Composite carbon brick is a kind of composite refractory brick. Based on different composition, composite carbon bricks can be divided into alumina composite carbon brick, magnesia composite carbon brick, alumina magnesia composite carbon brick, etc. Alumina composite carbon brick’s raw materials are supreme class bauxite, corundum and graphite, added with special additives. After shaped by static molding, dried and sintered in high temperature kiln, composite carbon brick is finally produced. Composite carbon brick is applicable for different volumes of blast furnaces at the parts such as furnace bottom, furnace hearth, tuyere, cinder notch and so on.
Composite Carbon Brick Characteristics
Good thermal conductivity.
Strong iron liquid corrosion resistance.
Strong alkaline molten slag corrosion resistance.
Good scouring resistance.
Long service life, can better protect furnace hearth.
Composite Carbon Brick Physicochemical Index
Item
Index
RSCC-1
RSCC-2
Al2O3 % ≥
70
75
C % ≥
9
9
Bulk Density g/cm3 ≥
2.7
2.85
AP % ≤
16
15
CCS Mpa ≥
55
60
Air permeability mDa ≤
1.0
0.8
Average radium % ≤
1
1
Iron liquid corrosion index % ≤
2.0
2.0
Oxidation rate % ≤
1.0
1.0
Slag corrosion resistance % ≤
3
2
Thermal conductivity（200℃）w/m·k ≥
12
15
Composite Carbon Bricks Applications
Composite carbon brick is applicable for different volumes of blast furnaces at the parts such as furnace bottom, furnace hearth, tuyere, cinder notch and so on. Composite carbon brick has both the advantages of traditional ceramic cup brick’s excellent iron liquid corrosion resistance, slag corrosion resistance alkali corrosion resistance and the advantages of carbon brick’s good thermal stress resistance. Meanwhile, composite carbon brick overcomes the shortcoming of carbon brick’s weak iron liquid corrosion resistance and oxidation resistance. Composite carbon brick almost has all the good high temperature properties of traditional ceramic cup bricks and avoids each one’s shortcoming. It can significantly prolong blast furnace’s service life. Lots of application has tested that when composite carbon brick is used in ceramic cup, blast furnace’s service life can be prolonged more than 7 years. Composite carbon brick can be used at different parts of blast furnace, especially at furnace bottom and furnace hearth, has important significance for blast furnace’s long service life.
