Grinding Mill

Ball Mill

CAPACITY

10-248t/h

FEED SIZE

≤20mm

Application areas：The Ball Mill is not only suitable for fine grinding operations in metal mining, non-metal mining, cement production, and thermal power plants, but also widely used in fixed processing facilities such as chemical plants, ceramic factories, fertilizer plan

Applicable materials：Gold ore, copper ore, iron ore, lead-zinc ore, silver ore, limestone, cement clinker, quartz, feldspar, silicate, slag, fly ash, gypsum, coal, ceramics, and other hard to medium-hard materials requiring fine or ultra-fine grinding (Mohs hardness ≤9).

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Technical Parameters

Model	Cylinder size (mm)	Feed size (mm)	Discharge size (mm)	Motor power (kw)	Capacity (tph)
MQY2400*5000	Φ2400*5000	≤20	0.074-0.4	320	10-70
MQY2700*4000	Φ2700*4000	≤20	0.074-0.4	400	22-80
MQY3200*4500	Φ3200*4500	≤20	0.074-0.4	630	-
MQY3600*5000	Φ3600*5000	≤20	0.074-0.4	1250	-
MQY3600*6000	Φ3600*6000	≤20	0.074-0.4	1250	-
MQY4000*6000	Φ4000*6000	≤20	0.074-0.4	1500	65-248

Frequently Asked Questions

A ball mill is a type of grinding equipment designed to reduce materials such as ores, minerals, chemicals, or ceramics into finer particles or powders. It operates on the principle of impact and attrition: a rotating cylindrical shell filled with grinding media (typically steel balls) lifts the media by centrifugal force. When the media falls back down, it crushes the material through impact, while sliding and rolling produce attrition forces that further grind the material into finer particles. The shell rotates at 40–70% of its critical speed to ensure optimal grinding action.

Mining ball mills are primarily classified into two types based on their discharge method. **Overflow-type ball mills** feature a simple structure where ore slurry naturally overflows from the discharge end, making them ideal for fine grinding of materials like gold, silver, and copper ores to particle sizes of 0.074–0.4mm. **Grid-type ball mills** are equipped with a grid plate at the discharge end to control particle size, designed for coarse to medium grinding (0.2–0.8mm) and widely used in the first stage of multi-stage grinding processes for iron ore, lead-zinc ore, and coal mining.

The critical speed is the RPM at which centrifugal force would pin the grinding media to the mill wall, ceasing grinding action. Ball mills typically operate at 65–85% of critical speed to maintain effective grinding. Operating at 65–75% of critical speed provides the optimal balance where grinding media cascade properly for effective impact and attrition.

In wet grinding, water or process liquid is added to the mill together with the ore, forming a slurry. This is the most common method in mineral processing as it improves grinding efficiency, reduces dust, prevents overheating, and facilitates material transport through pipelines to downstream flotation or leaching circuits. In dry grinding, no liquid is added, and the ground powder is discharged as a dry product — used in cement production, ceramic processing, and applications where moisture would cause product degradation or process issues. For most metal mining applications, wet grinding in a ball mill is recommended for its superior efficiency and compatibility with downstream wet beneficiation processes.

The key difference lies in the grinding media and the resulting product characteristics. A ball mill uses steel balls as grinding media and produces finer, more uniform output — typically below 0.074mm (200 mesh) — making it ideal for fine grinding in the final stage of ore processing. A rod mill uses long steel rods as grinding media, which grind by line contact rather than point contact, producing a coarser, more selectively sized product with less over-grinding (sliming). Rod mills are preferred as the first stage of grinding (before a ball mill) when a coarser, well-graded product is needed, such as in sand making or upstream of a ball mill in a rod mill–ball mill circuit.

A ball mill consists of a cylinder (shell) made of thick carbon steel or alloy steel plates that holds the grinding media and raw materials. The inner surface is lined with wear-resistant liners (manganese steel, rubber, or ceramic) to protect the cylinder. Grinding media (typically steel balls) deliver the grinding force. Diaphragms divide multi-compartment mills into chambers for gradual refinement. Auxiliary components include the drive system (motor, reducer, pinion gear), bearings, and lubrication system.