LF-VD Furnace Refractory Material
LV-VD furnace is steel liquid refinery equipment, which’s working condition is very harsh, should endure all kinds of high temperature corrosion, chemical corrosion, mechanical stress and thermal stress. So high quality refractory products should be adopted in according parts of LF-VD furnaces.
Magnesia carbon bricks are mainly used at furnace bottom and working lining. Corundum precast block which has high mechanical strength is mainly used at furnace bottom impacting zone. Magnesia chrome ramming mass is mainly used at furnace wall corner. Magnesia chrome mortar can be used for the masonry of magnesia chrome bricks.
LF-VD Furnace Refractory Material Physiochemical Index
| Name | Magnesia carbon brick | Corundum precast block | Magnesia mortar | Magnesia chrome ramming mass | Magnesia carbon brick |
| Application | Bottom, wall working lining | Bottom impacting zone | Steel ladle working lining | Wall corner | Below slag line, free surface working lining |
| MgO % | 92.5 | / | 96 | 52 | 92.5 |
| CaO % | 2.5 | / | 2.2 | Cr2O3,19 | 2.5 |
| Fe2O3 % | 4 | / | 0.3 | 19 | 4 |
| SiO2 % | / | / | 1 | 0.5 | 0.6 |
| Al2O3 %≥ | / | 97 | / | 6 | / |
| F.C % ≥ | 5 | / | / | / | 10 |
| Apparent porosity % | ≤7 | / | / | / | <7 |
| Bulk density g/cm3 ≥ | 3.07 | 2.98 | / | / | 2.98 |
| Compression strength Mpa | >.40 | 80 | / | 25(110℃) | >30 |
| Name | Magnesia carbon brick | Magnesia chrome brick | Magnesia chrome mortar | Magnesia castable (ramming mass) | Chrome silica ladle filler sand |
| Application | Slag line working lining | Slag line permanent lining | Magnesia chrome brick | Ladle nozzle | Tapping hole |
| MgO % | 96 | 60 | 52 | 91 | 6~12 |
| CaO % | 2.3 | Cr2O3, 18 | Cr2O3, 19 | 2.0 | Cr2O3 >30 |
| Fe2O3 % | 0.3 | 14 | 19 | 5.8 | 20 |
| SiO2 % | 1.2 | 0.5 | 0.5 | 0.5 | 30 |
| Al2O3 %≥ | / | 6 | 6 | 0.3 | 5~10 |
| F.C % ≥ | 10 | / | / | / | / |
| Apparent porosity % | ≤7 | <15 | / | / | / |
| Bulk density g/cm3 ≥ | 3.00 | 3.26 | / | / | / |
| Compression strength Mpa | >30 | >30 | / | 30(110℃) | / |
| Name | Corundum block | Magnesia block | Corundum brick | Magnesia brick | Corundum mullite brick |
| Application | Purging plug, sleeve brick, pocket block | Purging plug, sleeve brick, pocket block | Purging plug, sleeve brick, pocket block | Dispersive type Purging plug | Purging plug core plate |
| MgO % | / | 97 | / | 97 | / |
| CaO % | 1.8 | 1.7 | 2.4 | 1.9 | / |
| Fe2O3 % | / | / | / | / | / |
| SiO2 % | 0.1 | 0.6 | 0.1 | 0.5 | 9 |
| Al2O3 %≥ | 88 | / | 97 | / | 90 |
| F.C % ≥ | / | / | / | / | / |
| Apparent porosity % | / | <25 | / | 26 | / |
| Bulk density g/cm3 ≥ | 3.22 | 2.75 | 3.00 | 2.60 | 2.95 |
| Compression strength Mpa | >60 | >30 | >50 | >30 | >60 |
| Thermal conductivity w.(m.K)-1(1000℃) | / | 3.0 | 2.8 | 3.0 | / |
| Name | Alumina magnesia castable | Alumina chrome castable | Corundum castable | Magnesia chrome castable | Alumina chrome chamotte |
| Application | Purging brick surrounding | Purging brick surrounding | Purging brick surrounding | Lower Dispersive purging brick | Purging brick |
| MgO % | 8 | / | / | 77 | / |
| CaO % | 1 | 1.8 | 2.4 | / | / |
| Cr2O3 % | / | 10 | / | 12 | 2.0 |
| SiO2 % | 0.1 | / | 0.1 | / | 7 |
| Al2O3 %≥ | 88 | 88 | 97 | / | 84 |
| F.C % ≥ | / | / | / | / | / |
| Apparent porosity % | / | / | / | 26 | / |
| Bulk density g/cm3 ≥ | 3.00 | 3.22 | 3.00 | 2.60 | / |
| Compression strength Mpa | >60 | >60 | >50 | >30 | / |
| Rupture strength Mpa(1400℃) | 12 | 15 | 8 | / | / |
