GRATE DISCHARGE BALL MILL
The grate discharge ball mill is also called grate ball mill. It is often used in the first stage of two-stage grinding to dry or wet grind various ores and other grindable materials. Compared with overflow ball mill, grate ball mill is a type of ball mill grinder that can realize forced ore discharging by grid lining plate and fan-shaped chamber. Besides, it has a larger capacity, less over-grinding phenomenon, low operation noise, and high working efficiency.
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GRATE DISCHARGE BALL MILL STRUCTURE
When the grate ball mill rotates slowly through the transmission device, materials enter from the feeding end. The ball mill cylinder is equipped with steel balls and wear-resistant lining plates. The lining plate brings steel balls and materials to a certain height with continuous rotation. When they fall, the mutual impact completes the grinding process. During the grinding, materials move towards the discharge end. The finely ground particles enter the fan-shaped chamber through the discharge hole on the grid plate and then they are lifted to a certain height with the rotation. After that, they get into the quill shaft neck to be discharged from the grate ball mill. Those coarse particles that are cut off by the grid plate are continuously ground inside the cylinder.
When the ball mill rotates uniformly around the horizontal axis, raw materials enter the cylinder through the quill shaft from the feeding device and then rise to a certain height with steel balls under the combined action of centrifugal force and lining plate friction. After a while, they fall along the parabola under the action of self-weight and collide with each other to achieve the grinding purpose. Due to continuous feeding, the pressure causes materials in the cylinder to move from the feeding end to the discharging end. And the quill shaft diameter at the discharge end is slightly larger than that at the feed end so the material slurry in the mill has a certain inclination. When the height of the slurry surface is higher than the discharge port, they will overflow out of the mill. The quill shaft is equipped with reverse spiral blades, which can return the overflow steel balls and coarse material blocks to the ball mill.
HIGHLIGHTS OF GRATE DISCHARGE BALL MILL
|Model||Dimension(m)||Volume(m³)||Ball Load(t)||Rotation Speed(r/min)||Power(kw)||Discharge Size(mm)||Capacity (t/h)||Weight(t)|
OVERFLOW DISCHARGE VS GRATE DISCHARGE
The grate discharge ball mill and overflow ball mill have a similar structure and working procedure. However, they are quite different in discharge way, discharge size, etc.