In a vertical raw mill, the separation process primarily revolves around the efficient separation of fine particles from the coarse ones. This is typically accomplished through a combination of mechanical and aerodynamic principles. Here's a simplified breakdown of the process:
Grinding and Transport: Raw materials are initially introduced into the mill. Large rollers and a rotating table grind the material into finer particles. As the material is ground, it forms a powder that is lifted by an air stream created by a built-in fan.
Classifying: The ground material is carried upward by the air stream towards the separator. The separator is a critical component that is often integrated into the top of the mill. It classifies the particles based on size.
Separation Mechanism: The separator employs centrifugal force, gravity, and air flow dynamics to separate fine particles from coarser ones. The finer particles are lifted higher by the air flow, while the coarser particles, due to their weight, fall back down to the grinding table to be reground.
Collection: The fine particles, now separated, are directed towards a collection system, typically involving cyclones or bag filters, where they are removed from the air stream and collected in a hopper or storage silo.
Return Flow: Any remaining coarse particles are directed back to the grinding table for further grinding, ensuring a continuous and efficient cycle until the desired fineness is achieved.
This integrated and cyclical process in a vertical raw mill enables the continuous and efficient grinding and separation of raw materials, facilitating the production of fine, usable output.
