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wear resistant mill liner with different materials for mills

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wear resistant mill liner with different materials for mills

Key considerations when selecting a mill lining system

Numerous factors must be considered when selecting a mill liner design, including required grinding action, mill size as well as ore and grinding media characteristics, among others. These considerations will help determine the best liner material and geometry. Depending on the mill size and material being ground, a lining system can be manufactured from either rubber or composite, with cast metal alloy inserts moulded into the liners at wear critical locations. In large diameter SAG mills, for example, high energy impacts may require the use of abrasion resistant hardened plate inserts. The key is to select the appropriate lining material for the intended application.

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SAG and ball mills grind material through different actions and are usually applied in different stages of the process. SAG mills usually have a larger diameter than length and are used to reduce large feed size ore down to 3mm, often for further grinding in a secondary process. Ball mills are smaller in diameter than length and can be used in either primary, secondary or tertiary grinding applications to reduce material from 20mm to very fine product sizes measured in microns or mesh. These two types of mills are filled with varying compositions of grinding media. SAG mills contain balls of up to 150mm in diameter that occupy 5% 18% of mill chamber volume. Ball mills, conversely, contain grinding media up to 50mm in diameter, occupying between 25% 40% of mill chamber volume. To effectively reduce material size, each type of mill needs to generate different charge load actions, or the type of motion characterised by the mills contents. SAG mills generate high...

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In the past, grinding mills were typically lined with cast metal linings of varying steel or iron alloys, and lining system selection was typically driven by level of wear protection and cost. As materials technology and design technique has advanced, today many superior alternatives exist to metal linings. Rubber compounds have been developed to protect mill shells from wear, while new cast alloys and wear resistant plates can be bonded into rubber to withstand high impact abrasiveness. There is a greater understanding of how mill lining systems influence mill performance. Operators now select mill lining systems on more criteria including ability to deliver mill process performance, wear resistance, ease of installation and safety. Furthermore, return on investment and total cost of ownership models are important factors in the decision making process, rather than cost alone. Rubber and composite mill liners are increasing in popularity, with several advantages when compared to me...

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Minerals has more than 40 years of experience in designing and manufacturing mill lining systems. Our global range of ® mill liners has been developed through continuous research into new rubber compounds, cast alloys and wear resistant plate delivering improved process and wear performance. Our experienced manufacturing centres are in key locations across the world and our products are supported after sale through a comprehensive and unmatched network of service centres strategically located close to our customers operations. ® mill lining system design and service engineers have extensive global experience and process knowledge, with a deep understanding of high wear protection technologies and mill liner optimisation. Our ®mill lining systems team offers customers competitive solutions for improved energy efficiency, safety, equipment availability and productivity.

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