Cement Ball Mill

Product Overview

The cement ball mill is key equipment used in cement production lines for grinding clinker, admixtures, slag, and other materials. It is widely applied in the finish grinding and raw material grinding of cement plants, and is also suitable for grinding various ores and other grindable materials in metallurgical, chemical, electric power, and other industries. Our cement ball mills are manufactured with advanced processes and feature high grinding efficiency, stable operation, low energy consumption, and easy maintenance. They are an ideal choice for new cement production lines and also suitable for upgrading existing lines.

1. Product Description

The cement ball mill is a horizontally rotating cylindrical device, mainly composed of the feeding part, discharging part, rotary part, transmission part (reducer, small transmission gear, motor, electric control), and other components. The two ends of the cylinder are provided with hollow shafts supported on sliding bearings. Inside the cylinder, diaphragm plates divide the mill into 2 to 4 compartments, which are filled with steel balls or steel segments as grinding media. Material enters the first compartment through the feeding device via the feeding hollow shaft screw, where coarse grinding takes place. Then it passes through the diaphragm plate into the next compartment for fine grinding. The powdered product is discharged through the discharge grate plate, completing the grinding process. The cement ball mill can perform dry grinding, wet grinding, or simultaneous grinding and drying.

2. Equipment Classification & Features

(1) Ordinary Cement Ball Mill

Mainly used in closed-circuit grinding systems (in combination with an air separator). It is characterized by high grinding efficiency, large output, and low power consumption. Compared with conventional grinding systems, output can be increased by 15–20%, power consumption reduced by about 10%, and product temperature lowered by 20–40°C. Product fineness is easy to adjust, making it especially suitable for grinding slag cement.

(2) High-Fineness High-Output Cement Ball Mill

Mainly used in open-circuit grinding systems. The system and process flow are simple, requiring lower investment and less floor space. The mill structure adopts a special internal powder-selecting diaphragm device, and the fine grinding compartment is equipped with an activation device. A special discharge grate plate is installed at the mill outlet, which minimizes the size of grinding media in the fine grinding compartment, significantly improving grinding efficiency to achieve high output and low energy consumption.

(3) Raw Mill

Used for grinding raw materials in cement plants. Edge drive is usually adopted. The motor drives the cylinder to rotate via a reducer. Under centrifugal force, the material is lifted to a certain height and then cascaded down in a curtain, where it is crushed and ground by the steel balls.

3. Technical Parameters of Cement Ball Mill

Our company produces a full range of cement ball mills from Φ1.2m to Φ4.2m, with single-machine capacity ranging from 1.4 to 87 t/h and motor power from 55 to 3520 kW. Detailed technical parameters for each specification are provided below for customer reference.

Table 1: Technical Parameters of Small & Medium Cement Ball Mills

Notes:

• “Open circuit” means the material passes through the mill once to become finished product. “Closed circuit” works with an air separator: unqualified material returns to the mill for regrinding.
• The above parameters are standard reference values. Actual performance may vary depending on feed size, material properties, moisture content, and process configuration.

Table 2: Technical Parameters of Large Cement Ball Mills

Note: For the Φ3.2×13m model: equipped with roller press, closed circuit, ordinary Portland cement; feed size ≤2-3mm, moisture ≤0.5%, specific surface area ≥320㎡/㎏.

4. Working Principle

When the cement ball mill operates, the motor drives the cylinder to rotate via a reducer. The grinding media (steel balls) rotate together with the cylinder. Under centrifugal force and friction, they are lifted to a certain height and then fall in a cascading or cataracting manner. During falling, the grinding media impact and grind the material, crushing and pulverizing it.

The grinding process follows these steps:

• Step 1: Material enters the first compartment (coarse grinding compartment) through the feeding device via the feeding hollow shaft screw. This compartment is lined with step liners or corrugated liners and contains large-diameter steel balls, which break large pieces by impact.
• Step 2: The coarsely ground material passes through a single-layer diaphragm plate into the second compartment (fine grinding compartment). This compartment is lined with flat or corrugated liners and contains smaller steel balls for fine grinding.
• Step 3: The finished powder is discharged through the discharge grate plate. The material flows from the feed end to the discharge end by gravity due to the material level difference, without needing additional conveying devices.

5. Structural Composition

The cement ball mill mainly consists of six major systems:

6. Key Advantages

✅ High Output & Efficiency

Mill output can be increased by 15–20%, power consumption reduced by about 10%, and product temperature lowered by 20–40°C. Suitable for both open-circuit and closed-circuit grinding processes, optional according to customer needs.

✅ Stable & Reliable Operation

Double sliding shoe structure solves the problem of excessive temperature at the discharge end sliding shoe bearing that prevented continuous operation. The mill can run continuously for long periods.

