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Corundum breathable seat brick with high thermal shock resistance and production method thereof

A production method and the technology of the breathable seat, which are applied in the field of refractory materials, can solve the problems of affecting the service life of breathable bricks, increasing production and steel breakout accidents, poor thermal shock resistance, etc., so that it is not easy to peel off and crack, and improve thermal shock Good stability and thermal shock resistance

Inactive Publication Date: 2011-09-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to poor thermal shock resistance, the air-permeable seat brick often cracks, peels off or even breaks during use
Especially for small and medium-sized steel mills, due to the poor continuity of production, frequent temperature changes, and a large range of changes, the cracking, peeling and fracture of the air-permeable seat bricks are particularly serious, which greatly affects the service life of the air-permeable bricks and increases production and leakage. Therefore, it is of great practical significance to produce breathable seat bricks with high thermal shock stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] According to the designed ratio of air-permeable seat bricks, weigh 750 kg of No. 1 mixed corundum, 100 kg of magnesium-aluminum spinel powder with a particle size of 45-75 μm, 78 kg of pure calcium aluminate cement, 58 kg of dichromium trioxide, and tripolyphosphoric acid. 5 kg of sodium, 9 kg of steel fibers with a diameter of 100 μm and a length of 3 to 5 mm are placed in the HJW-60 concrete mixer produced by Wuxi Jianyi Instrument Machinery Co., Ltd., stirred for 5 to 10 minutes, and mixed evenly, then, add 40 to 45 kg of water, continue to stir for 5-10 minutes, and mix evenly to obtain mud; inject the mud into the mold, use ZT1-1 vibrating table to vibrate and compact until the surface is dense and flooded; demould, and dry at 50°C for 24-48 hours , to obtain the air-permeable seat brick; heat the air-permeable seat brick to 300°C and bake for 48 hours, discharge the remaining free water and crystal water, and obtain the heat-shock resistant corundum air-permeable ...

Embodiment 2

[0043] According to the designed ratio of air-permeable seat bricks, weigh 850 kg of No. 2 mixed corundum, 50 kg of fused magnesia with a particle size of 45-75 μm, 50 kg of aluminum dihydrogen phosphate, 48 kg of dichromium trioxide, and sodium lignosulfonate. 1 kg, 1 kg of metal aluminum powder with a particle size of 75 μm, put it in the HJW-60 concrete mixer produced by Wuxi Jianyi Instrument Machinery Co., Ltd., stir for 5-10 minutes, mix well, then add 50-55 kg of water and continue stirring Mix evenly for 5-10 minutes to obtain the mud material; inject the mud material into the mold, use the ZT1-1 vibrating table to vibrate and compact until the surface is dense and flooded; demould, and dry at 70°C for 24-48 hours to obtain the air-permeable seat brick adobe ; Heating the adobe of the air-permeable seat brick to 450° C. and baking for 52 hours, and discharging the remaining free water and crystal water in it to obtain a heat-shock-resistant corundum air-permeable seat b...

Embodiment 3

[0046] According to the designed air-permeable seat brick ratio, weigh 900 kg of No. 3 mixed corundum, 24 kg of magnesia-alumina spinel with a particle size of 45-75 μm and fused magnesia, and 24 kg of high-alumina cement and aluminum dihydrogen phosphate. 20 kg of dichromium trioxide, 7 kg of sodium hexametaphosphate and dispersed alumina, 20 kg of steel fibers with a diameter of 100 μm and a length of 3 to 5 mm and explosion-proof fibers with a diameter of 40 μm and a length of 3 to 5 mm, placed in In the HJW-60 concrete mixer produced by Wuxi Jianyi Instrument Machinery Co., Ltd., stir for 5-10 minutes, mix well, then add 55-60 kg of water, continue stirring for 5-10 minutes, mix well, and get mud; Inject into the mold, use ZT1-1 vibrating table to vibrate until the surface is dense and flooded; demould, and dry at 110°C for 24-48 hours to obtain the air-permeable seat brick adobe; heat the air-permeable seat brick adobe to 550°C and bake for 72 hours , discharge the remain...

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Abstract

The invention discloses a corundum breathable seat brick with high thermal shock resistance. The brick consists of mixed corundum, a magnesium-containing material, a binding agent, chromium oxide, a water reducing agent and an explosion-proof agent. The production method of the corundum breathable seat brick comprises the following steps: dosing, and mixing to prepare mud; placing the mud in a mould, performing shake densification, demoulding, and drying to obtain a breathable seat green brick; and heating the breathable seat green brick, and roasting to obtain the corundum breathable seat brick with thermal shock resistance. The component ratio is reasonable, the production and preparation method is simple, the prepared breathable seat brick has good high-temperature strength and thermal shock resistance; and the service life of the breathable seat brick can be effectively prolonged, the use security of the breathable brick can be increased, the replacement times of the breathable brick can be reduced, the production cost of enterprises can be reduced and the production efficiency of ferrous metallurgy can be increased. The corundum breathable seat brick can replace the existing breathable seat brick and be suitable for industrial production.

Description

technical field [0001] The invention relates to a corundum breathable seat brick used in the process of blowing argon into molten steel in a ladle in iron and steel smelting, in particular to a corundum breathable seat brick with high thermal shock stability and a production method; it belongs to the technical field of refractory materials. technical background: [0002] The ability of a material to resist sudden temperature changes without damage, that is, not to generate cracks, peeling, cracks, and fragments, is called thermal shock stability, and it is also called resistance to rapid cooling and rapid heating. [0003] The breathable seat brick is a refractory brick built on the bottom of the steel drum to fix the breathable brick. The breathable seat brick is very critical to the use of the breathable brick. Its most basic function is to fix the breathable brick and make the replacement of the breathable brick simple and efficient. At the same time, the seat brick can p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 程本军陈旺赵启成丁芳
Owner CENT SOUTH UNIV
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