Types of ball mill liners, how to select?
Introduction to the AGICO Ball Mill Liners
Ball mill liners are key components installed on the inner surface of the mill shell, primarily serving to separate the grinding media and material from the shell, thereby preventing direct impact and friction. AGICO supplies a wide range of liners for various ball mills, and also supports custom manufacturing based on customer drawings.
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Different Types of Ball Mill Liner
Classified by material type
| Category |
 |
 |
 |
 |
| Alloy Steel ball mill Liner | High Chrome Cast Iron Liner | High Manganese Steel Liner | Rubber ball mill Liner | |
| International standard | ASTM A532 Class III, 42CrMo4, Cr-Mo series | ASTM A532 Class I (Cr15~Cr26), Ni-Hard 4 | ASTM A128 Grade A/B/C, Mn13%, Mn18% | NR, SBR, NBR, meet ASTM D2000 |
| Hardness (HRC) | 45-55 | 58-65 | Initial ~20, work-hardened 45-55 | Shore A 60-75 |
| Impact Resistance | Good | Poor | Very High | Excellent |
| Wear Resistance | Good | Very High (2-3× Mn steel) | Moderate | Good (for soft/medium materials) |
| Main Advantages | Balanced strength and toughness, good overall performance, longer life than Mn steel | Excellent wear resistance, long service life, reduces downtime for replacement | Excellent toughness, high resistance to impact fracture, moderate cost | Lightweight, noise reduction (~15 dB), corrosion resistant, quick installation, no product contamination |
| Applications | Secondary grinding in concentrators, cement mills, coal mills | Cement clinker mills, slag mills, fine grinding compartments | Mining (primary grinding), large AG/SAG mills | chemical industry, wet cement mills |
Classified by structure type
Ball Mill Classifying Liner
The classifying liner is a type of mill liner with an automatic self-classifying function. Its surface features a conical or spiral profile gradually changing along the axial direction of the mill, allowing grinding media of different sizes to naturally separate as the shell rotates. This liner is primarily used in multi-compartment ball mills, tube mills with a large length-to-diameter ratio, and fine grinding processes that have strict requirements for particle size distribution, such as cement finish grinding and slag powder preparation.
Ball Mill Double Waved Liner
Duble wave liner adds a reverse auxiliary wave in the trough, forming a double-wave structure. This design significantly reduces the slippage of grinding media in the trough, improves energy transfer efficiency, and makes media motion more stable. The double wave liner is suitable for modern high-efficiency cement mills, slag mills, and fine grinding compartments of large ball mills.
Ball Mill Grate Liner
The grate liner is typically installed at the discharge end of a ball mill. Its structure features slots or openings of a certain size, which allow properly ground material to pass through while preventing grinding media from being discharged. The grate liner is often used together with lifter bars. It effectively controls the retention time of material and media inside the mill, avoids over-grinding, and increases the discharge rate. This type of liner is suitable for grate discharge ball mills, especially for wet grinding processes that require a fine discharge size and rapid material passage, such as non-ferrous mineral processing and cement raw meal preparation.
Ball Mill Single Wave Liner
The single wave liner is the most common and widely used type in ball mills. Its surface has a regular continuous wave profile. This liner moderately lifts the grinding media and then throws them down, achieving a good balance between crushing and grinding. The single wave liner can be used in both coarse and fine grinding compartments, offering strong versatility. It is suitable for various materials and operating conditions, such as cement clinker, iron ore, and coal powder. Therefore, it is the preferred liner type for standard ball mills.
Ball Mill Step Liner
The step liner has a stepped profile with lifter bars. Its working face is typically perpendicular or angled to the shell. This design lifts media efficiently, giving steel balls a high drop height for strong impact crushing. Used in coarse grinding or high-impact applications like SAG mills. Disadvantage: stress concentration at the lifter bar root, requiring tough materials such as high manganese steel.
Smooth Ball Mill Liner
The smooth liner has a smooth or very lightly textured surface with a low coefficient of friction. Its main function is to drive the grinding media through sliding and abrasion, with relatively weak impact action, making it more suitable for fine grinding processes. The flat liner effectively reduces over-grinding and lowers specific energy consumption. It is suitable for low-impact, abrasion-dominated conditions, such as fine grinding compartments in the cement industry or regrinding operations in concentrators.
