CN104876603A - Heat-insulation refractory brick manufacturing method - Google Patents

Abstract

The invention discloses a heat-insulation refractory brick manufacturing method and relates to the technical field of manufacturing of refractory materials. The heat-insulation refractory brick manufacturing method includes preparing, by weight, 25-35 parts of calcined bauxite, 30-40 parts of silica powder, 15-20 parts of combined clay and 5-8 parts of calcium aluminate cement, mixing, making blank, drying and baking. Compared with the prior art, the heat-insulation refractory brick manufacturing method is high in compression strength, resistant to high temperature and low in heat conductivity and is good in heat insulation effect as a heat-insulation material of a boiler wall, and the boiler using the heat-insulation refractory brick keeps heat long and energy resource is saved.

Description

The preparation method of insulating fire brick

Technical field

The present invention relates to refractory materials manufacturing technology field, especially a kind of preparation method of insulating fire brick.

Background technology

The thermofin of boiler setting and can not play the effect of heat insulating by the liner of high temperature molten slag and aggressive gas effect, reduce boiler heat lost by radiation, save energy, this thermofin refractory brick used requires that compressive strength is high, high temperature resistant, thermal conductivity is low, and the refractory brick compressive strength of producing at present is high, high temperature resistant, but thermal conductivity is high, insulating layer material as boiler setting can cause boiler effect of heat insulation poor, and rapid heat dissipation, wastes energy.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of preparation method of insulating fire brick, with the problem that the refractory brick thermal conductivity solving production is at present high.

In order to solve the problem, the technical solution used in the present invention is: the preparation method of this insulating fire brick, comprises the raw material of following weight part: bauxite clinker 25 parts ~ 35 parts, ground silica 30 parts ~ 40 parts, bonding clay 15 parts ~ 20 parts, aluminous cement 5 parts ~ 8 parts;

Operation steps is as follows:

A. bauxite clinker, ground silica, bonding clay, aluminous cement is taken by the weight part of above-mentioned each raw material, for subsequent use;

B. described bauxite clinker, described ground silica are put into mixer, add the water accounting for raw material gross weight 3% ~ 5%, stir 5min ~ 8min, then add described bonding clay and described aluminous cement and be uniformly mixed, obtaining compound;

C. adopt brick pressing machine by the compression moulding of step b gained compound, make adobe;

D. adobe is dried to water ratio lower than 7% at 80 DEG C ~ 120 DEG C temperature;

E. calcining kiln is put in the adobe of steps d gained to sinter at 1300 DEG C ~ 1400 DEG C temperature, obtain this insulating fire brick.

Described bauxite clinker, is called for short high aluminium material, the various high alumina bricks manufactured with its grog, and be metallurgical industry and the widely used fire-resistant or impregnating material of other industry, fire-resistant effect is very remarkable.

Described silica, also claims quartzite, and essential mineral is quartzy SiO2, and silica is the main raw material of refractory materials, and its thermal conductivity is low, industrial for glass, pottery, silicate cement etc.

Described bonding clay, is mainly kaolinite composition, is a kind of high plasticity clay, has good plasticity-, good associativity, dispersiveness, rheological.Bonding clay is a kind of important bonding agent, in order to improve the intensity of goods, regulates sintering temperature, increases sintering strength and extrudate density, improves processing workability.

Described aluminous cement, it coordinates by a certain percentage with calcium carbonate (Wingdale) with natural bauxite grog or commercial alumina, makes, in refractory materials, be commonly used for bonding agent through calcining or electric smelting.

Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect:

The present invention adopts bauxite clinker and ground silica to be main raw material, bonding clay and aluminous cement are bonding agent, through batching, batch mixing, base, drying, fire insulating fire brick, this insulating fire brick compressive strength is high, high temperature resistant, thermal conductivity is low, as the insulating layer material good heat-insulation effect of boiler setting, boiler is dispelled the heat slow, save energy.

Embodiment

Below in conjunction with specific embodiment, the invention will be further described:

Embodiment 1

A preparation method for insulating fire brick, comprises the raw material of following weight part: bauxite clinker 250 kilograms, ground silica 300 kilograms, bonding clay 150 kilograms, aluminous cement 50 kilograms;

Operation steps is as follows:

A. bauxite clinker, ground silica, bonding clay, aluminous cement is taken by the weight part of above-mentioned each raw material, for subsequent use;

B. bauxite clinker, ground silica are put into mixer, add the water accounting for raw material gross weight 3%, stir 5min, then add bonding clay and aluminous cement and be uniformly mixed, obtaining compound;

C. adopt brick pressing machine by the compression moulding of step b gained compound, make adobe;

D. adobe is dried to water ratio lower than 7% at 80 DEG C of temperature;

E. calcining kiln is put in the adobe of steps d gained to sinter at 1200 DEG C of temperature, obtain this insulating fire brick.

Embodiment 2

A preparation method for insulating fire brick, comprises the raw material of following weight part: bauxite clinker 350 kilograms, ground silica 400 kilograms, bonding clay 200 kilograms, aluminous cement 80 kilograms;

Operation steps is as follows:

A. bauxite clinker, ground silica, bonding clay, aluminous cement is taken by the weight part of above-mentioned each raw material, for subsequent use;

B. bauxite clinker, ground silica are put into mixer, add the water accounting for raw material gross weight 5%, stir 8min, then add bonding clay and aluminous cement and be uniformly mixed, obtaining compound;

C. adopt brick pressing machine by the compression moulding of step b gained compound, make adobe;

D. adobe is dried to water ratio lower than 7% at 120 DEG C of temperature;

E. calcining kiln is put in the adobe of steps d gained to sinter at 1300 DEG C of temperature, obtain this insulating fire brick.

Claims (1)

1. a preparation method for insulating fire brick, is characterized in that the raw material comprising following weight part: bauxite clinker 25 parts ~ 35 parts, ground silica 30 parts ~ 40 parts, bonding clay 15 parts ~ 20 parts, aluminous cement 5 parts ~ 8 parts;

Operation steps is as follows:

A. bauxite clinker, ground silica, bonding clay, aluminous cement is taken by the weight part of above-mentioned each raw material, for subsequent use;

B. described bauxite clinker, described ground silica are put into mixer, add the water accounting for raw material gross weight 3% ~ 5%, stir 5min ~ 8min, then add described bonding clay and described aluminous cement and be uniformly mixed, obtaining compound;

C. adopt brick pressing machine by the compression moulding of step b gained compound, make adobe;

D. adobe is dried to water ratio lower than 7% at 80 DEG C ~ 120 DEG C temperature;

E. calcining kiln is put in the adobe of steps d gained to sinter at 1200 DEG C ~ 1300 DEG C temperature, obtain this insulating fire brick.