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Sintered alumina-silica refractory material and preparation method thereof

A refractory material, aluminum-silicon technology, applied in the field of sintered aluminum-silicon refractory materials and its preparation, can solve the problems of high thermal conductivity of anti-flaking bricks, poor alkali resistance, and poor high temperature resistance of alkali-resistant bricks, so as to facilitate sintering and improve effect of density

Active Publication Date: 2012-10-03
ANHUI RUITAI NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, silica-molybdenum bricks are expensive, have high thermal conductivity, poor volume stability at high temperatures, and consume scarce super-grade alumina; anti-stripping bricks have high thermal conductivity and poor alkali resistance, which consume not only scarce super-grade alumina, but also scarce zircon
Alkali-resistant bricks have poor high temperature resistance

Method used

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  • Sintered alumina-silica refractory material and preparation method thereof
  • Sintered alumina-silica refractory material and preparation method thereof
  • Sintered alumina-silica refractory material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072]The raw materials are alumina-based mullite with 70% alumina content, silicon carbide, alumina micropowder, silica fume, 5% PVA aqueous solution as binder, tartaric acid and third-generation concrete water reducer as dispersant. The weight percentage formula is: 3-1mm alumina-based mullite 40%, 1-0mm alumina-based mullite 10%, 1-0mm SiC 11%, 3 , The apparent porosity is 17%, the compressive strength is 80MPa, the load softening temperature is 1650℃, the thermal shock stability is 20 times, and the alkali resistance is grade 2.

Embodiment 2

[0074] The raw materials are first grade high bauxite with 75% alumina content, silicon carbide, 800-mesh super bauxite micropowder with 85% alumina content, soft mud with 30% alumina content, and sulfurous acid pulp waste liquid as binder. The weight percentage formula is: 3-1mm first grade high bauxite 35%, 1-0mm first grade high bauxite 10%, 1-0mm SiC 15%, 3 , The apparent porosity is 18%, the compressive strength is 70MPa, the load softening temperature is 1530℃, the thermal shock stability is 25 times, and the alkali resistance is grade 1.

Embodiment 3

[0076] The raw materials are secondary high bauxite with 65% alumina content, silicon carbide, 800-mesh super bauxite micropowder with 85% alumina content, soft mud with 30% alumina content, and sulfurous acid pulp waste liquid as binder. The weight percentage formula is: 3-1mm secondary high-bauxite 35%, 1-0mm secondary high-bauxite 10%, 1-0mm SiC 15%, 3 , The apparent porosity is 18%, the compressive strength is 60MPa, the load softening temperature is 1400℃, the thermal shock stability is 25 times, and the alkali resistance is grade 1.

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Abstract

The invention relates to a sintered alumina-silica refractory material. The alumina-silica refractory material comprises aggregate, powder and additive; the aggregate comprises mullite or / and alumina and silicon carbide; the powder comprises mud or / and siliceous dust; and the additive comprises an organic bonding agent. The invention also provides a preparation method for the refractory material. The content of alumina in the refractory material is 30 to 60 percent; and the refractory material is low in price, high in high temperature resistance, erosion resistance, thermal shock resistance and wear resistance, and low in heat-conducting property and used for the cold ends of a decomposition band and a transition band of a rotary cement kiln, and can replace the conventional anti-stripping high-alumina brick and the conventional anti-stripping silicon mullite brick; and the requirements of the cement kiln on low heat conduction and alkali eclipse resistance of the refractory material can be met, the radiation loss can be reduced, and the service life of the kiln is prolonged, and the economic benefit of the kiln is improved.

Description

technical field [0001] The invention relates to a sintered aluminum-silicon refractory material and a preparation method thereof. Background technique [0002] my country is the world's largest cement producer. In 2011, China's cement production reached 2 billion tons, accounting for about 60% of the world's cement production, and the new dry process cement production technology has been widely promoted. Therefore, China's cement industry generally reflects the average level of world cement manufacturing. At present, the cold end of the transition zone of the cement rotary kiln in my country is mainly made of silica molybdenum bricks, the decomposition zone is mainly made of anti-stripping high-alumina bricks, and the kiln tail preheater is mainly made of alkali-resistant bricks. [0003] Silica bricks are made of high-quality special-grade high-alumina bauxite and silicon carbide as the main raw materials, and are often mixed with special refractory materials such as coru...

Claims

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Application Information

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IPC IPC(8): C04B35/66F27B7/20
Inventor 张金龙王杰曾汪雷李存弼周键董舜杰
Owner ANHUI RUITAI NEW MATERIALS TECH
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