferably, 2-4 layers of the high-temperature-resistant foam rush-repair spray agent are directly sprayed under the condition of fire at the surface temperature of the furnace shell of 400-1000 ℃ at intervals of 1-3min to form a heat insulation layer with the total thickness of 10-20 mm, so that the surface temperature of the furnace shell is reduced to less than or equal to 100 ℃ within 30 min.
  10. 10. The method of claim 9, wherein the heat insulating layer and the furnace shell form a chemical-mechanical engagement after rush repair, and the heat shock circulation at room temperature-1000 ℃ is free from cracking and falling off for more than 100 times, and can maintain continuous operation for 60-90 days.

Description

High-temperature-resistant foam rush-repair spray agent for local damage of industrial furnace refractory material, and preparation method and use method thereof Technical Field The invention relates to the technical field of preparation of industrial kiln repairing materials, in particular to a high-temperature-resistant foam rush-repair spray agent for local damage of an industrial kiln refractory material, and a preparation method and a use method thereof. Background The walking beam heating furnace realizes the accurate temperature rise of metal blanks (billets, aluminum blanks and the like) through the stepping conveying and the uniform heating, and provides qualified blanks for the subsequent rolling, forging and other processing. After the walking beam heating furnace is used for a long time, the shell can be heated and damaged due to falling or damage of the refractory material of the inner layer, and the existing repairing mode mainly comprises the following three types: a) And (3) welding a steel plate support and an asbestos plug on site, namely welding a steel plate support for placing an asbestos fiber blanket on a furnace shell, and plugging the asbestos fiber blanket into a refractory material falling-off and fire channeling area. B) And (3) coating refractory castable, namely erecting a die, pumping Al 2O3 -SiC low-cement castable, curing for 4 hours, removing the die, and heating to 600 ℃ for use. C) The traditional high-temperature paint is sprayed with silicate-based high-temperature paint with the thickness of 0.5mm-1mm, only plays a role in preventing oxidization and has almost no heat insulation effect. However, the repairing method has the following defects: ① The construction window is long, the asbestos fiber blanket/castable needs 6-24 hours, the furnace temperature needs to be reduced to below 800 ℃, and the productivity is affected; ② The heat conductivity coefficient is high, namely, the asbestos fiber blanket and the castable cannot reduce the hot spot at 700 ℃ to below 200 ℃; ③ The adhesive force is poor, namely, the asbestos fiber blanket is in point contact with the furnace shell, and high-speed air flow can be blown off after 10 minutes; ④ The additional load is large, the casting material generates static load to the 20mm furnace shell, and the permanent deformation of the steel plate is easy to cause; ⑤ The asbestos fiber blanket contains free crystal SiO 2 and construction dust exceeds standard. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a high-temperature-resistant foam rush-repair spray agent for local damage of an industrial furnace refractory material, and a preparation method and a use method thereof. The invention solves the technical problems that the following technical proposal is adopted. The invention provides a high-temperature-resistant foam rush-repair spray which is formed by packaging single-component wet foam through an aerosol can, wherein the preparation raw materials comprise the following components in percentage by mass: 25% -40% of hollow microsphere 12 To 28 percent of aerogel micro powder 6 To 18 percent of inorganic fiber 18 To 30 percent of phosphate high-temperature binder 2 To 6 percent of foaming agent 1 To 5 percent of curing accelerator 1 To 4 percent of infrared opacifier And the balance of deionized water. In some embodiments of the present invention, the cenospheres are selected from the group consisting of high alumina ceramic fibers, alumina cenospheres, mullite cenospheres, zirconium cenospheres, aluminum silicate cenospheres, or a combination thereof, preferably the cenospheres have a particle size of 0.2mm to 1mm and a true density of 0.8g/cm3 or less. In some embodiments of the present invention, the aerogel micro powder is selected from the group consisting of SiO 2 aerogel micro powder, al 2O3 aerogel micro powder, zrO 2 aerogel micro powder, carbon aerogel micro powder or composite aerogel thereof, preferably the specific surface area of the aerogel micro powder is equal to or greater than 400m 2/g, the particle size is 10-50 μm, and the average pore diameter is equal to or less than 50nm. In some embodiments of the invention, the inorganic fibers are selected from the group consisting of high alumina ceramic fibers, aluminum silicate fibers, zirconium-containing ceramic fibers, aluminum oxide fibers, basalt fibers, or mixtures thereof, preferably the inorganic fibers have a fiber length of 3mm to 8mm and a diameter of 10 μm or less. In some embodiments of the invention, the phosphate-based high temperature binder is selected from aluminum dihydrogen phosphate, aluminum chromium phosphate, magnesium phosphate, zirconium phosphate, or a composite solution thereof with a modified silica sol, preferably the phosphate-based high temperature binder has a solids content of 35% to 55%. In some embodiments of the invention, the foaming agent is a physical foaming agent or a chemical