Causes of erosion of blast furnace body and selection of refractory materials

 

Erosion reason	Requirements for refractory properties
1.Wear of charge drop process	1.High crushing strength
2.Erosion wear of upward gas flow	2.The performance of alkali resistant metal corrosion resistance is good
3.Alkali metal erosion	3.Low porosity
4.Destruction of CO	4.Low iron oxide content
The upper and middle furnace refractories for blast furnace are: clay brick, sillimanite brick, dense clay brick, high alumina brick etc.
The lower part of the shaft, belly erosion causes
Erosion reason	Requirements for refractory properties
1.Chemical erosion of primary slag	1.Slag resistance is good
2.Wear of down charge	2.The performance of alkali resistant metal corrosion resistance is good
3.Erosion of metallic iron	3.High - temperature strength
4.Erosion wear of gas flow	4.Good thermal conductivity
5.Spalling due to thermal shock	5.Low porosity
?	6.Good thermal shock stability
From the waist to the lower part of the shaft lining, thermal shock is decreased by high temperature and high pressure gas charge and increase the wear and temperature changes, but also by the chemical high FeO high basicity slag erosion, more serious is alkali metals and zinc vapor caused by carbon deposition and chemical reaction, the refractory brick organization embrittlement lose strength. And suitable for refractory brick is: aluminum brick, silicon carbide, hot pressing small carbon bricks and semi graphitized carbon - silicon carbide brick.
Lining erosion reason
Erosion reason	Requirements for refractory properties
1.Corrosion and penetration of molten iron	1.Resistance to molten iron corrosion, good permeability
2.Circulating erosion corrosion of molten iron	2.Good thermal conductivity
3.Alkali corrosion	3. The performance of alkali resistant metal corrosion resistance is good
4.Destructive effect of thermal stress	4.Low porosity , microporosity
Hearth wall masonry taphole above by erosion of iron, iron mouth following the "dead iron layer", by the iron soaked, by erosion of molten iron flow in the furnace wall and the bottom of the junction. The masonry has good anti erosion ability of slag, molten iron and mechanical washing. Most of the hearth and bottom of large and medium blast furnace are made of carbon brick and carbon brick ceramic cup composite hearth.

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Article Source:Causes of erosion of blast furnace body and selection of refractory materials
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