Raymond mill is divided into dry grinding and wet grinding. Wet grinding is the most commonly used method, with high efficiency and uniform particle size. In the ball milling process, the large particles will crack under the action of grinding and impact of the ball milling medium, and the crack growth will break into small particles, that is, the so-called fine grinding process.

If it is dry grinding, the cracks formed during the process of ball milling are likely to be squeezed and closed due to the extrusion between particles. Cracks cannot expand effectively, and large particles cannot break rapidly and form small particles.

But if it is wet grinding, the liquid ball milling medium (water or anhydrous ethanol, etc.) will enter into a crack, blocking the closure of the crack and thus effectively expanding the crack rapidly. This will greatly improve the efficiency of Raymond mill.