Low-heat-conduction silicon mullite brick and preparation method thereof

A silicon molybdenum brick and low thermal conductivity technology, which is applied in the field of low thermal conductivity silica molybdenum brick and its preparation, can solve the problems of high equipment temperature and high thermal conductivity of silica molybdenum brick, and achieve light bulk density, scientific and simple preparation method, and thermal stability excellent effect

Active Publication Date: 2012-07-25
无锡远能耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although silica bricks have many advantages, they also have disadvantages.
Among them, the biggest problem is that the thermal conductivity of silicon molybdenum bricks is too high, which can easily cause the equipment temperature to be too high.

Method used

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  • Low-heat-conduction silicon mullite brick and preparation method thereof
  • Low-heat-conduction silicon mullite brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 5% of 3-5mm bauxite (unit is percentage by weight, the same below), 35% of 1-3mm bauxite, 15% < 1mm bauxite, 15% of corundum fine powder, 20% of silicon carbide fine powder and 10% binder, pour into the mixer and mix the dry material for 5 minutes, add tap water with 1% of the total weight of raw materials and stir for 10 minutes, and then trap the material for 3 hours, and make adobe by a press, and put the adobe at 180 degrees Bake, bake for 8 hours, then send it into a tunnel kiln and burn for 48 hours at 1000 degrees; wherein the preparation method of the binder is: 5 parts by weight of aluminum orthophosphate, 1 part of oxalic acid, 1 part 1 part of mullite fine powder and 1 part of methyl cellulose are crushed, mixed for 8 minutes, then added with 5% water of the total mass of the mixture, and stirred for 5 minutes.

Embodiment 2

[0019] Take 8% of 3-5mm bauxite (unit is percentage by weight, the same below), 32% of 1-3mm bauxite, 16%<1mm bauxite, 12% of corundum fine powder, 18% of silicon carbide fine powder and 18% binder, pour into the mixer and mix the dry material for 6 minutes, add tap water with 2% of the total weight of the raw materials and stir for 12 minutes, and then trap the material for 3 hours, and make bricks through a press, and put the bricks at 190 degrees Bake, bake for 10 hours, then send it into a tunnel kiln and burn for 52 hours at 1050 degrees; wherein the binder preparation method is: 6 parts by weight of aluminum orthophosphate, 2 parts of oxalic acid, 13 1 part of mullite fine powder and 2 parts of methyl cellulose are crushed, mixed for 9 minutes, mixed with 6% water of the total mass of the mixture, and stirred for 6 minutes.

Embodiment 3

[0021] Take 10% of 3-5mm bauxite (unit is percentage by weight, the same below), 30% of 1-3mm bauxite, 17%<1mm bauxite, 10% of corundum fine powder, 13% of silicon carbide fine powder and 20% binder, pour into the mixer and mix the dry material for 9 minutes, add tap water with 3% of the total weight of the raw materials and stir for 15 minutes, and then trap the material for 4 hours, and make adobe by a press, and put the adobe at 200 degrees Bake, bake for 12 hours, then send it into a tunnel kiln and burn for 54 hours at 1100 degrees; wherein the preparation method of the binder is: 9 parts by weight of aluminum orthophosphate, 6 parts of oxalic acid, 23 One part of mullite fine powder and three parts of methyl cellulose were crushed, mixed for 10 minutes, then added with 7% water of the total mass of the mixture, and stirred for 8 minutes.

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Abstract

The invention discloses a low-heat-conduction silicon mullite brick which comprises the following components by weight percent: 45-70% of alumina, 5-15% of corundum fine powder, 10-20% of silicon carbide fine powder and 8-20% of bonding agent. The invention also discloses the preparation method of the low-heat conduction silicon mullite brick. The low-heat conduction silicon mullite brick provided by the invention is not covered by a kiln coating, and has the characteristics of strong wear resistance, stripping resistance and acid-base resistance capabilities and good heat stability; and compared with the traditional technology, the low-heat conduction silicon mullite brick prepared by the method disclosed by the invention is low in thermal conductivity coefficient and low in volume density, and reduces the temperature outside a barrel by about 100 DEG C. The preparation method of the silicon mullite brick provided by the invention is simple and scientific, free from pollution in the implementation process and suitable for wide use.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a silica molybdenum brick with low thermal conductivity and a preparation method thereof. Background technique [0002] Magnesia-chrome bricks were used in the firing zone and transition zone of large cement rotary kilns. Since the 1980s, silica molybdenum bricks have been gradually introduced into use. Because of their strong high temperature resistance, wear resistance, corrosion resistance, and good thermal conductivity, silica molybdenum bricks have become an ideal choice for cement rotary kilns today. However, although silica bricks have many advantages, they also have disadvantages. Among them, the biggest problem is that the thermal conductivity of silica bricks is too high, which can easily cause the temperature of the equipment to be too high. Contents of the invention [0003] Purpose of the invention: the purpose of the present invention is to provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 姚伯洪路盘根罗佳
Owner 无锡远能耐火材料有限公司
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