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CN-122010540-A - High Jiang Kanglie corrosion-resistant castable and preparation method thereof

CN122010540ACN 122010540 ACN122010540 ACN 122010540ACN-122010540-A

Abstract

The application belongs to the technical field of refractory castable, and particularly provides a high Jiang Kanglie corrosion-resistant castable and a preparation method thereof. A high Jiang Kanglie corrosion-resistant castable comprises dense corundum, brown corundum, white corundum, bauxite, silicon carbide, active alumina, spherical asphalt, pure calcium aluminate cement, sodium hexametaphosphate, an antioxidant and a composite additive, wherein the composite additive is prepared by compounding layered double hydroxide and modified MOF. The high Jiang Kanglie corrosion resistant castable prepared by the application has good high-temperature flexural strength and corrosion resistance.

Inventors

  • SHE YUNFENG
  • WEI JUNKUI
  • XIA YANG

Assignees

  • 长兴云峰炉料有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. The high Jiang Kanglie corrosion-resistant castable is characterized by comprising, by weight, 11-13 parts of compact corundum, 21-23 parts of brown corundum, 13-15 parts of white corundum, 20-22 parts of bauxite, 13-15 parts of silicon carbide, 7-9 parts of activated alumina, 1-2.5 parts of spherical asphalt, 4-6 parts of pure calcium aluminate cement, 0.1-0.3 part of sodium hexametaphosphate, 1-2 parts of an antioxidant and 5-7 parts of a composite additive; The composite additive is prepared by compositing layered double hydroxide and modified MOF.
  2. 2. The high-strength anti-cracking corrosion-resistant castable is characterized in that the preparation method of the composite additive comprises the following steps of A1, dispersing modified MOF in deionized water in an ultrasonic manner to obtain modified MOF suspension, A2, dissolving MgCl 2 ·6H 2 O and Al (NO 3 ) 3 ·9H 2 O in distilled water to obtain layered double hydroxide precursors, dissolving ammonium dihydrogen phosphate and NaOH in distilled water to obtain solution 1, A3, slowly dropwise adding the layered double hydroxide precursors into the modified MOF suspension, vigorously stirring for 1h, then dropwise adding the solution 1, aging, filtering, washing and drying.
  3. 3. The high-strength anti-cracking corrosion-resistant castable according to claim 2, wherein in the A3, the mass ratio of the layered double hydroxide precursor to the modified MOF is 3-4.5:1.
  4. 4. The high-strength anti-cracking corrosion-resistant castable according to claim 1, wherein the preparation method of the modified MOF comprises the following steps of 1) dissolving zirconium tetrachloride in DMF to obtain solution A, adding monocarboxylic acid into DMF, adding terephthalic acid after dissolving, stirring and dissolving to obtain solution B, 2) ultrasonically mixing the solution A and the solution B, washing and drying after reaction to obtain the monocarboxylic acid modified MOF, and 3) adding the monocarboxylic acid modified MOF into cerium nitrate solution, and roasting to obtain the modified MOF.
  5. 5. The high-strength, crack-resistant and corrosion-resistant castable according to claim 4, wherein in the 1), the monocarboxylic acid is octanoic acid or butyric acid.
  6. 6. The high-strength, anti-cracking and corrosion-resistant castable according to claim 4, wherein in the 2), the molar ratio of zirconium tetrachloride to terephthalic acid to monocarboxylic acid in the solution A and the solution B is 1:0.5-1:20-25.
  7. 7. The high-strength anti-cracking and anti-corrosion castable according to claim 4, wherein in the 3), the mass ratio of the monocarboxylic acid modified MOF to the cerium nitrate hexahydrate is 1:3-5.
  8. 8. The high-strength anti-cracking corrosion-resistant castable according to claim 1, wherein the dense corundum is formed by mixing dense corundum with a granularity of 5-8mm and dense corundum with a granularity of 3-5mm, the brown corundum is formed by mixing brown corundum with a granularity of 1-3mm and brown corundum with a granularity of 0-1mm, the granularity of the white corundum is 325 meshes, the bauxite is formed by mixing bauxite with a granularity of 3-5mm and bauxite with a granularity of 1-3mm, and the silicon carbide is formed by mixing silicon carbide with a granularity of 1-3mm and silicon carbide with a granularity of 325 meshes.
  9. 9. A method for preparing the high-strength anti-cracking corrosion-resistant castable according to any one of claims 1 to 8, which is characterized by comprising the following steps of S1, weighing raw materials according to a proportion, dry-mixing, adding deionized water, wet-mixing to prepare mixed slurry, S2, injecting the mixed slurry into a mould, vibrating and forming, carrying out maintenance with the mould, demoulding to prepare a blank, and S3, drying the blank, and calcining at a high temperature.
  10. 10. The method for preparing the high Jiang Kanglie corrosion resistant castable according to claim 9, wherein in the step S3, the high-temperature calcination is carried out at a rate of 3 ℃ per minute to 1000 ℃ to 1100 ℃, the temperature is kept for 3 hours, and then the temperature is raised at a rate of 5 ℃ per minute to 1400 ℃ to 1500 ℃, and the temperature is kept for 3 hours.

