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Air brick fired at low temperature by using gel and preparation process thereof

A technology of low-temperature firing and air-permeable bricks, which is applied in the field of gel combined low-temperature firing air-permeable bricks and its preparation technology, to achieve the effects of improving erosivity, less gas consumption, and stable use

Active Publication Date: 2014-02-05
洛阳利尔功能材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above problems existing in the air-permeable bricks and production process in the prior art, the present invention provides a gel-bonded low-temperature firing air-permeable brick and its preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A gel-bonded low-temperature firing air-permeable brick, the raw material of which is composed of aggregate and fine powder with a weight ratio of 6.5:3.5~7:3, and the aggregate is composed of 27-30 parts with a particle size of 6 -3mm tabular alumina, 15-18 parts of tabular alumina with a particle size of 3-1mm, 9-13 parts of tabular alumina with a particle size of 1-0.5mm, 8-10 parts of tabular alumina with a particle size of 0.5-0mm and 6-9 parts of spinel particles with a particle size of 0.5-0mm, the fine powder consists of 5-8 parts of 325 mesh tabular alumina, 7-10 parts of 325 mesh spinel fine powder, 3-5 parts of alumina gel It consists of fine powder, 3-9 parts of activated alumina fine powder, 2-3 parts of 200 mesh chromium trioxide fine powder and 0.1-0.4 parts of Ammann ADS superplasticizer.

[0024] A process for preparing the air-permeable brick as described above, comprising the following steps:

[0025] Step 1: After mixing the aggregate and powder eve...

Embodiment 2

[0033] A gel-bonded low-temperature firing air-permeable brick, the raw material of which is composed of aggregate and fine powder with a weight ratio of 6.5:3.5~7:3, and the aggregate is composed of 27-30 parts with a particle size of 6 -3mm tabular alumina, 15-18 parts of tabular alumina with a particle size of 3-1mm, 9-13 parts of tabular alumina with a particle size of 1-0.5mm, 8-10 parts of tabular alumina with a particle size of 0.5-0mm and 6-9 parts of spinel particles with a particle size of 0.5-0mm, the fine powder consists of 5-8 parts of 325 mesh tabular alumina, 7-10 parts of 325 mesh spinel fine powder, 3-5 parts of alumina gel It consists of fine powder, 3-9 parts of activated alumina fine powder, 2-3 parts of 200 mesh chromium trioxide fine powder and 0.1-0.4 parts of Ammann ADW water reducer.

[0034] A process for preparing the air-permeable brick as described above, comprising the following steps:

[0035] Step 1: After mixing the aggregate and powder evenly...

Embodiment 3

[0040] A gel-bonded low-temperature firing air-permeable brick, the raw material of which is composed of aggregate and fine powder with a weight ratio of 6.5:3.5~7:3, and the aggregate is composed of 30-35 parts with a particle size of 6 -3mm tabular alumina, 10-15 parts of tabular alumina with a particle size of 3-1mm, 9-13 parts of tabular alumina with a particle size of 1-0.5mm, 10-12 parts of tabular alumina with a particle size of 0.5-0mm and 4-6 parts of spinel particles with a particle size of 0.5-0mm, the fine powder consists of 5-8 parts of 325 mesh tabular alumina, 7-10 parts of 325 mesh spinel fine powder, 2-3 parts of alumina gel It consists of fine powder, 9-14 parts of activated alumina fine powder, 3-5 parts of 200-mesh chromium trioxide fine powder and 0.1-0.4 parts of Ammann ADW water reducer.

[0041] A process for preparing the air-permeable brick as described above, comprising the following steps:

[0042] Step 1: After mixing the aggregate and powder even...

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Abstract

The invention relates to an air brick fired at low temperature by using a gel and a preparation process of the air brick. The raw materials of the air brick include an aggregate and a fine powder, wherein the weight ratio of the aggregate to the fine powder is 6.5:3.5-7:3; the alumina gel fine powder is used as a binding agent; due to the addition of the alumina gel particle having quite high chemical activity into the air brick in the firing process of the air brick at the temperature being lower than 800 DEG C, the air brick body has high strength; the addition of chromium sesquioxide fine powder can effectively improve the capacities of resisting the permeability of molten steel and the erosion by the steel slag in the use process of the air brick, so as to ensure the good application performance of the air brick; and the firing temperature of the air brick provided by the invention is controlled at 500-800 DEG C, but the firing temperature of a traditional air brick is generally higher than 1300 DEG C, and therefore, the cost of the fuel gas can be saved by about 60% and the firing time can be shortened by about 50%.

Description

technical field [0001] The invention relates to a preparation process of a bottom-blown air-permeable brick core for ladle refining in the iron and steel metallurgy industry, in particular to a gel-bonded low-temperature fired air-permeable brick and its preparation process. Background technique [0002] Gas blowing treatment at the bottom of the ladle is a simple out-of-furnace refining process for degassing molten steel and removing non-metallic inclusions. This method passes gas into the molten steel for stirring to accelerate the metallurgical process and uniform molten steel temperature and chemical composition , to facilitate removal of inclusions or to control the morphology of inclusions. Blowing gas into the molten steel can be obtained in two ways, one is to use an air blow gun to insert molten steel from the top of the ladle for blowing operation; the other is to use a breathable brick arranged at the bottom of the ladle to send gas into the Among them, the botto...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/63
Inventor 徐兵李有奇吴林林寇志奇赵继增谢保卫张春杰
Owner 洛阳利尔功能材料有限公司
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