How to Select Suitable Ore Grinding Mill?

About Processing Capacity of Rod Mill and Ball Mill

Grinding mill is mainly applied to grinding the stone or ore into powder type. In the grinding process, the grinding media, the rod, meet with the stone or ore in a line type.

The processing capacity of rod mill and ball mill are mainly refers to the following factors: the grind-ability of ore, feeding size and final product particle size, model and dimension of grinding mill, rotation speed of grinding mill, filling ratio of the grinding media, grinding density, type of classifier and the working system.

Processing capacity of rod mill and ball mill are worked out by volume method and energy consumption method.

Then, how to select the suitable ore grinding mill?
Generally speaking,
1.    Rod mill are good at coarse grinding, the final product particle size are mainly 1-3mm, and 0.5mm in the gravity concentration plant. if it is too fine, the grinding effect will decline obviously. The diameter of rod mill is usually smaller than 4500mm, and the length of rods shall be smaller than 6000mm. When the rod mill and ball mill work together, the ratio shall be 1:2.
2.    Grate ball mill are also mainly used for coarse grinding. It is applied in the primary grinding or the first stage of the two stage grinding. In the closed circuit, the grinding fineness are  50%～70%－0.074mm. It usually matches with spiral classifier.
3.    Overflow ball mill can be used in both the one stage grinding and the two-stage grinding process or the re-grinding of the semi-finished product. In the two-stage grinding process, it usually matches with the hydro-cyclone; while in the one stage grinding process, it usually matches with spiral classifier. The big ball mill whose diameter is bigger than 4000mm are usually adopts the return circuit composed by overflow ball mill and hydro-cyclone. Than not only simplify the structure of grinding mill but also be convenient for maintenance.
 
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