Preparation method of tundish air brick

A breathable brick and tundish technology, applied in the field of iron and steel metallurgy, can solve the problems of dry gel powder not easy to disperse, steel slag easy to permeate and corrode, and uneven distribution of pores, etc., to achieve slag erosion resistance to molten steel erosion, not easy to permeate and corrode, and gas permeability Good results

Inactive Publication Date: 2014-05-14
WUXI CHENGBO SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dry gel powder is not easy to disperse, the pores are unevenly distributed, there are still many large pores, and the steel slag is easy to penetrate and corrode, resulting in short life, and the introduction of whiskers also seals many through pores, and its efficiency needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for preparing a tundish air-permeable brick. The air-permeable brick consists of the following components in parts by weight: 45 parts of platy corundum particles, 14 parts of mullite particles, 5 parts of chromium oxide particles, 6 parts of white corundum fine powder, α-Al 2 o 3 2 parts of fine powder, 3.5 parts of silicon micropowder, 0.4 part of sodium hexametaphosphate, 0.5 part of yellow dextrin, 0.1 part of azodicarbonamide, 0.4 part of boric acid, and 0.1 part of aluminum fluoride; the preparation method comprises the following steps:

[0019] 1) Put the plate-like corundum particles, mullite particles, and chromium oxide particles into the mixer and mix for 5 minutes, then take them out for later use;

[0020] 2) White corundum fine powder, α-Al 2 o 3 Put the fine powder and microsilica powder into the mixer and mix for 10 minutes;

[0021] 3) Add the mixture prepared in step 1) to the mixer in step 2), and mix for another 10 minutes, then add sodi...

Embodiment 2

[0025] A method for preparing a tundish air-permeable brick. The air-permeable brick consists of the following components in parts by weight: 55 parts of platy corundum particles, 10 parts of mullite particles, 8 parts of chromium oxide particles, 4 parts of white corundum fine powder, α-Al 2 o 3 3 parts of fine powder, 1.5 parts of silicon micropowder, 0.6 part of sodium hexametaphosphate, 0.3 part of yellow dextrin, 0.3 part of azodicarbonamide, 0.2 part of boric acid, and 0.3 part of aluminum fluoride; the preparation method comprises the following steps:

[0026] 1) Put the plate-shaped corundum particles, mullite particles, and chromium oxide particles into the mixer and mix for 8 minutes, then take them out for use;

[0027] 2) White corundum fine powder, α-Al 2 o 3 Put the fine powder and microsilica powder into the mixer and mix for 15 minutes;

[0028] 3) Add the mixture prepared in step 1) to the mixer in step 2), and mix for 15 minutes, then add sodium hexametap...

Embodiment 3

[0032] A method for preparing a tundish air-permeable brick. The air-permeable brick consists of the following components in parts by weight: 50 parts of platy corundum particles, 12 parts of mullite particles, 6.5 parts of chromium oxide particles, 5 parts of white corundum fine powder, α-Al 2 o 3 2.5 parts of fine powder, 2.5 parts of microsilica powder, 0.5 part of sodium hexametaphosphate, 0.4 part of yellow dextrin, 0.2 part of azodicarbonamide, 0.3 part of boric acid, and 0.2 part of aluminum fluoride; the preparation method comprises the following steps:

[0033] 1) Put the plate-shaped corundum particles, mullite particles, and chromium oxide particles into the mixer and mix for 6 minutes, then take them out for use;

[0034] 2) White corundum fine powder, α-Al 2 o 3 Put the fine powder and microsilica powder into the mixer and mix for 13 minutes;

[0035] 3) Add the mixture prepared in step 1) to the mixer in step 2), and mix for 13 minutes, then add sodium hexame...

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PUM

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Abstract

The invention discloses a preparation method of a tundish air brick. The preparation method comprises the following steps of: (1) placing 45-55 parts by weight of tabular corundum granules, 10-14 parts by weight of mullite granules and 5-8 parts by weight of chromic oxide granules into a mixer, and mixing for 5-8 minutes; (2) placing 4-6 parts by weight of white corundum fine powder, 2-3 parts by weight of alpha-Al2O3 fine powder and 1.5-3.5 parts by weight of silica micropowder into the mixer, and mixing for 10-15 minutes; (3) adding a mixture prepared from the step (1) to the mixer used in the step (2), mixing for 10-15 minute again, adding 0.4-0.6 part by weight of sodium hexametaphosphate, 0.3-0.5 part by weight of yellow dextrin, 0.1-0.3 part by weight of azodicarbonamide, 0.2-0.4 part by weight of boric acid and 0.1-0.3 part by weight of aluminum fluoride, and then mixing for 10-15 minutes again; (4) ageing for 1-2 hours, pressing for forming by using a press machine, and drying into a drying kiln at 200 DEG C for 24 hours; (5) firing under the condition of 1250-1350 DEG C for 2-3 hours.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preparing a tundish air-permeable brick. Background technique [0002] With the development of tundish metallurgical technology, blowing inert gas into the molten steel for stirring through the breathable brick installed at the bottom of the tundish can not only effectively improve the flow of molten steel, prolong the residence time of molten steel, and promote the mixing of molten steel It is conducive to uniform temperature, and can use the generated micro-bubbles to capture inclusions, promote the floating and removal of inclusions, reduce the total oxygen content in molten steel, and facilitate the production of clean steel. Therefore, it is an important subject to develop a tundish diffused air brick with good air permeability, thermal shock stability, high strength and resistance to steel slag penetration and erosion. [0003] The alkaline m...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622C04B35/105
Inventor 李飞
Owner WUXI CHENGBO SCI & TECH DEV
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