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Microporous graphite silicon carbide brick

A technology of silicon carbide bricks and graphite, applied in the field of microporous graphite silicon carbide bricks, can solve the problems of furnace lining damage, shortened blast furnace service life, thermal stress damage, etc., and achieves good thermal conductivity, excellent thermal shock resistance, and alkali metal. Strong erosive effect

Active Publication Date: 2013-06-05
鲁山天诺炉衬材料有限公司
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

During the production process of the blast furnace, the lining materials of the bosh, furnace waist, and the middle and lower areas of the furnace body are subjected to the impact of heat load in the furnace for a long time, thermal stress damage caused by temperature fluctuations, material wear, air flow erosion, slag, alkali metal Corrosion causes damage to the furnace lining, which seriously affects the normal operation of the blast furnace and shortens the service life of the first generation blast furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment 1: A kind of microporous graphite silicon carbide brick, with SiC, decomposed graphite, Si, Ti as main raw material, with modified phenolic resin as binder, raw material, binder are composed according to the following weight percentage: Si micropowder 5~12 15-45 parts of decomposed graphite powder, 1-6 parts of Ti micropowder, 1-5 parts of boron oxide, 40-75 parts of SiC particles, 6.5-12 parts of modified phenolic resin; The brick adobe baked at ~450℃ at low temperature is impregnated with asphalt, and then fired at high temperature of 1280~1380℃ under reducing atmosphere.

[0009] The preparation process is as follows: After weighing the raw materials and binders according to the proportion, put them into the kneader, knead them for 30 minutes at 70-80°C, and use a molded vibration molding machine to make bricks; bake at 350-450°C for 10~ After 15 hours, the adobe is vacuumized in the dipping tank, the vacuum pressure is ≥0.09MPa, and the pressure is kept f...

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PUM

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Abstract

The invention relates to a microporous graphite silicon carbide brick and belongs to the field of refractory material for iron making blast furnace. The microporous graphite silicon carbide brick is prepared from main raw materials of SiC, Si, Ti and pyrolytic graphite and a binder of modified phenol-formaldehyde resin through steps of pugging, die vibration forming, low temperature baking, immersion and high temperature sintering. The brick has excellent thermal conductivity, alkali resistance, inoxidizability, slag erosiveness, small average aperture and apertures with an aperture larger than 1 mum having a volume no more than 4%, and suits for bosh, belly, middle and lower part of a large blast furnace. Besides, the brick has a long service life and substantial economic benefits.

Description

technical field [0001] The invention relates to a microporous graphite silicon carbide brick used for the inner lining of a blast furnace. technical background [0002] At present, the bosh, furnace waist, and middle and lower parts of the furnace body of large domestic blast furnaces are mostly lined with graphite bricks, Si3N4 bonded silicon carbide bricks, high alumina bricks, and fired microporous aluminum carbon bricks. During the blast furnace production process, the lining materials in the bosh, furnace waist, and the middle and lower areas of the furnace are subjected to the impact of heat load in the furnace for a long time, thermal stress damage caused by temperature fluctuations, material wear, air flow erosion, slag, alkali metal Corrosion causes damage to the furnace lining, which seriously affects the normal operation of the blast furnace and shortens the service life of the first generation blast furnace. In order to meet the development needs of increasingly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 叶乐叶繁王豆豆孙真真李璐
Owner 鲁山天诺炉衬材料有限公司
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