Iolite-mullite-andalusite thermal-shock-resistant brick and preparation method thereof

A cordierite and andalusite technology is applied in the field of high thermal shock refractory materials for ceramic burners of iron-making hot blast stoves, which can solve the problems of low bulk density, high porosity, softening and fragmentation, and achieve excellent comprehensive performance and extended use. Longevity and effect of improving thermal shock resistance

Inactive Publication Date: 2012-05-02
任健均
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal shock stability of the refractory material can reach more than 120 times, but its load softening temperature and normal temperature compressive strength are still low, and the...

Method used

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  • Iolite-mullite-andalusite thermal-shock-resistant brick and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] A cordierite-mullite-andalusite thermal shock-resistant brick, the proportion of which is: fused mullite: 15wt%, brown corundum: 5wt%, tabular corundum: 32wt%, andalusite: 20wt%, oxidation Aluminium powder: 10wt%, cordierite: 12wt%, clay: 6wt%. The mineral particles are prepared into fine powder by dry blending method; the density of the fine powder is 1.20g / cm 3 The dextrin liquid is mixed and milled uniformly; the milled material is made into a brick with a forming machine, and the brick is dried in a natural drying oven to make the moisture less than 1.0%, and then sintered in a sintering furnace at 1400°C for 16 hours.

Embodiment 2

[0046] A cordierite-mullite-andalusite thermal shock-resistant brick with the following proportions: fused mullite: 42wt%, brown corundum: 5wt%, tabular corundum: 10wt%, andalusite: 15wt%, oxidation Aluminium powder: 10wt%, cordierite: 12wt%, clay: 6wt%. The mineral particles are prepared into fine powder by dry blending method; the density of the fine powder is 1.20g / cm 3 The dextrin liquid is mixed and milled uniformly; the milled material is made into a brick with a forming machine, and the brick is dried in a natural drying oven to make the moisture less than 1.0%, and then sintered in a sintering furnace at 1400°C for 16 hours.

Embodiment 3

[0048] A cordierite-mullite-andalusite thermal shock-resistant brick with the following proportions: fused mullite: 25wt%, brown corundum: 15wt%, tabular corundum: 25wt%, andalusite: 15wt%, oxidation Aluminum powder: 5wt%, cordierite: 12wt%, clay: 3wt%. The mineral particles are prepared into fine powder by dry blending method; the density of the fine powder is 1.20g / cm 3 The dextrin liquid is mixed and milled uniformly; the milled material is made into a brick with a forming machine, and the brick is dried in a natural drying oven to make the moisture less than 1.0%, and then sintered in a sintering furnace at 1400°C for 16 hours.

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Abstract

The invention relates to an iolite-mullite-andalusite thermal-shock-resistant brick, which is characterized by being basically produced by sintering the following base materials for 16 hours at a temperature of 1400 DEG C. The base materials comprise 15-42 wt% of electrofused mullite, 5-18 wt% of brown corundum, 10-32 wt% of plate corundum, 5-20 wt% of andalusite, 3-10 wt% of aluminum oxide micropowder, 5-12 wt% of iolite, and 3-6 wt% of clay; in the finished product of the thermal-shock-resistant brick, Al2O3 is not less than 60 wt%, Fe2O3 is not more than 0.4 wt%, and the sum of K2O and Na2O is not more than 0.3 wt%. According to the iolite-mullite-andalusite thermal-shock-resistant brick and the preparation method thereof, the plate corundum and the brown corundum are adopted, therefore, on basis of improvement in refractoriness under load and high temperature creep property of firebricks, the thermal-shock-resistant stability of the product is improved, and the service life of the iolite-mullite-andalusite thermal-shock-resistant brick serving as the martial of the firebricks in high-temperature-resistant ceramic burners can be obviously prolonged.

Description

Technical field [0001] The invention relates to a heat-insulating refractory material, in particular, the invention relates to a high thermal shock refractory material for ceramic burners of iron-making hot blast furnaces. Background technique [0002] The operating temperature of the ironmaking hot blast furnace in the steel plant is around 1200-1350°C throughout the year, and the process of supplemental cooling makes the temperature in the furnace change drastically, and it needs to withstand the harsh conditions such as the chemical erosion of the dust brought by the blast furnace gas, the strong erosion of the combustion gas and the mechanical load. Refractories for ceramic burners of hot blast stoves are required to have the characteristics of low creep, high load softening temperature, and large heat capacity of common refractory materials, as well as good thermal shock resistance and high strength. [0003] In the prior art, high alumina cordierite refractories are usually u...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 任健均
Owner 任健均
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