Ball mill is a grinding equipment widely used in mining, building materials, the chemical industry, and other industries. It is mainly used to grind ores of various hardness, chemical raw materials, and other materials to the required fineness. Its working principle is to drive the internal grinding media, such as steel balls or ceramic balls, to move through the rotation of the cylinder, and use the impact, friction, and extrusion of the media to achieve material crushing.
Ball mill is a kind of grinding equipment widely used in mining, building materials, the chemical industry, and other industries. It grinds the material to the required fineness through the collision and friction between steel balls or ceramic balls and materials. It has a simple structure and stable operation, and is one of the key equipment in the mineral processing process.
1. Barrel: Carrying grinding media (steel balls) and materials, made of high-strength steel, wear-resistant and corrosion-resistant.
2. Liner: Protect the barrel, reduce wear, and extend the life of the equipment.
3. Transmission device (motor, reducer, gear): Provide power to ensure stable operation.
4. Feed and discharge device: Control the material in and out to ensure grinding efficiency.
5. Grinding media (steel balls/ceramic balls): Directly affect the grinding effect, and different materials can be selected according to the hardness of the material.
cement ball mill plant
Mining Ball Mill
Inner wall lining
Ball mill steel balls
Ball Mill is an industrial equipment that uses steel balls, ceramic balls, or other grinding media to crush and grind materials. It drives the grinding media to collide, rub, and impact with the material through the rotation of the cylinder, so that the material is gradually crushed to the required fineness.
• Metal ore: grinding operation in the beneficiation process of gold, copper, iron, lead-zinc, molybdenum, tungsten, and other ores.
• Non-metallic minerals: fine grinding of limestone, quartz sand, feldspar, barite, fluorite, graphite, kaolin, and other minerals.
• Cement production: used for grinding raw materials, clinker, and slag to improve cement quality.
• Slag treatment: recycling of steel slag, slag, and tailings to improve resource utilization.
• Metal powder: preparation of metal powders such as iron powder, copper powder, and aluminum powder.
• Coal powder preparation: used for coal powder grinding in thermal power plants to improve combustion efficiency.
The optimized design and wear-resistant materials reduce energy consumption by 20%-30% compared with traditional crushing equipment, and the grinding efficiency is increased by more than 35%, which greatly reduces production costs.
It can process various ores, chemical raw materials, and solid waste (such as steel slag, fly ash) with Mohs hardness ≤9; it supports dry grinding and wet grinding to meet the fineness requirements of different industries (80-2500 mesh adjustable).
The core components have a long life, the high manganese steel liner has a service life of 5-8 years, and the gear transmission system adopts carburizing and quenching technology, with a failure rate of <1%.
By adjusting the grinding medium (steel ball/ceramic ball) ratio, the cylinder speed (0.5- 40 rpm), and the grading system, the finished product fineness error can be controlled within ±2μm.
The working principle of ball mill grinding is to achieve material crushing and grinding through strong collision and friction between the rotating grinding drum and the internal grinding media. In this process, the particle size of the material gradually decreases to achieve the required fineness and uniformity.
1. Initial stage: the number of grinding balls is small, the particles in the material are large, and the grinding balls have little wear on the material.
2. Stable stage: with the increase of running time, the number of grinding balls gradually increases, the particles in the material gradually become smaller, the grinding balls gradually increase the wear on the material, and the material is gradually ground.
| Model | Capacity(t/h) | Rotate speed(r/min) | Grinding Balls(t) | Motor Power(kw) | Gear box | |
|---|---|---|---|---|---|---|
| Model | Speed Ratio | |||||
| Ф1.2x4.5 | 1.6-5.8 | 30.3 | 5 | 55 | ZD30 | 4.5 |
| Ф1.5x5.7 | 3.5-6 | 26.34 | 11 | 130 | ZD40 | 4 |
| Ф1.83x6.4 | 6.5-15 | 23.9 | 21 | 210 | ZD60 | 4.5 |
| Ф1.83x7 | 7.5-17 | 24.5 | 23 | 245 | ZD60 | 4.5 |
| Ф2.2x6.5 | 14-20 | 21.4 | 31 | 280 | ZD70 | 5 |
| Ф2.4x7 | 17-28 | 20.4 | 39 | 380 | ZD80 | 5 |
| Ф2.4x8 | 20-35 | 20.3 | 42 | 570 | ZD80 | 5 |
| Ф2.4x12 | 35-45 | 20 | 63 | 800 | MBY710 | 6.3 |
| Ф2.4x13 | 35-38 | 19.4 | 68 | 800 | MBY710 | 6.3 |
| Ф2.6x13 | 40-55 | 19.5 | 82 | 1000 | JDX800 | 6.3 |
| Ф3x9 | 50-55 | 18.34 | 78 | 1000 | JDX800 | 6.3 |
| Ф3.2x9 | 60-70 | 17.6 | 95 | 1250 | MBY900 | 7.1 |
| Ф3.5x11 | 75-85 | 16.8 | 150 | 1250 | JDX900 | 5.84 |
| Ф3.8x12 | 85-110 | 17 | 175 | 1600 | MBY800 | 5.6 |
| Ф4.6x10+3.5 | 180-210 | 15 | 278 | 3550 | JQS3500 | 15.1 |
Wet method: Suitable for subsequent flotation processes or scenes that require dust prevention (such as gold mines and copper mines), with low energy consumption but requiring wastewater treatment.
Dry method: Suitable for industries that do not require liquids, such as building materials and chemicals, but requires a dust removal system.
Steel balls: High density and strong impact force, suitable for hard materials such as metal ores, but may introduce iron impurities.
Ceramic balls: Pollution-free and corrosion-resistant, suitable for fields with high purity requirements (such as electronic-grade silicon powder), with a high cost.
Capacity (t/h) = 0.2×Cylinder effective volume (m³)×Filling rate (25%-45%)×Material density
▶ For example: When a Φ2.4×6m ball mill wet grinds iron ore, the theoretical capacity is about 8-12t/h.
Optimize the steel ball grading: large balls (Φ100mm) account for 40% + small balls (Φ20mm) account for 60% impact is more efficient.
Frequency control: adjust the speed according to the hardness of the material, saving 15%-20% energy.
Regular maintenance: replace the worn liner in time to avoid ineffective power consumption.
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