A ladle permanent layer low thermal conductivity repairing material and a preparation method thereof

By preparing a low thermal conductivity repair material suitable for calcium hexaaluminate castables, the problem of crack repair in the permanent layer of the new generation of calcium hexaaluminate was solved, the service life was extended and the thermal conductivity was reduced, and efficient heat insulation and cost savings were achieved for the steel ladle.

CN118239790BActive Publication Date: 2026-06-23武汉钢铁有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
武汉钢铁有限公司
Filing Date
2024-04-11
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

When using the new generation of low thermal conductivity calcium hexaaluminate castable, the existing permanent layer material for steel ladles has problems with crack formation and repair difficulties. Furthermore, the reaction between the repair material and calcium hexaaluminate affects the thermal conductivity, resulting in a large temperature drop in molten steel and high costs.

Method used

A low thermal conductivity repair material is formed by uniformly mixing and stirring calcium hexaaluminate castables, consisting of calcium hexaaluminate aggregate with a particle size of ≥1mm to <3mm, calcium hexaaluminate aggregate with a particle size of ≥0.1mm to <1mm, calcium hexaaluminate fine powder with a particle size of ≤0.074mm, α-Al2O3 micro powder with a particle size of ≤20μm, acrylic short-cut fibers, a coagulating agent, and sodium polyacrylate.

Benefits of technology

It extends the service life of the permanent layer to no less than 1100 heats, reduces the thermal conductivity by 20-30%, lowers the temperature of molten steel by 3-7℃, saves 4-15 yuan per ton of steel, and improves the heat insulation effect and service life.

✦ Generated by Eureka AI based on patent content.

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Abstract

A low thermal conductivity repair material for the permanent layer of steel ladles, comprising the following raw materials and wt% as follows: calcium hexaaluminate aggregate with a particle size ≥1mm to <3mm: 15-25%; calcium hexaaluminate aggregate with a particle size ≥0.1mm to <1mm: 15-25%; fine calcium hexaaluminate powder with a particle size ≤0.074mm: 30-45%; α-Al2O3 micro powder with a particle size ≤20μm: 5-10%; chopped acrylic fibers: 0.05-0.3%; a setting accelerator: 1-3%; and sodium polyacrylate: 5-25%. Preparation method: Mix all raw materials except sodium polyacrylate and the setting accelerator evenly; add sodium polyacrylate and stir, then seal and store; before use, add the setting accelerator and stir evenly before use for repair. This invention solves the problem of repairing the permanent layer of steel ladles by using a repair material with calcium hexaaluminate as the main raw material. The number of heats that can be repaired can be increased from no more than 1020 to no less than 1100. Its thermal conductivity is reduced from 1.0w / (m·k) to about 0.65w / (m·k), the temperature drop of molten steel is 3-7℃, and the cost per ton of steel is reduced by 4-15 yuan.
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