SAG Mill Measured power draw at VFD input kW 9,001 Power draw at pinion kW 8,214 Pebble Crusher Throughput, dry t/h 204.3 Pebble crusher feed, F 80 mm 60.2 Pebble crusher product, P 80 mm 18.6 Survey power draw kW 167 No load power kW ~75 Ball Mill Survey power draw at VFD input kW 13,055 Power draw at pinion kW 11,914
The current process configuration at the Huckleberry operation is based on a SAG mill operating with a pebble crusher and ball mills, commonly referred to as an SABC type comminution circuit (See Figure 1). Modeling of the SABC circuit using JKSimMet was carried out using known equipment parameters, operational data and the results of …
crushing of the SAG feed and diverted pebble crusher product to the ball mill. also Cadia in New South Wales has followed the pre-crushing circuit with a large HPGR to further reduce the SAG mill ...
The hypothesis put forward in this paper is that active control of the cone crusher's eccentric speed and closed side setting (CSS) can increase throughput and/or energy efficiency of the SAG circuit. To verify this hypothesis, a dynamic model of a SAG mill-pebble crusher circuit was implemented.
the SAG mill [5]. The pebble crusher had an over-powered configuration. The installed power draw of 630 kW (actual power draw of 213.5 kW) is over-sized and therefore had a low operation efficiency. The crusher remains operational intermittently, which means it is not possible to continuously Figure 1.
pebble crusher. This result enabled the customer to remove recirculating load from the pebble circuit and free up capacity in the SAG mill. This liner solution allowed the customer to increase the mill throughput by 3.5%, thereby significantly improving their overall plant production and profits.
Dynamic modeling and simulation of a SAG mill-pebble crusher circuit by controlling crusher operational parameters. 2018, Minerals Engineering. Citation Excerpt : This size class is known as critical size, typically in the range of 25–55 mm (Napier-Munn et al., 1996). To solve this problem, a cone crusher can be added to the circuit and it ...
Plant Concept SAG Circuit HPGR Circuit Equipment 1 x SAG Mill 9.8 MW 1 x Secondary Crusher 750 kW 1 x Pebble crusher 450 kW 1 x HPGR 4.0 MW 2 x Ball Mills 5.6 MW each 2 x Ball Mills 5.6 MW each Screens and conveyors 0.5 MW Screens and Conveyors 1.5 MW Total drive capacity installed 21.95 MW 17.45 MW
The single-stage autogenous grinding (AG) or semi-autogenous grinding (SAG) mill is a low-cost option for milling relatively low tonnages.
SAG mill screen deckThe SAG Mill discharge stream is frequently classified with a screen deck. The screen deck scalps the oversize material, which in turn is routed to the pebble crusher and back to the SAG mill feed. A new approach has been developed to magnetically collect ferrous grinding media from the screen oversize.
pebble crusher. AG and SAG mills are very efficient at making angular particles round. Crushers are very efficient at making round particles angular. So there is a potential synergy from passing hard, rounded pebbles from a AG or SAG mill to a dedicated pebble crusher. The crusher product returns to the AG/SAG mill for further grinding.
This paper examines the relations between the SAG mill and the pebble crusher in closed circuit while putting emphasis on controlling the pebble crusher in …
The uptake of Semi Autogenous Grinding (SAG) eliminated the need for crushing plants other than a primary crusher. The use of pebble milling has seen resurgence in the use of cone crushers ...
Furthermore, the SAG mill circuit indicated varying feed sizes (i.e. xF,80 =102 to 185 mm) which could be rectified by closer monitoring and control of ratios for the SAG mill feeders drawing the ...
•Primary SAG (or AG) in open circuit with pebble crusher. A simple and cost-effective circuit for a small mill that requires a fine grind is a single-stage SAG or AG mill (no …
Pebble crushing causes the transfer size in operating plants to coarsen. This means: Use a pebble crusher if the model is displaying transfer sizes at the coarse end of the range in the transfer size rules of thumb.
SAG with pebble crushing circuit: Morrell, 2004. SAG with pebble crushing circuit: Morrell, 2004. Circuits with a pebble crusher have an extra term to account for the pebble crusher specific energy, which requires an estimate of the pebble crusher F 80 (PEB, the size of the pebbles as µm) and the pebble crusher product P 80 (approximately the ...
