Ball mill

Tongli Grate Ball Mill

Tongli grid type ball mill transmission bearing adopts double row radial spherical stick bearing, and peripheral gear adopts large modulus alloy cast steel helical gear, so the transmission is stable, the noise is small, and the service life is long. The large gear uses a dry oil atomizer to periodically spray a certain amount of grease to the gear working surface to achieve lubrication. The main bearing of the mill with a barrel diameter of 900-2100mm adopts a spherical bearing, and the one with a barrel diameter of more than 2100mm adopts a completely closed self-aligning rocker type bearing or dynamic and static pressure bearing, that is, the mill is lifted up by high pressure before starting, and the high pressure is stopped for several minutes. After the mill is started, dynamic pressure lubrication is performed to form a dynamic pressure oil film, which greatly reduces the starting current and the installed power can also be reduced accordingly. The main bearing adopts a piston ring seal, and a good seal is achieved with the help of axial rubber strips and grease. The grid type ball mill is equipped with a slow transmission device, which can make the barrel obtain a speed of 0.1r/min, so as to facilitate turning, maintenance or loosening the load. A hydraulic jack device is used to lift the rotating part during maintenance, eliminating the need for expensive large bridge cranes.

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TONGLI Grate Ball Mill

A MACHINE YOU CAN DEPEND ON!

The grate ball mill produced by Tongli Company adopts a double-bin design, with two parts: the feed bin and the grinding bin. The grinding bin contains steel balls of different specifications for continuous grinding process.

Design of discharge method

The ore discharged through the grating plate and the discharge port makes the discharge particle size uniform, avoiding the situation of too coarse or too fine.



Low maintenance cost

The equipment structure is reasonably designed, and the wear-resistant material has a long service life, which reduces the maintenance frequency and maintenance cost of the equipment and ensures the long-term stable operation of the equipment.

Structural design

The grinding cylinder of this type of ball mill is equipped with grating plates, which are usually distributed at the end of the grinding cylinder. These grating plates help control the discharge speed of the material. The structure of the mill is relatively simple and maintenance is relatively convenient.

Model SpecificationCylinder Rotation Speed (r/min)Ball Load (t)Feed Size (mm)Discharge Size (mm)Output (t/h)Power (kW)Weight (t)
TLG900×1800381.5≤200.075-0.890.65-218.53.6
TLG900×3000382.7≤200.075-0.891.1-3.5224.6
TLG1200×2400323.8≤250.075-0.61.5-4.84512.5
TLG1200×3000325≤250.074-0.41.6-54512.8
TLG1200×4500327≤250.074-0.41.6-5.85513.8
TLG1500×3000278≤250.074-0.42-59017
TLG1500×45002714≤250.074-0.43-611021
TLG1500×57002715≤250.074-0.43.5-813224.7
TLG1830×30002411≤250.074-0.44-1018028
TLG1830×64002423≤250.074-0.46.5-1521034
TLG1830×70002425≤250.074-0.47.5-1724536
TLG2200×55002130≤250.074-0.410-2237048.5
TLG2200×65002131≤250.074-0.414-2638052.8
TLG2200×75002133≤250.074-0.416-2938056
TLG2400×700020.439.5≤250.074-0.420-3247568

FAQ

1. Working Principle of a Grate Ball Mill?

Materials enter the ball mill through an inlet (usually a feeding port). Inside the mill, a certain quantity of grinding media (such as steel balls, cast iron balls, or ceramic balls) is loaded. As the ball mill rotates, the grinding media are lifted to a higher position by centrifugal force and gravity before falling back down, which results in the impact and grinding of the materials. The collision, rolling, and friction between the grinding media and the materials ensure thorough grinding.

Since the interior of the ball mill is enclosed, the grinding process occurs in a relatively closed environment where the media and materials continually interact. The grate ball mill features a grate plate installed inside it. The purpose of the grate plate is to discharge the ground material from the mill. The grate plate has many small holes that allow fine materials to pass through while larger particles are retained in the mill for further grinding, thus achieving effective material classification.

The finely ground material exits the mill through the holes in the grate plate and is typically transported to the next stage of processing or transportation via a discharge device, such as a screw conveyor.

2.How to Increase the Output of a Grate Ball Mill?

1.Optimize Grinding Media:
Ensure that the size and hardness of the grinding media (such as steel balls) in the ball mill are suitable for the type and particle size distribution of the ore being processed. Rational selection of grinding media can improve grinding efficiency and output.
2.Pre-treatment of Raw Materials:
Conduct appropriate pre-treatment of raw materials, such as crushing and screening, to ensure uniform particle size and suitable feed size for the mill. This can enhance the working efficiency of the ball mill.
3.Control of Grinding Media Load:
Control the loading amount of grinding media to keep it within the optimal range. Too little grinding media can reduce grinding efficiency, while too much can lead to excessive wear.
4.Adjustment of Moisture and Additives:
Properly adjust the type and amount of moisture and additives added during the grinding process. This can improve the grinding process, thereby increasing output and product quality.
5.Regular Inspection and Maintenance:
Regularly inspect and maintain various parts of the ball mill, such as bearings and gears, to ensure normal operation of the equipment. This helps avoid production drops due to equipment failures.
By implementing these measures, you can effectively increase the output of a grate ball mill while ensuring product quality and long-term stable operation of the equipment.

