Multotec mill and scrubber liners are specially designed to increase efficiency, reduce downtime, and lower the overall running costs of your milling plant.
With a complete range of mill liner components, from lifter bars and shell plates to centre cones and trunnion liners, we use a range of engineering tools to develop bespoke mill liners tailored to your operational requirements. These tools include Rocky DEM, MillTraj mill liner simulation software, Inventor 3D solid modelling, and AutoCAD.
As your specialist in rubber linings, Multotec offers full plant audits, mill liner installation, maintenance, and condition monitoring services.
The following are our mill liner design criteria aimed at improving liners for plant operational reliability and efficiency:
Multotec scrubber liners suit abrasive minerals, marine use, and clay soils, formulated to resist wear, caking, and sharp seabed deposits.
Multotec ball mill liners boost wear life and mill efficiency with rubber/composite options, tailored to your plant's needs.
Multotec SAG mill liners use rubber composites for impact and wear resistance, tailored for maximum recovery, and mill performance.
Multotec AG mill liners reduce installation time with large integrated rubber, and steel liners, enhancing performance across feed, shell, a...
As a leading mill liner manufacturer in South Africa and a rubber lining company, we offer comprehensive range of liner solutions. This range includes rubber mill liners, MultoMet™ composite mill liners, heavy-duty composite mill liners, steel mill liners, rubber wear plates, and ceramic tiles embedded in rubber wear plates (Rubcer).
The Ball Mill and SAG Mill trommel screens provide a simple mechanism to classify large volumes of mill products.
Trommel screen manufacturers and mill operators believe that the benefits of simplicity and the ability to handle throughputs in excess of 5000 tph of solids make Trommels the preferred equipment for these applications.
Multotec has been supplying trommel screens since 1982 and has the process capability to size mill trommels to suit each customer’s unique requirements. We supply this equipment to both mill OEMs and process plants in diameters of up to 5.5 m and lengths proportional to diameter. Trommels can be dressed in either rubber or polyurethane screening media.
As a result of our vast expertise, we can supply process guarantees with all trommel screens sized by Multotec.
The latest Finite Element Analysis (FEA) techniques are used to reduce fatigue stresses and ensure structural integrity.
Thickness of shell plates can vary to balance mill capacity and liner life. The correct shell plate width to lifter bar height ratio is required for optimum protection by the lifter bars. Shell plates can be designed with a tapered or stepped working face to balance wear characteristics in the mill. Shell plate thickness differs according to mill type and operational specifications, with our standard ranging from 40 to 120 mm thick.
MultoMet™ shell plates, incorporating Hardox strips, are for demanding applications or where the drilling pattern results in a wide shell plate being exposed to a higher wear rate. These Hardox strips cover 60% of the shell plate working surface, increasing its anti-abrasion profile.
Lifter bars function as a lifting mechanism in mills to provide crushing momentum and target the appropriate impact zone of the charge. Impact zones are dependent on mill type and charge level. The leading face angle of the lifter bar is calculated to release the grinding media in relation to mill diameter and critical speed. All our lifter bars are securely fastened with certified T-bolts and sealed on the exterior of the mill with rubber sealing washers and yellow passivated steel cup washers to the appropriate torque values.
Multomet Lifter Bars incorporate Hardox tempered steel inserts to provide extra operational life and thereby extend reline schedule intervals. Lifter bar height and angle are analysed to extend liner life and increase mill efficiency. Grinding media trajectory for toe of charge impact maximises milling potential and targets a reduced cost per ton processed.
HD MultoMet™ lifter bars incorporate cast segments specifically designed to withstand the rigors of larger diameter ball and SAG Mills. Each segment is designed and spaced to provide higher impact forces expected from larger grinding media.
Steel lifter bars are mainly used as a discharge headliner to provide our composite grate plates with the extra protection needed. Their design incorporates lifting lugs to facilitate installation. They can also be designed to suit the spiral design of pulp lifters.
Head plates are custom designed for each mill or scrubber for ease of installation and operation. They are specifically designed to suit mill head drilling patterns. Their outer arc fits into the cut-out of the filling segment to offer additional protection against the possibility of mill surface damage caused by pulp wash. They are moulded in various thicknesses like shell plates, depending on application.
Thickness of shell plates can vary to balance mill capacity and liner life. The correct shell plate width to lifter bar height ratio is required for optimum protection by the lifter bars. Shell plates can be designed with a tapered or stepped working face to balance wear characteristics in the mill. Shell plate thickness differs according to mill type and operational specifications, with our standard ranging from 40 to 120 mm thick.
