The corundum self-flowing castable for ladle was initially used for the permanent lining of the tundish and ladle with high-aluminum self-flowing refractory castable with large volume density, but the heat dissipation was fast, which caused the temperature of the molten steel to drop or the cold steel phenomenon to occur. Later, self-flowing refractory castable with slightly smaller volume density was used, and the effect was better.
The particle grading and bone powder ratio of the corundum self-flowing castable for ladle, the fluidity of the corundum self-flowing castable for ladle is greatly affected by its particle grading and bone powder ratio. Now, the corundum spinel self-flowing castable is taken as an example to illustrate. The material is made of fused white corundum with Al2O3>99.6%, sintered spinel with Al2O3>76.7% and MgO>22.6%, CA-80 cement, ultrafine alumina powder with Al2O3 of 99.65% and water reducer. The mass ratio of bone powder, water dosage is 6.5%, and water reducer is 0.12% of the matrix.
The mixing time of the corundum self-flowing castable for ladle can flow freely, exhaust gas and automatically compact within a certain period of time, so it needs a suitable solidification time. The self-flow value of the corundum self-flowing castable for ladle is tested immediately after mixing, and then stopped for 10min, 20min and 30min and tested again. The self-flow values are 210mm, 210mm, 205mm and 200mm respectively. That is to say, the mixing material should be used up within 30min, otherwise it will reduce its fluidity and affect the performance of the castable.
Corundum self-flowing castable for ladle is a high-tech product developed based on the solid fluid theory and the application characteristics of refractory materials. Self-flowing castable can degas and level without vibration by its own gravity, thus achieving densification.
Corundum self-flowing castable for ladle has the following advantages: good fluidity and reasonable solidification time; labor-saving, quick and convenient; high strength and long life; good thermal insulation performance, high temperature resistance, good thermal shock stability, corrosion resistance and erosion resistance.
Corundum self-flowing castable for ladle can be used in all parts where low-cement castable, ultra-low-cement castable and cement-free castable are used. Corundum castable is suitable for filling the bottom of the ladle and around the base bricks and the top of the electric furnace; mullite self-flowing castable and high-aluminum self-flowing castable are suitable for permanent lining of ladle and middle ladle and water-cooling pipe wrapping and heating furnace top and furnace wall. In addition, self-flowing castable can also be mechanized.
Refractory materials for ladle system
Corundum self-flowing chemical index
|
project |
HX-SFG-E |
HX-TSFG-E |
HX-SFG-K |
|
|
chemical composition (%); ≥ |
Al2O3+MgO |
90 |
83 |
- |
|
Al2O3+MgO+Cr2O3 |
- |
- |
90 |
|
|
Bulk density (g/cm³);≥ |
110℃ ×16h |
2.85 |
2.8 |
2.85 |
|
1500℃×3h |
2.85 |
2.8 |
2.85 |
|
|
Compressive strength (MPa);≥ |
110℃×16h |
30 |
30 |
20 |
|
1500℃×3h |
90 |
80 |
60 |
|
|
Flexural strength(MPa);≥ |
110℃×16h |
4 |
4 |
5 |
|
1500℃×3h |
12 |
10 |
12 |
|
|
Reference construction water addition amount (%) |
5.0±0.5 |
6.0±0.5 |
5.0±0.5 |
|
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