The efficiency in grinding process makes the attritor mill the most and advanced effective grinding mill compared to other type of mills for grinding harder materials like alumina, zircon, borites, nitrides etc to sub micron particle sizes. Due to its effective way of transmitting the energy directly to the grinding media, the effectiveness of grinding process is very superior and achieving sub micron size particle size with shorter grinding cycle time is possible with only attritor mill.
The following equation has been developed and used for relating grinding time to media diameter and agitator speed.
T= KD(3)/√N
T = Grinding time required to reach a certain particle size median.
K = A constant used which varies depending upon the slurry processed,
type of grinding media the attritor model used.
D = Diameter of the media.
N = The rpm of the shaft.
In other words we can say the grinding time is directly proportional to the diameter of grinding media and inversely proportional to the square route of the rpm. Hence increasing the rpm decreases the grinding time and decreasing the rpm increases the grinding time. Like wise increasing the size of grinding media increases the grinding time and decreasing the grinding media size decreases the grinding time.
