Question

A fluid energy mill is used for

• A. Cutting
• B. Grinding
• C. Ultra-grinding
• D. Crushing

Hint:

Fluid energy mill or jet mill is used for ultra-fine grinding by high velocity particle-particle collision.

Answer 1

The Correct Option is C

A fluid energy mill is also called a jet mill. In this mill, high velocity fluid jets are used for size reduction. Particles are accelerated by compressed air or steam. The particles collide with each other at high velocity. Due to these collisions, particles break into very fine sizes. Fluid energy mills are used for producing extremely fine powders. This type of size reduction is called ultra-grinding. Cutting is done by cutters. Ordinary grinding is done by ball mills or rod mills. Crushing is done by jaw crushers, gyratory crushers, or roll crushers. Therefore, a fluid energy mill is used for: \[ \text{Ultra-grinding} \]