Different grinding media is a significant difference between these three kinds of mills. Not only the types of media, but also the charge ratio is different. The following table gives a brief summary:
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The biggest feature of SAG mills is the large crushing ratio, which can crush and grind the materials to 0.074mm at one time, accounting for more than 20% to 40% of the total product. The crushing ratio can reach 4000 5000, which is more than ten times higher than that of the ball mill machine and rod grinding machine.
Ball mill：Ball mills are the most widely used one. Rod mill：The rod mill has the highest efficiency when the feed size is lt;30mm and the discharge size is about 3mm with uniform particle size and light overcrushing phenomenon. SAG mill:When the weight of the SAG mill is more than 75%, the output is high and the energy consumption is low with a light degree of over crushing. Taking quartz as an example, the following table shows the specific situation of quartz stone when using these three kinds of grinding machines: The discharging shapes of different mills will be different. As shown in the following figure, the length and flatness value of rod mill discharge are higher, while that of the ball mill is the opposite. The roundness and width value of ball mill discharge is higher, and rod mill is in contrast. That is, the discharge of the ball mill is more round and the rod mill longer.
These three types of grinding equipment have different length diameter ratios, that is, different L/D ratios. Besides, the diameter of the hollow shaft at both ends of the barrel of the SAG mill is large and the length is short. The diameter is large for its large feeding size. Generally, the inner diameter of the hollow shaft is about 2 times of the larger ore feeding size, which is about 0.2 0.3 times of the inner diameter of the ball mill. The short length is for the higher speed of the flow of ore.
The internal structures of the ball mill, rod mill and SAG are different. The following table analyzes the feeding part, bearing part, rotary part, liner shape, transmission part and slow transmission device:
SAG mill:The SAG mill adopts a self return device to realize the discharge of the mill. Ball mill:There are many types of ball mills, mainly including overflow ball mills and grate ball mills. Rod mill:The rod mill does not use grid plates to discharge ore. There are only two types: overflow type and open mouth type. The diameter of the hollow shaft at the discharge end is generally larger than that of a ball mill of the same specification.
There are so many differences between ball mills, rod mills and SAG mills. How should we choose in specific applications? According to Raw Materials Different mills should be selected for different raw materials. According to the size of finished products Rod mill:When the particle size of the product is 1 3mm, the processing capacity of the rod mill is greater than that of a ball mill of the same specification. Ball mill:When the particle size of the product is less than 0.5mm, the grinding effect of the ball mill is greater than that of a rod mill of the same specification. SAG mill:The SAG mill has a wide range of feeding particle sizes and can process larger minerals, but at the same time, its output particle size is relatively larger. According to the Grinding Stage According to the Mode of Production Rod mill:In order to prevent the damage caused by overcrushing, the rod mill is often used for production and processing before gravity concentration or magnetic separation plant....
The difference in structure. 1. Dry type. 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. 2. Wet type. The structure of the ball mill is simple.
The ball mill adopts a discharge screen similar to the ball mill, and the function of blocking the internal medium of the overflow ball mill is accomplished inside the rotary part of the ball mill. The discharge screen is only responsible for forcing out a small amount of the medium that overflows into the discharge screen through the internal welding reverse spiral, to achieve forced discharge mill.
The grinding media of ball mill is steel ball, but it of rod mill is steel rod. Ball Mill Parameter Selection Power, Rotate Speed, Steel Ball
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Compared with the ball mill, the rod mill adopts advanced controllable feeding and discharging technology, and can use the appropriate grinding body according to the grinding material. The point contact of the traditional ball mill can be changed into line contact, which can make the discharge granularity more uniform and the output is higher. The rod mill is mainly used for gravity separation or magnetic separationof tungsten tin ore and other rare metal ores, because the use of a rod mill can prevent the occurrence of dust pollution caused by excessive pulverization and improve the recovery rate of the sorting operation. How Much the Gold Ore Ball Mill? The ball mill is suitable for grinding various ores and other materials, including mineral processing, building materials and chemical industries. The feed both can be dry and wet.
The finesse of the material milled by the ball mill is 0.074mm 0.4mm, only except for the two small ball mills that have a wider range of 0.075 0.89mm. However, the rod mill fine grinding fineness is about 0.833 0.147mm. In terms of the fineness of the ground material, the ball mill has a finer handling ability. Can the Ball Mill Grind the Material to 325 Mesh? On the other hand, the surface area of the steel rod medium in the rod mill is smaller than that of the steel ball medium in the ball mill, so the utilization factor is lower than that of the ball mill of the same processing capacity. Rod mills are often used in coarse grindingoperations and are not suitable for fine crushing. Buti in some cases, the rod mill can replace the fine crusher and solve the problem that the discharge port of the fine crusher is easy to block.
The rod mill adopts overflow type and open type discharge, does not use grate type discharge. The diameter of the rod mill discharge end is larger than that of the same size ball mill. When the rod mill speed is lower than the working speed of the same size ball mill, the medium in the rod mill is in a sloping working state. For the ball mill, depending on the specific requirements, you can choose the overflow type and grate type of discharge method. 5 Ways to Control the Ball Mill Noise Thats my great honor if the above comparison between the ball mill and the rod mill can help you to choose the equipment that suits your production needs. In summary, if you have high requirements on the fineness of the material, it is recommended that you choose a ball mill for processing. Because it uses a steel ball to grind more thoroughly, more contact areas, will make the fineness of the finished product higher. How to select a ball mill? we are here to help.