The main causes of flash are:
1, cold silo mixing. Cold silos generally have 5 or 4 bins. Each bin has a certain size of pellets. If different specifications of cold materials are mixed or misplaced during the loading process, it will cause a certain period of time. The shortage of one size of pellets and the overflow of another size of pellets easily break the supply balance between the hot and cold silos.
2, the raw material of the same specification particle composition variability. Due to the small number of large gravel yards on the market, the pavements need to use different sizes of gravel, and the types of crushers and screens used in each quarry are different. Therefore, they are purchased from different gravel yards and are nominally the same. The size of the crushed stone has a large variation in particle composition, which makes it difficult for the mixing building to control the balance of the feeding during the mixing process, thereby causing a surplus or shortage of a certain size of the stone.
3, the choice of hot silo screen. In theory, if the hot silo grading is stable, no matter how large the size of the sieve hole is set, the gradation of the mixture will not be affected, but the hot silo screening of the mixing building has the shrinkage and non-expandability of the particle size. Therefore, a certain size of pellets may be mixed with pellets smaller than their own specifications. The amount of this content often has a great influence on the selection of the screen and whether or not the material is overflowed. If the mix curve is smooth and the screen is properly selected, the finished product produced in the mixing plant can guarantee gradation and no overflow. Otherwise, the phenomenon of flashing can not be avoided, or even quite serious, which will result in greater material waste and economic loss.