Silica heat-proof firebrick

A heat-insulating refractory brick and siliceous technology, applied in the field of refractory materials, can solve the problems of low deformation temperature under load, high thermal conductivity, easy shrinkage, etc., and achieve low iron content, high compressive strength and good thermal stability. Effect

Active Publication Date: 2008-03-12
山西盂县西小坪耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects of the existing clay-based heat-insulating refractory bricks, such as low load deformation temperature, easy shrinkage at high temperature, high thermal conductivity, and poor heat preservation effect, the present invention provides a silicon-based heat-insulating refractory brick

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Silica heat insulating refractory bricks, made of the following raw materials in weight percentages, SiO 2 The content is 97.5% of silica fine powder 81%. The silica fine powder is crushed by five sets of silica. SiO 2 19% of perlite with a content of 83%, plus the following auxiliary materials accounting for the total weight of the above main raw materials: 0.45% of iron scale powder, the content of ferrous oxide in iron scale powder is not less than 65%, 0.9% of cement, and 6.5% of milk of lime , its specific gravity is 1.24g / cm 3 , pulp 1.95%, its specific gravity is 1.20g / cm 3 , the pH is 4; the silica fine powder is composed of two parts, wherein silica particles with a particle size range of 1-0.088mm account for 5%, and particles with a particle size range of <0.088mm account for 95%;

[0015] Add silica fine powder and perlite into the wet mill in proportion, then add iron scale powder and cement for dry milling for 1 minute, add water accounting for 1.8% of t...

Embodiment 2

[0017] Silica heat insulating refractory bricks, made of the following raw materials in weight percentages, SiO 2 85% of silica fine powder with a content of 98%, said silica fine powder is crushed from five sets of silica, SiO 2 15% of perlite with a content of 85%, plus the following auxiliary materials accounting for the total weight of the above main raw materials: 0.55% of iron scale powder, the content of ferrous oxide in iron scale powder is not less than 65%, 1.1% of cement, 7.5% of milk of lime , its specific gravity is 1.28g / cm 3 , pulp 2.2%, its specific gravity is 1.24g / cm 3 , the pH is 5; the silica fine powder is composed of two parts, wherein silica particles with a particle size range of 1-0.088mm account for 15%, and particles with a particle size range of <0.088mm account for 85%;

[0018] Add silica fine powder and perlite into the wet mill in proportion, then add iron scale powder and cement for dry milling for 2 minutes, add water accounting for 2.2% of ...

Embodiment 3

[0020] Silica heat insulating refractory bricks, made of the following raw materials in weight percentages, SiO 2 83% silica fine powder with a content of 98.5%, the silica fine powder is crushed by five sets of silica, SiO 2 17% of perlite with a content of 87%, plus the following auxiliary materials accounting for the total weight of the above-mentioned main raw materials: 0.50% of iron scale powder, the content of ferrous oxide in iron scale powder is not less than 65%, 1.0% of cement, and 7.0% of milk of lime , its specific gravity is 1.25g / cm 3 , pulp 2.0%, its specific gravity is 1.23g / cm 3 , the pH is 4; the silica fine powder is composed of two parts, wherein silica particles with a particle size range of 1-0.088mm account for 10%, and particles with a particle size range of <0.088mm account for 90%;

[0021] Add silica fine powder and perlite in proportion to wet milling, then add iron scale powder and cement for dry milling for 1 minute, add water accounting for 2....

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Abstract

The present invention relates to the fireproof material technology field, in particular to a silicon heat insulation fireproof brick adaptable to be used in coke oven and carbon stove. The present invention can solve the shortcomings in the prior clay heat-insulation and fireproof brick that load distortion temperature is low; the material is easy to be shrunk in the high temperature; the heat conductivity ratio is much larger and the heat preservation effect is much worse and so on. The components and the relative weight ratio in the present invention are that: 81-85 percent of silica powder, 15-19 percent of perlite, and the following assistant materials, whose weight ratio occupied in the main raw materials is as follow: 045-0.55 percent of iron scale powder, 0.9-1.1 percent of cement, 6.5-7.5 percent of lime milk, 1.95-2.2 percent of paper slurry. The silica powder and the perlite with the stated matched ratio are added into a humid grinder and then the iron scale powder and the cement are added into to be grinded for 1-2 minutes; and then the water with the weight ratio occupied in the main raw material 1.8-2.2 percent is added, and then the lime milk is also added to be grinded and pressed for 10-15 minutes. Finally, the paper slurry is added to be grinded and pressed for 10-15 minutes. The mixture is taken out from the grinder to be molded. Each physical and chemical index of the silicon heat insulation fireproof brick in the present invention is better than the national standard; the present invention has the advantages of heat-resisting, low heat conductivity, low iron content, large compression strength and much better heat stability and so on. The present invention can be directly used as the inner bushing for the industrial stove.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a silicon heat-insulating refractory brick suitable for coke ovens and carbon furnaces. Background technique [0002] At present, the insulation bricks commonly used in industrial furnaces such as coke ovens and carbon furnaces are clay heat-insulating refractory bricks, which have the following disadvantages in actual use: 1. The deformation temperature under load is only 1200-1300 °C, which cannot be used in furnaces. The place is in a high temperature environment for a long time, otherwise the service life of the furnace body will be reduced, such as for a large-span furnace roof, directly built on the hot surface in contact with the furnace gas; 2. It is easy to shrink at high temperature, and the volume changes greatly, which is extremely It is easy to cause cracking of the furnace lining; 3. The porosity is small, and the thermal conductivity is large, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B14/06
Inventor 武本有武根怀郝良军韩八斤尹建斌
Owner 山西盂县西小坪耐火材料有限公司
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