A rod mill

The rod mill is characterized in that the grinding medium is in line contact with the ore during the grinding process, and thus has a certain selective grinding effect, the product granularity is relatively uniform, and the crushed ore particles are less. In the coarse grinding, the product size is 1~3mm, the ball mill processing capacity is greater than the same size of the ball mill , when used for fine grinding, the product particle size is less than 0.5mm, the grinding effect is not the same as the specification of the ball mill. The grain size of the rod mill is generally 15~25mm. When the diameter of the rod mill is more than 2400mm, the upper limit of the ore size can reach 40~50mm, and the upper limit of the product size of the rod mill can reach 1~3mm.

Currently, most use rod mills with a diameter of less than 4500 mm.

B ball mill

Beneficiation plant commonly used anesthesia machine has a lattice-type ball mill and overflow type two. The lattice type is divided into two types: short tube type and long tube type. Usually the short tube type is used for rough grinding and the long tube type is used for fine grinding.

The main advantages of the overflow ball mill are simple structure, good management, easy maintenance, fine grain size of the grinding products (generally less than 0.2mm). The disadvantages are high drainage liquid surface, long residence time of the slurry in the grinding machine, and unit volume treatment. The amount is low, the size of the ore discharge is uneven, and it is easy to produce excessive pulverization.

The overflow ball mill is suitable for the second stage of grinding and intermediate product re-grinding in the two-stage grinding process.

The grid end of the lattice type ball mill is provided with a grid plate. The advantage is that the slurry surface is relatively low, the qualified product can be discharged in time, the over-grinding of the ore is reduced, the grinding efficiency is high, and the unit treatment volume is about 15% higher than the overflow ball mill of the same specification; the ball loading is more. The disadvantage is that the structure is complicated, the grid plate is easy to break, the maintenance is difficult, the weight is large, and the equipment price is high.

The upper limit of the particle size of the ore type ball mill mineral product is generally 0.2~0.3mm. Therefore, it is often used in the first stage of grinding, and often forms a closed circuit with the spiral classifier.

Large-scale concentrators should use large-scale grinding machines. YONGPING copper ore using a diameter of 5030mm USA overflow-type ball mill with a diameter of 600mm as a hydrocyclone classifying device. In the case of large-scale grinding machines for mineral processing, it is suitable to use an overflow type ball mill in order to facilitate the use of classification equipment (hydrocyclone) to reduce the wear of the cyclone.

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