Special type composite low alumina mullite brick and preparation method thereof

Abstract

The invention discloses a special type composite low alumina mullite brick which is prepared by raw materials by weight percent: 10-30% of mullite with granularity of 3-1mm, 20-40% of flint clay with granularity of 3-1mm, 10-20% of flint clay with granularity of 1-0mm, 5-15% of flint clay with granularity of -200 meshes, 10-30% of sillimanite or andalusite, and 15-25% of additive. The materials weighed according to the mixture ratio are mixed and ground, processed by ageing, extruded to be molded, dried and finally sintered, so that the special type composite low alumina mullite brick can be obtained. The special type composite low alumina mullite brick has the advantages of low apparent porosity and impurity, high strength and refractoriness under load, micro-expanded product, high mullite phase and the like, and has the function of one brick for multiple purposes. The application of the special type composite low alumina mullite brick can save a great deal of maintenance costs and energy conservation cost for steel users, thus having remarkable social and economic benefits.

Description

1. Technical field:

[0001] The invention relates to a refractory material, in particular to a special composite low-aluminum mullite brick and a preparation method thereof. 2. Background technology:

[0002] With the large-scale, high wind temperature and high-intensity smelting of modern blast furnaces, the working conditions of blast furnaces are becoming more and more harsh, especially the upper part of blast furnaces has increasingly become a key area that restricts its long life and operating benefits. Through the unremitting efforts of many technicians and workers to research and explore, we have a better understanding of the reasons for the erosion of the blast furnace body. There are three main reasons: one is the wear and tear of the brick lining by the material and the erosion of the gas flow; the other The second is the chemical erosion of the brick lining by alkali metal and zinc vapor; the third is the destructive effect of thermal stress.

[0003] As an import...

Examples

Embodiment 1

[0028] Example 1: A special composite low-alumina mullite brick and its preparation method

[0029] Represented by weight percentage, the raw material ratio of the special composite low-aluminum mullite brick of the present invention is: 10% of 70 mullite with a particle size of 3-1mm, 40% of Shandong coke gemstone with a particle size of 3-1mm, and a particle size of 10% Shandong coke gemstones with a particle size of 1-0mm, 15% Shandong coke gemstones with a particle size of -200 mesh, 10% Jixi sillimanite (200 mesh particle size) and 15% zirconium powder (300 mesh particle size).

[0030] The preparation method of the product special compound low alumina mullite brick of the present invention:

[0031] According to the raw material ratio of the above-mentioned special composite low-aluminum mullite bricks, the prepared materials are poured into the wheel mill for mixing and grinding. The mixing time is 10 to 20 minutes. After the mixing and grinding, the mixed materials are...

Embodiment 2

[0032] Embodiment two: basically the same as embodiment one, the difference is:

[0033] Represented by weight percent, the raw material ratio of the special composite low-aluminum mullite brick of the present invention is: 20% of 60 mullite with a particle size of 3 to 1mm, 20% of Pingdingshan coke gemstones with a particle size of 3 to 1mm, and a particle size of 1-0mm Pingdingshan coke gemstones 20%, Pingdingshan coke gemstones with a particle size of -200 mesh 5%, Linkou sillimanite (particle size 240 mesh) 15% and zirconium powder (particle size 180 mesh) 20%.

[0034] The preparation method of the special composite low-aluminum mullite brick of the present invention differs from the first embodiment in that: the mixing and grinding time is 15 minutes, the material trapping time is 12 hours, and when the roasting temperature reaches 1420° C., it is kept for 13 hours.

Embodiment 3

[0035] Embodiment three: basically the same as embodiment one, the difference is:

[0036] Represented by weight percentage, the raw material ratio of the special composite low-aluminum mullite brick of the present invention is: 30% of 45 mullite with a particle size of 3 to 1mm, 20% of Pingdingshan coke gemstones with a particle size of 3 to 1mm, and a particle size of 10% Pingdingshan coke gems with a particle size of 1-0mm, 5% Pingdingshan coke gems with a particle size of -200 mesh, 10% Linkou sillimanite (280 mesh particle size) and 25% zirconium powder (240 mesh particle size).

