Mill and Scrubber Linings
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:
- Reduced weight means less wear on bearings, reduced torque requirement at start-up, and improved installation ease and safety
- Excellent sealing properties eliminate particle lock-up and capital equipment damage
- Throughput is increased as the blinding of grate plate apertures is virtually eliminated, especially when compared to their steel grate plate equivalent
- Reduced noise levels improve working conditions and safety during mill operation
- 3D scanning for accurate condition monitoring, liner life predictions, and reline due date notification
- Milling circuit audits & analysis are available to optimise your production
View our Technical Resources to learn about the technology behind our Mill and Scrubber Liners.Learn more
View our Mill and Scrubber Linings:
Scrubber Liners
Multotec scrubber liners suit abrasive minerals, marine use, and clay soils, formulated to resist wear, caking, and sharp seabed deposits.
Ball Mill Linings
Multotec ball mill liners boost wear life and mill efficiency with rubber/composite options, tailored to your plant's needs.
SAG Mill Liners
Multotec SAG mill liners use rubber composites for impact and wear resistance, tailored for maximum recovery, and mill performance.
AG Mill Liners
Multotec AG mill liners reduce installation time with large integrated rubber, and steel liners, enhancing performance across feed, shell, a...
Our Liner offering
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).
SAG Mill Trommel Screens
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.
Our mill and scrubber liner components:
Shell Plates - Rubber
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.
Shell Plates - MultoMet™
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 – Rubber
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.
Lifter Bars – MultoMet™
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.
Lifter Bars – Heavy Duty MultoMet™
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.
Lifter Bars – Steel
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 - Rubber
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.
Head Plates - MultoMet™
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.
Grate Plates - Rubber
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 - MultoMet™
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.
Pulp Lifters
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 & Bell Mouth Liners
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.
High-Speed Mill Liners
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:
- Safer reline schedules, no potential for falling grinding media
- Significantly reduced gold lockup
- Reduced grinding media consumption
- Cheaper operating cost
- No fusing of liners
- No hot-work permits needed
- HSMLs are lighter than grid liners at the end of life
- Shorter reline time
- Reduced operating noise
- Increased grinding surface
- Increased mill efficiency
- No waiting period required for grid liner pockets to fill up with grinding media
Centre Cones
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 & Corner Segments
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 Mill & Scrubber Liners improve the service of your milling plant and help reduce downtime.
Rubber developed for your requirements
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
Mill/Scrubber Linings versus Steel:
- Longer life due to less wear results in substantial cost savings
- Lower product weight reduces downtime during installation and replacement, improving production while eliminating the need for a liner handler
- Resilient material enables easy and safe installation as well as trouble-free handling which reduces the risk of injuries
- Excellent sealing properties that reduce the risk of flushing behind lining and minimise gold lockup
- Reduced blinding of grate plates resulting in increased throughput
- Quieter working environment
- Lighter liners provide safer handling during mill relines
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.
Mill Trajectory Modelling
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.
Our mill trajectory modelling:
- Informs selection of lifter angles and heights related to: mill application, mill size, mill speed, filling and ball size
- Assesses current comminution circuit parameters
- Monitors the condition of comminution and other equipment
- Indicates design improvements
- Is simple to use, with known mill parameters
Contact Multotec today for all your mill & scrubber lining requirements. Complete the enquiry form and we’ll contact you.
Types of mill liners
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:
- Ball mill liners (rubber and composite liners).
- SAG mill liners
- AG mill liners
- Scrubber liners
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.
Mill Liner Design
Multotec uses computer simulation to provide optimum liner configuration that extends liner life and increases mill productivity.
Multotec meets your needs for turnkey mill and scrubber liner solutions
Multotec is your turnkey mill and scrubber liner provider:
- Multotec’s extensive plant monitoring system for wear and liner life analysis is web-based for quick and easy access
- Simple item display and mine stock codes enable easy planning and ordering
- Indication when design changes and inspections are required reduces unplanned stoppages and downtime
- Accurate data capturing and cross referencing
- High accuracy and immediate availability of information filling and ball size
- Hawkeye™ is a web-based system to capture and record wear and life data for Mill Liners
- Highly qualified technical staff available to measure Mills/Scrubbers on site
- In-house process knowledge to analyse the Milling Circuit and optimise your production capabilities
- Technical and back-up services, including Mill or Scrubber Liner inspections
Optimise your comminution with an end-to-end mill audit
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.
- Assess current comminution circuit parameters
- Monitor the condition of comminution and other equipment
- Indicate design improvements with specialised MillTraj software
View our other process solutions:
In the news
- Multotec supplies scientifically designed mill liners with 3D scanning technology to mining operations
- Multotec exhibited innovative integrated solutions at Electra Mining Africa, demonstrating its flexibility and technical expertise
- The future of SAG mills
- Multotec Leads the Way in Composite Liners for Large SAG Mills
- Multotec rubber helps Zambian Copperbelt customer reduce downtime dramatically with installation of heavy duty Multomet liners
- Multotec rubber to market CITIC steel mill liners In Africa
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View our Technical Resources to learn about the technology behind our Mill & Scrubber Liners.