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Corundum castable refractory

A refractory castable and corundum technology, which is applied in the field of refractory materials, can solve the problems of unsatisfactory, low medium temperature strength, affecting the high temperature performance of materials, etc., and achieves good thermal shock stability and improves the effect of medium temperature strength.

Inactive Publication Date: 2014-01-29
NINGXIA TIANZONG HONGGUANG COGENERATION TECH
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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.
However, due to the decomposition of hydrates in the binder in the middle temperature stage (800-1100°C) of cement-free corundum castables, there is no new binding phase, 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 2.5mm coarse aggregate, 35 parts of 1.5mm medium aggregate, 15 parts of 0.5mm 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, the raw materials are weighed and blended together to obtain the corundum refractory castable.

[0013] (2) Physical performance test:

[0014] After drying at 110℃×24h, the flexural strength is 100.2MPa, and the compressive strength is 23.6MPa;

[0015] After 1100℃×3H treatment, the flexural strength is 120.4MPa, and the compressive strength is 25.5MPa;

[0016] After 1500℃×3H treatment, the flexural strength is 125.3MPa, and the compressive strength is 24.3MPa.

Embodiment 2

[0018] (1) Preparation of castable:

[0019] 15 parts of 2.0mm coarse aggregate, 40 parts of 1.0mm medium aggregate, 15 parts of 0.1mm 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-mentioned ratio, the raw materials are weighed and blended together to obtain the corundum refractory castable.

[0020] (2) Physical performance testing:

[0021] After drying at 110℃×24h, the flexural strength is 99.2MPa, and the compressive strength is 22.1MPa;

[0022] After 1100℃×3H treatment, the flexural strength is 115.1MPa, and the compressive strength is 24.2MPa;

[0023] After 1500℃×3H treatment, the flexural strength is 120.1MPa, and the compressive strength is 23.6MPa.

Embodiment 3

[0025] (1) Preparation of castable:

[0026] 18 parts of 2.3mm coarse aggregate, 38 parts of 1.2mm medium aggregate, 13 parts of 0.3mm fine aggregate, 4 parts of sodium silicate, 8 parts of nano-magnesium oxide, 4 parts of nano-zinc oxide, 13 parts of alumina micropowder, 2 parts of hydrated alumina . According to the above-mentioned ratio, the raw materials are weighed and blended together to obtain the corundum refractory castable.

[0027] (2) Physical performance testing:

[0028] After drying at 110℃×24h, the flexural strength is 101.5MPa, and the compressive strength is 23.9MPa;

[0029] After 1100℃×3H treatment, the flexural strength is 122.4MPa, and the compressive strength is 26.6MPa;

[0030] After 1500℃×3H treatment, the flexural strength is 126.3MPa, and the compressive strength is 25.1MPa.

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Abstract

The invention discloses a corundum castable refractory, comprising coarse aggregate, intermediate aggregate, fine aggregate, sodium silicate, nanometer magnesium oxide, nanometer zinc oxide, alumina micro powder and hydrated alumina, wherein the corundum castable refractory comprises the following raw materials in parts by weight: 15-20 parts of coarse aggregate, 35-40 parts of intermediate aggregate, 15-30 parts of fine aggregate, 5-10 parts of sodium silicate, 5-10 parts of nanometer magnesium oxide, 1-5 parts of nanometer zinc oxide, 10-15 parts of alumina micro powder and 1-6 parts of hydrated alumina; the coarse aggregate is corundum, the intermediate aggregate comprises silicon carbide and zircon corundum, 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 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; in the United States, it is about 50%; in Britain, Germany, France and other countries, it is 40% to 50%. Today,...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 穆祥王西来董伟胜刘文艳解仁刘朝晖苏新国王淑娟
Owner NINGXIA TIANZONG HONGGUANG COGENERATION TECH
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