Corundum-mullite heat-insulating brick

A technology of mullite and thermal insulation bricks, which is applied in the field of refractory materials, can solve the problems of large thermal expansion coefficient, poor thermal stability, and short service life, and achieve the effects of improving thermal shock stability, reasonable organizational structure, and preventing cracking

Inactive Publication Date: 2008-10-29
宜兴市中能耐火制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional heavy corundum bricks, magnesia bricks, and spinel bricks have large lining heat capacity, high thermal conductivity, and poor thermal stability. They are used in batch kilns with very high energy consumption and short service life.
In recent years, alumina hollow ball bricks have been used in batch kilns. Although the problem of high thermal conductivity has been solved to a certain extent, due to the large thermal expansion coefficient, the temperature rises repeatedly during use, and it is easily damaged during the cooling process and has a short service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1, corundum-mullite insulation brick, the weight ratio of each component is (%):

[0019] Fused white corundum <325 mesh 35%

[0020] αAl 2 o 3 <325 mesh 25%

[0021] γAl 2 o 3 <10μm 15%

[0022] Sillimanite <120 mesh 15%

[0023] Suzhou No. 1 mud <280 mesh 10%

[0024] Plus: Water 28%

[0025] Polystyrene foam ball 0.5-2mm volume ratio is 0.16m 2 / 200kg

[0026] Sawdust 0-0.5mm volume ratio is 0.15m 2 / 200kg

[0027] Before foaming polystyrene foam balls, put 3:1 Al 2 o 3 and SiO 2 Roll a layer of powder in the mixed micropowder to prevent sticking, weigh 200kg of powder according to the above formula and carry out dry mixing first for later use. Pour polystyrene foam balls and wood chips into a forced mixer and mix well, add part of the water while stirring, pour in the dry powder, and finally pour in all the remaining water, stir, and release the trapped material for one day. Vacuum extrusion. The shaped bricks are...

Embodiment 2

[0028] Example 2, corundum-mullite thermal insulation brick, the manufacturing method is the same as that of Example 1, and the weight ratio of each component is (%):

[0029] Fused white corundum <325 mesh 32%

[0030] αAl 2 o 3 <325 mesh 28%

[0031] γAl 2 o 2 <10μm 12%

[0032] Sillimanite <120 mesh 16%

[0033] Suzhou No. 1 mud <280 mesh 12%

[0034] Plus: Water 26%

[0035] Polystyrene foam ball 0.5-2mm volume ratio is 0.155m 2 / 200kg

[0036] Sawdust 0-0.5mm volume ratio is 0.158m 2 / 200kg

Embodiment 3

[0037] Embodiment 3, corundum-mullite thermal insulation brick, the manufacturing method is the same as that of Embodiment 1, and the weight ratio of each component is (%):

[0038] Fused white corundum <325 mesh 38%

[0039] αAl 2 o 3 <325 mesh 22%

[0040] γAl 2 o 3 <10μm 18%

[0041] Sillimanite <120 mesh 13%

[0042] Suzhou No. 1 mud <280 mesh 9%

[0043] Plus: Water 29%

[0044] Polystyrene foam ball 0.5-2mm volume ratio is 0.165m 2 / 200kg

[0045] Sawdust 0-0.5mm volume ratio is 0.145m 2 / 200kg

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PUM

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Abstract

The heat insulating corundum-mullite brick has the material composition comprising fused white corundum powder finer than 325 mesh 30-40 wt%, alpha-alumina powder finer than 325 mesh 20-30 wt%, gamma-alumina powder finer than 10 microns 20-30 wt%, sillimanite powder finer than 120 mesh 10-20 wt%, No. 1 Suzhou clay powder finer than 280 mesh 8-15 wt% and water 25-30 wt%, as well as foamed polystyrene balls of 0.5-2 mm size and saw dust in 0-0.5 mm size in certain amount. The heat insulating corundum-mullite brick has long service life, capacity of resisting high temperature up to 1700 deg.c, high resistance to various kinds one atmosphere, low heat conductivity, low heat capacity and excellent heat shock stability.

Description

technical field [0001] The invention relates to a refractory material, in particular to a lining material for various flame furnaces and electric furnaces with an operating temperature above 1700°C. technical background [0002] Traditional heavy corundum bricks, magnesia bricks, and spinel bricks have large lining heat capacity, high thermal conductivity, and poor thermal stability. They are used in batch kilns with very high energy consumption and short service life. In recent years, alumina hollow ball bricks have been used in batch kilns. Although the problem of high thermal conductivity has been solved to a certain extent, due to the large thermal expansion coefficient, the temperature rises repeatedly during use, and it is easily damaged during the cooling process and has a short service life. . Contents of the invention [0003] The purpose of this invention is to overcome the above disadvantages and provide a corundum-mullite insulation brick with a long service l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/10C04B38/02C04B38/06
Inventor 李洪明方茂云
Owner 宜兴市中能耐火制品有限公司
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