Performance of a Hammer Bar Type Feed Mill (II)

Particle Distribution Curve of Crushed Products by Open Circuit Method

Abstract

The authors investigated about particle distribution curve of some grains crushed with the hammer bar type mill used in the first report by open circuit method.
The following results are obtained.
1. Independent of crushing conditions, the particle distribution curve of grains by open circuit method satisfies the Rosin-Rammler's law.
2. At specific speed of rotation of hammers, the index n of Rosin-Rammler's formula decreases rapidly when the flow rate of grains to be crushed arrives at specific values.
3. The index n is little influenced by the number of hammers, and is inversely proportional to the diameter of holes in screen.
4. Within the definite specific range of the speed of revolution of hammers (r. p. m) the index n increases a little in accordance with it.