[0037] The preparation method of the special composite low-alumina mullite brick of the present invention differs from the first example in that: the mixing and grinding time is 10 minutes, the material trapping time is 15 hours, and when the roasting temperature reaches 1440° C., it is kept for 12 hours.

1. Technical field:

[0001] The invention relates to a refractory material, in particular to a special composite low-aluminum mullite brick and a preparation method thereof. 2. Background technology:

[0002] With the large-scale, high wind temperature and high-intensity smelting of modern blast furnaces, the working conditions of blast furnaces are becoming more and more harsh, especially the upper part of blast furnaces has increasingly become a key area that restricts its long life and operating benefits. Through the unremitting efforts of many technicians and workers to research and explore, we have a better understanding of the reasons for the erosion of the blast furnace body. There are three main reasons: one is the wear and tear of the brick lining by the material and the erosion of the gas flow; the other The second is the chemical erosion of the brick lining by alkali metal and zinc vapor; the third is the destructive effect of thermal stress.

[0003] As an import...

Examples

Embodiment 1

[0028] Example 1: A special composite low-alumina mullite brick and its preparation method

[0029] Represented by weight percentage, the raw material ratio of the special composite low-aluminum mullite brick of the present invention is: 10% of 70 mullite with a particle size of 3-1mm, 40% of Shandong coke gemstone with a particle size of 3-1mm, and a particle size of 10% Shandong coke gemstones with a particle size of 1-0mm, 15% Shandong coke gemstones with a particle size of -200 mesh, 10% Jixi sillimanite (200 mesh particle size) and 15% zirconium powder (300 mesh particle size).

[0030] The preparation method of the product special compound low alumina mullite brick of the present invention:

[0031] According to the raw material ratio of the above-mentioned special composite low-aluminum mullite bricks, the prepared materials are poured into the wheel mill for mixing and grinding. The mixing time is 10 to 20 minutes. After the mixing and grinding, the mixed materials are...

Embodiment 2

[0032] Embodiment two: basically the same as embodiment one, the difference is:

[0033] Represented by weight percent, the raw material ratio of the special composite low-aluminum mullite brick of the present invention is: 20% of 60 mullite with a particle size of 3 to 1mm, 20% of Pingdingshan coke gemstones with a particle size of 3 to 1mm, and a particle size of 1-0mm Pingdingshan coke gemstones 20%, Pingdingshan coke gemstones with a particle size of -200 mesh 5%, Linkou sillimanite (particle size 240 mesh) 15% and zirconium powder (particle size 180 mesh) 20%.

[0034] The preparation method of the special composite low-aluminum mullite brick of the present invention differs from the first embodiment in that: the mixing and grinding time is 15 minutes, the material trapping time is 12 hours, and when the roasting temperature reaches 1420° C., it is kept for 13 hours.

Embodiment 3

[0035] Embodiment three: basically the same as embodiment one, the difference is:

[0036] Represented by weight percentage, the raw material ratio of the special composite low-aluminum mullite brick of the present invention is: 30% of 45 mullite with a particle size of 3 to 1mm, 20% of Pingdingshan coke gemstones with a particle size of 3 to 1mm, and a particle size of 10% Pingdingshan coke gems with a particle size of 1-0mm, 5% Pingdingshan coke gems with a particle size of -200 mesh, 10% Linkou sillimanite (280 mesh particle size) and 25% zirconium powder (240 mesh particle size).

[0037] The preparation method of the special composite low-alumina mullite brick of the present invention differs from the first example in that: the mixing and grinding time is 10 minutes, the material trapping time is 15 hours, and when the roasting temperature reaches 1440° C., it is kept for 12 hours.

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