Using DEM to model ore breakage within a pilot …
Using DEM to model ore breakage within a pilot scale SAG mill. Paul Cleary. 2004, Minerals Engineering. See Full PDF Download PDF. See Full PDF Download PDF. Related Papers. Minerals Engineering. …
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Pre-Processing to Increase the Capacity of SAG Mill …
From the stockpile, the ore is reclaimed and transferred to the 11.6 m diameter (38′) by 7.0 m length (19′) single SAG mill equipped with a 20 MW electric motor. The SAG mill product flows to two 3.6 m (12′) by 7.3 m (24′) horizontal screens, whose combined oversize (pebbles) is diverted to two MP 800 cone crushers.
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Prediction of slurry grinding due to media and coarse rock interactions
A coupled DEM + SPH model can be used to predict the motion and breakage of resolved coarser particles within a SAG mill. The fine product from coarse particle fracture can then be included in the slurry phase modelled using SPH. This allows, in principle, the prediction of the breakage and transport of coarser material and the …
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Predicting breakage and the evolution of rock size and …
Highlights Particle size reduction in tumbling mills results from five different mechanisms. Incremental damage is the dominant mechanism for SAG operation. Incremental breakage progeny are indistinguishable from those of single impacts. DEM prediction of abrasive size reduction is qualitatively accurate for AG mills. DEM …
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Quantifying variability of ore breakage by impact
The extended DWT breakage testing approach was conducted over a broader range of input energies to determine breakage percentile curves for the tested samples. One aim of this work is to investigate how breakage variability may affect SAG mill performance through running several simulations using the JKSimMet software.
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Operation Analysis of a SAG Mill under Different Conditions …
DOI: 10.3390/en13205247 Corpus ID: 225154922; Operation Analysis of a SAG Mill under Different Conditions Based on DEM and Breakage Energy Method @article{Xie2020OperationAO, title={Operation Analysis of a SAG Mill under Different Conditions Based on DEM and Breakage Energy Method}, author={Qiyue Xie and …
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Energies | Free Full-Text | Operation Analysis of a SAG Mill …
First, we built a three-dimensional model of the SAG mill. Then, we used the breakage energy method to set up two sets of simulation schemes to simulate the influence of the mill speed, the fill level ratio, and the steel ball ratio on the SAG mill. Finally, through statistics and analysis of particle information and mill power under different ...
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Minding the Grind: Maintenance Options to Keep SAG Mills …
Of particular interest is that Rocky DEM (named for its origins in rock breakage studies) has multi-GPU processing capabilities that can handle large particle counts for quick, accurate prediction of process or equipment performance. ... When SAG mill liner bolts loosen, break or stretch beyond limits, liner impairment and degraded performance ...
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AG and SAG Mill Circuit Selection and Design by …
In SAG mills running with higher ball charges, the rock component of the grinding media plays a lesser role in dictating the breakage rate and contributes more to the rock 'burden' which
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Multi-component AG/SAG mill model
The grinding media of autogenous mills derive from the feed ore size and composition (Delboni and Morrell, 1996) and the varying ratio of different components in the mill feed affects the mill charge and consequently the whole breakage process. after developing a new AG/SAG mill model that describes the influence of mill charge …
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Comparison of Ore Hardness Measurements for …
soft, the Rod Mill Wi is probably irrelevant in determining required power for the SAG mill. Drop Weight Tests Drop Weight tests were done at Hazen and analyzed by Contract Support Services, Inc. Table 4: Summary of 6 JKTech Drop Weight Tests JKSimMet Parameters By 12 3456Avg of 6 A (maximum breakage) CSS 42.5 63.5 68.1 …
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DESIGN OF AG/SAG MILL CIRCUITS USING THE SMC TEST
A rock breakage test has been developed that can help predict autogenous (AG) and semi-autogenous (SAG) mill performance in situations where only limited quantities of rock samples are available.
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Quantifying Variability of Ore Breakage by Impact
Request PDF | Quantifying Variability of Ore Breakage by Impact – Implications for SAG Mill Performance | The standard JK drop weight test breaks single particles at five size fractions each at ...
