WEBOct 1, 2018 · The impact of ore variability on process performance was observed at the OK Tedi mine in Papua New Guinea, where the variations in feed ore hardness (Bond work index 5–16 kWh/t) and in feed size distributions caused the SAG mill throughput to fluctuate between 700 and 3000 t/h (Sloan et al., 2001).
WEBIn this paper, the author presented a simple and sound approach to determining the preliminary SSSAG mill. aspect ratio. The approach is based on the concept of ball milling job to be done in a ...
WEBMar 1, 2004 · The successful appliion of modelling and simulation in design and optimisation rests heavily on having a model which is lifelike. In the case of autogenous (AG) and semiautogenous (SAG) mills this has provided a significant challenge to modellers, due in part to the interaction between feed characteristics and mill .
WEBSAG circuit being studied is shown in Fig. 11. ... in collaboration with JKMRC and Newcrest Mining Limited conducted an extensive study of the effect of liner wear on mill performance of a 32 foot ...
WEBBased on data from Koski et al. (2011) and Kock et al. (2015) a ball mill in a HPGRBall mill circuit will need about 20% more power than one in a SAGball mill circuit. ...
WEBOct 1, 2018 · A supervisory fuzzy expert controller is proposed to automatic control of SAG mill. • Proposed controller is installed and verified in an industrial SAG mill circuit. • Offline and Online tests are conducted to evaluate the performance of the controller. • Results showed increase in mill throughput and decrease in feeding fluctuations. •
WEBJul 14, 2016 · HPGRs produce a product with substantially more lines (for a given P80) than a crushing circuit. In this regard, the size distribution of an HPGR circuit is much more similar to the product of an SAG circuit than a conventional crushing circuit, reducing the amount of pow'er in the ballmill circuit required (relative to a crushing circuit).
WEBJan 1, 2015 · Tracking the mill performance showed that the mill power consumption decreased from to kWh/t (a nearly 30% reduction), P 80 of the mill product decreased from 611 to 355 μm, and the mill fresh feed flow rate increased from 511 to 521 t/h by decreasing the feed ore hardness from 112 min to 58 min based on SAG power .
WEBOct 25, 2023 · Aside from parameters fixed at design (mill dimensions, installed power, and the circuit type), the major variables affecting the SAG mill circuit performance, according to are related to: (1) ore hardness of the feed material, which plays a pivotal role in shaping the mill's performance; (2) distribution of feed particle sizes, which ...
WEBMay 1, 2018 · The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size distribution. However, these models are solved under steady approximation and do not provide any information on mill charge distribution in .
WEBJan 1, 2005 · Most aspects of SAG mill circuit design are well covered in the literature; however, the unit power requirement for SAG milling (both individually and as a fraction of the total circuit power) is worthy of additional discussion. ... while others have cited worse mill performance (Hart et al., 2001; Banini et al., 2004). Much of the benefit of ...
WEBFeb 1, 1994 · The circuit was performing poorly when originally surveyed. It was using considerably more power than would have been expected, even for a SAG mill based circuit. The factors which were contributing to this were the inappropriate choice of liner material in the SAG mill, and the fact that the circuit had been grossly oversized at the .
WEBAug 21, 2005 · The way that the DWi is correlated to HPGR performance and how it can be used in HPGR circuit design and performance forecasting is described in this paper, using data from a wide range of ore ...
WEBJul 1, 2022 · The performance and particle behavior of the SAG mill are greatly affected by rock shape [7, 9, 10, 18, 23, 24], DEM simulation with irregular rock particles can better reproduce the real working condition of the SAG this paper, four shapes of rock particles are adopted, and their shapes are spherical, cylindrical, cubic, and ellipsoid .
WEBWorking Principle of a SAG Mill. The rock and grinding media are placed in the mill and rotated, causing the grinding media to tumble and crush the rock into smaller pieces. The mill operates in a closed circuit with screens that size the ore and send it back to the mill for further grinding. The product from the mill is then sent to a cyclone ...
