Selecting the appropriate material and profile for customized mill liners is a crucial aspect of the process.
Mill liners serve to mitigate the impact and abrasion of the grinding media, safeguard the mill shell from wear and impact, and extend the lifespan of the mill. During the grinding process, hard ores, as well as steel balls and rods, are subjected to repeated impact on the shell. Without the protection of a well-designed mill liner system, the shell will inevitably suffer damage.
The mill liner system comprises the following components:
Liner Body: The liner body is typically cast from wear-resistant materials, including high manganese steel, high chromium cast iron, alloy steel, and others. Additionally, liners are available in a combination of rubber and steel backing plates, offering versatility for use with different materials.
Fixing Device: The fixing device is typically secured with 10.9 grade high-strength special bolts. The bolts are available in three different head shapes: round, square and oval. The purpose of the mounting is to secure the liner firmly to the mill shell, thereby preventing loosening and potential detachment during mill operation.
Sealing Parts: It is essential to ensure that the liner and the mill shell are properly sealed to prevent material leakage. The fixing device (bolt) of the liner should be fitted with a 10mm thick rubber gasket to effectively isolate the gap between the bolt holes and the outside.
A mill liner with a reasonable contour shape can optimize the material flow and grinding effect in the mill, reduce the energy consumption of the mill and improve the production efficiency.
The design of mill liners varies considerably from one application to another and cannot be generalized. The range of mill liner types includes flat liners, platen liners, cambered liners, spiral cambered classification liners, wave liners, step liners and so on. This variety allows us to provide the right solution for each application and process section within the mill.
In most cases, mill liners can be further classified according to their specific roles, with the categories typically including shell liners, diaphragm liners, and lifter liners.
When customizing mill liners, it is essential to make careful trade-offs (in most cases, the original design can be retained) with full consideration of factors such as mill dimensions, operating conditions and material properties. This allows for the optimization of liner selection, if necessary, in order to achieve highly efficient grinding, a prolonged equipment service life and increased overall productivity.
The selection of mill liners for different mills depends on a number of factors.
SAG Mill
SAG (semi-automatic grinding) mill liners are typically made of cast alloys. In some cases, steel-backed rubber liners may be used, depending on the size and nature of the material being processed. Due to the necessity of withstanding the considerable impact of the big material, the alloy steel liner must be not only wear-resistant, but also highly impact-resistant. An appropriate ratio of casting material and a suitable heat treatment process can significantly improve the impact resistance of mill liners.
Ball Mill
Ball mill are a common piece of equipment in the mineral processing industry, particularly for processing cement raw materials. Their primary function is to grind a range of materials into a fine powder. Ball mill liners are typically manufactured from high manganese steel, high chromium cast iron, chromium-manganese alloy, and a rubber-steel backing plate combination. Following heat treatment, these liners demonstrate extremely high wear and impact resistance. The typical service life is 6,000 to 10,000 hours.
Rod Mill
A rod mill is a key piece of equipment used for grinding ores. The use of steel rods as grinding media offers several advantages over ball mills. The line contact between the rods is more favourable to coarse grinding operations, effectively avoiding the issue of over-crushing. Rod mill liners are typically manufactured from high manganese steel or high carbon alloy steel, which can significantly extend the service life of the liners and minimize machine downtime through the use of optimal contour design and configuration.
At CAFU, we supply high-quality mill liners that offer reliable performance and consistent quality. Our wear-resistant liners provide the best protection for your mill shell and can help you optimize the overall grinding performance of your mill.
A high-performing mill liners will increase productivity, reduce maintenance costs and provide consistent, high-quality grinding results. If you are looking for a mill lining supplier that can provide reliable performance at an affordable price, we invite you to contact us today for a consultation.
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