Cement mills are the milling machines used in cement plants to grind hard clinker into fine cement powders. Cement ball mill and vertical roller mill are two most widely used cement mills in today’s cement grinding plants and are also the main types of cement mill we produce.
As a professional cement equipment manufacturer, AGICO has rich experience in the designing and manufacturing of cement ball mills and vertical roller mills. Our cement mills have extraordinary performance in the cement grinding process of the new dry process cement plants.
Cement Ball Mill
The cement ball mill is mainly composed of a horizontal cylindrical shell, feeding & discharging hollow shafts, liner plates, and grinding media. The mill body is a long cylinder, with many grinding balls inside. The cylinder is made of steel plate, and the inner part of the cylinder is fixed with steel lining plate; the grinding balls are steel balls with different diameters, which are installed into the cylinder in a certain proportion. There are also ball mills that use steel segments instead of steel balls as grinding media.
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Cement Ball Mill Working Principle
There are two chambers in the cement ball mill. When the ball mill is operating, the clinker is fed into the first chamber in the cylinder body through the hollow shaft at the feeding end of the mill. When the cylinder rotates, the grinding balls, under the action of inertia, centrifugal force, and friction force, clings to the lining plate inside the cylinder and rotates with it. When they are brought to a certain height by the lining plate, they will be thrown down due to gravity, and the clinker in the cylinder will be smashed.
After coarse grinding in the first chamber, the clinker enters the second chamber through the single-layer partition board. The second chamber is inlaid with a flat-lining plate and steel balls, which further grind the material into cement powders. The powders are finally discharged through the discharge grate plate, and the cement grinding operation is completed.
Cement Ball Mill Features
- AGICO ball mills have large continuous production capacity, can meet the requirements of large-scale industrial cement production.
- The grinding ratio of ball mills can reach more than 300, and the fineness of the grinding product can be easily adjusted with them.
- AGICO cement ball mills have simple but firm mechanical structures, they are easy to operate and maintain.
- The investment cost to build a ball mill is cheaper than a vertical roller mill of the same capacity.
Cement Ball Mill Specifications
|Spec||Capacity （t/h）||Rotate speed (r/min)||Grinding body||Motor||Reducer||Weight (t)||Size (m)|
|Model||Power (kw)||Model||Power (kw)|
Vertical Roller Mill
Vertical roller mills (VRM) are a type of mainstream clinker grinding equipment in the cement manufacturing process. Vertical roller mills are still newish cement mills since their history in cement production is no more than 20 years, but they have already become the standard cement equipment in many regions and are getting more and more popular among cement producers.
The main component parts of a vertical roller mill (VRM) include a driving motor, a separator, a hydraulic pressure system, a swinging arm, a grinding table, and several rollers.
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Vertical Roller Mill Working Principle
When the vertical mill works, the motor drives the grinding disc to rotate, and the grinding roller rotates around the grinding roller shaft driven by the disc. The material entering from the feeding port falls in the center of the grinding disc and moves towards its edge under the action of centrifugal force. When the material passes through the grinding track, it is meshed between the roller and the disc and crushed by them. After grinding, the material continues to move towards the edge of the disc until it overflows. An air duct ring is installed around the grinding disc, from which the hot air flows out at high speed from bottom to top, and carries the spilled materials. The material with large particles will fall back to the grinding disc, and the material with small particles will be brought into the powder concentrator for coarse and fine classification. The coarse powder falls back to the grinding disc for regrinding, and the fine powder meeting the requirements is sent out as the finished product, which is collected by the dust collector at the upper outlet along with the airflow.
Vertical Roller Mill Features
- Due to the high air velocity and the heat transfer rate of airflows at the air duct ring, small particles in the material can be dried instantly.
- The vertical roller mill itself is equipped with a powder concentrator, which can remove fine powder in time, reduce the phenomenon of over-grinding and improve the grinding efficiency.
- The vertical roller mill is less power consuming. The energy consumption of a vertical roller mill is around 75% of that of a ball mill of the same capacity.
- Vertical roller mills can be transported in parts and constructed onsite, avoiding difficult logistical issues and associated costs.
- The fineness of product cement can be adjusted easily with the vertical roller mill.
- The parts of the vertical roller mill have low wear rate.
- Vertical roller mills generate less noise than ball mills.
- Vertical roller mills usually have small floor area and building space.
Vertical Roller Mill Specifications
|Model||Grinding disc diameter(mm)||Roller diameter(mm)||Feeding size(mm)||Production capacity(t/h)||Main motor power(Kw)||Disc rotation speed (r/min)||Weight (t)|
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