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Lightweight insulated calcium hexaluminate castable

The technology of calcium hexaaluminate and castable is applied in the field of refractory materials, which can solve the problems of easy occurrence of safety accidents, poor thermal insulation performance and high impurity content, and achieve good corrosion resistance and safety, good thermal insulation performance and low bulk density. Effect

Active Publication Date: 2014-10-08
河南竹林庆州耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of material has poor thermal insulation performance, low strength, high impurity content, and low refractoriness. Once the working lining material of the ladle is eroded by molten steel or slag, the permanent layer with low refractoriness will be melted away in a short time, resulting in ladle Leakage occurs, which is prone to safety accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A light-weight thermal insulation calcium hexaaluminate castable, comprising the following raw materials in weight percentage:

[0027] 25% ultra-light calcium hexaaluminate with a particle size of 3-6 mm,

[0028] Ultra-light calcium hexaaluminate with a particle size of 1-3 mm 10%,

[0029] 20% ultra-light calcium hexaaluminate with a particle size of 0.088-1 mm,

[0030] Ultra-light calcium hexaaluminate with particle size <88 μm 10%

[0031] Corundum fine powder with particle size <88 μm 15%,

[0032] α-Al 2 o 3 Micronized 10%, and

[0033] Pure calcium aluminate cement 10%;

[0034] 0.12% sodium tripolyphosphate of the total weight of the above-mentioned raw materials was added externally.

[0035] The performance test results are shown in Table 1.

Embodiment 2

[0037] A light-weight thermal insulation calcium hexaaluminate castable, comprising the following raw materials in weight percentage:

[0038] 30% ultra-light calcium hexaaluminate with a particle size of 3-6 mm,

[0039] Ultra-light calcium hexaaluminate with a particle size of 1-3 mm 14%,

[0040] 17% ultra-light calcium hexaaluminate with a particle size of 0.088-1 mm,

[0041] Ultra-light calcium hexaaluminate with particle size <88 μm 21%,

[0042] Corundum fine powder with particle size <88 μm 10%,

[0043] α-Al 2 o 3 Micronized 3%, and

[0044] Pure calcium aluminate cement 5%;

[0045] Externally add 0.16% sodium tripolyphosphate of the total weight of the above-mentioned raw materials.

[0046] The performance test results are shown in Table 1.

Embodiment 3

[0048] A light-weight thermal insulation calcium hexaaluminate castable, comprising the following raw materials in weight percentage:

[0049] 35% ultra-light calcium hexaaluminate with a particle size of 3-6 mm,

[0050] Ultra-light calcium hexaaluminate with a particle size of 1-3 mm 15%,

[0051] 15% ultra-light calcium hexaaluminate with a particle size of 0.088-1 mm,

[0052] Ultra-light calcium hexaaluminate with particle size <88 μm 10%,

[0053] Corundum fine powder with particle size <88 μm 10%,

[0054] α-Al 2 o 3 Micronized 5%, and

[0055] Pure calcium aluminate cement 10%,

[0056] 0.18% sodium tripolyphosphate of the total weight of the above-mentioned raw materials was added externally.

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Abstract

The invention relates to a lightweight insulated calcium hexaluminate castable prepared from the following raw materials by weight percent: 25-35% of super lightweight calcium hexaluminate of which the grain size is 3-6mm, 10-15% of super lightweight calcium hexaluminate of which the grain size is 1-3mm, 15-20% of super lightweight calcium hexaluminate of which the grain size is 0.088-1mm, 0-25% of super lightweight calcium hexaluminate of which the grain size is smaller than 88mu m, 0-25% of corundum fine powder of which the grain size is smaller than 88 mu m, 0-10% of alpha-Al2O3 micro-powder and 5-20% of pure calcium aluminate cement, and in addition, a water reducer which is 0.12-0.18% of total weight of the raw materials. The lightweight insulated calcium hexaluminate castable disclosed by the invention has the advantages of small volume density, good thermal insulating properties, high strength, low impurity content, high refractoriness and strong anti-erosion capability.

Description

technical field [0001] The invention relates to a light-weight thermal insulation calcium hexaaluminate castable, which belongs to the technical field of refractory materials. Background technique [0002] Most of the traditional ladle lining materials are made of alumina-magnesia-carbon bricks and magnesia-carbon bricks. Due to the high carbon content of aluminum-magnesia-carbon bricks and magnesia-carbon bricks, their thermal conductivity is large, which will cause the temperature of the steel shell to be too high, which will easily cause deformation and cracking of the steel shell, and more seriously, it will also cause the temperature of the molten steel to drop too quickly , which is not conducive to the continuous refining outside the furnace, which requires the permanent layer of the ladle to have a good thermal insulation effect. Traditional ladle permanent layer insulation materials mostly use diatomite bricks, asbestos bricks, vermiculite bricks, lightweight clay ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李志强彭从华刘飞飞李济华李焕成
Owner 河南竹林庆州耐火材料有限公司
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