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Improved particle size analysis enables finding the best particle size shape for the SAG mill feed The ore feeders are balanced using the particle size distribution shape as the controlled variable As such the bin or stockpile natural segregation is balanced properly using this online estimate

Chat Online### ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION

Depending on the mill size the SAG mills draws between 2 MW and 17 MW The product from the SAG mill is further reduced in size using pebble crushers and ball mills Hence typical gold or copper ore requires between 2 0 and 7 5 kWh per ton of energy to reduce the particle size

Chat Online### A Neural Network Model for SAG Mill ControlSGS

SAG specific power range of about 3 to 9 kWh/t for this site The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant short term segregation occurring under certain operating situations Depending on ore type and feed size distribution each SAG mill will process between 700 and 3000 tph

Chat Online### Gearless Mill DrivesABB

Antamina Compania Minera Antamina S A Peru Project One SAG Mill and 3 Ball Mill Drive Systems Capacity SAG Mill 1000 t/h Ball Mills 1000 t/h Consultant Bechtel USA Mill Builder FFE Minerals USA Mill Size SAG Mill 38 feet/11 58 m Ball Mills 24 feet/7 32 m Ore processed Copper/Zinc Drive Rating SAG Mill 20 1 MW 9 23 rpm Ball Mills 11 2 MW 11 38 rpm

Chat Online### BrainWave Control solutions for SAG mills

ensure that its 34 foot fixed speed SAG mill is properly loaded The copper molybdenum operation uses a total precrush strategy in which ore entering the mill has already been reduced to a size that is much smaller than typical for SAG mill feeds The benefit is that it allows the mill

Chat Online### Dynamic Modeling and Simulation of SAG Mill Circuits

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

Chat Online### Use of Radioactive Tracers to Support Mass Balances in

release size of the copper particles finally the flotation process Irradiated solid hydrocyclone underflow coarse ore from the SAG mill feed 2 5 nominal size and about 15 to 30 gram of mineral 15mCi of Na 24 reconciliation In addition the load distribution of the SAG product was employed to support the mass balances in

Chat Online### Improved Relationships for Discharge in SAG/AG Mills

of grate/pulp lifter design in AG/SAG mill discharge The current understanding from literature lacks knowledge of mill content size distribution and its effect on discharge through the grate at various aperture sizes and radial positions It also indicates that in on the grate is driven by the factors of ore filling radial position and

Chat Online### ChapterM MODELLING SIMULATION OPTIMIZATION

2 1 SAG mill modeling In MODSIM one of the simulation models used for a SAG mill unit is SAGT Semi Autogenous Grinding with Trommel model In this model a SAG mill with a trommel screen at mill discharge is modeled using the full population balance including particle attrition and

Chat Online### Industrial Solutions Autogenous ThyssenKrupp

Depending on the mill size the mill shell runs on two four or SAG mill with COMBIFLEX drive for gold ore grinding Ball mill with ring motor drive Brake of a ring motor drive 8 SAG and ball mill for the wet grinding of gold/copper ore

Chat Online### Ø Effect of SAG Mill Feed Size Distribution and Ore

foot diameter SAG mill was designed to treat 2065tph of monzonite ore at a ball charge of 8 volume total charge of 25 volume and an operating mill speed of 74 of critical

Chat Online### SAG Mill Optimization using Model Predictive Control

Control of SemiAutogenous Grinding SAG mill weight is an example of an important process that exhibits many of these aspects Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production Powell M S van der Westhuizen A P Mainza A N 2009

Chat Online### Major Mines Projects Sentinel Mine

Ore is recovered from the crushed ore stockpile by four apron feeders per mill located in a tunnel underneath the stockpile Milling pebble crushing The mills were selected on the basis of two milling trains each comprising the largest SAG and ball mills currently proven at other operations at

Chat Online### Optimizing Performance of SABC Comminution Circuit of

Minerals 2016 6 127 3 of 9 back to the SAG mill This causes a higher variation in the feed rate and particle size distribution in the feed to the SAG mill which results in a greater variation in the SAG mill power draw in the transition

Chat Online### Adriatic Metals plc Pre Feasibility Study Metallurgy and

The grinding circuit consists of a SAG mill ball mill and cyclones The grinding circuit will be designed to reduce ore from an 80 passing size of 76mm to 40µm The SAG mill will be a single pinion low aspect mill operating in a closed circuit The mill has an inside diameter of 3 8m and an effective grinding length EGL of 5 0m The mill

