A 35 decrease in the SAG mill power draw from 3 908 HP to 2 526 HP 2 915 kW to 1 884 kW was recorded This equates to a 47 decrease in SAG unit energy consumption from 8 98 kWh/ton to 4 74 kWh/ton A 11 decrease in SAG mill speed was observed indicating optimized ball strikes
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Mill operating conditions including mill speed for circuits with variable speed drives density and total mill load The effect of feed hardness is the most significant driver for AG/SAG performance with variations in ore hardness come variations in circuit throughput The effect of feed size is marked with both larger and finer feed sizes having a significant effect on throughput
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Yes you add load cells to existing SAG Mills it depends on the type of mill bearing support system They are normally button type compressive cells With Polysius mills they are integral in the Feed end bearing pedestals and provide a load signal out
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events The load cell package was successfully used to produce impact spectra in an 8 5 inch lab scale mill The mill speed and the ball size were varied to study their effect on the impact spectra A good correlation was found between the process variables and the impact spectra The load cell package was then used in a 16 inch pilot scale mill
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Abstract There are few methods of semi autogenous SAG mill power prediction in the full scale without using long experiments In this work the effects of different operating parameters such as feed moisture mass flowrate mill load cell mass SAG mill solid percentage inlet and outlet water to the SAG mill and work index are studied
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The plant feed is delivered to the 6 7 m 22 ft diameter by 2 1 m 7 ft long Hardinge primary SAG mill equipped with a 1 491 kW 2 000 hp drive motor A maximum ball charge of 15 is allowed in the mill to reduce the feed material to nominal 650 µm as feed to the secondary ball mill
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Pontt J MONSAG A new monitoring system for measuring the load filling of a SAG mill Miner Eng 2004 17 1143–1148 Google Scholar Cleary P Predicting charge motion power draw segregation and wear in ball mills using discrete element methods
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Corpus ID A model for dynamic and steady state simulation of autogenous and semi autogenous mills inproceedings Valery1998AMF title= A model for dynamic and steady state simulation of autogenous and semi autogenous mills author= W Valery year= 1998
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The load cell package was successfully used to produce impact spectra in an 8 5 inch lab scale mill The mill speed and the ball size were varied to study their effect on the impact spectra A good correlation was found between the process variables and the impact spectra The load cell package was then used in a 16 inch pilot scale mill
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pdf startling effect of ball scats removal on sag mill an increase of over 10 in mill throughput was achieved by removing the ball scats from a single stage sag mill these scats are non spherical ball fragments resulting from uneven wear of balls sag mills outotecsag milling extends itself to many applications due to the range of mill sizes available they can accomplish the same size
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SAG mill The SAG mill total load is currently held at about 25 volume 14 ball charge and 11 rock charge but has been as high as 32 has long been debated One of the objectives of a review carried out by Conveyor Dynamics Incorporated CDI was to confirm the correlation between SAG mill load and throughput using the MillStat program For
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The 142 SAG mill operations collected from Aq Darreh gold processing plant in the 32 km of north of Takab city in West Azarbayjan province Iran The variables of work index Kwh/ton mass flowrate t/hr feed moisture SAG mill solid percent mill load cell weight t and inlet m3/
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Modeling breakage rates in mills with impact energy spectra and ultra fast load cell data Minerals Engineering 24 3 4 21 Van Drunick W I and Moys M H 2003 Online process modelling for SAG mill control using temperature measurements energy balancing and inferential parameter estimation In Proceedings of IMPC
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SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill The best way to measure load is to mount the mill on load cells The load cells are calibrated to measure the total weight of water grinding media balls and ore in the mill but not the weight of the mill itself While many mills today are mounted on load cells
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AG/SAG mill is inefficient in grinding particles of a certain size typically in the range of 25 55 mm i e pebbles 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 performance of the primary grinding circuits
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Dry crushed ore at P80 90 mm is fed to the SAG mill 5 5 m internal diameter by 2 7 m effective grinding length by means of a conveyor belt equipped with a load cell type belt weightometer The load signal controls the feed rate from the mill feed bin discharge conveyor onto the conveyor belt feeding the SAG mill
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Load Cells from Variohm Variohm can offer a comprehensive range of load cells from our suppliers Zemic and Vishay Popular applications for load cells include on board weighing systems and platform scales Our load cell categories include Single point load cells
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The testing of the load cell on the ultra fast load cell assembly was a key experiment in designing the wireless circuit The test worked showed that the load cell registered a peak force value upon a single impact within 100 microseconds Since the impacts on the load
