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Method for preparing compound lining material of blast furnace

A technology for inner lining and blast furnace, which is applied in the field of preparation of new composite inner lining materials for blast furnaces, can solve problems such as loosening, and achieve the effects of prolonging service life, excellent thermal insulation performance and improving energy saving effect.

Inactive Publication Date: 2010-01-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the refractory materials used in this part mainly include: high alumina bricks, clay bricks impregnated with phosphate, corundum bricks, aluminum carbon bricks, silicon nitride or silicon nitride combined silicon carbide bricks, graphite-silicon carbide bricks, carbon bricks etc., but it is inevitable that there will be problems of looseness and through-seams

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The chemical formula and particle gradation of the bone powder used are: (weight%) high alumina bauxite clinker: 3-1.43mm 28%, 1.43-0.45mm 6%, 0.45-0.088mm 19%, <0.088mm 8%, silicon carbide : 3-1.43mm 8%, 1.43-0.45mm 2.5%, 0.45-0.088mm 5%, <0.088mm 2.5%, CA50 refractory cement: <0.088mm 7%, metal silicon powder: <0.088mm 5.5%, silicon Ash: <0.088mm2.5%, artificial graphite: <0.088mm6%.

[0025] The type and amount of additives used: (% by weight)

[0026] STP+NTD: 0.1%+0.05%, water: 8%.

[0027] Fully mix the above-mentioned bone powder and admixture evenly;

[0028] The above-mentioned uniformly mixed slurry is poured into a mold for molding, and after pouring and forming, it is cured naturally until the initial setting. After the initial setting, it is cured with water at room temperature at 20°C, then demoulded, and baked at 110°C for 24 hours to obtain the Al of the present invention. 2 o 3 -SiC-C composite lining material.

Embodiment 2

[0030] The chemical formula and particle gradation of bone powder used are: (% by weight)

[0031] High alumina bauxite clinker: 3-1.43mm 30%, 1.43-0.45mm 5%, 0.45-0.088mm 20%, <0.088mm 7%, silicon carbide: 3-1.43mm 8.5%, 1.43-0.45mm 2%, 0.45-0.088mm 4.5%, <0.088mm2%, CA50 refractory cement: <0.088mm 8%, metal silicon powder: <0.088mm 5%, silica fume: <0.088mm3%, artificial graphite: <0.088mm 5%.

[0032] The type and amount of additives used: (% by weight)

[0033] STP+PAANa: 0.1%+0.03%, water: 9%.

[0034] Fully mix the above-mentioned bone powder and admixture evenly;

[0035] Inject the above uniformly mixed slurry into a mold for molding, after pouring and forming, it will be cured naturally until the initial setting, after the initial setting, it will be cured with wet water at room temperature at 20°C, then demolded, and baked at 110°C for 24 hours to obtain the Al of the present invention. 2 o 3 -SiC-C composite lining material.

Embodiment 3

[0037] The chemical formula and particle gradation of bone powder used are: (% by weight)

[0038] High alumina bauxite clinker: 3-1.43mm 31%, 1.43-0.45mm 4.5%, 0.45-0.088mm 21%, <0.088mm 6%, silicon carbide: 3-1.43mm 7%, 1.43-0.45mm 3% , 0.45-0.088mm 3.5%, <0.088mm 1.5%, CA50 refractory cement: <0.088mm 7.5%, metal silicon powder: <0.088mm 4.5%, silica fume: <0.088mm 3.5%, artificial graphite: <0.088mm 7 %.

[0039] The type and amount of additives used: (% by weight)

[0040] STP: 0.2%, water: 10%.

[0041] Fully mix the above-mentioned bone powder and admixture evenly;

[0042] The above-mentioned uniformly mixed slurry is poured into a mold for molding, and after pouring and forming, it is cured naturally until the initial setting. After the initial setting, it is cured with water at room temperature at 20°C, then demoulded, and baked at 110°C for 24 hours to obtain the Al of the present invention. 2 o 3 -SiC-C composite lining material.

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Abstract

The invention belongs to the field of fireproof materials and relates to a method for preparing a novel compound lining material used in a blast furnace, in particular to a method for preparing a nonmetal compound lining material used in a furnace body of the blast furnace. The method comprises the following steps: using high-aluminum alumina chamotte, carborundum, metallic silicon powder, silicon ash and artificial graphite as main raw materials, using CA50 fireproof cement as a bonding agent, adding a right amount of admixture, and after mixing and smelting, injecting pulp into a relevant mould for moulding, curing for days and then stripping and baking to obtain the Al2O3-SiC-C compound lining material. The method is favorable to constructing special-shaped brick furnace linings at the weak positions of the furnace body, such as special-shaped edges, corners, holes and the like and enhancing the construction quality, and the whole furnace lining which has no seam after being poured and has uniform structure can not generate looseness and penetrating seams when being heated and used; the method prolongs the service life of the furnace lining, provides superior thermal insulation performance to the furnace body and obviously enhances the effect of energy saving. The compound lining material prepared by using the invention can be widely applied to the furnace abdomen, the furnace waist and the lower part of the furnace body of a smelting blast furnace.

Description

technical field [0001] The invention belongs to the field of refractory materials, relates to a cooling and inner lining component of a blast furnace, and provides a preparation method of a novel composite inner lining material of a blast furnace, and the process is simple and easy to control. Background technique [0002] The longevity of blast furnaces is not only a requirement for iron and steel complexes to maintain stable and balanced production, but also a requirement for reducing production costs and improving market competitiveness. Therefore, longevity of blast furnaces is one of the most concerned issues for ironworkers all over the world. The life of contemporary blast furnaces mainly depends on the lower part of the shaft (including the furnace waist and bosh). The lower part of the furnace body is mainly affected by the friction and scour of the rising gas flow, the erosion of primary slag, the deposition of carbon, and the damage of alkali metals and other harm...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 徐利华郝洪顺尹航仉小猛
Owner UNIV OF SCI & TECH BEIJING
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