- Time:Mar 02, 2023
Corundum wear-resistant plastic is a gas-hard amorphous refractory material that is made of brown corundum, silicon carbide and other high-quality refractory raw materials combined with special binders and additives in strict proportions. It is widely used in thermal kilns Parts with high shrinkage loss, such as circulating fluidized bed boilers, various heating furnaces, and high-temperature dust kilns in industries such as cement and building materials. Corundum wear-resistant plastic is different from other monolithic refractory materials in terms of construction methods. Compared with refractory castables, corundum wear-resistant plastic is easy to construct, without formwork and baking, which can greatly shorten the construction period.
The specific construction method is as follows:
1. Preparatory work before construction
(1) Generally speaking, corundum wear-resistant plastics need to be trapped before being transported to the construction site (in recent years, some new plastic products have been free from trapped materials). It is strictly forbidden to stack it in the open air during storage, and it is strictly forbidden to use corundum plastics exposed to rain and moisture.
(2) There are two construction methods for corundum wear-resistant plastics: ramming and smearing, and more methods of ramming construction are used than in the same period last year.
(3) Preparation of construction equipment: a forced mixer must be used for mixing, and it must be equipped with a tamping machine, a measuring bucket, a scale, a trimming knife, a wire brush, etc.
(4) The construction body that needs to weld grab nails, support anchor bricks or weld tortoise shell nets should be done before construction.
2. Mixing and mixing of materials
(1) Compounding: Corundum wear-resistant plastic, binder, and coagulant are packaged separately, and the proportioning design should be adjusted according to seasonal temperature changes. The most suitable temperature at the construction site is 5-25°C. On site, according to the power of the mixer, the mixing amount should be adjusted and determined in proportion. A special person is responsible for the supervision of the whole process of material proportioning, metering, and mixing, and records the proportioning amount of each time.
(2) Mixing: ① Before mixing, the interior of the mixer should be cleaned to prevent the cavity of the construction body caused by debris. ② Dry mix the wear-resistant and plastic base material for about 2 minutes first, then slowly add the binder after stirring evenly, then stir for 5 minutes, then stir for 1~2 minutes with the coagulant, and then start construction. ③The wear-resistant plastic after stirring must be used up within 40 minutes to prevent the plastic from coagulating and affecting the construction quality.
3. Technical requirements for construction
(1) Asphalt paint should be brushed on the parts that need to be constructed. There should be no dirt, dust and other sundries on the surface. After the asphalt paint is completely dry, the filler should be rammed. After construction, the construction body is strictly prohibited from seeing water.
(2) It is required to be compacted and smooth by ramming. If there is a protruding part, it should be smoothed with a trimming knife, and the flatness can be checked with a ruler. If the construction thickness is not enough, one-third of the construction body must be shoveled off, and filling and ramming should be carried out again to prevent the construction body from delamination.
(3) Follow-up work such as expansion joints, construction thickness, vent holes, and surface treatment must be left in accordance with the requirements.
4. Maintenance
The completed construction body should be naturally cured in a dry environment for 5-7 days at a temperature of 15-35°C. Avoid construction vibration during maintenance.
5. Crack treatment
If there are cracks in the construction body during the maintenance process, if they are larger than 1mm, they should be treated; when the crack width is 1~3mm, the method of filling the cracks can be used, that is, spray glue on the cracks to moisten and soften, and tap with a rubber hammer. The crack is closed; when the crack is larger than 3mm, the corundum wear-resistant plastic crack should be dug into a wedge-shaped opening with a large inside and a small outside, and the glue should be moistened and softened, and carefully filled with corundum wear-resistant plastic.
Under the premise of ensuring the quality of materials, doing the above five construction steps well is the key to ensure that the wear-resistant plastic lining can obtain the expected design life cycle or even extend the life cycle, and it must not be sloppy.
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