Tongli rod mill is a kind of grinding equipment used in mineral processing, building materials, chemical industry and other industries. It is mainly used for crushing various ores and other materials. Rod mill is similar to ball mill, but its grinding medium is steel rods instead of steel balls. This design gives it unique advantages in certain applications. The working principle of rod mill is to grind by the relative movement between steel rods and materials in the rotating cylinder. The steel rods contact the material along the cross section inside the cylinder and produce impact and grinding action, finally crushing the material to the required particle size. The diameter and length of rod mill are generally between 1.2 meters and 4.5 meters, and the length can reach 6 meters or even longer. Rod mills of different sizes are suitable for production processes of different scales.
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The rod mill produced by Tongli Company is suitable for a wide range of materials, and can process materials from medium hardness to very hard materials, and can maintain good grinding effect in materials with high moisture content. It is suitable for processing various types of ores and raw materials.
The structure of the rod mill is relatively simple, mainly consisting of a cylinder, a main bearing, a transmission device and grinding media. It is relatively easy to operate and maintain, especially under the management of experienced operators, and can maintain a stable operating state for a long time.
Rod mills are usually operated in a closed system, which helps control dust, reduce environmental pollution, and can recycle and utilize the heat generated during the production process, further improving energy efficiency.
Due to the low wear rate of steel rods, the consumption of grinding media during the operation of the rod mill is relatively small, which not only reduces production costs, but also reduces the need for equipment maintenance.
Model | Diameter | Length | Feeding Size (mm) | Discharge Size (mm) | Capacity (t/h) | Power (kW) | Total Weight (kg) |
TLZJ0918 | 900 | 1800 | 36-38 | 25 | 0.62-3.2 | 18.5 | 5500 |
TLZJ0924 | 900 | 2400 | 36 | 25 | 0.81-4.3 | 22 | 6100 |
TLZJ1224 | 1200 | 2400 | 36 | 25 | 1.1-4.9 | 30 | 12000 |
TLZJ1530 | 1500 | 3000 | 29.7 | 25 | 2.4-7.5 | 75 | 16800 |
TLZJ1830 | 1830 | 3000 | 25.4 | 25 | 4.8-11.6 | 130 | 29000 |
TLZJ2130 | 2100 | 3000 | 23.7 | 25 | 14-35 | 155 | 34800 |
TLZJ2136 | 2100 | 3600 | 23.7 | 25 | 19-43 | 180 | 37000 |
TLZJ2430 | 2400 | 3000 | 21 | 50 | 25-65 | 245 | 54000 |
TLZJ2736 | 2700 | 3600 | 20.7 | 50 | 32-86 | 380 | 86000 |
TLZJ2740 | 2700 | 4000 | 20.7 | 50 | 32-92 | 400 | 94000 |
TLZJ3245 | 3200 | 4500 | 18 | 50 | 64-180 | 630 | 137000 |
The Tongli rod mill uses advanced controllable feeding and discharging technology, combined with appropriate grinding media tailored to the actual grinding materials of the user. This changes the traditional ball mill's surface contact to line contact, making the particle size of the sand output more uniform and the production capacity higher. It is suitable for ores of different hardness (Mohs hardness 5.5~12).
When the rod mill is in operation, it is driven by a motor through a speed reducer and a surrounding large gear reduction transmission, or directly by a low-speed synchronous motor through a surrounding large gear reduction transmission, to rotate the cylinder. The cylinder is filled with a suitable grinding medium—steel rods. Under the action of centrifugal force and friction, the grinding medium is lifted to a certain height and then falls down in a dropping or cascading state.
The material to be ground is continuously fed into the cylinder through the feeding port and is crushed by the moving grinding medium. The crushed product is then discharged out of the machine through overflow and continuous feeding, ready for the next stage of processing.
Optimizing the grinding concentration can significantly improve the output of a rod mill. It is generally recommended to control the concentration within the range of 60%-70%, adjusting based on the properties of the ore and the grinding process. The speed of the rod mill should be maintained between 65%-85% of the critical speed. Modestly increasing the speed can boost grinding efficiency, but care must be taken to avoid excessive speed that could cause vibrations in the mill.
Regular inspection and maintenance of various parts of the rod mill, especially the bearings and transmission system, are essential to ensure smooth operation. Flexibly adjust operational parameters such as the feed rate, water addition, and grinding time according to the different properties of the ore and production requirements. Promptly repair or replace worn internal components of the mill, such as liners and grinding media, to prevent unplanned downtime due to equipment failure and ensure continuous production.
