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Figure 8 shows plots of Fi for impact breakage which were fitted to data obtained from a 6'*2' pilot ag/sag mill treating a very competent copper/gold ore. The figure shows the results together with the 95% confidence intervals from 2 extreme cases - ag and sag with 12% balls . The results are very encouraging in that the relationships are ...
AG/SAG mill test methodology which allows mill performance to be evaluated would lower costs, reduce material and time to gather the data required. Previous work using pilot scale AG/SAG mill tests with mills between 0.6 and 1.8m in diameter have shown that pilot scale tests can be used to successfully predict aspects of
Aug 06, 2015· Animation of the grinding action inside an AG Autogenous Grinding Mill. Like cloths tumble in a drying machine, rocks tumble on each other, .
PDF | On Sep 1, 2001, S. Morrell and others published Developments in AG / SAG mill modelling | Find, read and cite all the research you need on ResearchGate
1. Introduction. The main challenge of AG and SAG mills, which is one of the most important technologies in mineral processing industry in recent decades, is its operating time. The major reason of mill shut downs which lowers the mill availability is the time taken for replacement of .
considered AG/SAG grinding, even if it was not used in the final grinding circuit design. In the 1980s, many of the grinding plants that were built used FAG or SAG mills, and to decrease overall operating costs, many operators of older conventional milling plants considered and actually retrofitted their plants with AG/SAG mills.
5 Low ball charge SAG mill, high mill speed. (4% ball charge, 90% Nc) A cross between AG and SAG for competent, abrasive ores. As typically operated in RSA. 6 SAG mill (configurations 3, and 5 ) with recycle crusher Competent ores, better suited to coarse grind sizes as circulating loads can be high 7 SAG mills treating partially or fully
Typically, a SAG mill based circuit (P80 of 106 to 150 um) has media costs of around A$1/t. Providing the ore is amenable, the use of primary autogenous milling can
The fall-off in circuit capacity or feed rate per unit of length with the longer mill is clearly shown. The long mill is 1.83 times the length (or volume) of the short mill, but the increase in capacity of the long mill is only 1.34 or 1.56, depending upon whether the grate open .
size distributions in AG/SAG mills. The existing models and understanding of grate discharge and classification are known to be flawed and have been identified as one of the key limitations in AG/SAG modelling. The aim of this thesis is to improve on the current understanding of discharge in the SAG/AG .
Cleary P.W., Sinnott, M., and Morrison, R.D., 2006, "Prediction of slurry transport in SAG mills using SPH fluid flow in a dynamic DEM based porous media ...
Fig. 3 shows a similar relationship for the 1.8 m diameter by 0.6 m pilot mill (as shown in Fig. 1a)—treating a similar mill load size distribution to the 36 ft SAG mill. The scale factor between these mills would be expected to be [(1/0.6) × 11/1.8] 2.5 or 154 times the power draw. The power draw for a DEM mill can be estimated by summing ...
Every mining operation has a unique grinding process. has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.
Based on the analysis and understanding of the mechanism of slurry removal system in ag/sag mills operating with conventional pulp lifters, Latchireddi and Morrell, 1997a, Latchireddi and Morrell, in press-a, Latchireddi and Morrell, in press-b have summarized the slurry transportation process in grate discharge mills as shown in Fig. 2.
Amelunxen SGI Model. This is a model that estimates the specific energy consumption of a SAG or AG mill plus ball mill circuit using the equation by Amelunxen (2014) for E SAG and the classical Bond work index equation for E ball substituting CF ball in the place of the Rowland efficiency factors.. The model requires manual calibration factors for both equations (CF SAG and CF ball ...
and over-grinding of fine material. This paper uses a 1-way coupled DEM-SPH method in three dimensions to analyse the full slurry flow for a 1.8 m diameter by 0.6 m long AG/SAG pilot mill. This provides detailed information on the internal flow of slurry within a SAG mill, including the prediction of dry regions and of slurry pooling. The
Jan 01, 2009· 1. The SAG mill liner wear is subjected to the zero order kinetics model. 2. The comparison of the measured and modeled data of liner thickness, it was found that the proposed model could get a good fit to measured data. 3. The new model was proposed to make possible the SAG mill liner wear prediction at any given operating time. 4.
ABB's GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This 'workhorse' for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability .
The standard method for sizing secondary ball mills (usually the overflow type) in AG/SAG circuits follows published mill supplier information with aspect ratios in the range 1:1.5 to 1:2.0, depending upon product sizing and pulp flow, i.e., the highest expected circulating loads (Morrell, 2001). The applied net power, calculated from testwork
Influence of feed size on AG/SAG mill performance. SAG 2001, Vancouver, pp 203-214, Dept of Mining and Mineral Process Engineering, Univ of British Columbia. 41. MORRELL, S., VALERY, W., BANINI, G. and LATCHIREDDI, S. (2001). Developments in AG/SAG mill modelling. SAG 2001, Vancouver, pp 71-84, Dept of Mining and Mineral Process Engineering ...
SAG is an acronym for semi-autogenous 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' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m ...
approach the total specific energy of the entire AG/SAG circuit is ... the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a ... in this work, is presented in Fig. 1. Also shown are the main SAG mill .
single-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power. Ball mills Ball milling is the most common application for horizontal ... SAG and AG mills typically have grate discharge arrangements which can be either with or without trommel screens. SAG and AG mills .
grinding mill and AG/SAG mills. MILL MONITOR SYSTEM AND RECENT ENHANCEMENTS. The key features of the original prototype of a ruggedized continuous mill monitoring system were described in Campbell . et al (2006). A number of changes have subsequently been made to the various components of the mill monitor during evaluation of the prototype system.
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