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The load cell package was successfully used to produce impact spectra in an 8 5 inch lab scale mill The mill speed and the ball size were varied to study their effect on the impact spectra A good correlation was found between the process variables and the impact spectra The load cell package was then used in a 16 inch pilot scale mill
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Los Pelambres as at many mines SAG mill throughput was limiting overall production CONTROL OBJECTIVES Maintain the desired mill load ensuring optimal mill operation Automatically account for changes in ore hardness Provide optimal compensation for pebble mill distur bances to minimize production disturbances
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The throughput and efficiency of a SAG mill depends on the volumetric load An overloaded mill has reduced coarse ore breakage as the cascading balls and rock cannot drop far enough reducing kinetic energy for breakage An underloaded mill will break coarse ore well but at the expense of added grinding ball consumption and increased risk of
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Sag Mill Power Calculations Sag Mill Power Calculations sag mill power calculationsecapin power based sag mill design calculationsAutogenous mills semi autogenous mills and ball mills pdf mills using slide shoe bearings Since this time the design has been perfected based on the experience of more than 180 units operating all over the world in various industri
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Optimize performance and decrease disturbances in your mill The Outotec MillSense mill charge sensor system provides on line analysis of mill charge The system measures the mill rsquos toe angle with a wireless sensor attached to the liner bolt Together with Outotec s advanced process controls the
Get PriceOur load cells have set the standard for decades Whether it is analog or digital load cells single point load cells or bending beam load cellsit s your choice In addition we offer the right weighing electronics and matching accessories for your application
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At the Lihir Gold Mine the plant was utilizing mill s bearing pressure to calculate load measurement for the SAG mill in HGO1 The use of SAG mill weight for process control is additionally complicated at Lihir by compromised and suddenly drifting load cell and bearing pressure measurements on two of the process plant s three SAG mills
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There are few methods of semi autogenous SAG mill power prediction in the full scale without using long experiments In this work the effects of different operating parameters such as feed moisture mass flowrate mill load cell mass SAG mill solid percentage
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Process variables like bearing pressures or load cell measurement can be applied for better correlation 3 Actual application and resultsThe outlined method was applied in a 36 17 ft −15 000 HP 11 2 MW variable speed semiautogenous SAG mill for copper ore concentration with nominal throughput of 24 000 tons per day The mill is of the ring motor type driven by a cycoconverter
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Figure 2 Grindcurve for high aspect SAG mill Powell and Mainza 2006 9 Figure 3 Effect of mill speed on mill throughput Meaders and MacPherson 1964 10 Figure 4 Filling as a function of load cell reading for new and fully worn lifters van der
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Pontt J MONSAG A new monitoring system for measuring the load filling of a SAG mill Miner Eng 2004 17 1143–1148 Google Scholar Cleary P Predicting charge motion power draw segregation and wear in ball mills using discrete element methods
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SAG mill powerdraw kW SAG mill load cell t Cyclone feed water addition m 3/hr Cyclone feedrate m /hr Cyclone feed density solids w/w Oversize c rusher feedrate t/hr Ore is fed to the SAG mill for primary grinding The mill discharge is screened with the oversized material
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Jameson Cell installation was an innovative flowsheet change to removed load from cleaning circuit and increased plant capacity and decrease cleaner circuit frothing issues Aeration of Cleaner feed has improve performance and fines recovery and selectivity Jameson Cell has allowed the IsaMill to operate at Increase power to
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mill powerdraw kW kW and mill load cell weight LC t This example of a grinding circuit would be considered well insturmented according to the guidelines defined by Fuenzalida et al 1996 The available measurements are as follows 3SAG mill fresh stockpile feed t/hr SAG mill
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ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION SEMI Figure 5 8 Load cell package attached to the mill 47 Figure 5 9 Groove in the lifter 47 Figure 5 10 Stud cap exposed inside the mill 48 Figure 5 11 Comparison of Impact spectra with mill speed at 15 mill
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The SAG Mill is a block added by the EnderIO mod A machine similar to a Pulverizer or a Macerator is used to process resources to produce dust It accepts energy in the form of Redstone Flux or Minecraft Joule with an internal buffer of 100 000 RF and consumption of 20 RF per tick The energy storage capacity and processing speed can be increased by adding one of 3 tier of Capacitor into
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Liners and their associated lifter profiles have two main functions The first is to provide wear protection for the mill shell The second is to provide lift to the charge for the required size reduction Though generally accepted that liner design and wear has an impact on milling performance it has been difficult to quantify the influence of wear in a production environment as the effects
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