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Sillimanite brick for large-scale blast furnace hot blast stove and method of manufacturing the same

The technology of sillimanite and hot blast stove is applied in the field of refractory materials, which can solve the problems of poor thermal shock resistance, decreased performance, low density of silica bricks, etc., and achieves the effects of good performance and high temperature performance improvement and improvement.

Inactive Publication Date: 2011-07-20
巩义市第五耐火材料总厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silica bricks also have disadvantages: poor volume stability at low temperatures, and large volume changes will occur between 0 and 600 °C; poor thermal shock resistance at low temperatures, and easy to crack; silica bricks have low density and small heat capacity. When used as checker bricks, its heat storage is not large
Among them, the andalusite refractory material has been well promoted in hot blast stoves, but at present, most manufacturers at home and abroad mostly add a small amount of andalusite to the material, using high-alumina bauxite as the main raw material, which makes the performance of the product decline and cannot be refractory. Meet the requirements of long life of hot blast furnace

Method used

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  • Sillimanite brick for large-scale blast furnace hot blast stove and method of manufacturing the same
  • Sillimanite brick for large-scale blast furnace hot blast stove and method of manufacturing the same
  • Sillimanite brick for large-scale blast furnace hot blast stove and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: sillimanite brick for large blast furnace hot blast stove and production method thereof

[0059] The raw materials of sillimanite bricks are: a-Al with a particle size of 3 to 1 mm in weight percentage 2 O 3 40% of base mullite, 45% of high-purity sillimanite with particle size less than 0.5mm, 15% of co-milled powder; additionally added density 1.23g / cm 3 The lignin aqueous solution is used as a binder, and the addition amount accounts for 3% of the total weight of the above-mentioned raw materials.

[0060] The composition of the co-milled powder is as follows: in terms of weight percentage, the particle size is less than or equal to 280 mesh corundum powder 25%, the particle size is less than or equal to 200 mesh andalusite powder 25%, the particle size is less than or equal to 325 mesh zirconia powder 10%; 2 O 3 Micropowder 20%, particle size ≤180 mesh 20% bound clay.

[0061] a-Al in this example 2 O 3 Base mullite, select the fused mullite of M...

Embodiment 2

[0074] Embodiment 2: sillimanite brick for large blast furnace hot blast stove and production method thereof

[0075] The raw materials of sillimanite bricks are: a-Al with a particle size of 3 to 1 mm in weight percentage 2 O 3 35% of base mullite, 55% of high-purity sillimanite with particle size less than 0.5mm, 10% of co-milled powder; additionally added density 1.22g / cm 3 The added amount of lignin aqueous solution accounts for 3% of the total weight of the above-mentioned raw materials.

[0076] The composition of the co-milled powder is as follows: by weight percentage, the particle size is less than or equal to 280 mesh white corundum powder 23%, the particle size is less than or equal to 200 mesh andalusite powder 22%, the particle size is less than or equal to 325 mesh zirconia 6%; the particle size is less than or equal to 625 mesh a-Al 2 O 3 Micropowder 29%, particle size ≤180 mesh bound clay 20%.

[0077] a-Al in this example 2 O 3 The base mullite is select...

Embodiment 3

[0080] Embodiment 3: It is basically the same as Embodiment 1, the difference is:

[0081] The raw material of sillimanite brick is: a-Al 2 O 3 40% of base mullite, 40% of high-purity sillimanite, 20% of co-milled powder; additionally added density 1.24g / cm 3 The added amount of lignin aqueous solution accounts for 5% of the total weight of the above-mentioned raw materials.

[0082] The composition of the co-milled powder is: corundum powder 20%, andalusite powder 25%, zirconia powder 10%; a-Al 2 O 3 Micropowder 25%, bound clay 20%. The particle size requirements of each raw material are the same as in Example 1, and will not be repeated.

[0083] a-Al in this example 2 O 3 The base mullite is selected from the fused mullite of Meihekou in Table 5 and the sintered mullite a produced by Jiangdu, and the ratio of the two is 3:1. Andalusite 2 in Table 7 is selected for the pillar stone powder # .

[0084] The production method is basically the same as Example 1, and th...

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Abstract

The invention discloses a sillimanite brick used in the large blast furnace stove and a production method thereof. The raw material of the sillimanite brick contains 30 to 60 percent of mullite, 30 to 60 percent of sillimanite or / and andalusite and 10 to 40 percent of common milling powder, and additionally, a binder, whose weight accounts for 2 to 5 percent of the total weight of the above rawmaterials, is added into the above raw materials. The production method of the brick comprises mulling, aging, molding, drying and firing processes; and green bricks are heat preserved for 8 to 12 hours under 1480 to 1520 DEG C to be fired, and are taken out of the kiln after being cooled naturally. The creep rate of the sillimanite brick is only 0.179 percent in the conditions of 1450 DEG C and 50 hours, the compressive strength reaches 76.2 Mpa, and the service life of the product is long. Thus, the product can completely meet the performance requirements of the sillimanite brick used in the blast furnace stove, and the product surpasses the performances of the same kind products at home and abroad and ends the history that the product has been imported from foreign countries all the time.

Description

1. Technical field: [0001] The invention relates to the field of refractory materials, in particular to a sillimanite brick for a large blast furnace hot blast stove and a production method thereof. 2. Background technology: [0002] At present, the main forms of refractory materials for domestic hot blast stoves are: (1) silica brick - high alumina brick - clay brick; (2) low creep high alumina brick (mullite brick) - high alumina brick - clay brick; ( 3) Silica brick - low creep brick - high alumina brick - clay brick. No matter which form is used, the material of the high temperature part is the key to the material selection of the hot blast stove. Taken together, there are two types of key materials: silica bricks and low creep bricks. When the hot blast temperature is 1100-1200°C, high alumina bricks, mullite bricks and silica bricks are generally used as furnace lining or checker bricks; when the hot blast temperature is higher than 1200°C, high alumina bricks cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 林彬荫李明欢赵永安何晓静校松波张新玉张媛
Owner 巩义市第五耐火材料总厂
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