Semi-silica brick content less than 30% Al2O3 and more than 65%SiO2. it is made of quartz sand and kaolin in special grain fineness,after shaping,drying.As it contains more quartz, the property is between clay brick and silica brick, residual expansion,erosion-resistance,acid slag resistance and RUL all higher than clay bricks.It is used as the coke oven bottom, liner and flue etc.
physical and chemical index:
items | JK-65 |
SiO2% | ≥65 |
Al2O3% | <30 |
K2O+Na2O% | ≤1.0 |
AP% | ≤24 |
CCS(MPa) | ≥25 |
0.2MPa RUL (°C) | ≥1350 |
PLC(1350°C*2h) % | -0.2~+0.2 |
Technology and materials
Type | N-1 | N-2a | N-2b | N-3a | N-3b |
Refractoriness(℃) | ≥1760 | ≥1740 | ≥1740 | ≥1720 | ≥1720 |
CS(Mpa) | ≥30 | ≥25 | ≥20 | ≥20 | ≥15 |
AP(%) | ≤22 | ≤24 | ≤26 | ≤24 | ≤26 |
PLC(1400℃×2h)% | −0.4~+0.1 | −0.5~+0.1 | −0.5~+0.2 | −0.5~+0.2 | −0.5~+0.2 |
Type | N-4 | N-5 | N-6 |
Refractoriness(℃) | ≥1700 | ≥1660 | ≥1580 |
CS(Mpa) | ≥20 | ≥15 | ≥15 |
AP(%) | ≤24 | ≤26 | ≤28 |
PLC(1400℃×2h)% | −0.5~+0.2 | −0.5~+0.2 | −0.5~+0.2 |
