The dry grinding process is as follows: the raw materials are separately crushed to a certain particle size, then the ingredients are finely ground, and the finely ground screened materials are returned to the fine grinding process; The screened materials meeting the granularity requirements are humidified and granulated into ceramic powder particles with the water content of about 10% ~ 12% by a humidifying granulator; After drying and vibration screening, the screened material enters the vibrating screen again after being slightly crushed, and the screened material is sent to the silo for aging to obtain ceramic powder for dry pressing molding. The technological process can be expressed as follows: raw materials are coarse, medium and fine → batching → fine grinding → screening → humidification → granulation → drying → screening → aging → dry pressing molding.
Dry grinding has great advantages in energy saving;
The comparison table of raw material preparation cost between dry method and wet method published by Yike Energy Saving official website shows that the wet method consumes 60~ 100kg of coal, 60 ~ 80kw·h of electricity and 35~40kg of water per ton of powder, occupying space1500 ~ 2000m2; However, the dry process consumes 0 coal, 40 ~ 60KW·h electricity and 9~ 12kg water per ton of powder, occupying 300~500m2 space. According to the daily production of 300 tons of flour, the annual comprehensive cost saving is more than 7.5 million, and the water saving is more than 30 thousand tons. Yao Changqing said that dry grinding not only meets the national policy requirements of energy conservation and emission reduction, but also has practical benefits for enterprises.