High-strength mullite pouring material for cement kiln

A mullite and cement kiln technology, applied in the field of mullite castables, can solve the problems of low compressive strength and flexural strength, unable to meet long-term use, poor thermal stability, etc., to achieve enhanced fluidity, Excellent thermal shock resistance and strong wear resistance

Active Publication Date: 2013-09-11
JIANGSU HENGNAI FURNACE CHARGE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the high-temperature strength of cement kiln castables using mullite as raw material is relatively low, and the thermal stability is not good. Low, the linear change rate at 1100°C is between -0.5% and -0.3%, poor thermal shock resistance, wear resistance at room temperature ≥ 4.8cc (after burning at 1100°C), and a large amount of water is added during use, usually 6%~ 7%, generally unable to meet the long-term use of cement kiln mouth, coal injection pipe and other parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A high-strength and wear-resistant high-strength mullite castable for cement kilns, its components and mass percentages are as follows: the mass percentage of mullite with a particle size of 5-3mm is 31%, and the mass percentage of mullite with a particle size of 3-1mm The mass percentage of mullite is 18%, the mass percentage of mullite with a particle size of 1-0mm is 19%, SiO 2 The mass percentage of fine powder is 5%, the mass percentage of SiC powder is 4%, the mass percentage of white corundum powder is 9%, α-Al 2 o 3 The mass percent of micro powder is 8%, and the mass percent of pure calcium aluminate cement is 6%. In addition, when in use, adding 0.18% by mass of sodium tripolyphosphate improves the fluidity of the castable. The maximum service temperature of this castable is 1700°C, and the bulk density is 2.8-3.0g / cm 3 , compressive strength at 110°C ≥ 100MPa, compressive strength at 1100°C ≥100MPa, flexural strength at 1500°C ≥12MPa, linear change rate ≤ ...

Embodiment 2

[0018] A high-strength and wear-resistant high-strength mullite castable for cement kilns, the components and their mass percentages are: the mass percentage of mullite with a particle size of 8-5mm is 5%, and the The mass percentage of mullite is 21%, the mass percentage of mullite with a particle size of 3-1mm is 24%, the mass percentage of mullite with a particle size of 1-0mm is 19%, SiO 2 The mass percentage of fine powder is 5.5%, the mass percentage of SiC powder is 5%, the mass percentage of white corundum powder is 10%, α-Al 2 o 3 The mass percentage of the fine powder is 4.5%, and the mass percentage of the pure calcium aluminate cement is 6%. In addition, when in use, adding sodium hexametaphosphate with a mass percentage of 0.16% improves the fluidity of the castable. The maximum service temperature of this castable is 1650°C, and the bulk density is 2.7-2.9g / cm 3 , compressive strength at 110°C ≥ 110MPa, compressive strength at 1100°C ≥100MPa, flexural strength...

Embodiment 3

[0020] A high-strength and wear-resistant high-strength mullite castable for cement kilns, its components and mass percentages are as follows: the mass percentage of mullite with a particle size of 5-3mm is 31%, and the mass percentage of mullite with a particle size of 3-1mm The mass percentage of mullite is 19%, the mass percentage of mullite with a particle size of 1-0mm is 14%, the mass percentage of andalusite with a particle size of 1-0mmm is 5%, SiO 2 The mass percentage of fine powder is 5%, the mass percentage of SiC powder is 5%, the mass percentage of white corundum powder is 9%, α-Al 2 o 3 The mass percent of the fine powder is 6%, and the mass percent of the pure calcium aluminate cement is 6%. In addition, when in use, adding 0.18% by mass of sodium tripolyphosphate improves the fluidity of the castable. The maximum service temperature of this castable is 1700°C, and the bulk density is 2.75-2.95g / cm 3 , compressive strength at 110°C ≥ 100MPa, compressive stre...

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Abstract

The invention discloses a high-strength mullite pouring material for a cement kiln, which comprises the following components: a mullite with a particle size of 8-5 mm, a mullite with a particle size of 5-3 mm, a mullite with a particle size of 3-1 mm, a mullite with a particle size of 1-0 mm, SiO2 micro powder, SiC powder, white fused alumina powder, alpha-Al2O3 micro powder, pure calcium aluminate cement and andalusite. The high-strength mullite pouring material for the cement kiln has the advantages of high temperature resistance, high compression strength, high rupture strength, good abrasion performance and less amount of added water during the use. The high-strength mullite pouring material for the cement kiln can satisfy the long-time use of a cement kiln mouth, a coal injection pipe and other parts.

Description

technical field [0001] The invention relates to an unshaped refractory material, in particular to a mullite pouring material used in a cement kiln. Background technique [0002] At present, the high-temperature strength of cement kiln castables using mullite as raw material is relatively low, and the thermal stability is not good. Low, the linear change rate at 1100°C is between -0.5% and -0.3%, poor thermal shock resistance, wear resistance at room temperature ≥ 4.8cc (after burning at 1100°C), and a large amount of water is added during use, usually 6%~ 7%, generally unable to meet the long-term use of cement kiln mouth, coal injection pipe and other parts. Contents of the invention [0003] The purpose of the present invention is to provide a mullite castable with good thermal stability, strong wear resistance and good fluidity for the deficiencies in the high temperature strength and thermal stability of the existing mullite castables described in the background techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/185
Inventor 韩亚伟
Owner JIANGSU HENGNAI FURNACE CHARGE GRP
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