Higher density grinding media generally results in faster grinding in a ball mill. An optimum grinding charge for a ball mill may be experimentally determined, however generally the range is from 20 to 50 of the mill volume, or to the center line. Approximately 30-40 of the ball charge will be void space.
Rod mills are very similar to ball mills, except they use long rods for grinding media. The rods grind the ore by tumbling within the the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6.
The grinding media is actually alumina particles held in place by an SiO2 glass phase. Sizes from 400 microns to over 1 inch in beads, balls, satellites ball with bands and cylinders. Low to medium cost, small sizes are more costly. Fused Zirconium oxide Grinding Media sp.gr. 3.8 Smooth surface leads to low mill wear and longevity. Sizes from 200 microns to 2.5mm.
Decreasing the rod size from 3 to 2 inches 76 to 64 mm at Tennessee Copper resulted in an increase of 22 in rod consumption, which can be directly attributed
Oct 20, 2016 Metallurgical ContentGRINDING RODS Steel Grinding RodsRod Mill Rod Weights FORGED STEEL GRINDING BALLS Grinding BallsGrinding Media Prices EstimatorGRINDING BALLS The subject of grinding media grinding balls amp grinding rods is still controversial. The following information is general and based upon facts gathered from many operations. General statements can
ROD MILL WORKING PRINCIPLE DOVE Rod Mill also referred to as steel rod mill shape is similar to DOVE Ball Mill, and is characterized by the use of steel Rods, instead of steel balls as grinding media. It is highly efficient grinding mill used as Dry Grinding Mill and Wet Grinding Mill.
The rod mill is loaded with the grinding media of steel bars. It consists of five parts including cylinder shell, feeding system, discharge system, main bearing and transmission system. It is available for both of the dry grinding and wet grinding fashion as the customers needs.