Discharge concentration, also known as grinding concentration, refers to the ratio of ore to water within the grinding mill cylinder. It can be determined by measuring the discharge concentration. The grinding concentration directly affects the fluidity of the slurry and its ability to transport ore particles within the cylinder, as well as the effectiveness of the grinding media. Therefore, a grinding mill operator must be adept at controlling the grinding concentration. Production practice has shown that the optimal grinding concentration is between 60% and 83%. For coarse grinding, the grinding concentration is slightly higher, generally controlled between 75% and 83%; for fine grinding, the grinding concentration can be lower, approximately between 65% and 75%.
The grinding concentration should also differ depending on the density of the ore. For ores with higher density, the grinding concentration can be controlled higher; for ores with lower density, the grinding concentration should be lower.