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Low cement high temperature high trength pouring material

A castable and cement technology, applied in the field of low-cement high-temperature and high-strength castables, can solve the problems of affecting the service life of equipment, short service life, poor burst resistance, etc., and achieve significant economic and social benefits, good thermal shock stability, Strong anti-erosion effect

Inactive Publication Date: 2005-03-23
王永发
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-cement refractory castables commonly used in the known technology are traditionally made of alumina cement, aggregate, fine powder, water, and an expansion agent. It was eliminated by the metallurgical industry because of its low strength and short service life
In the high-temperature section of the heating furnace of the steel rolling mill and the forging plant that uses coal as fuel, it needs to be overhauled every three months, even if it is used such as adding SiO 2 、AL 2 o 3 , MgO and other ultra-fine powder low-cement, ultra-low-cement or even cement-free castables, the service life of the equipment can only be doubled, and the service life is about six months, which is difficult to meet the needs of continuous operations in large-scale production. Therefore, the large-scale production of steel rolling and forging industry is restricted
The reason for this situation is that the fuel commonly used in the steel rolling and forging industry is coal, and coal produces a large number of different chemical components during the combustion process due to different origins, and the roof of the furnace is greatly eroded by the blowing of the high-pressure fan, so the heating furnace The high temperature section has serious high temperature corrosion, which affects the service life of the equipment
After searching the Chinese patent 93120484.4, the cement-free self-flowing bauxite composite castable and 93121050.X cement-free self-flowing corundum composite castable are disclosed. These two patented technologies add ultra-fine powder to the castable, which improves the yield of the castable. Density and strength, but because the addition of ultra-fine powder reduces the gap in the castable, the water in the castable is not easy to discharge, and bursting occurs when heated, which brings the hazard of poor bursting resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The low-cement, high-temperature, high-strength castable of the present invention was tested in Anshan Dagushan Minzheng Forging Plant, and the materials were selected:

[0024] Alumina aggregate: AL 2 o 3 Content 80-85%, particle size: 20 parts of 1-3mm, 10 parts of 3-5mm, 20 parts of 5-8mm, 10 parts of 8-12mm;

[0025] Alumina fine powder: AL 2 o 3 Content 80-85%, fineness 200 mesh, 29 parts;

[0026] Pure calcium aluminate cement: 80# AL 2 o 3 6 copies;

[0027] Silica fume: SiO 2 >93, 5 servings;

[0028] Water reducing agent: sodium hexametaphosphate weight component: 0.03 parts;

[0029] Anti-explosion agent: fine fiber weight component: 0.005 part;

[0030] Water: 6 parts.

[0031] It is used for experimental research under the operation of 5 tons of air hammer, the vibration wave is below the third level, the furnace temperature is 1350-1400 ℃, coal is fired, the forging weighs 3-4 tons, and the furnace life can reach 24 months.

Embodiment 2

[0033] The low-cement, high-temperature, high-strength castable of the present invention was tested in Anshan Sanhe Steel Rolling Plant. It was applied to cast the high-temperature section wall, and the overall mold was made in the high-temperature section of the heating furnace. It was poured after stirring for 5 to 15 minutes with a forced mixer. When pouring half of the workload Use a vibrating rod to vibrate and reshape, remove the mold after 24 hours, and bake with a low fire. Main indicator: AL 2 o 3 >65%, refractoriness >1760°C, high-temperature compressive strength >50MPa, high-strength flexural strength >50MPa, bulk density >2.6, linear change rate -1. After 24 months of production test and research, only 20% of the wall surface is damaged, and it is still in normal use.

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Abstract

A high-temp and-strength pouring material with low content of cement for high-temp furnace bauxite as aggregate, alumina powder, calcium aluminate cement, silicon ash, sodium hexametaphosphate, fine fibres and water. Its service life is about 24-month at three-level oscillation wave station.

Description

technical field [0001] The invention relates to an unshaped refractory material, in particular to a low-cement high-temperature high-strength castable used in the special environment of a high-temperature furnace in the metallurgical industry. Background technique [0002] At present, the application of unshaped refractory castables in coal-fired heating furnaces in the metallurgical industry has enabled coal-fired heating furnaces to meet the needs of large-scale production. The performance of unshaped refractory castables has an important impact on improving production efficiency and energy saving in the metallurgical industry . The high-cement refractory castables commonly used in the known technology are traditionally made of alumina cement, aggregate, fine powder, water, and an expansion agent. Because of its low strength and short service life, it was eliminated by the metallurgical industry. In the high-temperature section of the heating furnace of the steel rolling...

Claims

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Application Information

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IPC IPC(8): C04B14/04C04B14/30C04B22/16C04B28/06C04B35/66
Inventor 王永发
Owner 王永发
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