A kind of preparation method of low thermal conductivity magnesia-aluminum spinel brick

A magnesia-alumina spinel brick, low thermal conductivity technology, applied in chemical instruments and methods, manufacturing tools, ceramic layered products, etc. Effects of stress and thermal conductivity reduction

Active Publication Date: 2019-04-23
ZIBO CITY LUZHONG REFRACTORIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention overcomes the disadvantage of high thermal conductivity of magnesia-alumina-spinel bricks used in rotary kilns, and provides a magnesia-alumina-spinel structural heat insulation unit with good wear resistance, high refractoriness, high structural strength and excellent thermal insulation performance composite brick

Method used

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  • A kind of preparation method of low thermal conductivity magnesia-aluminum spinel brick
  • A kind of preparation method of low thermal conductivity magnesia-aluminum spinel brick
  • A kind of preparation method of low thermal conductivity magnesia-aluminum spinel brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In this example, electric fusion and high-purity composite raw materials are used to produce low thermal conductivity magnesium-aluminum spinel bricks for the transition zone of cement kilns. Wherein the formula of each layer material is:

[0045] Refractory layer: sintered magnesia with a particle size of 5-0mm accounts for 45% of the total, and magnesium-aluminum spinel with a particle size of 4-0mm accounts for 10% of the total. Fused magnesia with a particle size of 3-0mm accounts for 40% of the total. The corundum particle size is 2-0mm, accounting for 5% of the total.

[0046] The specific ratio is as follows:

[0047] 5-0mm sintered magnesia 45%

[0048] 4-0mm magnesium aluminum spinel 10%

[0049] 3-0mm fused magnesia 40%

[0050] 2-0mm Corundum 5%

[0051] The above-mentioned raw materials are weighed, mixed, and kneaded with a Na-based binder to make low thermal conductivity magnesium-aluminum spinel brick refractory layer raw materials.

[0052] Insula...

Embodiment 2

[0060] In this example, electric fusion and high-purity composite raw materials are used to produce low thermal conductivity magnesium-aluminum spinel bricks for the transition zone of cement kilns. Wherein the formula of each layer material is:

[0061] Refractory layer: sintered magnesia with a particle size of 5-0mm accounts for 60% of the total, and magnesium-aluminum spinel with a particle size of 4-0mm accounts for 10% of the total. Fused magnesia with a particle size of 3-0mm accounts for 25% of the total. The corundum particle size is 2-0mm, accounting for 5% of the total.

[0062] The specific ratio is as follows:

[0063] 5-0mm sintered magnesia 60%

[0064] 4-0mm magnesium aluminum spinel 10%

[0065] 3-0mm fused magnesia 25%

[0066] 2-0mm Corundum 5%

[0067] The above-mentioned raw materials are weighed, mixed, and kneaded with a Na-based binder to make low thermal conductivity magnesium-aluminum spinel brick refractory layer raw materials.

[0068] Insula...

Embodiment 3

[0076] In this example, electric fusion and high-purity composite raw materials are used to produce low thermal conductivity magnesium-aluminum spinel bricks for the transition zone of cement kilns. Wherein the formula of each layer material is:

[0077] Refractory layer: sintered magnesia with a particle size of 5-0mm accounts for 68% of the total, and magnesium-aluminum spinel with a particle size of 4-0mm accounts for 10% of the total. Fused magnesia with a particle size of 3-0mm accounts for 19% of the total. The corundum particle size is 2-0mm, accounting for 3% of the total.

[0078] The specific ratio is as follows:

[0079] 5-0mm sintered magnesia 68%

[0080] 4-0mm magnesium aluminum spinel 10%

[0081] 3-0mm fused magnesia 19%

[0082] 2-0mm Corundum 3%

[0083] The above-mentioned raw materials are weighed, mixed, and kneaded with a Na-based binder to make low thermal conductivity magnesium-aluminum spinel brick refractory layer raw materials.

[0084] Insula...

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Abstract

A method for preparing a low thermal conductivity magnesia aluminum spinel brick, characterized in that the low thermal conductivity magnesia aluminum spinel brick is composed of a refractory layer and a heat insulation layer and is fired at 1550-1750°C. The refractory layer of the low thermal conductivity magnesia-aluminum spinel brick prepared by the invention is high-purity magnesia-alumina spinel, which has good high-temperature mechanical properties of corrosion resistance, erosion resistance, thermal shock resistance and mechanical stress resistance, and the heat insulation layer is magnesium-iron composite Olivine not only has excellent high-temperature performance, but also has low thermal conductivity. Due to the compounding of forsterite and fayalite, the thermal expansion coefficient of the heat-insulating layer and the refractory layer has achieved a smooth transition, and the bonding strength is high. The thermal conductivity transitions smoothly to low thermal conductivity, reducing heat consumption.

Description

technical field [0001] The invention relates to a refractory material for a rotary kiln, belonging to the technical field of refractory material preparation. The material is composed of high-purity magnesium-aluminum spinel material refractory layer and magnesium-iron composite olivine material insulation layer. It has excellent high-temperature erosion resistance, corrosion resistance, and low thermal conductivity. It is suitable for cement rotary kilns, lime Rotary kiln and various high-temperature kilns to obtain the effect of long service life, energy saving and consumption reduction. Background technique [0002] Rotary kiln is one of the main equipment in the production process of cement and lime. [0003] Take cement production as an example: [0004] There were two major technological breakthroughs in the cement industry in the 20th century. The first was the comprehensive promotion of the rotary kiln at the beginning of the century, and the second was the emergenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/443C04B35/20C04B35/66C04B35/622
CPCC04B35/20C04B35/443C04B35/622C04B35/66C04B2235/9607C04B2235/96C04B2235/3427C04B2235/3272C04B2235/77B32B18/00C04B35/043C04B35/0435C04B35/05C04B35/62655C04B35/63404C04B2235/5427C04B2235/602C04B2237/345C04B37/008C04B2237/341C04B2237/343B28B3/00
Inventor 陈俊红封吉圣贾元平吴艳霞朱波郭玉涛
Owner ZIBO CITY LUZHONG REFRACTORIES CO LTD
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