Mill liners optimized to meet your targets

As part of a system solution, the head lining is designed with consideration to the shell lining design. All components must be in balance to minimize the number of maintenance stops.

We keep the number of individual parts to a minimum and to ensure that parts do not interfere with each other during installation. Liners that are most subject to wear are made more robust, and whenever possible these high wear parts are designed to be independently replaceable.

The shell lining has a major influence on grinding efficiency. It transforms the mill rotation into charge motion and both profile and spacing must be carefully selected to suit each specific mill.

When designing a shell lining, Metso Outotec considers the type of grinding, mill size and speed, maintenance schedules, safety, impact levels, efficient use of materials, and many other parameters.

Metso Outotec’s wear-resistant rubber-covered or cast dischargers come in two general designs – radial and curved. The larger the mill, the longer the distance the material must travel before being discharged into the trunnion.

A curved discharger design will initiate a flow towards the center of the mill at an earlier stage and ensure that the discharger pan is emptied and ready to be refilled during the next pass through the charge. Prompt removal of material and less backflow will allow the energy to be more efficiently utilized for grinding fresh ore. As less material is recirculated, wear life increases. In addition, increased flow can also contribute to increased throughput and decreased power consumption.

Metso Outotec trunnion liners are custom-made to protect your mill trunnions from internal wear. Fit is critical, and our trunnion liners can be made to almost any size or shape.

Typical design features include internal spirals or dams to control material flow, flanges for the mounting of trommel screens, the inclusion of threaded holes for jacking screws, inspection ports, etc. Metso Outotec trunnion liners are grouped into three categories; One-Piece, Replaceable Sleeve, and Bolted Wear Elements.

Mill trommels, whether used for sizing or scalping, play a vital role in your grinding circuit. Metso Outotec’s robust but light-weight trommel frames consist of carefully selected welded profiles that are covered in a protective layer of wear-resistant rubber or polyurethane. Adapting flanges, if required are available to suit the design of virtually any trunnion or trunnion liner interface.

There are two main types of screen panels – modular and customized. The modular trommel panel with snap-on attachment comes in a standard size of 305 x 610 mm. Installation and replacement of the snap-on screen panels is easily accomplished and results in minimal if any impact on mill availability.