WEBMar 9, 2018 · A generalized SAG mill power draw equation developed by Austin, is given by: where the parameters used in the model are defined as: mp= net mill power (kW) K = a constant (kW/ton ) D = mill internal diameter (m) L = mill length (m) J = fractional volume of mill filled by total charge. εB = effective porosity of the total charge.
WEBJan 1, 2014 · The paper proposes a novel performance audit report for a SAG Mill Circuit. The audit report is demonstrated on a validated runofmine ore grinding circuit model, which the authors have captured ...
WEBMill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, or kPa for systems based on lubriion bearing back pressure, rather than .
WEBPerformance Characteristics And Optimisation Of The Fimiston (KCGM) SAG Mill Circuit. Relevant publiions from Dr Steve Morrell in the field of comminution. About. Technical Information. Dr Steve Morrell.
WEBSep 3, 2015 · When operating a grinding circuit (at Granny Smith) under a wide range of conditions: campaigning very competent underground ore followed by soft oxide, primary versus secondary crushed feed and finally singlestage SAG and conventional SAG, ball mill and pebble crusher (SABC) configurations. Economics changed and a review of the .
WEBSep 1, 2001 · Mill performance is usually evaluated in terms of throughput, specific . energy (kWh/t) and final grind size. ... (KCGM) SAG Mill Circuit". ISBN, SAG 1996, Mining and Mineral Process ...
WEBJan 1, 2010 · Kinross Parau and Metso Process Technology and Innovation (PTI) have reviewed and optimized the operating strategies for the SAG mill circuit at Parau operation in Brazil.
WEBAug 31, 2018 · The operation's comminution circuit, which comprises a semiautogenous (SAG) mill and two ball mills, each with 13 megawatts (MW) of installed power, was expected to be SAG mill limited when treating competent basement rock. ... predict circuit performance for varying ore characteristics and evaluate liner wear and predict the life .
WEBSep 23, 2006 · (36') high aspect ratio single stage SAG mill in closed circuit . with 508mm (20") Krebs hydrocyclone s. The SAG mill is powered by an ... The improved performance of the SAG mill after ...
WEBJan 1, 2012 · The comminution circuit at Tarkwa Gold Mine was commissioned as a Single Stage SAG mill operated in closed circuit with hydrocyclones designed to process 4Mtpa. The circuit was later expanded by adding a secondary ball mill in closed circuit with hydrocyclones with a view to treat 12Mtpa. The change in the circuit configuration and .
WEBPrinciple of SAG Mill operation SAG mill. SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' () in diameter, powered by a 28 MW (38,000 HP ...
WEBThe data were obtained from a sag mill circuit that was being fed by a stockpile which was drawing down. The sag mill feed conveyor was fitted with an onliner sizer using image analysis, whilst the stockpile had an ultrasonic indior which tracked its level down to a certain point below which excessive noise made further measurement inaccurate.
WEBHart et al (2001) reported a range of strategies for SAG mill capacity debottlenecking and improving overall performance of Cadia Hill comminution circuit one of which strategies was MinetoMill ...
WEBJan 1, 2016 · By combining with SAG discharge and screening on the SAG discharge screens, topsize control to the ballmill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebblecrushing circuit product to the ballmill sump for secondary milling; while convenient, this has the ...
WEBSep 20, 2015 · SAG mill compared to crusher and ball mill product size distributions (Powell et al 2014) SSE plot for a range of processing equipment Summary of circuit performance data from example mines
WEBMar 1, 2018 · Generic SAG mill geometry and operating conditions. SAG mills can have diameters up to m. A threedimensional slice of a generic intermediate size m diameter SAG mill is used here. ... (AG) is one the most important mineral processing assets in the comminution circuit, and its production performance directly impacts on .
WEBOct 20, 2015 · A group was recently discussing this by asking: I've tried to estimate AG/SAG Mill power requirements using several different methods: (1) Using the results of SMC data. (2) Using SAG Power Index (SPI) data. (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015)
WEBOct 18, 2020 · SAG mill circuit closed with a crusher after screening. Conveyor belts are assumed of fixed speed, so they are modelled as delays. Training process in which each episode is a run of the agent ...
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