Investigating Dynamic Behavior in SAG Mill Pebble …
This paper aims to investigate the dynamic behavior of an SAG mill pebble recycling circuit under varying feed ore conditions, focusing on both uncontrollable parameters (such as ore hardness) and controllable parameters …
(PDF) The-Morrell-Method-to-Determine-the-Efficiency-of …
with a classifying screen, K 2 = 1.19 for crushers operating in open circuit (e.g., pebble crusher in an AG/SAG circuit), M ic. is the crushing ore work index provided directly by the SMC T est ...
Trade-Off Realities in HPGR vs. SAG Milling—A Practical …
Pebbles are reclaimed from the bin via two belt feeders, each reporting to a pebble crusher. The pebble crushers are two parallel HP4 cone crushers fitted with 315 kW drives. Crushed pebbles are returned to the SAG mill feed conveyor. The SAG mill discharge screen undersize reports to the common mill discharge hopper, along with the ball mill
Ø Effect of SAG Mill Feed Size Distribution and Ore …
Ø The pebble recycle load was significantly lower than design (500tph compared to 700tph for design). Ø SAG mill efficiency was highly dependent on recycle crushing. Ø The SAG mill …
RECENT DEVELOPMENTS IN AG/SAG MILLING IN …
The effect of the pebble crusher is to increase ag/sag mill throughput considerably. An example of this clearly seen in Table 2. The data are from an ag mill grinding Pb/Zn ore and show that the
Addition of pebbles to a ball-mill to improve grinding …
Hard, moderately hard and medium hard ores (30 < A * b < 56) are conventionally processed in SAG-Ball mill-Crusher (SABC) circuits. The ball-mills in SABC circuits are operated at a relatively high speed (70–78% of critical speed), with large balls (50 mm to 80 mm), to cope with a coarse feed (a transfer size from the SAG mill typically ...
Product datasheet EXCEL™ Crusher liners for ® …
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 …
Ø Effect of SAG Mill Feed Size Distribution and Ore …
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
THE COMMINUTION CIRCUIT DESIGN FOR THE …
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 …
Design SAG mill production when you need it most: In …
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.
Incorporation of Pebble Crusher Specific Energy Measurements for …
This direct linear relationship between specific energy and crusher product size remained constant regardless of how the change in specific energy was generated, ie through changes to the crusher closed side setting (CSS), feed rate, liner profile or moisture content._x000D_ Key findings for the Telfer pebble crushing circuit were: each 0.1 kWh ...
Pebble Crusher Installation On A SAG Mill Circuit
Halyard designed a new system to incorporate a HP200 cone crusher, scats removal and pebble feed. This circuit had numerous special features that enabled the simultaneous reintroduction of 500,000 tons of pebbles alongside …
Optimizing Performance of SABC Comminution Circuit of the …
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.
THESIS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY
Paper B: Dynamic modeling and simulation of a SAG mill-pebble crusher circuit by controlling crusher operational parameters. Paper C: Dynamic modeling of a SAG mill – pebble crusher circuit by data-driven methods. Paper D: A data-driven method to isolate the effect of pebble recycling on SAG mill circuit.
Quantifying and improving the power efficiency of SAG
The circuits incorporating pebble crushing appear to be much more tolerant of changes in the physical characteristics of the feed than other circuit configurations. 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.
(PDF) FULL PRE-CRUSH TO SAG MILLS
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 ...
Pebble crushing or not?
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. ... it only predicts the power draw of the black box consisting of the SAG mill and pebble crushers combined. To get an accurate prediction of the pebble flow rate requires using population balance models (such as ...
5 reasons the ® HP cone crusher is the best …
Example case: Pebble crushing. Crushing of critical oversize from primary grinding mills (AG/SAG) has proven to be highly beneficial to a concentrator's overall throughput and operating costs. This difficult application is a fantastic case study of how the HP cone has maintained the best-in-class designation.
Optimizing Performance of SABC Comminution Circuit …
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.
Dynamic Modeling and Simulation of SAG Mill Circuits …
Therefore, cone crushers are often used as pebble crushers and integrated into AG/SAG mill circuits to break the critical size particles that accumulate in the mill and to increase the …
Pebble Crushing in SAG Mill Circuit
Based upon the full scale test results, fully autogenous grinding with pebble extraction and crushing can feasibly be incorporated into the existing primary grinding circuits at the National Steel Pellet Plant.
(PDF) Assessment of the Performance of Grinding Circuit for …
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 ...
Magnetic Separation Techniques to Improve Grinding …
• Pebble Crusher • SAG Mill Vibrating Screen Oversize • Ball Mill Discharge Technique/Equipment Solution − Suspended Electromagnet − Suspended Magnetic Drum − Trunnion Magnet Pebble Crusher Figures 3 and 4 shows the location of a suspended electromagnet over a pebble crusher conveyor. Fig. 1. Cone Crusher Mantle damaged by
Model:Morrell SS SAG
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 ...
Investigating Dynamic Behavior in SAG Mill Pebble …
The dynamics of milling circuits, particularly those involving Semi-Autogenous Grinding (SAG) mills, are not adequately studied, despite their critical importance in mineral processing. This paper aims to investigate the dynamic behavior of an SAG mill pebble recycling circuit under varying feed ore conditions, focusing on both uncontrollable parameters (such as …
HPGR
In many cases, the increased throughput of the SAG mill cannot be matched by the existing ball mill if a conventional pebble crusher is used. For this purpose, the HPGR offers the advantage that the HPGR's discharge contains …
Power-based modelling of single-stage AG and SAG mill …
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).
Optimisation of the Cadia Hill SAG mill 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.
FULL PRE-CRUSH TO SAG MILLS
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 ...
Crusher model
Pebble crusher, lightly loaded = 0.25 to 0.50; Tertiary crusher, choke fed (with a bin) = 0.75; ... Pebble crushing is considered part of the SAG mill for the purposes of power modelling in SAGMILLING. The crusher feed, product and closed side setting sizes are not used (nor estimated) as such parameters are internal to the SAG mill "black ...