Pouring material for cement kiln tertiary air duct

A castable and cement kiln technology, applied in the field of refractory materials, can solve problems such as relatively strict construction period requirements, difficulty in meeting market demand, and poor thermal shock resistance

Active Publication Date: 2016-02-03
长兴兴鹰新型耐火建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the tertiary air duct of the cement kiln, an elbow is needed to change the direction of the pipeline. The inner wall of the elbow is a smooth surface. The temperature of the tertiary air duct of the cement kiln varies greatly, the wind speed in the pipe is high, and the hot air flow contains a large number of fine clinker particles. The tertiary air duct is directly scoured and eroded by the dust-laden hot air flow for a long time, which makes the wear-resistant castable material fall off. At present, there are wear-resistant castable materials on the market, such as the silicon carbide mullite wear-resistant castable material disclosed in patent number CN103819204B , when used in this part, there are generally defects such as low wear resistance, poor high temperature res...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A castable for the tertiary air duct of a cement kiln, including aggregate and base material, the weight ratio of the aggregate and the base material is 2:3; the aggregate includes 28 parts by weight of fused magnesia, 45 parts by weight parts of chromium-modified chromium corundum, 5 parts of zirconite and 20 parts of magnesium-aluminum spinel; the particle size range is 1-10 mm, and the average particle size is 4-6 mm. The base material includes magnesia fine powder, silicon oxide fine powder, mullite fine powder, alumina fine powder and andalusite, the particle size ranges from 0.1 to 0.5mm, and the average particle size is 0.3mm. Among them, in the aggregate, the content of magnesium oxide in fused magnesia reaches 95.5%, and the particle size range of fused magnesia is distributed in the range of 1-10mm. The specific composition is: 21% of fused magnesia of 6-10mm, 36 % of 3 ~ 6mm fused magnesia, 43% of 1 ~ 3mm fused magnesia. The composition of the particle size ...

Embodiment 2

[0020] A castable for the tertiary air duct of a cement kiln, including aggregate, base material and fiber additive, the weight ratio of the aggregate and the base material is 8:2; the aggregate includes 50 parts by weight of fused magnesium Sand, 30 parts by weight of zirconium-modified zirconium corundum, 15 parts by weight of zirconite and 15 parts by weight of magnesium-aluminum spinel; the particle size is between 1 and 10 mm. The base material includes magnesia fine powder, silica fine powder, mullite fine powder, alumina fine powder, andalusite and zircon, and the particle size range of the base material is between 0.1 and 0.5 mm; 10% of the total amount of the base material, the content of zirconium dioxide and silicon dioxide in zircon reaches 67%. Among them, the content of magnesium oxide in the fused magnesia in the aggregate reaches 97%, and the particle size range of the fused magnesia is 1-10mm. 3-6mm fused magnesia, 50% 1-3mm fused magnesia. The composition o...

Embodiment 3

[0022] A castable for the tertiary air duct of a cement kiln, including aggregate, base material and fiber additives, the weight ratio of the aggregate to the base material is 6:1; the particle size of the aggregate is 1~ 10mm, the particle size of the base material is 0.1-0.5mm; the aggregate includes 48 parts by weight of fused magnesia, 25 parts by weight of zirconium modified zirconium corundum, 12 parts by weight of zirconite and 8 parts by weight parts of magnesia-alumina spinel; the base material includes magnesia fine powder, silica fine powder, mullite fine powder and alumina fine powder, andalusite and zircon, and the addition of zircon is the base material The content of zirconium dioxide and silicon dioxide in zircon reaches 72%. Among them, the content of magnesium oxide in fused magnesia reaches 96%, and the particle size range of fused magnesia is 1-10mm. Specifically, fused magnesia includes 5% of 6-10mm fused magnesia, 68% of fused magnesia 3-6mm fused magnes...

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Abstract

The invention relates to a pouring material for a cement kiln tertiary air duct. The pouring material comprises aggregate and a matrix material according to a weight ratio of 2-8: 1-3. The aggregate has particle sizes of 1-10mm and the matrix material has the particle sizes of 0.1-0.5mm. The aggregate comprises, by weight, 28-50 parts of fused magnesia, 25-45 parts of modified white alundum, 5-15 parts of zirconium mullite and 8-20 parts of magnesium aluminate spinel. The matrix material comprises magnesia powder, silicon oxide fine powder, mullite powder, alumina fine powder and andalusite. The pouring material utilizes appropriate aggregate and the matrix material and has wear resistance and corrosion resistance, a uniform degree of expansion and good thermal shock stability. Through use of a fiber additive, pouring material integrality is improved, and pouring material flexural performances and anti-erosion performances are improved. The cement kiln tertiary air duct has the advantages of long service life, long replacement period, small production cost and high production efficiency under bad conditions.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a castable for a tertiary air duct of a cement kiln. Background technique [0002] In the tertiary air duct of the cement kiln, an elbow is needed to change the direction of the pipeline. The inner wall of the elbow is a smooth surface. The temperature of the tertiary air duct of the cement kiln varies greatly, the wind speed in the pipe is high, and the hot air flow contains a large number of fine clinker particles. The tertiary air duct is directly scoured and eroded by the dust-laden hot air flow for a long time, which makes the wear-resistant castable material fall off. At present, there are wear-resistant castable materials on the market, such as the silicon carbide mullite wear-resistant castable material disclosed in patent number CN103819204B , When used in this part, there are generally defects such as low wear resistance, poor high temperature resistance and poor the...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 王强许高山国强
Owner 长兴兴鹰新型耐火建材有限公司
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