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Magnesium-aluminum-zirconium composite brick with low thermal conductivity and preparation method thereof

A composite brick and magnesium-aluminum technology, applied in the field of refractory materials, can solve the problems of high porosity of low-conductivity magnesium-aluminum-zirconium composite bricks, deformation of the rotary kiln shell, and small thermal conductivity, etc., to achieve low thermal conductivity, good social benefits and Economic benefit and small thermal conductivity effect

Inactive Publication Date: 2017-11-21
TONGDA REFRACTORY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-conductivity magnesium-aluminum-zirconium composite brick of the present invention has high porosity, small bulk density and small thermal conductivity. The low-conductivity magnesium-aluminum-zirconium composite brick is used to prepare a rotary kiln, which effectively solves the problem of high thermal conductivity that causes the temperature of the rotary kiln cylinder to be reduced. Problems of deformation of the rotary kiln shell and energy waste due to high

Method used

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  • Magnesium-aluminum-zirconium composite brick with low thermal conductivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A low-conductivity magnesium-aluminum-zirconium composite brick. In terms of weight percentage, the low-conductivity magnesium-aluminum-zirconium composite brick consists of raw materials: 65% microporous magnesia, 25% high-purity magnesia, 5% fused magnesia-aluminum spinel, Zirconium dioxide 5%; plus pulp waste liquid accounting for 5% of the total weight of the above-mentioned raw materials; wherein, the microporous magnesia is made of microporous magnesia with a particle size of 3mm≤particle size2 o 3 The content is 60%; the bulk density of the fused magnesia-aluminum spinel is 3.2g / cm 3 ; The particle size of the zirconium dioxide 2 Content>90%; the specific gravity of the pulp waste liquid is 1.26g / cm 3 .

[0027] The microporous magnesia is formed by crushing and screening the microporous magnesia synthetic material, and the preparation method of the microporous magnesia synthetic material is as follows:

[0028] (1) Weigh 40wt% light-burned magnesium powder and...

Embodiment 2

[0032] A low-conductivity magnesium-aluminum-zirconium composite brick. In terms of weight percentage, the low-conductivity magnesium-aluminum-zirconium composite brick consists of raw materials: 30% of microporous magnesia, 50% of high-purity magnesia, 10% of fused magnesia-aluminum spinel, 10% of zirconium dioxide; plus 4% of the total weight of the above-mentioned raw materials pulp waste liquid; wherein, the microporous magnesia is made of microporous magnesia with a particle size of 3mm≤particle size2 o 3 The content is 50%; the bulk density of the fused magnesia-aluminum spinel is 3.25g / cm 3 ; The particle size of the zirconium dioxide 2 Content>90%; the specific gravity of the pulp waste liquid is 1.25g / cm 3 .

[0033] The microporous magnesia is formed by crushing and screening the microporous magnesia synthetic material, and the preparation method of the microporous magnesia synthetic material is as follows:

[0034](1) Weigh 10wt% light-burned magnesium powder and ...

Embodiment 3

[0038] A low-conductivity magnesia-aluminum-zirconium composite brick, characterized in that, in terms of weight percentage, the low-conductivity magnesia-aluminum-zirconium composite brick consists of 22% microporous magnesia, 60% high-purity magnesia, and fused magnesia-aluminum spinel 15% limestone, 3% zirconium dioxide; plus pulp waste liquid accounting for 4% of the total weight of the above raw materials; wherein, the microporous magnesia is made of microporous magnesia with 3mm≤particle size2 o 3 The content is 65%; the bulk density of the fused magnesia-aluminum spinel is 3.25g / cm 3 ; The particle size of the zirconium dioxide 2 Content>90%; the specific gravity of the pulp waste liquid is 1.25g / cm 3 .

[0039] The microporous magnesia is formed by crushing and screening the microporous magnesia synthetic material, and the preparation method of the microporous magnesia synthetic material is as follows:

[0040] (1) Weigh 90wt% light-burned magnesium powder and 10% ma...

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Abstract

The invention discloses a magnesium-aluminum-zirconium composite brick with low thermal conductivity. The magnesium-aluminum-zirconium composite brick comprises the following raw materials by weight: 10 to 65% of microporous magnesia, 25 to 65% of high-purity magnesia, 5 to 20% of fused magnesium aluminate spinel and 1 to 10% of zirconium dioxide. The composite brick further comprises waste paper pulp accounting for 2 to 5% of the total weight of the above raw materials. The microporous magnesia is prepared by subjecting a microporous magnesia synthetic material to fragmentation and screening. The magnesium-aluminum-zirconium composite brick with low thermal conductivity in the invention has the advantages of high apparent porosity, low volume density, low thermal conductivity, high-temperature resistance, erosion resistance, scouring resistance and integrated fireproof and heat-insulating functions, is applicable to a high-temperature zone of a rotary kiln, can substantially reduce heat loss in a kiln body and produces good energy-saving and emission-reducing effects.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a low-conductivity magnesium-aluminum-zirconium composite brick and a preparation method thereof. Background technique [0002] Using rotary kiln as a high-temperature kiln to produce refractory raw materials and dispose of waste is currently the most common, economical and environmentally friendly production process. This process has the characteristics of strong raw material adaptability and high resource recovery rate. Due to the high temperature in the high temperature zone of the rotary kiln, some materials are in a semi-molten or fully molten state, the slag content is high, the fluctuation is large, and the viscosity is low. The working environment of the refractory material in the kiln is very harsh, and higher requirements are put forward for the performance of the refractory material. . Magnesium-aluminum-zirconium bricks realize the complement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622
CPCC04B35/0435C04B35/62204C04B2235/3222C04B2235/3244C04B2235/77C04B2235/96C04B2235/9607
Inventor 马淑龙孙艳粉王治峰马飞孔祥魁吕雪锋朱凌云王浩杰高长贺张积礼周新功
Owner TONGDA REFRACTORY TECH CO LTD
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