The maintenance of a rod mill is crucial to ensure its long-term stable operation and high efficiency. Regularly inspect the lubrication system to ensure that the lubricating oil is sufficient and clean. Replace the lubricating oil according to usage conditions to prevent bearing wear due to poor lubrication. Check the operational status of the motor and the speed reducer, paying attention to any abnormal noises or vibrations, and periodically tighten bolts and couplings.
Inspect the wear condition of the mill’s cylinder liners and grinding media regularly, and promptly replace severely worn parts to prevent equipment damage due to excessive liner wear. The operational load of the rod mill should be kept within a reasonable range to avoid overloading. Overloading can lead to increased wear and tear on the equipment and may even cause equipment damage.
Based on the operational status of the equipment, formulate a reasonable overhaul plan, typically once every year or six months. During the overhaul, comprehensively inspect all parts of the equipment and replace components that are severely worn or have faults.
Ore Processing
Intermediate Crushing After Coarse Crushing: The rod mill is primarily used for the intermediate and fine crushing of ores after they have been coarsely crushed. It is suitable for handling larger ore particles, providing an appropriate particle size for further fine grinding.
Brittle Ores: It is effective for brittle ores, such as lead-zinc ore and copper ore.
Grinding Operations: In the ore grinding process, the rod mill is often used in the stages of coarse grinding and intermediate grinding, providing suitable raw material particle sizes for subsequent fine grinding operations.
Metallurgical Industry
Iron Ore: The rod mill can process iron ore, preparing it for subsequent processes such as flotation or roasting.
Lead-Zinc Ore: When processing lead-zinc ore, the rod mill can effectively grind the ore to the required particle size, increasing the flotation recovery rate.
Chemical Industry
Fertilizer Production: The rod mill is used for grinding raw materials for fertilizers, such as phosphate rock and potash, ensuring uniform particle sizes for subsequent processing.
Ceramic Raw Materials: In the ceramic industry, it is used for grinding raw materials like clay, making them finer and improving the quality of ceramic products.
Building Materials Industry
Cement Raw Materials: In cement production, the rod mill can be used to grind raw materials (such as limestone and clay) to the required fineness, improving the quality of cement.
Glass Raw Materials: It is used for grinding raw materials in glass manufacturing, ensuring uniform particle sizes to guarantee the quality of glass products.
Metal Smelting
Bauxite: The rod mill can be used for grinding bauxite, making the ore reach the particle size required for aluminum extraction.
If the feed particle size is too large, it can reduce the grinding efficiency. Severe wear of the grinding media will lower the grinding effectiveness. Improper mill speeds, whether too high or too low, can also negatively impact grinding efficiency.
Bearing wear or damage can lead to equipment vibrations and noise. Loose or worn cylinder liners inside the mill can cause abnormal noises. Issues with gears or couplings in the transmission system can also result in vibrations and noise.
Regularly inspect the bearings and replace them promptly if issues are detected. Frequently check the cylinder liners to ensure they are secure and not excessively worn. Inspect the transmission system to ensure that gears and couplings are functioning correctly, making adjustments or replacements as necessary. Ensure that the grinding media are evenly distributed within the cylinder to avoid uneven grinding effects.
High Temperature
In high-temperature environments, various components of the rod mill, such as bearings and the lubrication system, may overheat, affecting the stability and lifespan of the equipment. High temperatures can accelerate the oxidation and degradation of lubricating oil, reducing its effectiveness and potentially leading to excessive wear on bearings and gears.
Mitigation Measures for High Temperature
To mitigate these effects, cooling devices such as fans or cooling systems can be installed to ensure effective heat dissipation. Using lubricating oils suitable for high-temperature environments and replacing them regularly can help maintain lubrication effectiveness.
Low Temperature
In low-temperature environments, the viscosity of lubricating oil increases, which may lead to poor lubrication and affect the normal operation of the equipment. In extremely low temperatures, some components of the equipment might freeze, hampering startup and operation.
Mitigation Measures for Low Temperature
For low-temperature conditions, select lubricating oils that remain fluid in cold environments to ensure proper lubrication. Implement anti-freeze measures, such as installing heating devices or using insulation materials, to prevent the equipment from freezing.
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