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Feeding Size: ≤20-≤25 mm
Discharging Size: 0.074-3.0 mm
Capacity: 2.6-400 t/h
Ball Load: 8.4-131 t
Material: cement, silicate products, fertilizers, ores, and other materials.

Overflow ball mill is also called overflow type ball mill. It is a kind of wet ball mill grinder, frequently used in the material refine grinding (finished material is lower than 0.2mm) or the second stage grinding. Overflow ball mills adopt the overflow principle to discharge the qualified material slurry higher than the discharge port naturally. Because the overflow ball mill is cylindrical, it can be divided into the short type and long type according to the cylinder length, but they have no difference in structure and working principle. Overflow ball mills feature high grinding precision, strong production capacity, and high comprehensive utilization rate, which can be widely used in the cement industry, silicate product industry, refractory material industry, fertilizer industry, black and non-ferrous metal mineral processing, etc.

AGICO energy-saving overflow ball mills adopt bearing support structures, which can save 10-20% energy compared with traditional bearing bush structures, with low failure rate, less maintenance, convenient lubrication and maintenance. Besides, our ball mills are also equipped with a low-speed transmission system. When it starts working, the low-speed transmission system runs first and the high-speed main motor transmission system runs later. It not only saves energy consumption but also reduces the impact on ball mill equipment and power system.

overflow ball mill on site
Overflow Ball Mill On Site


Smelting Industry: used to grind various kinds of slag, such as blast furnace slag, steel slag, ferroalloy slag, etc.
Mining Industry: used to grind various kinds of ores, such as iron ore, copper ore, gold ore, quartz ore, etc.,
Cement Industry: used to grind cement raw materials and cement clinker.
Chemical Industry: used to grind coke, ilmenite, and others.
Power Generation: used to grind coal for combustion use.


The overflow ball mill is composed of cylinder, end cover, main bearing, quill shaft, transmission device, feeding device, manhole, pinion device, lining plate, etc.

Lining plates are laid inside the cylinder and end covers. There are 1-2 manholes on the cylinder for maintenance and replacement of the lining plate.
Overflow ball mill cylinder is welded by steel plate with a thickness of 15-36mm. Flange plates made of cast steel are welded at both ends of 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.

overflow ball mill structure
Overflow Ball Mill Structure


High Automation. Our ball mills are controlled by PLC, with automatic sound and light alarm, fault diagnosis, and other functions, realizing the integration of mechanical, electrical, and hydraulic control.
Low Energy Consumption. AGICO overflow ball mills feature low starting current and short starting time. The power consumption of normal operation is 20% – 30% lower than that of other ball mills.
High Quality & Small Maintenance. The quill shaft is made of steel casting, the rotary gear is processed by casting hobbing, and the cylinder is inlaid with wear-resistant lining plates.
Low Cost. Our overflow ball mills have a reasonable price, less auxiliary equipment, and a simple material feeding device.
Steady Running. The use of hydrostatic and hydrodynamic bearing makes the operation stable and reliable.


ModelDimension(m)Volume(m³)Ball Load(t)Rotation Speed(r/min)Power(kw)Discharge Size(mm)Capacity (t/h)Weight(t)
AG1535φ 1.5×3.54.61027.675-900.074-0.83.0-13.216
AG1830φ 1.8×3.06.51225.3110-1320.074-0.84.5-2027.8
AG1835φ 1.8×3.57.581525.3132-1600.074-0.85.0-2329.7
AG1840φ 1.8×4.08.651625.3160-1850.074-0.86.0-2532.6
AG1845φ 1.8×4.59.751825.3185-2100.074-0.86.8-2835.5
AG2122φ 2.1×2.26.714.723.81600.074-0.85.0-2242.9
AG2130φ 2.1×3.09.21723.81850.074-0.85.8-2546.5
AG2136φ 2.1×3.6111923.82100.074-0.86.0-2848
AG2140φ 2.1×
AG2145φ 2.1×4.513.82223.82500.074-0.88.0-3451.3
AG2424φ 2.4×2.49.818.822.82100.074-0.86.2-3054
AG2430φ 2.4×3.012.22322.82500.074-0.86.6-3457
AG2436φ 2.4×3.614.62522.82800.074-0.87.9-40.559.68
AG2440φ 2.4×4.016.22822.83150.074-0.88.7-4562.9
AG2445φ 2.4×4.518.23122.83550.074-0.89.8-5065.5
AG2721φ 2.7×2.110.72021.72800.074-3.06.0-7663.5
AG2727φ 2.7×2.713.825.521.73150.074-3.07.8-9866.7
AG2730φ 2.7×3.015.32821.73550.074-3.08.8-10875.6
AG2736φ 2.7×3.618.43421.7355-4000.074-3.010.5-13081.8
AG2740φ 2.7×4.020.53721.7400-4500.074-3.011.5-14483.58
AG2745φ 2.7×4.52342.521.75000.074-3.013-18087.6
AG3231φ 3.2×3.122.6522.6518.64500.074-3.014.4-164127
AG3236φ 3.2×3.626.226.218.65000.074-3.017.1-171131
AG3240φ 3.2×
AG3245φ 3.2×4.532.86118.66300.074-3.022-228139
AG3254φ 3.2×5.439.27318,67100.074-3.026-270148.7
AG3640φ 3.6×4.035.66717.37100.074-3.020-210165
AG3645φ 3.6×4.540.87617.3800-10000.074-3.026-233170
AG3650φ 3.6×5.045.38617.311200.074-3.031.5-260180
AG3660φ 3.6×6.054.410217.312500.074-3.034-280200
AG3685φ 3.6×8.57913117.315000.074-3.045-400240


Material Discharge

Grate discharge ball mill: the discharge end is equipped with grid plates. The material slurry is lifted to a height higher than the discharge port through the grid plate and fan-shaped chamber to realize material discharging.
Overflow ball mill: there is no grid plate at the discharge end. When the height of the slurry surface is higher than the discharge port, they will overflow out of the mill.

Discharge Size

Grate discharge ball mill: the discharge size is 0.2 ~ 0.3mm so it is commonly used in the first stage grinding.
Overflow ball mill: the discharge size is smaller than 0.2mm so it is suitable for the second stage fine grinding.

Operation Feature

Grate discharge ball mill: high output, but complex maintenance as the grid plate is easy to block.
Overflow ball mill: relatively low output, but fine discharge size, simple structure, and convenient maintenance.
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