3. Maintenance of a Grate Ball Mill?

Maintaining a grate ball mill is crucial to ensure efficient operation and extend its service life. Regularly check the oil level, oil quality, and oil flow in the lubrication system. Ensure that the lubrication oil is sufficient and uncontaminated. Replace the lubrication oil periodically according to the manufacturer's recommendations. This usually involves the lubrication oil for components such as the main shaft bearings and gearbox.

Regularly inspect and calibrate the mill's rotation speed to ensure it runs within the set range. Adjust and replace the liners and grinding media as needed, based on the grinding performance and wear condition. Properly maintained liners and media can greatly enhance grinding efficiency. Additionally, perform anti-corrosion treatment on the equipment surfaces and components to prevent corrosion caused by environmental humidity or other factors.

Provide regular training for operators to ensure they understand the correct operation methods and maintenance knowledge. Proper training helps prevent equipment failure caused by improper operation. Regular and systematic maintenance not only reduces the occurrence of faults and enhances the operating efficiency of the equipment but also effectively extends the service life of the ball mill.

4. Grate Ball Mill Applications?

Grate ball mills are widely used in various industries including mining, building materials, and chemicals. They are primarily employed for grinding and crushing a variety of ores and materials. The key application areas include:
Mining Industry
Metal Ores: Grate ball mills are used for grinding metal ores such as iron ore, copper ore, lead-zinc ore, and bauxite. The mills grind these ores into fine powders suitable for subsequent beneficiation and smelting processes.
Non-metallic Ores: These mills are also used for grinding non-metallic ores like limestone, talc, and phosphate ores to produce fine or ultrafine powders for various applications.
Building Materials Industry
Cement Production: Grate ball mills grind raw materials (like limestone, clay, and iron ore) and cement clinker to produce cement powder.
Glass Production: These mills grind raw materials (such as quartz sand and feldspar) used in glass manufacturing.
Chemical Industry
Fertilizer Production: They grind raw materials for fertilizer production, including phosphate ores and nitrogen fertilizer raw materials.
Paints and Pigments: Grate ball mills prepare fine powders for paints and pigments, enhancing their uniformity and dispersion.
Metallurgy Industry
Smelting Materials: Used for grinding various smelting materials, including copper, lead, and zinc ores, making them suitable for subsequent smelting processes.
Energy Industry
Coal Processing: These mills grind coal to produce coal powder or ash, which is used for combustion or gasification purposes.
Other Industries
Ceramics Industry: Grate ball mills grind ceramic raw materials such as clay and quartz for the production of ceramic products.
Pharmaceutical Industry: Used for grinding medicinal materials or other raw materials to produce pharmaceuticals or pharmaceutical intermediates.
The versatility and efficiency of grate ball mills make them indispensable across these diverse industries, facilitating various production processes by providing finely ground materials.

5. Common Issues with Grate Ball Mills?

The internal components of a ball mill, such as liners and grinding media, can suffer from severe wear or loosening. Additionally, an unbalanced installation or an unstable foundation, and uneven feeding that leads to unbalanced loads, can all cause excessive vibration and noise. It is important to regularly inspect and tighten internal components and replace worn parts when necessary. Ensure that the foundation of the ball mill is stable and that the equipment is installed in a balanced manner. Monitor the feeding system to ensure an even feed rate.

In cases of discharge blockage, it is necessary to regularly inspect and clean the discharge system, as well as optimize the design of discharge pipes to ensure smooth material flow. Adjust the rotation speed of the ball mill to an appropriate range to maintain optimal grinding conditions.

Regularly inspect and maintain the equipment to ensure all components are functioning properly. Implement practices to prevent excessive power consumption, thereby enhancing the mill's operational efficiency and longevity.

6. Impact of Climatic Conditions on Grate Ball Mills

High temperatures can reduce the viscosity of the lubricating oil inside the ball mill, diminishing its lubricating effect and increasing wear. Additionally, high temperatures can cause the equipment to overheat, affecting its normal operation. To mitigate these issues, ensure good ventilation and cooling systems are in place. Regularly inspect and replace lubricating oil to maintain the equipment at an optimal working temperature.

Low temperatures can cause the lubricating oil to thicken, affecting its flow and lubrication effectiveness. The metal components of the equipment may contract due to temperature changes, increasing the risk of wear or malfunction. To address this, choose lubricating oils suited for low-temperature environments and use heating devices to preheat the lubrication system, ensuring the equipment operates normally in cold conditions.

High humidity can lead to rust and corrosion of equipment components such as the electrical system and bearings, shortening the equipment's lifespan. Moisture can also affect the performance of lubricating oils. Regularly inspect and clean the equipment, use anti-rust and anti-corrosion treatments, keep the working environment dry, and install dehumidification devices.

Unstable power supply can cause operational instability in the ball mill, affecting its normal operation and production efficiency. To ensure stable operation, use a reliable power supply system or an uninterruptible power supply (UPS) device.

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