Autogenous mills, or AG mills, 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, AG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.
In comparison to grinding with steel rods or balls, autogenous grinding has the following advantages: the crushing of the ore before milling is simplified and made less expensive, the expenditure of steel rods or balls is eliminated or reduced, and the technological efficiency for the concentration of some ores is improved as a result of less overgrinding of a valuable mineral.
The Barmac Autogenous Crushing Mill is a machine which combines impact crushing, high intensity grinding, and multi particle pulverizing. As such, it is best suited in the third crushing stage or as the first stage of a milling process.
Autogenous grinding has two advantages, it reduces metal wear and eliminates secondary and tertiary crushing stages. Thus it offers a savings in capital and operating costs. Autogenous mills are available for both wet and dry grinding. The diameter of autogenous mills is normally two to three times the length.
This autogenous crushing action offers the lowest possible cost/tonne of any impact crushing method. The high velocity impact crushing achieved in a Barmac VSI improves the soundness and shape of the material. A comprehensive range of IC intelligent automation solutions is also available for crushers.
SAG is an acronym for semi autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 4239; in diameter, powered by a 28 MW motor.
Table of Contents Autogenous Grinding CircuitsSAG vs Ball Mill AdvantagesAG amp; SAG Mill Grinding Compared Which is BestTesting for Product SizePrimary Autogenous Grinding Concentrators Recent Trends and DevelopmentsAutogenous Mill TypesPrimary Autogenous MillsWet Versus Dry Primary GrindingBasic Plant FlowsheetBasic Primary Grinding Flowsheets Size reduction is the most expensive operation ...