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Magnesium three-layer composite brick and preparation method thereof

A layer composite, magnesia technology, applied in the field of magnesia three-layer composite bricks and its preparation, can solve the problems of increased heat dissipation of the kiln shell, increased heat consumption of clinker, and increased temperature of the supporting wheel tiles, etc., to achieve good refractory insulation Thermal effect, prolonging the service life of equipment and saving energy consumption

Inactive Publication Date: 2012-07-18
郴州市恒达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing refractory bricks and heat insulation bricks are made of a single material. When using them, bricks with various properties need to be used together. If they are used on relatively fixed equipment, such as tunnel kilns and downdraft kilns, they can meet the requirements. , but on some relatively moving equipment, such as a rotary kiln, it is difficult to meet the requirements when used together
Some manufacturers and research units have conducted research and research on this, and have introduced some composite bricks that combine heavy materials and light materials. However, due to the low structural strength of the light parts, they cannot meet the requirements for use, and the The light part is easy to react due to material problems, which affects product performance and use effect, so it has not been widely promoted, and heavy bricks are still the main ones
[0003] Taking the 10,000t / d rotary kiln of Conch Group as an example, spinel bricks are used in the front transition zone, and magnesia-chrome bricks are used in the firing zone. Due to the large thermal conductivity of spinel bricks in the front transition zone and magnesia-chrome bricks in the firing zone (≥ 2.7W / m·K), so that the temperature of the outer wall of the kiln shell is relatively high (about 380°C, and it can reach 420°C at high temperature), which will increase the heat dissipation of the kiln shell on the one hand, thereby increasing the heat consumption of clinker. It will cause an increase in the unit cost of clinker; on the other hand, it is very easy to cause the cylinder to expand due to heat, resulting in an increase in the temperature of the supporting wheel in the middle of the kiln, especially in the later period of use or in summer, which will bring great hidden dangers to the normal operation of the equipment.
The overheating of the cylinder increases the damage probability of mechanical equipment and accelerates the deformation of the cylinder, and the deformation of the cylinder accelerates the mechanical damage of the inner lining. The result is brick falling and kiln shutdown, which affects the operation rate of the cement rotary kiln

Method used

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  • Magnesium three-layer composite brick and preparation method thereof
  • Magnesium three-layer composite brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, the magnesia three-layer composite brick of this embodiment includes a heavy working layer 1, a light heat insulating layer 3, and a transition layer 2 between the heavy working layer 1 and the light heat insulating layer 3.

[0023] in:

[0024] The particle size distribution and mass percentage of the raw materials used in the heavy working layer 1 are: fused magnesia with a particle size greater than 1mm: 45%; fused magnesia with a particle size less than 1mm and greater than 325 mesh: 25%; Fused magnesium powder for 325 mesh: 30%. The binding agent adopted during material preparation is magnesium sulfate solution, and its weight is 3% of the weight of the heavy working layer.

[0025] The particle size distribution and mass percentage of the raw materials used in the transition layer 2 are: sintered spinel with a particle size larger than 1mm: 45%; sintered spinel with a particle size smaller than 1mm and larger than 325 mesh: 25%; Purp...

Embodiment 2

[0034] Such as figure 1 As shown, the magnesia three-layer composite brick of this embodiment includes a heavy working layer 1, a light heat insulating layer 3, and a transition layer 2 between the heavy working layer 1 and the light heat insulating layer 3.

[0035] in:

[0036] The particle size distribution and mass percentage of the raw materials used in the heavy working layer 1 are: fused magnesia with a particle size greater than 1mm: 50%; fused magnesia with a particle size less than 1mm and greater than 325 mesh: 20%; Fused magnesia for 325 mesh: 30%. The binding agent adopted during material preparation is magnesium sulfate solution, and its weight is 2% of the weight of the heavy working layer.

[0037] The particle gradation and mass percentage of the raw materials used in the transition layer 2 are: fused spinel with a particle size greater than 1mm: 50%; fused spinel with a particle size less than 1mm and greater than 325 mesh: 20%; Sintered spinel powder with a...

Embodiment 3

[0046] Such as figure 1 As shown, the magnesia three-layer composite brick of this embodiment includes a heavy working layer 1, a light heat insulating layer 3, and a transition layer 2 between the heavy working layer 1 and the light heat insulating layer 3.

[0047] in:

[0048] The particle size distribution and mass percentage of the raw materials used in the heavy working layer 1 are as follows: sintered magnesia with a particle size greater than 1mm: 55%; sintered magnesia with a particle size less than 1mm and greater than 325 mesh: 15%; Purpose Sintered magnesium powder: 30%. The binding agent that adopts when preparing materials is yellow dextrin solution, and its weight is 2% of heavy working layer weight.

[0049] The gradation and mass percentage of raw material particles used in the transition layer 2 are: sintered spinel hollow spheres with a particle size of 0.2-5 mm: 55%; sintered spinel powder with a particle size of 325 mesh: 45%. The binding agent that ado...

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Abstract

The invention provides a magnesium three-layer composite brick with high wear resistance, fire resistance, structural strength and heat preservation and thermal insulation properties and a preparation method thereof. The fire-resistant and thermal insulation integrated functions of the composite brick are realized, and the energy-saving effect of a rotary kiln is improved. The magnesium three-layer composite brick comprises a heavy working layer prepared from a magnesium material, a light thermal insulation layer prepared from electro-fused hollow spheres, and a transition layer which is positioned between the heavy working layer and the light thermal insulation layer and prepared from spinel or magnesium-aluminum-chromium or magnesium-aluminum-titanium or magnesium-spinel-zirconium. The transition layer is introduced into the magnesium three-layer composite brick, so that the heavy working layer and the light thermal insulation layer can be prevented from reacting, and a product has high fire-resistant and thermal insulation effects under the condition that the service life of a material is not shortened; and therefore, the effect of reducing energy consumption, material consumption and the using amount of a fire-resistant material of the rotary kiln is achieved, and the service life of equipment can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a magnesia three-layer composite brick and a preparation method thereof. Background technique [0002] With the continuous emergence of new technologies for cement production, the main equipment of cement production is developing in the direction of large-scale, increasing production, improving quality, saving energy, reducing consumption, and reducing costs have become the key to increasing efficiency in production management. Most of the existing refractory bricks and heat insulation bricks are made of a single material. When using them, bricks with various properties need to be used together. If they are used on relatively fixed equipment, such as tunnel kilns and downdraft kilns, they can meet the requirements. , but on some relatively moving equipment, such as a rotary kiln, it is difficult to meet the requirements when used together. Some manufactu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622F27D1/06
Inventor 王家邦
Owner 郴州市恒达环保科技有限公司
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