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Corundum refractory castable

A refractory castable, corundum-based technology, applied in the field of refractory materials, can solve the problems of unsatisfactory, low medium temperature strength, temperature reduction, etc., and achieve good thermal shock stability, improve medium temperature strength, and increase the effect of thermal shock resistance.

Active Publication Date: 2016-07-13
宁夏胜金水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the use of calcium aluminate cement and SiO2 micropowder in traditional low-cement or ultra-low-cement bonded corundum castables, the temperature at which the liquid phase appears in the material decreases, which seriously affects the high-temperature performance of the material.
The cement-free corundum castable has no new bonding phase due to the decomposition of hydrates in the binder during the medium temperature stage (800-1100°C), and the medium-temperature strength of the material is very low, which cannot meet the requirements of on-site use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] (1) Preparation of castable:

[0012] 20 parts of 2.0mm coarse aggregate, 35 parts of 1.0mm medium aggregate, 15 parts of 0.1mm fine aggregate, 5 parts of sodium silicate, 5 parts of nano-magnesium oxide, 5 parts of nano-zinc oxide, 10 parts of alumina micropowder, and 5 parts of hydrated alumina . According to the above-mentioned ratio, each raw material is weighed and then mixed with water to obtain a corundum refractory castable.

[0013] (2) Physical performance test:

[0014] After drying at 110℃×24h, the flexural strength is 110.2MPa, and the compressive strength is 22.5MPa;

[0015] After 1200℃×3H treatment, the flexural strength is 125.3MPa, and the compressive strength is 26.9MPa;

[0016] After 1600℃×3H treatment, the flexural strength is 126.6MPa and the compressive strength is 25.2MPa.

Embodiment 2

[0018] (1) Preparation of castable:

[0019] 15 parts of 2.5mm coarse aggregate, 40 parts of 1.5mm medium aggregate, 15 parts of 0.6mm fine aggregate, 1 part of sodium silicate, 6 parts of nano-magnesium oxide, 6 parts of nano-zinc oxide, 11 parts of alumina micropowder, 6 parts of hydrated alumina . According to the above ratio, weigh each raw material and add water to make corundum refractory castable.

[0020] (2) Physical performance testing:

[0021] After drying at 110℃×24h, the flexural strength is 111.2MPa, and the compressive strength is 22.3MPa;

[0022] After 1200℃×3H treatment, the flexural strength is 125.1MPa, and the compressive strength is 25.8MPa;

[0023] After 1600℃×3H treatment, the flexural strength is 125.6MPa and the compressive strength is 24.3MPa.

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Abstract

The invention relates to a corundum refractory castable which is prepared from the following components in parts by weight: 15-20 parts of coarse aggregate, 35-40 parts of medium aggregate, 15-30 parts of fine aggregate, 5-10 parts of sodium silicate, 5-10 parts of nano magnesium oxide, 1-5 parts of nano zinc oxide, 10-15 parts of alumina micro powder and 1-6 parts of hydrated alumina, wherein the coarse aggregate is corundum, the medium aggregate comprises dolomite and zirconite, and the fine aggregate is corundum.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, in particular to a corundum-based refractory castable. Background technique [0002] Compared with qualitative refractory products, unshaped refractory materials represented by refractory castables have the advantages of short process flow, low production energy consumption and cost, convenient use, wide application range, integrity and good use effect, so they are widely used in the world. It has developed rapidly, and its proportion in the whole refractory material is getting higher and higher. In some countries with advanced refractory technology, the output of unshaped refractories has approached or even exceeded the output of shaped products. For example, the current output of unshaped refractory materials in Japan accounts for about 60% of the total refractory materials; that of the United States is about 50%; and that of countries such as Britain, Germany, and France is 40% t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 穆祥王西来董伟胜
Owner 宁夏胜金水泥有限公司
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