Overflow ball mill

Overflow Ball Mill

Applications: Overflow ball mill is mainly used in mineral processing, metallurgy, chemical industry, building materials, silicate, fire resistance, power, cement and other industries.

Overflow Ball Mill Details

Overflow ball mill is a kind of ball grinding mill which works in wet water state. It belongs to a type of wet ball mill and is a very common grinding equipment in the concentrator. Ball grinding mills are classified according to the discharge methods and can be divided into overflow ball mill and grate ball mill. Unlike the grate ball mill, the overflow type ball mill has a simple structure, and the discharge method is based on the gravity flow of the slurry to discharge the ore.

The product size of the overflow discharge ball mill is generally less than 0.2mm, which is suitable for concentrate re-grinding operation and can be used as one-stage grinding or two-stage grinding operation to obtain fine qualified products.

Overflow type ball mill
Overflow type ball mill
Overflow discharge ball mill
Overflow discharge ball mill

The slow transmission system is added to the wet overflow ball mill. When the ball mill is started, the low-speed slow-speed transmission system operates first, and the high-speed main motor transmission system operates later. This not only saves energy consumption but also reduces the impact on the overflow type ball mill barrel and power grid system.

Working Principle Of Overflow Ball Mill

The main part of the overflow discharge ball mill is a barrel with a smaller diameter and larger length, which is supported by rolling bearing and rotates slowly by transmission mechanism. The material is fed from the feeding end of the barrel, and the material is crushed in the barrel due to the impact of the steel ball and the ore itself.

The diameter of the hollow shaft at the discharge end of the wet overflow ball mill is slightly larger than that at the feed end, resulting in a certain inclination angle of the pulp in the mill towards the discharge end. Due to the continuous feeding of materials, the pressure makes the materials in the barrel move from the feeding end to the discharging end.

When the height of the slurry surface is higher than the lowest generatrix of the inner diameter of the discharge port, the slurry overflows out of the overflow discharge ball mill. This is a non forced high-level ore discharge with sufficient grinding and good grinding effect. The hollow shaft at the discharge end of the overflow type ball mill has reverse spiral blades, which can return the overflowing steel balls and coarse ore blocks to the mill.

Working principle of overflow ball mill
1-Barrel 2,3-End cover 4-Main bearing 5-Liners 6-Pinion 7-Rack wheel 8-Feeding end 9-Tapered bushing 10-Bearing bush 11-Manhole

Product Advantages of Overflow Ball Mill

  1. High wear resistance: The barrel the overflow ball mill is welded by using steel plates with a thickness of 15-36mm. The flanges made of cast steel are welded on both ends of the barrel, and the end cover and the flange are connected together with a bolt. Its precision machining and coordination greatly improve the wear resistance of the components.
  2. Automation control: Overflow type ball mill can use different ball mill liner types according to production needs and set the fineness of the grinding material. The overflow type ball mill can control the grinding time by itself and fully realize the automatic control.
  3. Advanced component performance: The overflow discharge ball mill has a short stopping time during the working process, and the machine vibration is small during operation, so the equipment has a long working life. The overflow discharge ball mill has low labor intensity, which can save more manpower for customers.

Technical Data

Specification(mm)Capacity(t/h)Output Size(mm)Rotate Speed(r/min)Grinding Media Load(t)Motor Power(kW)Weight(t)
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