For overflow ball mills, the charge should not exceed 45% of the mill volume . For grate discharge mills, the charge should occupy about 50% of the mill volume . Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e.,
Grate ball mill is mainly composed of barrel part, feeding part, discharging part, bearing, transmission system and lubrication system. After the grate type ball mill starts, the material is fed into the barrel through the feed end, and the barrel then rotates around the horizontal axis according to a certain speed.
Below is the write up of how a ball mill works, is used to crush ore and an explanation regarding its effectiveness in gold mining. The Purpose of Milling First of all, in order to get the best out of how this particular equipment is used it is important to get acquainted with knowledge on what it is, and is made of.
How a Grate Discharge Ball Mill Works. Here I try to explain how ground slurry is discharged from a grate ball mill . How it works is, the slurry flows across the grate as it would a screen panel. On the other side of the grate/screens are veins like a pump impeller. As the mill turns/rotates the slurry is pumped out and discharged.