You know processing equipment in four grinding mill equipment it has four types: rod mill. Blind ball sails, since the mill and pebble mill. With steel bars for the grinding media called rod mill, ball mill called balls as grinding media to the ore itself called for the grinding media from the mill to gravel for the grinding media is called pebble mill, which ball mill grinding operation is the most widely used grinding machine. At present, many large and small mining companies have chosen are such devices. Next, we are speaking about the same in the mainstream four grinding equipment. 1. Holding rod mill grinding media and mill ore line contact, which has a certain selective grinding effect, uniform particle size, less over crushed ore particles. Therefore, commonly used in the cabin of the ore or the need for selective mushroom crushed ore kibble. In the coarse grinding, product size of 1 - When 3mm, rod mill production capacity greater than the same size of a ball mill; rod mill feed size is generally 15- 25mm; when the rod mill diameter greater than 2400mm, feed size up to 40-50mm. 2. There are lattice-type ball mill and overflow ball mill milling sail two kinds. Lattice-type ball mill is divided into short tube-type and long simply type categories. Brief version for coarse grinding, long simply type used for fine grinding. 3. The lattice type of discharge end with a grid plate mill. Its pulp level is low, can be discharged in qualified products. Reduce over crushed ore; large ball, and adapted reasonably ball; high grinding efficiency, unit production capacity than the overflow ball mill for about 15% higher. The disadvantage is that complex structure, easy to wear plaid plate, weight, and higher prices. Lattice-type ball mill grinding product size limit of 0.2-0.3mm, for the first stage of grinding, often with spiral classifier body into closed. The overflow ball mill structure is simple, easy maintenance, fine grinding product (one less than 0. 2mm). But its high level of discharge, long pulp residence time in a ball mill, the production capacity per unit volume of low and uneven row of ore particle size, easy to produce over crushed for two-stage grinding process of grinding and intermediate second segment Products regrinding.