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Andalusite self-flow castable

An andalusite and castable technology, which is applied to the field of coal injection pipe castables in dry process cement production lines, can solve the problems of shortened coal injection pipe life, poor thermal shock stability, large thermal expansion coefficient, etc., and achieves good high temperature volume stability. properties, avoid castable segregation, and reduce the effect of alkaline corrosion

Inactive Publication Date: 2012-06-20
ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal expansion coefficient of corundum is relatively large, and the thermal shock stability is not good. In addition, the corundum changes from α-phase corundum to β-phase corundum in the alkaline atmosphere of the cement kiln, causing volume expansion and easily causing structural damage, which greatly shortens the life of the coal injection pipe. shorten

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1, the andalusite self-flowing castable includes andalusite, fused mullite, silicon carbide, mullite hollow spheres, pure calcium aluminate cement, alumina micropowder, zirconium silicate, melamine, polycarboxylate FOX-8H . 2. The castable also includes nano-calcium carbonate, sodium hexametaphosphate and explosion-proof fibers. Among them, andalusite, fused mullite, silicon carbide, mullite hollow spheres, pure calcium aluminate cement, alumina micropowder, nano-calcium carbonate, and zirconium silicate are the main raw materials in the castable, and each group of main raw materials The weight percentage of the total weight of the main raw materials is 50-60% of andalusite, 10-25% of fused mullite, 1-15% of silicon carbide, 1-5% of mullite hollow spheres, and 3% of pure calcium aluminate cement -8%, alumina micropowder 3-8%, nano calcium carbonate 0-1%, zirconium silicate 1-3%. The melamine, polycarboxylate FOX-8H, sodium hexametaphosphate, and explosion-proo...

Embodiment 2

[0016] Example 2, the difference from Implementation 1 is that the weight percentages of each component of the main raw material to the total weight of the main raw material are 50% of andalusite, 10% of fused mullite, 15% of silicon carbide, and hollow mullite Ball 5%, pure calcium aluminate cement 8%, alumina micropowder 8%, nano calcium carbonate 1%, zirconium silicate 3%.

Embodiment 3

[0017] Example 3, the difference from Implementation 1 is that the weight percentages of each component of the main raw material to the total weight of the main raw material are 57% of andalusite, 20% of fused mullite, 4% of silicon carbide, and hollow mullite Ball 3%, pure calcium aluminate cement 5%, alumina micropowder 6%, nano calcium carbonate 1%, zirconium silicate 2%.

[0018] This product is made of high-quality andalusite, silicon carbide and various admixtures and other raw materials, and is adjusted after many experiments and feedback from the manufacturer. By adjusting particle gradation, adding various water reducing agents and micropowder technology, the traditional vibration construction method is changed, and the self-flow mode is adopted, which can automatically flow, level, compact and solidify without vibration of the vibrating rod, avoiding the possibility of vibration construction. It is especially suitable for special-shaped parts that are not easy to vib...

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PUM

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Abstract

The invention discloses an andalusite self-flow castable, comprising andalusite, fused mullite, silicon carbide, mullite hollow balls, pure calcium aluminate cement, aluminum oxide micro-powder, zirconium silicate, tripolycyanamide, and polycarboxylic acid FOX-8H. The castable further comprises nano calcium carbonate, sodium hexametaphosphate and anti-explosion fiber. According to the andalusite self-flow castable disclosed by the invention, raw materials, such as the high-quality andalusite, silicon carbide, various additives and the like are selected. The andalusite self-flow castable is formed by regulating according to repeated tests and feedback after being used by a manufacturer. As the andalusite is transformed to be the mullite at a high temperature, and the vast majority of residual SiO2 in the andalusite is located in mullite crystals. Under a high temperature state, the SiO2 softened in the mullite crystals can absorb the volume variation of the mullite, which is caused by the temperature variation, so that the structure of the mullite formed by the andalusite has better high-temperature volume stability and thermal shock stability.

Description

technical field [0001] The invention relates to a castable for coal injection pipes on a dry process cement production line. Background technique [0002] The service life of the coal injection pipe on the new dry process cement production line directly determines the operating rate of the entire kiln system. The current coal injection pipe is generally made of corundum mullite castable. The thermal expansion coefficient of corundum is relatively large, and the thermal shock stability is not good. In addition, the corundum changes from α-phase corundum to β-phase corundum in the alkaline atmosphere of the cement kiln, causing volume expansion and easily causing structural damage, which greatly shortens the life of the coal injection pipe. shorten. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an andalusite self-flowing castable with high strength and long service life. [0004] In order to solve the above-me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 朱国平刘家祥朱锦和朱其良山国强
Owner ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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