Description

High Jiang Kanglie corrosion-resistant castable and preparation method thereof Technical Field The application belongs to the technical field of refractory castable, and particularly relates to a high Jiang Kanglie corrosion-resistant castable and a preparation method thereof. Background The blast furnace ironmaking is a main ironmaking process, a blast furnace tapping channel is an important component of a blast furnace ironmaking system, refractory castable is an important lining material, and the use condition of the channel lining material is more severe along with the increase of the temperature of molten iron, the increase of iron yield, the extension of iron tapping time and the increase of the flow rate of molten iron caused by the large-scale, long-life and high-temperature and high-pressure operation of a modern blast furnace. The Al 2O3 -SiC-C (ASC) castable is an unshaped refractory material prepared by taking Al 2O3, siC and C as main raw materials and adding other additives, has good thermal shock resistance and slag erosion resistance, and is widely applied to blast furnace tapping runners and other parts. The ASC castable usually adopts pure calcium aluminate cement as a binding agent, and CaO in the cement binding agent is easy to react with Al 2O3、SiO2 at high temperature to generate a low-melting-point phase, so that the high-temperature strength and erosion resistance of the material are reduced, and the application range of the material is limited. In order to solve the problems, the patent application document with the application publication number of CN107353018A discloses an iron hook castable, in the application, through adding a composite additive consisting of citric acid aqueous solution, chemically pure trisodium phosphate solution and calcium lignosulfonate solution, non-floating phosphate is formed on the surface of a clinker phase by adding phosphate, the number of open holes is reduced, the number of closed holes is increased, the impermeability is improved, lignin sulfonate has semi-colloid property, a membranous cementing layer can be formed between cement hydration products, and the membranous cementing layer and the hydration products are mutually filled, so that the compactness is increased, and the strength of the castable is improved. The above document prevents cement hydration to a certain extent by adding the composite additive, so that the cement hydration is more ordered, and the structure formed by hydration is more compact, but the problem that CaO introduced by the cement bond and the rest of components in the matrix form a low-melting-point phase to reduce the strength and corrosion resistance of the castable is not directly solved. Disclosure of Invention Aiming at the problems, the application provides the high Jiang Kanglie corrosion-resistant castable and the preparation method thereof in order to further improve the strength and the corrosion resistance of the high-strength anti-cracking corrosion-resistant castable. The application firstly provides a high Jiang Kanglie corrosion-resistant castable, which comprises, by weight, 11-13 parts of compact corundum, 21-23 parts of brown corundum, 13-15 parts of white corundum, 20-22 parts of bauxite, 13-15 parts of silicon carbide, 7-9 parts of activated alumina, 1-2.5 parts of spherical asphalt, 4-6 parts of pure calcium aluminate cement, 0.1-0.3 part of sodium hexametaphosphate, 1-2 parts of an antioxidant and 5-7 parts of a composite additive; The composite additive is prepared by compositing layered double hydroxide and modified MOF. Further, the preparation method of the composite additive comprises the following steps of A1, dispersing modified MOF in deionized water in an ultrasonic manner to obtain modified MOF suspension, A2, dissolving MgCl 2·6H2 O and Al (NO 3)3·9H2 O in distilled water to obtain a layered double hydroxide precursor, dissolving monoammonium phosphate and NaOH in distilled water to obtain solution 1, A3, slowly dropwise adding the layered double hydroxide precursor into the modified MOF suspension, vigorously stirring for 1h, then dropwise adding the solution 1, aging, filtering, washing and drying to obtain the composite additive. Further, in A3, the mass ratio of the layered double hydroxide precursor to the modified MOF is 3-4.5:1. The preparation method of the modified MOF comprises the steps of 1) dissolving zirconium tetrachloride in DMF to obtain a solution A, adding monocarboxylic acid into DMF, dissolving, adding terephthalic acid, stirring and dissolving to obtain a solution B, 2) ultrasonically mixing the solution A and the solution B, reacting, washing and drying to obtain the monocarboxylic acid modified MOF, and 3) adding the monocarboxylic acid modified MOF into cerium nitrate solution, and roasting to obtain the modified MOF. Further, in the above 1), the monocarboxylic acid is octanoic acid or butyric acid. Further, in the 2), the molar ratio of zirconium tetrachlori