Function Design of Ball Mill Liner
Protective cylinder
The liner plate separates the grinding media from the cylinder, effectively buffering the direct impact and friction of the media, thereby extending the service life of the cylinder and the entire machine.
Drive the movement of the grinding media
The special shape of the liner surface causes a large friction force when it comes into contact with the grinding media, thereby lifting the grinding balls upwards. When the steel balls are lifted to a certain height and then thrown down, they exert impact and grinding effects on the materials. Different shapes of liners can generate different trajectories for the media, thereby achieving different grinding effects.
Achieving the classification of grinding media
The liner has an automatic classification function, which enables grinding media of different sizes to be reasonably distributed along the axial direction of the mill: larger steel balls are concentrated at the feeding end and are used for crushing larger materials. Small steel ball is focused on the discharge side, used for smaller grinding material. This classified arrangement significantly improves the grinding efficiency.
How Do You Choose The Right Liner
Based on Material Properties and Mill Type
First, the basic process conditions should be clearly defined. For dry grinding, alloy steel or high chrome cast iron liners are preferred, while rubber liners are more suitable for wet grinding. For coarse grinding stages with high impact force, high manganese steel or non-smooth liners should be selected due to their strong impact resistance. For fine grinding stages, high chrome cast iron or smooth liners with outstanding wear resistance are required.
In addition, material hardness is also critical: for grinding high-hardness materials such as iron ore and granite, high manganese steel or high chrome cast iron is the first choice; for medium-hardness materials such as limestone, alloy steel is sufficient.
Reference Industry-Specific Selection Practices
Different industries have accumulated practical experience, which can greatly reduce trial and error costs.In cement and building materials industry, grinding clinker requires very high wear resistance. high chrome cast iron or high alloy steel liners are commonly used. In the power industry, the commonly used coal mills are designed to be both wear resistance and impact resistance are needed. The medium/high carbon alloy steel or Cr15/Cr18 type alloy cast iron liners are often selected. In wet grinding environment of mine, the corrosion resistance of alloy steel and the light weight noise reduction of rubber lining plate have obvious advantages
Balancing Initial Investment and Long-Term Operating Costs
When selecting liners, it is essential to compare the Total Cost of Ownership (TCO). Although high chrome cast iron liners have a higher unit price, their service life is typically 2 to 3 times longer than that of ordinary liners, which significantly reduces the overall losses caused by downtime for replacement. Rubber liners have a moderate initial cost, and due to their advantages such as energy savings, noise reduction, and easy maintenance, their long-term cost per ton of material processed is often lower.
Supplier Capability and Installation & Maintenance Details
Finally, attention should also be paid to the supplier's technical support capability and the ease of liner installation. Choosing a supplier with reliable quality and the ability to provide professional selection advice is far more important than simply comparing prices. At the same time, standardized liner dimensions (e.g., width 314 mm, length 500 mm for full pieces or 250 mm for half pieces, thickness 40–50 mm) help reduce spare parts inventory and maintenance complexity.
Price Reference For Ball Mill Liners
Price Range Reference
| Material Type | Reference Price (FOB China Main Port) | Remarks |
|---|---|---|
| High Chrome Cast Iron Liner | USD 2,500–3,200 / ton | Cr15~Cr27, hardness ≥58 HRC; higher grades (Cr26/Cr27) near upper limit |
| Cr-Mo Alloy Steel Liner | USD 2,000–2,500 / ton | Contains Cr, Mo, Ni; suitable for cement mills & secondary grinding |
| Manganese Steel Liner | USD 1,500 / ton (MOQ ≥20 tons) | Mn13, Mn18Cr2; higher price for small batches |
| Rubber Liner | Quoted per set | Based on mill model |
* Prices are for reference only.
Key Factors Influencing Liner Prices
Raw Material Cost
Liner prices closely follow international market prices of alloys (Cr, Mo, Ni) and rubber. Higher alloy content increases cost. Suppliers may add a raw material surcharge to hedge against price volatility.
Design Complexity & Customization
Standard liners benefit from mass production and lower unit price. Custom designs (special shapes, high lifters, composite structures) increase mold and machining costs.
Purchase Quantity & Order Scale
Large orders spread fixed costs (molds, heat treatment batches), resulting in more competitive unit prices. Overseas customers are advised to consider long-term frame agreements or bulk orders.
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