Refractory and heat-insulation material for blast furnace air supply system and preparation method of refractory and heat-insulation material

A heat insulation material and air supply system technology, which is applied in the field of refractory materials and its preparation, can solve problems such as short service life, easy cracks, and air leakage, and achieve the effects of increased service life, reduced air shutdown rate, and obvious effects

Inactive Publication Date: 2015-11-11
石家庄巨力科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air supply system of the ironmaking blast furnace is installed around the blast furnace, which sends the hot air heated by the hot blast furnace at 1250-1350°C into the blast furnace. The fire-resistant and heat-insulating material layer inside the part works for a long time under the harsh conditions of high temperature, high pressure and high flow rate, and is limited by its own structure. There are problems such as poor heat insulation performance, easy cracks, and falling off. These problems lead to defects such as high temperature on the outer wall of the air supply system, air

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the ratio of ingredients: AL 2 o 3 75.5Kg, SIO 2 19Kg, floating beads 1.1Kg, alumina hollow balls 1.2Kg, white mud 0.92Kg, silicon micropowder 1.2Kg, sodium tripolyphosphate 0.40Kg, α-alumina micropowder 4.5Kg, andalusite 1Kg, sillimanite 1.5Kg, blue Spar 2Kg, potassium feldspar 1.1Kg. Send each raw material and 7% water of the total weight of raw materials into the mixing device and mix them evenly. The mixing speed is not more than 150M / S, and the mixing time is not less than 20 minutes. After the material is poured, the refractory and heat-insulating material is poured, and the refractory and heat-insulated material is poured while vibrating; normal temperature curing: curing temperature is 15°C, curing time is 20 minutes; high temperature curing: curing temperature is 200°C, and the temperature is uniformly raised to 50°C first. Keep warm for 30 minutes, then uniformly heat up to 200°C over 24 hours, keep warm at this temperature for 24 hours, and fi...

Embodiment 2

[0030] According to the ratio of ingredients: AL 2 o 3 76Kg, SIO 219.6Kg, floating beads 1.2Kg, alumina hollow spheres 1.1Kg, lime clay 1Kg, silicon micropowder 1.3Kg, sodium tripolyphosphate 0.38Kg, α-alumina micropowder 4.2Kg, andalusite 2Kg, sillimanite 1Kg, kyanite Stone 2.5Kg, potassium feldspar 1.2Kg. Send each raw material and 8% water of the total weight of raw materials into the mixing device and mix them evenly. The mixing speed is not more than 150M / S, and the mixing time is not less than 30 minutes. After the material is poured, the refractory and heat-insulating material is poured, and the refractory and heat-insulated material is poured while vibrating; room temperature curing: curing temperature is 25 ° C, curing time is 30 minutes; high temperature curing: curing temperature is 200 ° C, first uniformly heated to 50 ° C, Keep warm for 30 minutes, then uniformly heat up to 200°C over 24 hours, keep warm under this condition for 24 hours, and finally cool down ...

Embodiment 3

[0032] According to the ratio of ingredients: AL 2 o 3 77Kg, SIO 2 19.5Kg, floating beads 1.3Kg, alumina hollow balls 1.3Kg, white mud 1.09Kg, silicon micropowder 1.7Kg, sodium tripolyphosphate 0.42Kg, α-alumina micropowder 4.8Kg, andalusite 2.5Kg, sillimanite 1.4Kg , kyanite 2.3Kg, potassium feldspar 1.5Kg. Send each raw material and 7% water of the total weight of the raw material into the mixing device to fully mix evenly, the mixing speed is not more than 150M / S, the mixing time is not less than 25 minutes, and the vibration frequency is 3300HZ / S when mixing; After the material is poured, the refractory and heat-insulating material is poured, and the refractory and heat-insulated material is poured while vibrating; room temperature curing: curing temperature is 20 ° C, curing time is 30 minutes; high temperature curing: curing temperature is 200 ° C, first uniformly heated to 50 ° C, Keep warm for 30 minutes, then uniformly heat up to 200°C over 24 hours, keep warm at t...

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PUM

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Abstract

The invention relates to a refractory and heat-insulation material for a blast furnace air supply system and a preparation method of the refractory and heat-insulation material. The refractory and heat-insulation material is prepared from the following raw materials: AL2O3, SIO2, floating beads, alumina hollow balls, white mud, silica powder, sodium tripolyphosphate, alpha-alumina micro powder, andalusite, sillimanite, kyanite and potassium feldspar. According to the refractory and heat-insulation material for the blast furnace air supply system and the preparation method of the refractory and heat-insulation material, provided by the invention, andalusite, sillimanite, kyanite and potassium feldspar are added to the refractory and heat-insulation material according to a certain proportion, therefore the linear change rate of the refractory and heat-insulation material is increased to be a positive value, slight volume expansion of the refractory and heat-insulation material under the working temperature of 1250-1350 DEG C can be realized, the disadvantage of cracking of the refractory and heat-insulation material caused by volume shrinkage under the condition of a high temperature can be basically eliminated, the fire-resistant and heat-insulation effect is obvious, the service life of throat parts can be improved by nearly one time, and the field downtime ratio is reduced by nearly 35%.

Description

technical field [0001] The invention relates to a refractory material and a preparation method thereof, in particular to a refractory and heat insulating material used in a blast furnace air supply system and a preparation method thereof. Background technique [0002] In blast furnace ironmaking equipment in the metallurgical industry, refractory and heat insulating materials are generally used in related components with a working temperature above 600 °C. The air supply system of the ironmaking blast furnace is installed around the blast furnace, which sends the hot air heated by the hot blast furnace at 1250-1350°C into the blast furnace. The fire-resistant and heat-insulating material layer inside the part works for a long time under the harsh conditions of high temperature, high pressure and high flow rate, and is limited by its own structure. There are problems such as poor heat insulation performance, easy cracks, and falling off. These problems lead to defects such a...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10
Inventor 朱惠红黄山郭朝张朝阳赵晓亮
Owner 石家庄巨力科技股份有限公司
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