Poly-Met Megaliner™Innovative liner concept - improves mill

availability and worker safety

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The Megaliner™ concept was developed to maximize mill availability and enhance worker safety during mill liner maintenance activities

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MegalinerTM

Application

• The Megaliner™ is suitable for large AG, SAG* and ball mills with large trunnions and where modern liner handlers are available

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* Will be officially launched in the second half of 2013

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MegalinerTM

Features

• Each liner covers a large area,up to 4 m2

• Light-weight in relation to size- 30-60% of metallic liners of

equivalent size

• Each element integrates multiple lifter and shell plate rows

• Minimum number of attachment points

• Bolts inserted and removed from the outside of the mill

• Guiding markers facilitate easy positioning and alignment

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MegalinerTM

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Maximized mill availability

Improved safety

Bolts are easy to remove and install

Safe and fast installation of new liners

Easy removal of worn liners

Main benefits

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Main benefitsMaximized mill availability

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• Downtime is reduced due to few liner components and an innovative attachment system which enables quick and easy installation and removal of liners

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15

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Poly-Met 38' x 45' AG Boliden Aitik, Sweden

Steel 40' SAG, Australia

Steel 38' SAG, Chile

Installation time for shell liners

Inst

alla

tion

time

min

/m2

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Main benefitsImproved safety

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• Attachment parts are insertedfrom the outside of the mill

• No need for the workers to bein the drop-zone of the linerswhile installing liner bolts

• Old liners can be stripped out and new liners installed by the operator of the liner handleracting alone

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Main benefitsEasy removal of worn liners

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• Tool for taking out the first rowof liners

• A lifting eye attached to one of the existing mounting holesenables safe and easy removalof the liner

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Main benefitsSafe and fast installation of new liners

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• Liners placed by the linerhandler operator acting alone

• Guiding markers facilitate easypositioning and alignment of liners

• New, patented liner positioningsystem uses camera technology

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Main benefitsBolts are quick and easy to install and remove

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• Attachment parts inserted fromthe outside of the mill only

• Attachment bolts are wellprotected against dust, corrosion or general mechanical damage

• The bolts are easy to remove

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Success case

• AG mill 38’ x 45’ grinding sulphide ore- Shell completely lined with Skega Poly-Met® Megaliners™ since 2010- FE lined with conventional Skega Poly-Met®, DE lined with metallic grates- Member of the Boliden AB Group, a leading copper and gold producer

Result: 30-40% shorter shell liner change out time with Skega Poly-Met® Megaliners™ compared to conventional liners. Safer replacement since nobody needs to be in the drop-zone of the liners while inserting or removing liner bolts.

Boliden Aitik Sweden

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Description

Feed end head lining:Wear life lifters inner/middle/outerWear life plates inner/middle/outer

24/12/6 months24/18/24 months

Wear life shell lining:Change out time shell lining (hours)

12 months54 hrs (454 m2)

Discharge end head lining:Wear life grates inner and outer 6 months

Power draw (MW) 15 MW

Liner positioning systemPatented

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The liner positioning system was developed to reduce reline timeand improve grinding circuit availability

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Liner positioning system

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• Using this system, the liner handler operator can act aloneto accurately position the liners without guidance from otherworkers

• Nobody other than the liner handler operator needs to be in the mill during liner installation

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Liner positioning system

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• Video cameras are magneticallymounted to the outside of the mill

• The cameras capture images through the bolt holes, and transmit those images in real time to a split screen display mounted in front of the liner handler operator

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Liner positioning system

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• Software corrects the orientation of the images so that the motions of the liner handler boom agree with whatthe operator views on the display

• Using the bolt holes in the millas targets, the operator simplyaligns the conical guides in the liners with the bolt holes in the mill

• Once the images coincide, the liner is in the correct position Operator screen view

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Liner positioning system

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The operatorhas full controlof linerpositioning

Increased mill availability

Data can be stored and used for installation statistics

Less damages on components and mill backing

Safer installations

Main benefits

Megaliner SAG millsInstallation pictures

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Megaliner SAG mills

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Megaliner SAG millsInstallation

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Megaliner SAG millsInstallation

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Megaliner SAG millsLiner positioning system

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