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High-strength refractory castables are mainly used in high-temperature and easy-wear parts of thermal kilns. For example, the front kiln mouth of the cement pre-calciner kiln, the three-channel coal injection pipe; the refining lance, and the pouring or ramming parts of the lining of the metallurgical furnace such as RH and DH vacuum degassing devices, and can also be used as heat-resistant linings in petroleum catalytic devices.
1. Storage of high-strength refractory castables
High-strength refractory castables must be stored in dry warehouses.
2. Brief description of the construction of high-strength refractory castables
2.1 Water: Clean water must be used, with a pH value between 6-8. Mixing water should be accurately weighed.
2.2 Mixing: It is recommended to use a forced mixer. All mixing tools must be cleaned and mixed until the ingredients are uniform.
2.3 Summary of construction of high-strength refractory castables:
2.3.1 The pouring surface of all molds used should be coated with a layer of engine oil.
2.3.2 All embedded metal parts should be coated with a layer of asphalt paint before pouring.
2.3.3 The high-strength refractory castable should be used within 30 minutes after mixing. It should be poured to the specified thickness at one time and vibrated until it is completely dense.
2.3.4 The curing humidity should not be less than 90%, the curing temperature should be between 15-25°C and the mold should be demoulded 24 hours after pouring. The total curing time is 3 hours.
3. Drying system for high-strength refractory castables
Linings or structures made of high-strength refractory castables should be properly heat-treated before use.
3.1 Rise to 110°C at a rate of 25°C/h and keep warm for more than 4 hours.
3.2 Rise to 400℃ at a speed of 40℃/h and keep warm for more than 4h.
3.3 Rise to operating temperature at a speed of 100-15°C/h.
3.4 According to the needs and possibilities of different parts, keep the temperature constant for more than 2 hours at the operating temperature.
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