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.
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 …
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.
Figure 8 shows the behavior in a 66-lifter SAG mill, between 3-D DEM (non-breakage) models of a dry and wet (slurry) mill with new lifter shapes, and between a wet mill with new lifters and with worn lifters. Points of interest are: 1) comparing wet and dry mills with new lifters shows the slurry addition causes the charge to slump, 2) overall ...
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 …
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 …
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 ...
The 36′ SAG mill considered is a geometrically scaled-up version of the 1.8 m Hardinge pilot scale mill but with a longer belly length, reflecting current SAG mill design preferences. ... to incorporate explicit breakage of the resolved solids in the mill using an incremental damage model and the generation of resolved fragments from these ...
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 …
Here is a download link to a pre-build Excel file you can use in testing for with a Rotary Breakage Tester to obtain the data from which JKMRC uses to calculate A and b.
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
Mechanisms of breakage. reakage:impact (crushing)at. itionabrasionAffects the coarse size class.Impact or crushing is typically the strongest breaka. mechanism in particle sizes …
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 ...
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 ...
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 …
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 …
However recent DEM studies have suggested that breakage in AG/SAG mills is mainly due to low energy repetitive (or multiple) collisions rather than single high energy impacts. Hence a study was ...
When SAG mill liner bolts loosen, break or stretch beyond limits, liner impairment and degraded performance are generally next on the agenda, followed by mill stoppage for repair or replacement. Bolts and nuts — …
Ore Hardness Testing -SAG Mill Tonnage Estimation Method. ... the rod mill work index is a tumbling test that includes both attrition and abrasion breakage mechanisms. Unlike the ball mill work index, the size of the feed to a rod mill test (10 mm–12 mm) is closer to the size of the crushing test. ...
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.
DOI: 10.1016/J.MINENG.2018.08.021 Corpus ID: 105741186; Incremental damage and particle size reduction in a pilot SAG mill: DEM breakage method extension and validation @article{Cleary2018IncrementalDA, title={Incremental damage and particle size reduction in a pilot SAG mill: DEM breakage method extension and validation}, author={Paul W. …
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 …
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.
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 …
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 ...
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 …
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 …
ABSTRACT. This paper summarises some observations regarding the way SAG and AG mills work based on the last ten years of pilot plant operation, grinding circuit design and …
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 …
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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