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Preparation method of low-heat-conductivity magnesia-alumina spinel brick

A magnesia-aluminum spinel brick, low thermal conductivity technology, applied in chemical instruments and methods, manufacturing tools, ceramic molding machines, etc. The effect of loss reduction

Active Publication Date: 2016-05-11
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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  • Preparation method of low-heat-conductivity magnesia-alumina spinel brick
  • Preparation method of low-heat-conductivity magnesia-alumina spinel brick
  • Preparation method of low-heat-conductivity magnesia-alumina 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

The invention discloses a preparation method of a low-heat-conductivity magnesia-alumina spinel brick. The method is characterized in that the low-heat-conductivity magnesia-alumina spinel brick is prepared from a fire-resistant layer and a heat-insulating layer, and is made by sintering at the temperature of 1,550-1,750 DEG C. The fire-resistant layer of the low-heat-conductivity magnesia-alumina spinel brick prepared by the method is made of high-purity magnesia-alumina spinel, and has excellent high-temperature mechanical properties of erosion resistance, washout resistance, thermal shock resistance and mechanical stress resistance; the heat-insulating layer is made of magnesium-iron composite olivine, and has excellent high-temperature performance and a low heat conductivity coefficient; magnesium olivine and iron olivine are compounded, so that smooth transition of the heat conductivity coefficients of the heat-insulating layer and the fire-resistant layer is realized, high bonding strength is achieved, smooth transition from high heat conductivity to low heat conductivity is also realized, and the heat consumption is lowered.

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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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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