The cost of a ball mill conversion from overflow to grate discharge is 'fairly' affordable at $65,000 for a 13′ x 15′ mill. This is only for the discharge head, grates and pulp filters (rubber). A comparison in laboratory of Overflow Discharge Ball Mill VS Grate Discharge Ball Mill.
SAG MILL DISCHARGE SCREENS-TROMMEL vs. VIBRATING ... The SAG mill has a trommel on the discharge end of it. Oversize is returned to the mill by a bucket wheel and water jet. Trommel undersize was pumped to a vibrating screen where the ... the mill from the grates in the slot between the grates and the head. The oversize falls
A SAG mill is characterized by its large diameter and short length. It rotates, tumbling its contents violently, causing a breaking action. The mill is lined with wear resistant steel liners which are fitted with lifters to assist with raising the load. The liners are replaced as …
Slurry flow, including flow through the charge in the grinding chamber, through the discharge grates, along the pulp lifters and its discharge from the mill is an important contributor to the efficiency of the grinding process within a SAG mill.
Keywords: Grate, SAG-Mill, DEM-Simulation, Flow-back, Carry-over 1. Introduction Size reduction of ores has an important role in the process of obtaining various metals. For example, for copper the ore must be separated from the mineral and must reach sizes smaller than 50 m, and this
The pulp lifter is an integral component of autogenous (AG) and semi-autogenous (SAG) grinding mills as it controls the throughput, performance and efficiency of mills. The slurry transport from the AG/SAG mill through grate holes into the discharge trunnion is the main function of the pulp lifter.
Our grates are made of our special H79 high-strength steel which is tougher and harder than commonly used chrome-moly steels. Our grates made of H79 experience very little slot peening so mill throughput is not compromised. Proven high volume vendor Columbia Steel can provide all the castings required for a complete grinding mill reline.
•Close the SAG discharge grates from 0.75 to 0.5 inches. •Install a 1.5 mm screen in closed circuit with the SAG mill discharge to treat Sandy ore. •Speed up the SAG mill to 75% speed since only 56% of the available HP was being used. •Leave the 5/8" trommel, scats will stop when the grates are closed.
SAG Mill Liner Design. As a casting foundry, MGS Casting also has own SAG mill liner design. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered.
However, the curved design necessitates redrilling of the mill head and also requires curved grates, which can be quite complicated compared to a simple radial design. The best way to eliminate material problems is to use a grate, peripheral discharge trunnion supported mill or use a grate, open-ended discharge shell supported mill.
Overflow Versus Grate Discharge Ball Mills: An Experimental Investigation It has been widely accepted to go for grate discharge ball milling when a coarse product is preferred or to avoid production of extreme fines, but overflow discharge mills are preferred …
SAG MILLING IN AUSTRALIA – FOCUS ON THE FUTURE Greg S Lane Principal Process Engineer, GRD Minproc and ... • Use of DEM and CFD for optimising the design of mill liners, grates and pulp lifters • Innovative pulp lifter systems ... circuiting of the SAG mill and ball mill additions topping the list.
SAG mill throughput as a function of grate open area As shown in Figure 2 the grate open area has a strong effect on Sossego SAG mill throughput. The nominal capacity of the circuit should be achieved with a combination of 13.5% ball charge and 10.8% open area with 3 and 3.5 inch apertures. The mill is currently operating with 5.25 and 5.5 inch ...
Mining › AG/SAG Mill Liners › Rubber Grates. Rubber Grates. Polycorp specializes in the design and manufacture of High Pressure Moulded Wear Resistant Rubber Grates. These grates are manufactured with moulded rubber on a steel frame and chord reinforcement to provide strength and flexibility to resist pressure and localized impact of the grinding charge.
en A real-time monitoring system to monitor the wearing in the thickness of the ribs (5) of a grate (1) of a SAG mill (9) during the operation, having said grate (1 ) a screening surface (2) that includes a pulp lifter (3) and an external surface (7) that is not exposed to impacts, and also includes a central trough (6) where the supporting ...
SAG Mill Liner - Quality SAG Mill Liner on sale of chuteliner. Cement Mill Liner  Coal Mill Liner  SAG Mill Liner  .Pulp Lifter Liner for SAG Mills EB17005 Contact Supplier Discharge Grate Lin. ... A real-time monitoring system to monitor the wearing in the thickness of the ribs of a grate of a SAG mill. The grate can have a ...
discharge grates, along the pulp lifters and its discharge from the mill is an important contributor to the efficiency of the grinding process within a SAG mill. Poor transport of finer ground material can adversely affect grinding leading to excess energy consumption and over-grinding of fine material.
The SAG mill has a trommel on the discharge end of it Oversize is returned to the mill by a bucket wheel and water jet Trommel undersize was pumped to, the mill from the grates in the slot between the grates and the head The oversize falls » Learn More. UNUSED 38' x 25'5" SAG Mill 26,000HP, 22' x 36'5,
Jan 08, 2016· In this training module, we'll cover the workings of a semi-autogenous grinding mill, or SAG mill, that's designed to be the first stage of a grinding circuit. Ore that's crushed in a primary ...
8-3 Centrifugal force outward Fc mp& 2 Dm 2 (8.1) & is the angular velocity, mp is the mass of any particle (media or charge) in the mill and Dm is the diameter of the mill inside the liners. Gravitational force Fg mpg (8.2) The particle will remain against the wall if these two forces are in balance ie.
Increased production and energy efficiency for optimized Antamina mine. ... SAG mill grate design, SAG mill ball charge level, ball mill operating conditions, changes in classification with hydrocyclones, use and operation of recycle/pebble crushers were all considered and evaluated in the simulations.
SAG/ball mill circuit incorporating pebble crushers and a POLYCOM® high-pressure grinding roll. SAG and ball mill for gold ore grinding. One of three SAG mills with 9.75 m diameter and 2 x 4000 kW drive power. These mills operate in conjunction with ball mills for iron ore grinding in Iran.
Mar 02, 2010· As a result, mines have shifted their emphasis in optimization from ball mills to SAG mills. The rock load in the mill essentially depends on ore characteristics and the discharge rate of broken particles through the discharge end. The discharge rate depends on how efficiently the discharge pump (grate and pulp lifters) operates.
GRINDING MILL, BALL MILL, SAG MILL GRATES Designed for optimum fit. Our head liners, partition, and discharge grates are designed for efficient mill performance with reduced maintenance needs. Cast in martensitic chrome-moly steels with a 350 to 450 BHN hardness, Unicast grates are cast for high strength and optimum fit. DIAPHRAGM SCREENS
Grates & Screens Grinding Mill, Ball Mill, SAG Mill Grates. Designed for optimum fit. Our head liners, partition, and discharge grates are designed for efficient mill performance with reduced maintenance needs. Cast in martensitic chrome-moly steels with a 350 to 450 BHN hardness, Unicast grates are cast for high strength and optimum fit.