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Experimental study of ore characterisation methods for AG/SAG mills
The key comminution mechanisms involved for a SAG mill are: (1) incremental breakage where parent particles break into progeny based on the cumulative energy absorption above the elastic damage ...
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Inclusion of incremental damage breakage of particles …
Coupled DEM+SPH models are able to predict the motion of the coarse particulates and the slurry phase in a SAG mill. An extension of this model is proposed in which breakage of coarser particles (which are resolved in the DEM sub-model) in accordance with the incremental damage theory is included. This allows direct prediction …
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Multi-component AG/SAG mill model
The breakage rate distributions are affected by a number of operating conditions. Morrell and Morrison (1996) modelled the effect of ball charge, mill filling, feed size distribution and mill speed on each breakage rate. The resulting 5 empirical equations are embedded in the current JKSimMet Variable Rates AG/SAG model.
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SAG Mill Liners Breakage
The above comment should also include the liner metallurgy specification and grinding ball impact breakage indices. Improved SAG mill liner design also includes impact and …
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Advanced comminution modelling: Part 2
This is commonly considered to be the mechanism generating breakage in AG and SAG mills. Importance of models being full 3D. A large majority of DEM models simulating charge motion in tumbling mills (AG, SAG, ball) consider only a thin central slice of the mill. Such usage is valid for understanding the performance of the charge well …
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Dynamic modeling and simulation of a SAG mill-pebble …
The dynamic model of an AG/SAG mill includes several interlinked sub-process modules, and these modules can be updated individually. As shown in Fig. 1, the mill is divided into n sections, where m is the section number and q is the transported material. All sections have the same length, and each section contains a dataset of …
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(PDF) Optimization and performance of grinding circuits: the …
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 ...
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Autogenous and Semi-autogenous Grinding Circuits
Mechanisms of breakage. reakage:impact (crushing)at. itionabrasionAffects the coarse size class.Impact or crushing is typically the strongest breaka. mechanism in particle sizes …
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Using DEM to model ore breakage within a pilot scale SAG mill
The best accepted method for design of autogenous and semi-autogenous (AG/SAG) mills is to carry out pilot scale test work using a 1.8 m diameter by 0.6 m long pilot scale test mill.
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Operation Analysis of a SAG Mill under Different …
In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of the particles by controlling three ...
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EDEM Tutorial 4: Tavares Breakage for SAG Mill
EDEM Tutorial 4 - Tavares Breakage for SAG Mill_.zip. SAG Mill Breakage Tutorial Overview. A repetition of main simulation features. The simulation shows the breaking of …
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SMC Test® Minerals Processing Comminution Testing
The SMC Test® is the most widely-used comminution test in the world for AG & SAG Mills, HPGRs and Crushers. It is used to design comminution plants, optimize circuit performance, forecast throughput, ... The SMC Test® also generates the JK rock breakage parameters A, b, Axb and ta as well as the JK crusher model's t10-Ecs matrix, all of …
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Quantifying variability of ore breakage by impact – …
DOI: 10.1016/J.MINENG.2018.07.007 Corpus ID: 105824658; Quantifying variability of ore breakage by impact – Implications for SAG mill performance @article{Faramarzi2018QuantifyingVO, title={Quantifying variability of ore breakage by impact – Implications for SAG mill performance}, author={Farhad Faramarzi and …
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ITP Mining: Improving Energy Efficiency in SAG Mills
breakage and slurr y transport. However, the interaction between these variables is poorly understood in the industr y. Researchers from the University of Utah are developing a …
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SAG Mill Process Control
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 …
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SAG Mill Testing
SAG MILL TESTING - AN OVERVIEW OF THE TEST PROCEDURES AVAILABLE TO CHARACTERIZE ORE GRINDABILITY AUTHOR: F.O. VERRET, G. CHIASSON AND A. MCKEN - SGS KEYWORDS Comminution, grindability, grinding, SAG mill, AG mill, milling, HPGR, work index, pilot plant INTRODUCTION The resistance of ore samples to …
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Applying discrete element modelling to different modes of breakage …
Request PDF | On Jan 1, 2011, R. Morrison and others published Applying discrete element modelling to different modes of breakage in AG and SAG mills | Find, read and cite all the research you ...
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