First. Type of ball mill
The ball mill can be divided into a ball mill, a rod mill, and a gravel mill according to the medium-shape of loading. It can be divided into the end type grinding mill, central discharge mill mill according to the unloading way. It can be divided into the center transmission ball mill, edge transmission ball mill according to the transmission mode. According to the operation of the process, it can be divided into dry type grinding mill, wet type grinding mill, intermittent mill, continuous mill. According to the different using fields, it can be divided into mineral processing ball mill, cement ball mill, coal mill, pottery ball mill, laboratory ball mill.
Two. Selection of rod mill and ball mill
1. Rod mill
The characteristic of rod mill is the line contact between the grinding medium and mineral ore in the process of ore grinding, thus it has certain selective grinding effect, with a uniform particle size, less over-crushing particles. When used for coarse grinding and the product grain size is 1-3mm, and the processing capacity of the rod mill is greater than the ball mill of the same size. When used for fine grinding and the product grain size is less than 0.5mm, the grinding effect is not as good as the same size of the ball mill. The feed size of the rod mill is generally 15-25m. when the diameter of the rod mill is greater than 2400mm, the feed size of the ore can up to 40 50mm, and the product size of the rod mill can reach 1-3mm.
2. Ball mill
There are two kinds of ball mill used in mineral processing plant: lattice type and overflow type. Lattice type include the short tube type and long tube type two kinds. Usually short tube type is used for coarse grinding, and the long tube type is used for fine grinding.
Overflow type ball mill mainly has the advantages of simple structure, good management, easy maintenance, grinding ore products with fine granularity (generally less than 0.2mm), while has the disadvantages of high discharging level, long time residence of pulp in the mill, low capacity volume for per unit, uneven discharge granularity, over crushing.
The overflow type ball mill can be used for one section grinding, which also can be used for the second section grinding or intermediate products regrinding.
The lattice type ball milll is provided with a grid plate. The advantages is the pulp level relatively low, which can discharge the qualified products in time, reduce the over crushing of ore, with high grinding efficiency, 15% higher than the overflow type ball mill with the same specifications for the unit volume. The ball load is high. The disadvantages have the complex structure, easy broken grid plate, difficult maintenance, large weight, and high equipment price.
The product granularity of the lattice type ball mill can reach 0.2-0.3mm, therefore it can be used for the first section ore grinding, which can be formed the closed cricuit with the sprial classifier.
Henan Zhengzhou Mining Machinery Co., Limited can provide the different type ball mills. For the further quriries, please kindly view the website the http://www.hnzkjq.com/.
