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Refractory Ramming Material
According to different blast furnace types and different material design requirements, carbon ramming material is mainly used in the gap between the carbon bricks at the bottom of the blast furnace and the bottom sealing plate and between the carbon bricks in the hearth and the cooling stave.
Description
1.Application of carbon ramming material
All parts require that the carbon ramming material after ramming material has a certain strength and density, fills every corner and small gap, and meets the requirements of no leakage of molten iron and gas, and the thermal conductivity of the carbon ramming material The performance of the carbon bricks and cooling stave that is hot in the blast furnace should be basically consistent, so as not to affect the life of the blast furnace, so as to maintain the normal production of the blast furnace.
Whether it is adding admixtures to the carbon ramming material, changing the properties of the material through in-situ reaction at high temperature, or changing the structure of the local material from a design point of view, so that the carbon ramming material layer can reach the same level as the carbon ramming material when the working temperature rises. The thermal conductivity of the bricks and the cooling wall is matched to ensure the normal heat conduction without damaging the overall construction structure, so as to meet the requirements of improving the life of the blast furnace.
2. Product parameters
Ramming material | High alumina | Magnesia | Magnesia- chrome | Magnesia- alumina- chrome | Corundum Chromium zircon | Alumina- zirconia | |
Chemical Composition % | Al2O3 | 83 | 2.3 | 6 | ≤15 | 74 | 68 |
ZrO2 | 1.1 | 93(MgO) | 59(MgO) | 55-60(MgO) | 6.6 | 11 | |
Cr2O3 | - | - | 16 | 15-20 | 15 | - | |
Compressive strength MPa | 110°C | 38.5 | 62 | 43.5 | 74.1(150°C) | 5 | 26.5 |
1000°C | 47.6 | 54 | 25.8 | 32 | 62.2 | 42.6 | |
1600°C | 67.2 | - | 38.5 | 53 | 123.2 (1500°C) | 38.4 (1400°C) | |
Refractoriness under load °C | - | - | 1500 | - | 1700 | 1340 | |
Reheating linear change % | 0.6 | -0.15 (1600°C) | -0.6 | -0.14 | - | 0.93 (1400°C) | |
Apparent porosity % | - | 14 | 13 | - | 15 | 23 | |
Bulk density g/cm3 | 2.7 | 2.95 | 2.7 | 3.05 | 3.33 | 2.7 | |
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