Is colloid mill a grinder or a crusher?

A colloid mill is not strictly a grinder or a pulverizer but is more accurately described as a **wet pulverizer**. It is designed for processing fluid and semi-liquid materials by subjecting them to high-speed rotation between a rotor and a stator. This creates a strong shear force, friction, and high-frequency vibration, effectively emulsifying, dispersing, homogenizing, and pulverizing the material into ultrafine particles.

The colloid mill operates based on the following principles:

- **Material Pressurization**: The material is forced through the adjustable gap between the rotor and stator, either by its own weight or external pressure (e.g., from a pump).

- **Mechanical Action**: The combination of shear forces, friction, and vortex effects breaks down the material, achieving fine grinding and emulsification.

Based on its structure, colloid mills are categorized into two types: **vertical colloid mills** and **split colloid mills**.