Rubber grate plates are used in mills with a diameter smaller than 5m where high abrasion isn’t evident or when suitable to the mill head drilling pattern. Our grate plate apertures are tapered in both planes, which completely prevents pegging, thereby ensuring maximum pulp discharge. We use a specific rubber formulation that is highly resistant to abrasion for extended performance.
Composite grate plates are available for larger and/or aggressive mills and comprise an imbedded Hardox matrix steel frame. The imbedded frame is designed to match mill rotation and for resistance against varying mill volumetric pressures. The elastic property of rubber allows for smaller apertures than in steel grate plates whilst still eliminating common pegging problems. Various aperture sizes are available to suit customer requirements. Total mill open area is calculated to provide a combination of retention time and adequate pulp level while maintaining throughput suitable to downstream equipment.
Manufactured from a fabricated steel internal frame, which is then rubber lined, Multotec’ s pulp lifters and discharge gooseneck ensure the correct volumetric flow. These rubber discharge liners provide an optimum pulp discharge rate out of the mill to suit downstream equipment. Rubber-lined pulp lifters and discharge goosenecks are lighter than their steel equivalent which equates to lighter bearing loads. The discharge sets are designed to suit the mill head drilling pattern with consideration to the chamber size to accommodate the flowrate required per mill rotation. Pulp lifters can be supplied in either radial or spiral configurations, of which the latter can potentially increase discharge rate, especially in high-speed mills or those with larger diameters.
Trunnion liners feature a rubber-lined fabricated steel base, which is then rubber-lined. Scrolls can be added to assist with the transition of pebbles in the trunnion. Loose steel-backed rubber liners are also used in larger trunnion and bell mouth linings depending on feed and discharge head design.
As the name implies, high-speed mill liners (HSMLs) are designed for mills that operate at higher speeds than 80% of critical. HSMLs are significantly safer to handle than the traditional grid liners. Further benefits include the following:
Central cones are designed to assist the discharge of the material to increase capacity. These are supplied in segments that are assembled inside the mill for ease of installation. The centre cone section should be directly underneath the pulp lifters section.
Filling, support, and corner segments fit into the corners of the mills and scrubbers to provide a clean interface between the head and shell liners. Multotec’s design locks the head plates and grate plates into position and stops material from collecting in the corners of your mill.
Multotec’s rubber mill and scrubber linings are designed by combining the results of computer simulations and inspection data to optimise charge trajectory and wear life. Multotec can provide the correct rubber formulation and attachment systems, such as lifter bar stainless-steel T-tracks, to suit highly acidic high pH, including diesel floatation collector environments
Our lining components are available in a wide range of designs, dimensions, and profiles. In addition to the standard rubber components, we also supply MultoMet™ composite lifter bars, shell plates, head plates and grate plates.
Multotec installation teams supervise, assist, and undertake complete lining installations. Stock control assistance and condition monitoring are also provided.
Multotec utilises MillTraj software to analyse wear requirements to ensure customised mill liner profile designs that consistently deliver an optimum trajectory of material in your milling plant.
This specialised trajectory modelling measures the variable speed to demonstrate the impact of mill speed. Our in-house display unit features all representative wear-resistant liners and mill charge and has a clear Perspex screen on either side to show the trajectory pattern of mill charge during operation.
Correct mill liner selection is among the most important of your mill components and careful consideration should be given to them. Mill liners protect the mill shell from wear and transfer energy to the grinding charge.
Mill liners developed by Multotec include:
R&D is conducted to maintain exceptional quality, high-performance standards, and high levels of product consistency and reliability. This ensures that mill liners from Multotec achieve your application-specific objectives. This can be seen in the rubber lining in the ball mill design which provides an optimum wear solution for the toughest applications
In fact, the rubber compound used in Multotec’s mill liner components is formulated to provide a combination of good impact, cut and abrasion resistance.
Multotec uses computer simulation to provide optimum liner configuration that extends liner life and increases mill productivity.
Multotec is your turnkey mill and scrubber liner provider:
A milling plant and process audit provides the framework for achieving optimum efficiency in your grinding and crushing application.
Utilising computer simulations such as MillTraj software to optimise liner design and MultoScan and Hawkeye™ to execute condition monitoring, Multotec will help you achieve an optimum mill trajectory, improve equipment service life and tailor a service programme designed to lower your cost per ton.