The design configuration and ongoing optimisation of SAG and Ball Mill Liner systems is extremely influential in the effective grinding of material prior to extraction.
When selecting a mill lining system, several key considerations must be taken into account.
There are numerous types of SAG and Ball Mill Liner designs including autogenous, semi-autogenous, ball, rod and scrubber mills.
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.
Type of milling process and operational parameters:
SAG and Ball Mill Liner 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 (typically ~300mm) 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.
SAG and Ball Mill Liner system serves two purposes:
Protect the mill shell from wear caused by the impact and abrasion of the mill charge, and to elevate and tumble the mill contents in the necessary manner to create a grinding action.
To achieve this, the mill liner profile must be constructed from high wear resistant materials and incorporate correct geometry to help determine the elevation of the mill charge and how the material is ground.
Eternal Bliss Alloy Casting & Forging Co, Ltd.
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