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Bake-free casting material for ladle online roaster cladding lining and preparation method thereof

A roaster and castable technology, applied in the field of non-metallic refractory materials, can solve the problems of poor thermal stability, castable shedding and melting loss of the steel shell and cover lining, and achieve high bonding strength and thermal shock resistance Good performance and long service life

Inactive Publication Date: 2013-09-25
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the inner lining of the ladle cover is generally knotted with lightweight high-aluminum castables. The common technical problems are: the new inner liner castable for the cover has low bonding strength and poor thermal stability. In the initial stage, due to the rapid evaporation of water and the sudden change of temperature, the casting material for the lining liner caused the partial fall off of the new lining castable material for the cover, and caused the deformation and melting loss of the steel shell of the cover, and the deformation of the steel shell of the cover aggravated the internal damage of the cover. The falling off of the lining castable forms a vicious circle, which leads to a low service life of the inner lining of the cover, generally about 30 days

Method used

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  • Bake-free casting material for ladle online roaster cladding lining and preparation method thereof
  • Bake-free casting material for ladle online roaster cladding lining and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A non-bake castable for the inner lining of the ladle on-line roaster cover, which consists of the following materials by weight percentage:

[0029] 20% of sintered mullite with 5mm≦particle size2 o 3 Differential 6.0%, silicon micropowder particle size ≦0.047mm 4.0%, metal aluminum powder particle size ≦0.165mm 3.5%, pure calcium aluminate cement 3.0%, heat-resistant steel fiber 2.5%.

[0030] The sintered mullite is selected from the grade M70, its AI 2 o 3 The content is 70.1%, SiO 2 The content is 27.6%, Fe 2 o 3 The content is 0.60%, R 2 The O content is 0.19%, and the bulk density is 2.95g.cm -3 , the apparent porosity is 1.53%, the water absorption is 0.4%, and the refractoriness is >1790°C.

[0031] The andalusite, its AI 2 o 3 The content is 58.15%, Fe 2 o 3 The content is 0.83%, R 2 The O content is 0.41%, the linear expansion rate at 1000°C is 1.16%, and the refractoriness is >1830°C.

[0032] The heat-resistant steel fiber has a cross-section of ...

Embodiment 2

[0040] Others are the same as embodiment 1, the difference is:

[0041] A non-bake castable for the inner lining of the ladle on-line baker, which is composed of the following materials by weight percentage: 25% of sintered mullite with a particle size of 5mm ≤ 8mm, sintered mullite with a particle size of 3mm ≤ 5mm Sintered mullite 12%, 1mm≦particle size2 o 3 Differential 7.0%, silica powder with particle size ≦0.047mm 2.0%, metal aluminum powder with particle size ≦0.165mm 4.0%, pure calcium aluminate cement 3.5%, heat-resistant steel fiber 1.5%.

[0042] The sintered mullite is selected from the grade M73, whose AI 2 o 3 The content is 73.2%, SiO 2 The content is 21.9%, Fe 2 o 3 The content is 1.25%, R 2 The O content is 0.25%, and the bulk density is 2.91g.cm -3 , the apparent porosity is 2.91%, the water absorption is 1.0%, and the refractoriness is >1790°C.

[0043] The andalusite, its AI 2 o 3 The content is 55.69%, Fe 2 o 3 The content is 0.37%, R 2 The O ...

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Abstract

The invention relates to bake-free casting material for ladle online roaster cladding lining and a preparation method thereof, belonging to the technical field of nonmetal material fireproof materials; the preparation method comprises the following steps: using sintered mullite and andalusite as raw materials, and using hydration heating action of metal aluminum powder and water at a room temperature and action mechanisms of self-reaction, self-sintering and self-expansion of Al203 and SiO2 of ingredient on a low temperature condition so as to manufacture a product; the bake-free casting material manufactured by above-mentioned components has excellent performances such as large combination strength, good thermal shock resistance and the like and is used for manufacturing the ladle online roaster cladding lining; in addition, life cycle is more than 3 months.

Description

technical field [0001] The invention relates to a non-bake castable for the inner lining of the cover of a ladle online baker and a preparation method thereof, belonging to the technical field of non-metallic refractory materials. Background technique [0002] The ladle online baker under the converter furnace is used for the baking of the ladle lining used in the turnover of steelmaking production. It is baked on high fire for 10-20 minutes each time, and the baking is stopped when the temperature of the ladle lining is higher than 900°C, that is, it is baked in the high fire Toggles between toasting and off toasting. At present, the inner lining of the cover of the ladle online roaster is generally knotted with lightweight high-alumina castables. The common technical problems are: the new inner liner castables for the cover, the castables have low bonding strength and poor thermal stability, and they are put into use. In the initial stage, due to the rapid evaporation of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 武光君
Owner LAIWU IRON & STEEL GRP
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