✅ Excellent Product Quality

Finished product specific surface area can reach 330–380 m²/kg, featuring high fineness, large specific surface area, fast hydration reaction, and rapid strength development.

✅ Strong Adaptability

Suitable for various materials such as cement clinker, slag, coal gangue, limestone, etc., and can meet different process requirements including dry, wet, and simultaneous drying-grinding.

✅ Wear-Resistant & Durable

The internal lining uses high-quality wear-resistant materials with high strength, long service life, low vibration, and low noise, meeting environmental protection requirements for clean production.

✅ Low Investment & Easy Maintenance

The system and process flow are simple, resulting in low investment cost and small plant area. Easy to operate, with minimal inspection and maintenance workload.

7. Applications

The cement ball mill is widely used in:

• Cement industry: Grinding of cement clinker, raw meal preparation, slag grinding, fly ash processing.
• Building materials industry: Grinding of new building materials, refractory materials, glass, ceramics, etc.
• Metallurgical industry: Crushing and grinding of ferrous and non-ferrous ores before beneficiation.
• Chemical industry: Fine grinding of various chemical raw materials.
• Electric power industry: Limestone grinding for desulfurization, fly ash reprocessing.

The equipment can be used for open-circuit grinding or closed-circuit grinding with an air separator, and supports both dry and wet processes, offering flexible configuration according to process requirements.

8. Selection Guide

Key factors to consider when selecting a model:

9. On-Site Installations

Our cement ball mills have been successfully put into operation in many cement plants and grinding stations both at home and abroad. Jiangsu Pengfei Group’s Φ4.6×13m intermediate discharge mill and Φ4.2×13m high-efficiency ball mill operate stably in various cement production lines. Our company customizes liners according to the customer’s material properties (hardness, particle size, moisture, etc.) to adjust the motion state of grinding media and improve grinding efficiency. Typical applications include the Guangxi Yulin 1,000,000 t/y cement production site (materials: limestone, clay, iron ore; capacity: 3,200 t/day) and the Hebei Tangshan 800 t/day ceramic proppant production site.

10. Maintenance & Troubleshooting

To ensure long-term stable and efficient operation, a sound maintenance plan is recommended:

• Lubrication: Monitor lubrication of main bearings, reducer, and motor. Ensure sufficient oil. In winter, use appropriate grade of lubricating oil when refilling or changing oil.
• Temperature monitoring: Main bearing bush temperature should be kept below 60°C. Check lubrication immediately if gearbox or bearing temperatures are abnormal.
• Regular inspection: Assign dedicated inspectors to check liner bolts for looseness, mill door sealing, and the condition of lubrication and cooling systems.
• Grinding media management: Replenish grinding media periodically in a ratio of 4:3:3 (large:medium:small). Keep filling rate at 30%–40%.

Common Faults & Solutions

11. Frequently Asked Questions (FAQ)

Q1: What is the price of a cement ball mill?

A: The price varies depending on specification, configuration, and process requirements. Generally, small models (below Φ1.83m) cost less, while large models (Φ3.2m and above) cost more. For detailed pricing, please contact the manufacturer directly.

Q2: How to choose the right model?

A: Selection is mainly based on target output, feed size, material properties (grindability index, moisture content), and system configuration (open/closed circuit, whether equipped with a roller press). For the same specification, output difference between open-circuit and closed-circuit can be 10–20%.

Q3: What is the difference between dry grinding and wet grinding?

A: Dry grinding is suitable for materials with low moisture content; it has high efficiency and low energy consumption, and is the mainstream process in the cement industry. Wet grinding is suitable for high-moisture materials, allowing direct grinding into slurry without a drying step, and noise during wet grinding is lower (about 8 dB reduction).

Q4: Edge drive vs. central drive – which is better?

A: Central drive has higher transmission efficiency, compact structure, and is suitable for high-power configurations. Edge drive has a classic structure, is easier to inspect and maintain, and is suitable for conventional configurations. Both have advantages and can be flexibly selected according to customer needs.

Q5: How often should liners and grinding media be replaced?

A: Replacement cycles depend on material hardness, operating time, and maintenance quality. Generally, liner life is 2–3 years. Grinding media should be replenished quarterly, and partially or fully replaced annually depending on wear. Regular inspection of liner wear and media grading is recommended.

Q6: How can mill output be increased?

A: Optimization measures include: (1) adjust grinding media grading (reasonable proportion of large, medium, small balls); (2) control feed size (as small as possible) and moisture (generally ≤1%); (3) maintain proper filling rate (30%–40%); (4) clean diaphragm and grate plates promptly to prevent clogging; (5) consider adding pre-grinding equipment such as a roller press.