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Steel ladle repairing material and preparation and use methods thereof

A repairing material and ladle technology, applied in the field of ladle repairing materials, can solve problems such as unstable adhesion performance, easy overall decline, high rebound rate, etc., and achieve the effects of improving high temperature and adhesion performance, improving operating efficiency, and prolonging service life

Active Publication Date: 2022-01-14
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there are domestic reports on aluminum-magnesium and magnesium-chromium ladle repair materials, in actual use, ladle repair materials generally have poor construction performance, and some have unstable adhesion performance, tend to decline overall, and have a high rebound rate; Parts are easy to fall off after baking; some repair materials have high water content, and the construction, maintenance and baking cycle is long
These are all detrimental to the use effect of the repair material and the ladle lining after the repair material, and also reduce the maintenance and operation efficiency of the ladle

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0027] A preparation method of a ladle repair compound, comprising:

[0028] Dry ingredients preparation:

[0029] Weigh each raw material by weight percentage, sintered corundum particles and fine powder, fused magnesia particles, calcium hexaaluminate particles, magnesium oxide micropowder, silicon micropowder, alumina micropowder, pre-synthesized active corundum-spinel micropowder, soft Clay fine powder, metal aluminum powder and calcium aluminate cement are placed in a container, stirred evenly and sealed, and set aside;

[0030] Mixed sol slurry preparation:

[0031] Add the carbon fiber and dispersant to the aluminum sol, stir and disperse evenly, and pack it in a sealed container for later use.

[0032] A method for using a ladle repairing material, comprising: at the repairing construction site, mixing dry material, mixed sol slurry and added clean water evenly according to the designed ratio, and then using it for repairing construction. The repair material can adj...

Embodiment 1

[0033] Embodiment 1: The raw material of the ladle repair material includes a base material and an additive, and the base material composition comprises by weight percentage (%): sintered corundum particles 51; fused magnesia particles 12; calcium hexaaluminate particles 12; Magnesium micropowder 3; Silicon micropowder 4; Pre-synthesized active corundum-spinel micropowder 5; Soft clay fine powder 6; Calcium aluminate cement 1; Aluminum sol 6; %) includes: carbon fiber 0.15 and dispersant 0.1; purified water is added 1 according to the weight percentage (%) of the base material; the maximum aggregate particle size is 3mm. The repair material has low fluidity, high plasticity and adhesion, and fast sintering speed. The compressive strength at 110°C×24h is 35.7MPa, and the compressive strength at 1500°C×3h is 48.4MPa. It adopts the repair method of smearing and is suitable for ladle furnace lining. Rapid repair of small area or local damage with small repair thickness.

Embodiment 2

[0034] Embodiment 2: The raw material of the ladle repair material includes a base material and an additive, and the composition of the base material material comprises by weight percentage (%): sintered corundum particles 45, sintered corundum fine powder 8, fused magnesia particles 20, hexaluminum Calcium acid particles 8, magnesium oxide powder 2, silicon powder 3, alumina powder 2, pre-synthesized active corundum-spinel powder 4, soft clay fine powder 2, metal aluminum powder 1, calcium aluminate cement 3, aluminum sol 2; the composition of the additive raw material includes: carbon fiber 0.06 and dispersant 0.03 according to the weight percentage (%) of the base material; purified water is added 4 according to the weight percentage (%) of the base material; the maximum aggregate particle size is 5mm . The repair material has good fluidity and high adhesion. The compressive strength is 64.3MPa at 110°C×24h and 78.6MPa at 1500°C×3h. Repair thicker damaged parts.

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Abstract

The invention discloses a steel ladle repairing material as well as preparation method and use methods thereof. The steel ladle repairing material is prepared from a base material and an additive. The base material comprises the following raw materials in percentage by weight: 43-58% of sintered corundum particles and fine powder, 12-24% of fused magnesia particles, 5-15% of calcium hexaluminate particles, 2-4% of magnesium oxide micro powder, 1-4% of silicon micro powder, 0-2% of aluminum oxide micro powder, 3-6% of pre-synthesized active corundum-spinel micro powder, 2-6% of soft clay fine powder, 0-3% of metal aluminum powder, 1-4% of calcium aluminate cement and 2-6% of alumina sol. According to the weight percentage of the base material, the additive comprises 0.02-0.15% of carbon fibers and 0.02-0.1% of a dispersing agent. The preparation method comprises the steps of dry material preparation and mixed sol slurry preparation. The use method comprises the following steps: uniformly mixing and stirring the dry material, the mixed sol slurry and the added purified water according to a designed ratio in a repair construction operation site for repair construction. By optimizing the raw material composition, the high-temperature and adhesion properties of the repairing material can be improved, and the service life of the ladle furnace lining under the condition of large scrap steel ratio can be effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of steelmaking and refractory materials, in particular to a ladle repair material and its preparation and use method. Background technique [0002] The ladle is one of the important equipment required for the steelmaking process. It is used to contain molten steel, and the molten steel can also be refined and other processes in the ladle. Improving the service life of ladles is conducive to improving the production efficiency of steel mills, reducing energy consumption, saving resources and reducing environmental pollution. Therefore, refractory materials for ladles are increasingly developing in the direction of longevity. However, during the use of the ladle, different parts of the ladle lining are in different working conditions, and local serious melting loss is inevitable. In order to avoid the replacement of the entire working lining due to partial damage to the ladle lining and prolong the service li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101B22D41/02
CPCC04B35/101B22D41/02C04B2235/3206C04B2235/3222C04B2235/3418C04B2235/349C04B2235/3218C04B2235/402C04B2235/5248C04B2235/96
Inventor 袁文燮张洪雷肖同达赵保华杨新泉
Owner 武汉钢铁有限公司
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