of parametric instability as described by the Mathieu equation, which has very different characteristics from "classical" resonance. GMD reliability investigation One of the problems uncovered by Anglo's GMD reliability investigation was a serious vibration on a 20 MW, 40 foot GMD on a SAG mill in Australia. This vibration delayed

SINGLE STAGE SAG/AG MILLING DESIGN Brian Putland1, Fred Kock1 & Leigh Siddall1 Orway Mineral Consultants WA Pty Ltd (OMC) Level 4, 1 Adelaide Terrace East Perth, Western Australia 6004 1 SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semi-autogenous / autogenous (S/AG) milling has become a common design for a variety of ore types with the advantages of being …

to the volumetric mill filling which influences grinding media wear rates, throughput, power draw, and product grind size from the circuit. Each of these performance parameters peaks at different filling values. In order to contin-uously optimize mill operation, it is vital to obtain regular measurements of the ball load and pulp position.

One of the key challenges in maintaining the stability of the process is size segregation in the COS which causes instability in SAG mill's performance. Therefore, the 3D dynamic model of stock which is developed in Julius Kruttschnitt Mineral Research Centre (JKMRC) is adapted to quantify the size segregation of the stockpile at Las Bambas ...

circumstances, SAG mill behavior becomes much more prone to instability, particularly at high speed (van der Westhuizen et al. 2006), where process dynamics may change dramatically.

Shop Technology Cutting Tools Blog Click image to enlarge by Don Graham. Spotting and preventing common insert failure modes . Through early insert examination, careful observation and reporting, shops can better determine the root causes of eight different types of insert failure modes: flank wear, cratering, build-up edge, chipping, thermal mechanical wear, edge deformation, notching …

SAG mill control on two sites in Australia that have adopted the new ... There are three major sources of dist urbances that produ ce instability in . ... This drop in feed rate can cause problems ...

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 ...

Probable Cause Material • Insufficient glass wet out with resin (dry glass) • Foreign objects/contamination (film, flash, etc.) in or on the charge • Wrinkles/pockets in discontinuous surface of SM charge pattern Process • Adding small SM pieces to charge pattern which trap air • …

Causes Of High Mill Weight In The Sag Mill. Crushers are used to reduce particle size enough so that the material can be processed into finer particles in a grinder.A typical processing line at a mine might consist of a crusher followed by a sag mill followed by a ball mill.In this context, the sag mill and ball mill.

Similar to the impeller design affecting pump capacity, the pulp lifter design affects the discharge capacity (or mill throughput) of AG and SAG grinding mills. Generally, the discharge from AG/SAG mills consists of one or both of the following components: slurry (water and finer particles) and pebbles (20-100 mm).

If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...

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The paper is illustrated by trend plots taken from a SAG mill in a major gold mine. The paper goes on to explain the practical causes of the instability ranging from inappropriate type 2 control strategies to poor control loop tuning and to inappropriate operator intervention caused by lack of operator training.