Semi-autogenous grinding mills (SAG mills)

Ideal for grinding run-of-mine rock or primary crusher discharge

Semi-autogenous mills or SAG mills, as they are often called, can accomplish the same size reduction work as two or three stages of crushing and screening. Often used in grinding at modern mineral processing plants, SAG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.

Lower lifetime cost

Simpler process requires lower capital and maintenance costs.

Versatile applications

Wide range of mill sizes available. Optimal for both dry and wet grinding.

Efficiency through automatic operation

Save power, grinding media, and linear wear while increasing capacity.

Innovative mill drive

Twice the power transmission with Metso Qdx4TM mill drive.

SAG mills for efficient dry and wet grinding

Lower lifetime cost

The range of mill sizes and versatile applications allow SAG milling to be accomplished with fewer lines than conventional set-ups. This, in turn, contributes to lower capital and maintenance costs for a SAG mill circuit. 

Versatile applications

SAG milling extends itself to many applications due to the range of mill sizes available. They can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill and some or all of the work done by a ball mill.

SAG mills are also an optimum solution for wet grinding since crushing and screening in these cases can be difficult, if not impossible. 

Efficiency through automatic operation

Metso’s process engineers will assist you in creating an efficient software-driven process, from circuit design to start-up and optimization, to ensure you get your desired grinding results.

Through automatic operation it is possible to save power, grinding media, and linear wear, while increasing capacity.

Innovative mill drive for twice the power transmission

Metso Qdx4TM mill drive provides the next step in the evolution of change in mill drive architecture, while allowing the system to be built with components that are within current manufacturing capabilities. We are essentially providing up to twice the power transmission of a conventional dual pinion drive.

Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing Metso to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW.

Today, Metso is the world leading supplier of gearless SAG mills operating globally.

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