### Whats the Difference Between Ball Mill, Rod Mill and SAG ...

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.

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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.

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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.

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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:

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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.

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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....

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