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High-strength high thermal-shock-resistance low-aluminium mullite brick

A technology of mullite bricks and sintered mullite, which is applied in the field of high-strength, high-thermal shock and low-alumina mullite bricks, can solve the problems of hot blast furnace settlement deformation, insufficient thermal shock stability, wall peeling and collapse, etc., and achieve excellent high temperature Performance and normal temperature performance, high thermal volume stability, effect of good volume stability

Inactive Publication Date: 2012-10-31
GONGYI HONGYU FIREPROOFING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the refractory materials used in the medium and low temperature areas of large and medium-sized blast furnace hot blast stoves are mostly clay large wall bricks and checker bricks. Due to the low strength (not greater than 50Mpa) and low thermal shock stability of clay wall bricks and checker bricks, the thermal shock stability is less than 10 times. , high-temperature creep rate index fluctuations, and high content of impurities such as ferric oxide and potassium oxide, etc., which cause the phenomenon of settlement deformation, wall peeling and collapse of the hot blast stove during the application process, resulting in a generation of furnace life. The design life of more than 25 years cannot be reached; at present, some furnaces are deformed and collapsed after three to six months of operation, and some furnaces are between two to three to five years old, and have to be shut down for emergency repairs. It caused huge economic losses and cast a shadow over safe production.

Method used

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  • High-strength high thermal-shock-resistance low-aluminium mullite brick

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The high-strength, high-thermal-shock and low-alumina mullite bricks of the present invention are represented by weight percentage. The high-strength, high-thermal shock and low-alumina mullite bricks are composed of 30% sintered mullite, 10% fused mullite, and super-grade coke gemstones. 15%, 15% sillimanite, 10% andalusite, 5% activated alumina, 3% zircon, 7% silica and 5% bonded clay.

[0027] The raw material sintered mullite used in this example is M45 type sintered mullite, in which the mass percentage of alumina is 45-48%; % and 15% of sintered mullite with a particle size of 3-0mm;

[0028] The 15% of the super burnt gem used is composed of 10% of the super burnt gem with a particle size of 3-0mm and 5% of the super burnt gem with a particle size of -200 mesh;

[0029] The particle size of the fused mullite used is 3-0 mm; the sillimanite is Linkou sillimanite; the andalusite is Xinjiang andalusite, and the particle size of Xinjiang andalusite is -200 mesh; the...

Embodiment 2

[0030] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0031] The high-strength, high-thermal-shock and low-alumina mullite bricks of the present invention are represented by weight percent. The high-strength, high-thermal shock and low-alumina mullite bricks are composed of 20% sintered mullite, 15% fused mullite, and super-grade coke gemstones. 10%, 20% sillimanite, 15% andalusite, 2% activated alumina, 5% zircon, 3% silica and 10% bonded clay.

[0032] The 20% sintered mullite used is composed of 10% sintered mullite with a particle size of 5-3mm and 10% sintered mullite with a particle size of 3-0mm;

[0033] The 10% super burnt gems used are composed of 5% super burnt gems with a particle size of 3-0mm and 5% super burnt gems with a particle size of -200 mesh.

Embodiment 3

[0034] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0035] The high-strength, high-thermal-shock, low-alumina mullite brick of the present invention is represented by weight percent. The high-strength, high-thermal shock, and low-alumina mullite brick consists of 15% sintered mullite, 5% fused mullite, and super-grade coke gemstones. 25%, sillimanite 10%, andalusite 20%, activated alumina 8%, zircon 2%, silica 12% and bonded clay 3%.

[0036] The 15% sintered mullite used is composed of 5% sintered mullite with a particle size of 5-3mm and 10% sintered mullite with a particle size of 3-0mm;

[0037] The 25% of super burnt gemstones used are composed of 15% of super grade burnt gemstones with a particle size of 3-0 mm and 10% of super grade burnt gemstones with a particle size of -200 mesh.

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Abstract

The invention relates to a high-strength high thermal-shock-resistance low-aluminium mullite brick, which comprises the following components in percentage by weight: 15-50% of raw material sintered mullite, 5-15% of electric melted mullite, 10-40% of superfine flint clay, 10-30% of sillimanite, 10-30% of andalusite, 2-10% of activated alumina, 2-15% of zirconite, 2-12% of silica and 3-10% of bond clay. The high-strength high thermal-shock-resistance low-aluminium mullite brick provided by the invention made from the above raw material components has the advantages of high refractoriness under load (larger than or equal to 1500 DEG C) and heated volume stability, high thermal-shock resistance (larger than or equal to 50 times under water cooling at 1100 DEG C), low creep rate (smaller than or equal to 0.15 in 20-50 hours), good compressive strength (larger than or equal to 70Mpa), good volume stability and low impurity content at high temperature and the like; and at the same time, the CO corrosion resistance of the product provided by the invention is unaffected, so that the product provided by the invention can meet the use requirements of the medium and large blast furnace hot blast stove and other high-temperature kilns.

Description

technical field [0001] The invention relates to an unshaped refractory material, in particular to a high-strength, high-thermal-shock low-alumina mullite brick. Background technique [0002] At present, the refractory materials used in the medium and low temperature areas of large and medium-sized blast furnace hot blast stoves are mostly clay large wall bricks and checker bricks. Due to the low strength (not greater than 50Mpa) and low thermal shock stability of clay wall bricks and checker bricks, the thermal shock stability is less than 10 times. , high-temperature creep rate index fluctuations, and high content of impurities such as ferric oxide and potassium oxide, etc., which cause the phenomenon of settlement deformation, wall peeling and collapse of the hot blast stove during the application process, resulting in a generation of furnace life. The design life of more than 25 years cannot be reached; at present, some furnaces are deformed and collapsed after three to s...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/185
Inventor 郭长江杨奇张伟杨玉聪连曾伟
Owner GONGYI HONGYU FIREPROOFING CO LTD
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