Abstract
Investigating ball mill grinding from the kinetic point of view, the authors studied the effect of properties of samples and feed weight on grinding rate constant of first order.
Used samples were silica glass, borosilica glass, soda glass, quartz, feldspar, limestone, marble, gypsum and talc. The pebble mill consisted of a 12.8cm-diameter by 13.2cm-long cylinder, and the tests were done at the speed of 88.1% of critical one. The grinding medium was 40 balls, each of which has a diameter of 3cm and their total weight was 1180g.
The experiments were performed on -14+20 mesh feed size to obtain grinding rate constant K. The following correlation of dimensionless Vickers hardness HV and K was obtained K∝HV-0.23
Futhermore, dimensionless feed weight W had large effect on grinding rate constant K, and the correlation of HV, W and K was obtained K∝HV-0.23·W-1.5
