Sag Mill Pooling Issues

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pool formation, flow-back of pebbles increases the quantity of critical size material in the mill. The amount of pebbles passing through the grate increases with the angle of the grate. A DEM simulation of this scenario for a 36 ft diameter SAG mill is shown in Figure 5. The inefficient usage of energy due to the flow back phenomena are ...

Slurry pooling and transport issues in SAG mills By M. S. Powell and W. Valery Topics: 091404 Mineral Processing/Beneficiation

Ausgrind program improvements include: Mill liner wear and life prediction for any liner/lifter design. SAG mill slurry pooling model to predict the onset and effect of slurry pooling for varying operating conditions. Grinding mill trajectory model to determine safe operating speed ranges based on liner/lifter design.

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All AG/SAG mills using radial or curved pulp lifters suffer from inherent material transport problems such as slurry and pebble pooling, which decrease throughput and increase energy consumption.

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Slurry pooling minimization in the OED Mill is facilitated by a novel grate-supporting spider. The Outotec spider design is conical and mounted to the discharge-end shell flange. This improves structural stiffness and ensures the mill is open all the way to the shell diameter.

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issues - or a dry charge caused by excessive slurry dilution and drainage through the grates. Table 2 contains operating scenarios and appropriate actions that should be taken by the operators or control systems to control a single stage AG or SAG mill. The guide should form the basis of any control philosophy. Table 2 GENERIC OPERATING GUIDE

Slurry pooling, excessive accumulation of slurry in the mill, and the associated loss of throughput and grind, are well recognised on low- aspect, single-stage SAG mills.

SAG Mill Comminution (" SMC ") testwork results confirm the Baptiste material is medium-hard from a SAG milling perspective. Across all phases of the mine life, Axb values are tightly-clustered in ...

Excessive pooling in the mill causes dilution of the slurry leading to reduced throughput and a coarser grind (Powell and Valery, 2006), and therefore influences the …

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The SAG mills have been mostly used for milling hard gold and copper ores with quartz, ultramafic or green stone as host rocks. The Bond work index of these ores ranges between 12 and 14 kWh/t. Subsequently, SAG mill application has been extended to softer ores, such as bauxite and clayey hard-capped gold ores.

By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the ...

SAG mill liner development draws primarily on practical experience from SAG milling operations supported by computer-based modeling of charge motion in SAG mills and on established good design practice. Liner design needs to respond to the process aspects of mill liner action that are critical to good SAG mill performance, i.e.,

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SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

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mill diameter, mill length, grates openings, and pebble ports size; the power equation is also function of all the operational variables selected for this study. The applied force is a function of the mass inside the mill and it is composed of balls, ore and water. The ball charge is a function of the bulk fraction of the SAG mill volume (Jb)

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SLURRY POOLING AND TRANSPORT ISSUES IN SAG MILLS The issues surrounding slurry pooling were highlighted by Morrell and co-workers, and the consequences are elucidated in a number of Malcolm Powell1 and Walter Valery2 publications, Latchireddi and Morrell (1997), Morrell et al. (1996, 2000).