Similarities
1, the structure is basically the same
The structure of the two ball mills is basically the same, mainly consisting of the cylinder part, the ore supply part, the mine discharge part, the bearing part, the transmission part and the lubrication system.
2, the workflow is similar
During the work, after the ore is sent to the cylinder, the cylinder will rotate around the horizontal axis according to the specified speed. At the same time, the ore will be freely plunged or thrown by the centrifugal force and the friction of the grinding medium, thus being impacted and It is pulverized by grinding and stripping, and the products after grinding are discharged through the mine discharge department.
the difference
1. Structure of the mine discharge department (name source)
The basic structure of the two is the same as the milling process, but the structure of the mining department is different.
The grid side of the grid type ball mill is equipped with a lattice liner (this is also why it is named a lattice type ball mill). There is one grid plate at the discharge end, and there are many discharge holes on the grid plate. The milled pulp passes through the lattice liner and is raised to a level higher than the discharge port through the fan-shaped chamber leading to the discharge port, so that the slurry is discharged from the mill.
The grate plate is not installed on the discharge side of the overflow ball mill, but on the inner surface of the hollow journal bushing at the discharge end, a spiral blade with a spiral direction and a rotating direction of the mill is arranged to prevent the water ball or the coarse material. The ore mass is discharged together with the slurry, and the overflow of the overflow ball mill is self-flowing by the slurry itself above the lower edge of the hollow journal bushing (this is also why it is named an overflow ball mill).
2, the discharge granularity (application range)
The upper limit of the particle size of the grating type ball mill grinding product is generally 0.2 to 0.3 mm, so it is often used in the first stage of grinding, and often forms a closed circuit cycle with the spiral classifier.
The size of the overflow ball mill grinding product is generally less than 0.2mm, which is suitable for the re-grinding operation of concentrates, and can obtain finer qualified products.
3, discharging method
The lattice type ball mill discharges through the sieve plate, and the material of the overflow ball mill is automatically overflowed, and when the material level is higher than the discharge port, the material is automatically discharged.
4, production capacity
The working characteristics of the lattice type ball mill are mainly forced discharge and high production capacity. The mill is placed in the first stage of grinding operation, which can obtain higher processing capacity, but the product size is coarser than that of the overflow ball mill.
5, grinding effect
The steel ball inside the lattice ball mill is large and small, and when the steel ball is lifted to a certain height, the ball has a relatively large drop height. Therefore, the impact of the steel ball on the material is strong. The crushing effect of the mineral material is large and the grinding effect is better.
6, over-grinding phenomenon
The lattice plate and the fan-shaped indoor lifting bucket of the lattice ball mill realize a low level of forced discharge. The finely ground ore particles stay in the ball mill for a short time and are discharged in time to reduce the over-grinding phenomenon of the gravel.
The overflow ball mill belongs to the unforced high level discharge, the discharge speed is slow, and the mineral material stays in the machine for a long time, so the over-grinding phenomenon is serious.
7, maintenance difficulty
In contrast, the overflow ball mill has a simple structure and convenient maintenance, and the structure of the lattice ball mill discharge makes it easy to block the grid plate during work, and the maintenance is complicated.
summary
In summary, we can draw the following conclusions:
Lattice ball mill
Advantages: fast discharge rate, can reduce the over-grinding of gravel, and increase the output per unit volume, which is higher than the output of the overflow ball mill;
Disadvantages: The structure is complicated, it is easy to block the grid plate when discharging, and the maintenance is difficult and complicated, and the operation rate is relatively low.
Overflow ball mill
Advantages: simple structure and convenient maintenance. Because the discharge pipe is cast with reverse thread, large ore and steel ball are not easy to be discharged outside the machine;
Disadvantages: The production capacity per unit volume is low, and it is easy to produce excessive pulverization.
Both ball mills have their own characteristics in terms of use and performance. Users need to specify their own production requirements, rough or fine grinding, and the amount of production required, in order to choose the most suitable type of ball mill.
Because the mixing barrel moves in multi directions, there is no centrifugal force acting on the materials as well as no phenomena of gravity segregation, lamination and accumulation of materials so that the mixing rate can be up to 99.9%. the barrel has high loading rate, so that it features high efficient and short mixing time. the barrel transitional radius everywhere, conform to GMP.
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