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What kinds of commonly used refractory materials are used in the wall of blast furnace?

2015/11/18 view:

Introduction: blast furnace wall with more varieties of refractory material, furnace body upper generally use clay brick and high alumina brick, hearth parts of carbonaceous products, bosh, belly and the lower part of the shaft with carbonaceous products, mullite brick, corundum brick or silicon carbide brick special refractory materials. At the same time, in the furnace wall, the refractory materials are also used.

Blast furnace wall with more varieties of refractory material, furnace body upper generally uses the clay brick and high alumina brick, hearth parts of carbonaceous products, bosh, belly and the lower part of the shaft with carbonaceous products, mullite brick, corundum refractory bricks or silicon carbide brick special refractory materials. At the same time, in the furnace wall, the refractory materials are also used.

The use of refractory materials for blast furnace in cooling equipment and operation is normal, and its use effect is satisfactory.

The average life expectancy of the Soviet blast furnace, 60 years 7, 8 years, after the blast furnace. The average life expectancy of the United States is about 5.3 years, the life of the blast furnace in the United States is 3.5~10 years, the average life span is 6.5 years. The average life expectancy of USA other companies BF 4.5 years; German BF campaign is about 6 years.

The variety and quality of refractory materials used in blast furnace wall are very obvious. For example. The blast furnace clay brick, alkalized iron and alkali oxides were greatly reduced; bulk density, apparent porosity from 20% reduced to 10%, the compressive strength increased more than one times; refractoriness from 1710 DEG C to 1750 DEG C to refractoriness under load, deformation (4%) increased nearly 100 DEG C.

Dense clay brick or kaolin brick is mainly used in the Soviet Union blast furnace stack, belly and shaft at the lower part of the AI:O: content of 40 and 45% and low iron low alkali high density kaolin brick. According to reports, the use of these bricks in nearly 50 (including 5000 m) blast furnace, its life expectancy reached 10~11 years.

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