SAG means for Semi-Autogenous Grinding, which means which it utilizes steel balls in addition to big rocks for grinding. The SAG mills make use of a minimal ball charge of 6 to 15%. It provides a large diameter and short length. It rotates, tumbling its contents, creating a breaking action. The liner is created of wear and tear resistant steel and fitted with lifters, which assist in raising the load since the mill rotates. The strain includes dry ore, steel balls and water, which occupies 30% with the volume. 8% with this volume is steel balls.
The mill chute is continuously fresh ore and crushed until it is small adequate to pass through through the release grates. The feed rate of the mill depends on the horsepower accessible to show the mill and how much weight the mill shell can withstand, which can be dependent on the support supplied through the hydrostatic trunnion bearings.
Autogenous (AG) and Semi-Autogenous (SAG) grinding mills have observed increased application in large mineral processing operations in current years. They are rotating/tumbling mills by which comminution (size reduction) takes place without having grinding aids. Consisting of a huge diameter cylinder compared to their length (generally two or two.five to at least one) these mills use large lumps of ore since the grinding media. Autogenous mills use ore exclusively as his or her grinding media but if hardness and abrasiveness with the ore does not lend itself nicely to full AG milling then the small charge of steel balls (6 to 15%) is included with assist in proportions reduction. This really is called a Semi-Autogenous (SAG) mill. AG/SAG mills bring about size reduction with a mixture of impact, attrition and abrasion forces. Ore is swept up one side with the mill at a particular point it falls to impact the toe of the charge (bottom of mill). Ore particles within the body with the charge slide when moving to distinct heights and are put through attrition and abrasion forces. The inside liner of AG/SAG mills contains steel or rubber liners and therefore are fitted with lifter bars.
AG/SAG mills can accomplish exactly the same size reduction work that normally takes numerous stages of crushing, screening and grinding strategies which is the reason its reputation. Often the product may be finished size or prepared for final grinding in the ball mill or pebble mill. They can grind run-of-mine rock or primary crusher items making use of their feed size limited to what can practically be conveyed. Additionally they are able to be much less costly to operate with the reduction or elimation of pricey balls or rods.
