The centrifugal force and friction generated by the rotation of the fuselage bring the material and the grinding medium to a certain height and then fall. Impact and friction grind the material into fine powders.
It is widely used in cement, silicate, new construction material, refractory material, chemical fertilizer, ferrous metal and non-ferrous as well as ceramics, and widely applied to dry or wet grinding for ores and grindable materials. The wet type is often equipped with a classifier, and the dry type is configured with a suction and separation device.
Both of the dry and wet ball mills are composed of feeding port, discharging port, turning part, and transmission parts such as retarder, small transmission gear, motor, electronic control. The wet grinding can be widely used, because most of the minerals can be wet milled.
The dry grinding is used on a smaller scale, but some materials can only be dry milled. So what are the differences between them.
The ball mill is equipped with a cylindrical rotating device and two bins, which can rotate by gears. The discharge port is straight, and there are also air intake devices, dust exhaust pipes, and dust collectors.
The structure of the ball mill is simple. The discharge port is horn-shaped, and there is a screw device in it, which is convenient for discharging materials.
Dry grinding means that when the ore is ground into the size we need, the powder will be brought out from the ball mill by the airflow.
The material from the feeding device is uniformly fed into the first bin of the mill by the hollow shaft spiral. This bin has stepped lining or corrugated lining, which is filled with steel balls of different specifications.
The rotation of the cylinder generates centrifugal force to bring the steel ball to a certain height, and then fall, which will hit and grind the material. After the material is coarse grinding in the first bin, it will enter the second bin through the single-layer partition plate.
A fine milling machine in which raw material and ball media such as ceramics are fed into a horizontally rotating drum, and milling is carried out by collision with ball media and by crushing and its impact with the media and drum inner wall surface.
Rotating speed N differs, depending on the size of mill and meling media, whether or not there areinner lifting bars, type of milling dry or wet. In general, optimum speed is represented by theratio NNc for critical speed Nc. Critical speed Nc is a rotating speed of the time when millingmedia is crimped on the wall of the mill by centrifugal force while mill speed is being increased.
Calculate rotating speed at milling media 30mm, Dry type 75. Wet type 65.for dry typeN Nc10070 80 for wet typeN Nc10060 70.
Only material and milling media arefed into the drum.Less contaminant from liners andmilling media.
Material and milling media are fedinto the drum with water or organicsolvent.Suitable to mix and compoundmaterials.
Wet And Dry Process Ball Mill China. Dry ball mill wetball mill is a common equipment in grinding equipment but also the material after the crushing and screening operation the key equipment for ing to the classification of grinding the ball mill can be divided into dry ball mill and wet bal. Chat Online.
In general, ball mills can be operated either wet or dry and are capable of producing products on the order of 100 um. This duty represents reduction ratios as great as 100. The ball mill, an intermediate and fine-grinding device, is a tumbling drum with a 40 to 50 filling of balls.
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