Air brick for special steel refining and preparation method thereof

A technology of breathable brick and special steel, applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of harsh working environment, shortened service life and increased workload of breathable bricks, and achieves excellent high temperature performance and breathable performance. , The effect of preventing cracks and improving strength

Inactive Publication Date: 2016-06-08
LUOYANG LIER REFRACTORY MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the increasing demand for clean steel and high-quality steel, the proportion of refining outside the furnace increases, and the refining time of molten steel increases accordingly. The working load on the bricks increases; when smelting special steel types, in most cases, due to the penetration of molten steel or slag, vertical and horizontal fractures, etc. More stringent, at present, the air brick has become the bottleneck factor that limits the life of the ladle and the low-cost operation

Method used

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  • Air brick for special steel refining and preparation method thereof
  • Air brick for special steel refining and preparation method thereof
  • Air brick for special steel refining and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The percentage that is used for present embodiment to prepare the permeable brick raw material of ladle is:

[0033] The particle size of plate corundum is 6~3mm, 3~1mm, 1~0mm respectively 30%, 20%, 15%; 325 mesh platy corundum fine powder 9%; activated alumina fine powder 6%; 325 mesh fused chromium Corundum fine powder 12% (alumina / chromium oxide = 80 / 18); zirconia 3%; pure calcium aluminate cement 5%; dispersed alumina superplasticizer (additional) 0.5%.

[0034] The preparation method of this embodiment is the same as that of Comparative Example 1, adding 3.66% water of the total mass of solid materials.

[0035] The results of using the obtained ladle permeable brick:

[0036] It is used in a 150-ton ladle in a domestic steel factory to smelt special steel types. The average number of times of use has reached more than 18 times, and the refining time has exceeded 100 hours. In case of spalling, the service life of traditional ventilation bricks is increased by ab...

Embodiment 2

[0038] The percentage that is used for present embodiment to prepare the permeable brick raw material of ladle is:

[0039] The percentages of platy corundum particle diameters of 6-3mm, 3-1mm, and 1-0mm are 30%, 15% and 16% respectively; white corundum fine powder 200 mesh 3%; platy corundum fine powder 325 mesh 5%; Activated alumina fine powder 8%; fused chromium corundum fine powder 0.5-0mm and 325 mesh fine powder 5% and 9% respectively (alumina / chromium oxide=70 / 28); zirconia 3%; pure calcium aluminate cement 6%; plus 0.3% of dispersed alumina superplasticizer.

[0040] The preparation steps of the present embodiment are as follows:

[0041] (1) First, fully mix corundum 1-0mm and fine powder, activated alumina micro-powder, fused chromium corundum 0.5-0mm particles and fine powder, pure calcium aluminate cement, and dispersed alumina high-efficiency water reducer for 10 minutes, then Add corundum pellets, continue mixing until fully uniform, add clean tap water, the am...

Embodiment 3

[0048] The percentage that is used for the present embodiment to prepare the permeable brick of ladle is:

[0049] The percentages of platy corundum particle sizes of 6-3mm, 3-1mm, and 1-0mm are 33%, 13% and 10% respectively; platy corundum fine powder 325 mesh is 7%; white corundum 3-1mm is 5%; Activated alumina fine powder 6%; fused chromium corundum fine powder 1-0mm and 325 mesh fine powder are 7% and 10% respectively (alumina / chromium oxide=60 / 38), zirconia fine powder 3%; pure calcium aluminate 6% cement; dispersed alumina plus 0.5% superplasticizer.

[0050] The preparation steps of this example are the same as those of Example 2, and water with a total mass of solid materials of 3.72% is added.

[0051] The results of using the obtained ladle permeable brick:

[0052] It is used in a 120-ton ladle in a domestic steel factory to smelt special steel types. The average number of times of use is more than 30 times, and the refining time is more than 150 hours. In case o...

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Abstract

The invention relates to an air brick for special steel refining, particularly an air brick for special steel refining and a preparation method thereof. The air brick is composed of the following components in percentage by mass: 60-75% of corundum particle and fine powder, 6-11% of activated alumina micropowder, 8-20% of electrofused chrome corundum material, 3-8% of pure calcium aluminate cement, 2-4% of zirconium oxide and 0.1-0.6% of additional water reducing agent. The air brick is suitable for smelting of special steel grades, and has the advantages of excellent high-temperature properties, excellent air permeability, low breaking possibility, favorable high-temperature folding strength and favorable thermal shock resistance. By adopting the curing schedule, the cement in the material can be sufficiently hydrated, thereby enhancing the strength of the semifinished product, and avoiding generating microcracks of possible collisions in the transportation process (the cracks can further extend in the high-temperature calcination process). The firing schedule is adopted to prevent the air brick cracks from generation and enhance the yield of the air bricks.

Description

【Technical field】 [0001] The invention relates to a breathable brick for special steel refining, and relates to a breathable brick for special steel refinement and a preparation method thereof. 【Background technique】 [0002] In the iron and steel metallurgy industry, after the molten steel enters the ladle, the purpose of stirring the molten steel is achieved by blowing inert gas into the molten steel, which can even the temperature and chemical composition of the molten steel, promote the floating of inclusions or control the shape of inclusions. A technology commonly used in the modern metallurgical industry, the role of breathable bricks in the metallurgical industry is becoming more and more important. [0003] With the increasing demand for clean steel and high-quality steel, the proportion of refining outside the furnace increases, and the refining time of molten steel increases accordingly. The working load on the bricks increases; when smelting special steel types,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C21C7/072B22D41/02
CPCC04B35/101B22D41/02C04B2235/3244C21C7/072
Inventor 崔庆阳李有奇寇志奇赵继增吴林林卞光辉李江涛王冰伟马超辉林莎
Owner LUOYANG LIER REFRACTORY MATERIAL
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