The pebble crusher was available for 69% of the time during SAG mill operation. Power requirements dropped to 15 kWh/ton. In mid-April, a new problem emerged. Extreme wear problems became …
Dynamic modeling and simulation of a SAG mill-pebble crusher circuit by controlling crusher operational parameters. Haijie Li, Magnus Evertsson, Mats Lindqvist, Erik Hulthén, Gauti Asbjörnsson. Pages 98-104 View PDF. Article preview. select article Dry separation using a fluidized Sink-Hole.
Without a pebble crusher, the ball charge in the SAG mill is the main variable that the operator can use to influence the mill performance. The ball charge is used to enhance impact breakage in the mill. The ball charge is a difficult variable to alter quickly in an operating circuit and changes in ore type can result in an inappropriate ball ...
where: SGI is the SAG Grindability Index, minutes, P80 is the SAG hydrocyclone overflow 80% passing size, µm F80 is the milling circuit feed 80% passing size, µm, fSAG is a calibration parameter for pebble crushing and/or fine feed (typically 1.0 for 80% passing six inch mill feed and when no pebble crusher is present).
The results from this work show that significant dynamic impacts can be induced by altering the pebble crusher operational settings. Thus, the performance of a SAG closed circuit …
The pebble rate from the SAG mill rarely . matches the throughput capability of the crushers, and as the gap can . ... 1 Corrected for differences in Recycle Pebble Crusher Rates.
Pebble Crusher in Semi Autogenous Grinding ... No pebble ports in the grates (SAG circuit). b) Semi autogenous grinding in which the pebble fraction of mill discharge (+½ in.) is taken out through pebble ports for separate crushing and ball milling. The minus ½ in. fraction of mill discharge is recycled to the SAG mill through a classifier.
Li et al. implemented a dynamic AG/SAG model to control a pebble crusher and optimize the circuit throughput. In addition, due to the high hardness of pebbles, some engineers try to use pebbles as the …
SAG mill compared to crusher and ball mill product size distributions (Powell et al 2014) ... 20% of the material reports to the pebble crusher prior t o being recycled to the mill. The Damang ore ...
Transfer Size, T80: Is the 80% passing size of ore as it passes from the SAG mill to the ball mill. It is typically about 1/3 the size of the screen opening but can be coarser than 1/3, especially when a pebble crusher is used. Screening at 5 mm ensures that the T80 will be about 10 mesh (1.7 mm) ensuring that the ball mill will work efficiently.
Pebble Crushing. Previous. Next. The Bagdad mill, built in 1977, was designed for a mill capacity of 36,300 tpd. An ABC (Autogenous Mill-Ball Mill-Crusher) grinding circuit was chosen. The original mill contained three completely independent grinding circuits, each containing one 9.75 m diameter by 3.96 m long fixed speed …
Similarly, Li et al. (2018) simulated a SAG mill-pebble crusher circuit using the crushing model in Asbjörnsson et al. (2012) to investigate the effects of the CSS and eccentric speed ...
The circuit consists of a 60 x 113 primary crusher, two 16 MW SAG mills and two 16 MW ball mills. All four mills are twin pinion with wound rotor motor and gearbox drives. Provision for pebble crushing is provided for primary (hypogene) ore treatment later in mine life. The derivation of the mill's specific
The pebble crusher was reduced in size and the pebble bin capacity was increased to allow for a more consistent flow into the pebble crusher. Uncrushed pebbles were returned directly to the SAG mill, bypassing the pebble crusher, to further improve circuit efficiency.
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In the ON/OFF state (marked A and B), the pebble bypass gate sends either crushed or uncrushed pebbles back to the SAG mill when the pebble crusher feed bin level reaches a high and low level. Diverting of the uncrushed pebbles to the SAG mill results in the overshoots of the SAG load
Ø Manipulation of SAG Mill Operating Parameters (eg. load, ball charge, speed and density) Ø Maximising Pebble Recycle Load and Crusher Interaction With the SAG Mill I-12 Ø Effect of SAG Mill Feed Size Distribution and Ore Variability Ø Mill liner design modifications, and Ø Circuit Design Considerations That Influenced Throughput
