Ore Ball Mill Equipment Selection

The handling capacity of ball mills and rod mills is dependent on the grinding ability of the ore, the size of the ore and the final product, the type and size of the mine grinder, the shape and size of the liner, the shape of the grinding medium, size, matching ratio and its physical and mechanical properties, mill speed media filling rate and pulp filling rate, grinding concentration, grading machine type and its working system. Because there are many factors that affect the processing ability of the mill, and have great changes, there is not a precise formula to calculate the processing capacity of the mill. In the dressing plant design, grinding machine processing capacity is generally based on experiments to determine. Ball mill, rod mill processing capacity calculate commonly used volume method or power law.
Ore ball mill equipments selection should meet the following requirements:
1. Rod mill is used for coarse grinding, grinding products, mostly 1 ~ 3mm particle size, gravity mill can be 0.5mm. Fine grain size, grinding efficiency decreased significantly. As a result of the movement of the grinding rod in the mill, the diameter of the rod mill should not be larger than ф4500 mm in general and the length of the grinding rod should not be larger than 6000 mm. Rod mill and ball mill joint operation and ratio should be 1: 2.
2. Lattice ball mill is used for coarse grinding, generally used for single-stage grinding or grinding of the first paragraph of two sections of grinding. Closed-circuit operation, grinding fineness is generally 50% ~ 70% -0.074mm. Ore ball mill equipped with multi-screw spiral classifier.
3. Overflow type ball mill can be used for a period of grinding, grinding can also be used for the second paragraph or intermediate product grinding. Currently used for the second paragraph or intermediate products and then grinding operations, grading equipment generally equipped with hydrocyclones. Mill used for grinding the first paragraph, sometimes with spiral classifier. Large ball mill (generally greater than ф4000mm), more usage of overflow ball mill and hydrocyclone grinding circuit, not only simplifies the mill structure, but also easy to maintain.
4. Automatic mill, semi-self -mill and gravel ball mill selection, special attention should be paid to whether the mine has a good self-grinding media, self-grinding media analyzer can be used to measure the mineral self-polishing media index, and data processing to determine whether there is a good self-abrasive media, to determine whether the need for self-grinding, semi-self-grinding and gravel grinding semi-industrial test. Semi-industrial test using empirical formula for self-mill, semi-self-mill and pebble mill type calculation.