What are the standards for castable construction in rotary kilns? In the construction of refractory castable, many construction teams do not have professional construction qualifications, and the project delay or material waste caused by unqualified construction quality often occurs. In fact, in the national standard, the construction, maintenance, demoulding and construction of refractory castable prefabricated parts have put forward very clear specifications. Details are as follows:
Before castable construction, the shape and cleanliness of the equipment to be poured should be strictly checked, the construction equipment is in good condition, and the vibration tools have good spare parts.
Insulated masonry surfaces in contact with refractory castables shall be waterproofed.
Refractory castables should be stirred with a forced agitator. Mixing time and amount of liquid added should follow product instructions. Mixers, hoppers and weighing containers should be cleaned when changing material grades.
The template used in castable construction can be steel plate or hard plate, and the template should be solid, rigid, unformed, not displaced, and not leaking. Steel formwork should be coated with release agent, and wood formwork should be coated with waterproof paint.
Under the premise of ensuring the construction performance, the amount of water added to the castable is controlled strictly according to the instructions, and the amount of water added is less but not much.
Mix with a forced mixer, dry first, then stir with 80% water, and then, depending on the degree of dryness and humidity, slowly add the remaining water and continue mixing until you get the right working consistency. Stirring time shall not be less than 5 min.
What are the standards for castable construction in rotary kilns? Castable is used throughout the bucket and bag. The stirred castable is generally used up within 30 min, and the use time should be shortened in a high temperature and dry working environment. The castable is initially concentrated, or even caked, and cannot be poured into the mold, and water should not be added for reuse.
The castable is poured onto the mold frame, and should be stratified immediately with a vibrator. The height of each layer should not exceed 300 mm, and the vibration spacing should be about 250 mm. Try to avoid touching the anchor when shaking, and do not have a long earthquake and a large earthquake in the same position.
After observing the surface of the castable, the vibrating rod should be slowly pulled out to avoid segregation and voidage in the castable layer. The castable body after pouring is no longer subjected to pressure and impact before solidification.
Steel bars or metal inserts in refractory castables shall be located on unheated surfaces. The contact part of the steel bar or metal insert connected to the refractory castable shall be provided with an expansion buffer layer in accordance with the design procedure.