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Raw Material Ball Mill

Application Cement Plant, Thermal Power Plant, Steel Mill, Mining
Capacity 21-210 t/h
Motor Power 475-3550 kW
Fineness 3300~3800 cm²/g

Overview

This ball mill is mainly used for grinding raw materials and final products in cement plant. It can be replaced by vertical raw mill. It is also suitable for grinding various ores and other materials in the metallurgy, mine, chemical, construction and other industries. Besides, the raw mill has two forms of milling, one is an open form, and the other is a recycle close form equipped with powder concentrator. It is widely applied to many industries and has convenient operation.

Features
1. Strong adaptability to raw material
2. Continuous production
3. Large crushing ratio
4. Easy to adjust the size of the products
5. High wear resistance, impact resistant
6. More convenient operation
7. High gear bending strength
8. Good lubrication, reliable operation

Ball Mill Working Principle

Center drive and side drive are two common drive modes for a ball mill. Center drive grinding mill means the motor shaft extends along the axis of mill body while side drive has a motor located on the side of the mill and torque is transmitted via the girth gear which is bolted on the flange of the mill body.

Materials are fed into the mill at a fixed flow rate along the shaft-less screw of the screw conveyor. Once inside the first compartment of the drum, the motor is activated and rotates the drum via a gearbox.

As rotation continues, steel balls inside the drum compartment are lifted up as high as centrifugal force and friction take them before falling back down on the materials.

During this process, a large crushing force acts on the materials, grinding them to finer sizes. The finely ground particles move out of the drum via a classifier. Coarse particles are returned to the mill for further grinding, which forms a so-called closed circuit.

Structure
1. Classifying liners are used to keep larger steel balls at the feed end for breaking large particles, and retain smaller steel balls at the discharge end for fine grinding. This grinding method improves efficiency.
2. True to its name, these wear-resistant liners resist severe wear.
3. Double slide shoe bearings are used to prevent the discharge end from overheating, thus ensuring operational stability and continuity.
4. Simple structure allows for ease of operation. Great adaptability enables the grinder to produce any fineness of particles in a short time.
5. Advanced diaphragm is used as a partition wall between two drum compartments. Unique grating system at the discharge end ensures only the finely ground particles can leave the drum.
6. Rubber gaskets and sealing adhesive are applied to the in-between area of slide shoe bearing housing and bearing pedestal. Strengthened seal makes certain there is oil leakage during use.

Specifications

Model (m) Output (t/h) Rotate Speed (r/min) Feeding Granularity (mm) Grinding Media Load (t) Effective Volume (m³) Motor (kW) Weight (t)
Φ2.4×7.5 21-23 20.4 ≤25 37.5 29.5 475 76
Φ2.4×10 30 20.4 ≤25 50 39 570 94
Φ2.6×8 20-24 19.57 ≤25 52 38.1 630 97
Φ2.6×9
(closed-circuit)
42 19.57 ≤25 58 42.7 710 125
Φ3.0×9 28-32 18.3 ≤25 78 57.4 1000 150
Φ3.4×7.5 60 16.9 ≤25 80 58 1000 167
Φ3.8×7.5 90 17 ≤25 95 91.8 1600 218
(excluding motor)
Φ4.0×9 120-140 16 ≤25 140 106 1800 269
Φ4.6×10+3.5 190 15 ≤25 190 177 3550 352
(excluding driving parts)
Φ4.6×10.5+3.5 210 15 ≤25 200 185 3550 358
(excluding driving parts)
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