Chat Online### Estimated Water Requirements for the Conventional

water usage The crushed ore is transferred to a semiautogenous SAG mill or ball mill where the ore is further reduced in size Water is added to the ball mill in which a slurry that usually contains from about 20 to 55 percent solids is produced Singh 2010 International Mining 2011 see fig 2 The

Chat Online### SAG Mill Optimization using Model Predictive Control

Figure 3 SAG mill MPC control strategy The MPC SAG weight controller includes measured disturbance variables such as pebble recycle and ore size distribution as feed forward inputs to improve control of the SAG mill weight when changes to these variables occur The MPC control is able to maintain mill weight on target with less variability and avoid overloads without making excessive reductions to the ore feed rate This performance improvement enables the mill to operate closer to optimum grinding conditions As shown in Table 1 in each case the improved control with MPC demonstrated an average increase in mill production of 1 6 or more on several SAG mills at copper

Chat Online### Unlock SAG mill capacity with process control optimization

The traditional operation of SAG mills relies on the operator to adjust the manipulated variables to maintain the target mill load and power draw Changes to the ore hardness feed size or ore specific gravity require an alert operator to adjust the variables while

Chat Online### Modelling SAG milling power and specific energy

charge is a function of the bulk fraction of the SAG mill volume Jb occupied by balls the ore retained in the mill is the result of the volumetric ﬁlling which depends on the ore size distribution spe cially the 600 and the 600 100 on the rotational speed N/Nc and on the solid concentration by weight fraction inside the mill

Chat Online### Paper # 25Copper Mountain Overview on the Grinding

Table 1 includes the technical data for the Copper Mountain SAG mill Table 1general SAG mill data Specification Data Mill size 10 363 M 34 feet diameter by 6 096 M 20 feet long Mill type Wet grinding grate discharge Mill drive motor size 17 000 HP Mill drive motor type Synchronous 200 RPM Inside diameter 10 363 mm Length 6 096 mm

Chat Online### INCREASING SAG MILL CAPACITY AT THE COPPER

Copper Mountain s concentrator was commissioned in May 2011 The circuit consists of a 34 x 20 EGL SAG mill a Raptor 900 pebble crusher and two 24 x 39 6 ball mills Each mill is equipped with a 2 x 8500 HP dual pinion drive system The plant was designed to process 1585 mtph of SAG feed From startup the mill struggled to meet the required production rates Over time a major initiative that

Chat Online### A Neural Network Model for SAG Mill ControlSGS

to 130 minutes which translates to a SAG specific power range of about 3 to 9 kWh/t for this site The design of the ore stockpiling and conveying system contributes to fluctuating size distribution with significant short term segregation occurring under certain operating situations Depending on ore type and feed size distribution each SAG mill will process between 700 and 3000 tph The budgeted

Chat Online### Semi Autogenous Wet Grinding Modeling with CFD DEM

The object of the study is a semi autogenous grinding mill SAG 34 17 the diameter of the mill is 34 feet the length is 17 feet which processes charges of copper–nickel ores particle size distribution is The instability of the composition Figure 1 and the ore size lead to the instability of the size of the mill product The mass

Chat Online### ChapterM MODELLING SIMULATION OPTIMIZATION

2 1 SAG mill modeling In MODSIM one of the simulation models used for a SAG mill unit is SAGT Semi Autogenous Grinding with Trommel model In this model a SAG mill with a trommel screen at mill discharge is modeled using the full population balance including particle attrition and

Chat Online### Increasing SAG Mill capacity at the Copper Mountain Mine

Copper Mountain s concentrator was commissioned in May 2011 The circuit consists of a 34 x 20 EGL SAG mill a Raptor 900 pebble crusher and two 24 x 39 6 ball mills Each mill is equipped with a 2 x 8500 HP dual pinion drive system The plant was designed to process 1585 mtph of SAG feed

Chat Online### Evolution of SAG Mill Process Control at the Xstrata

Evolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1 Chief Engineer It was the combination of increased throughput targets associated with anticipated harder ore with finer grind requirements that finally pushed the decision to convert the primary mill to semi WipfragTM feed size distribution

Chat Online### Modelling SAG milling power and specific energy

The feed size distribution is also the implicit result of the ore competence affecting blasting and crushing performance This distribution affects the SAG mill load and the load affects directly the mill power and the efﬁciency of the mill operation Van Nierop and Moys 2001 If a SAG mill

Chat Online### AGAutogenous SAG Semi Autogenous Mill Design Calculations

The SAG mill was sized with 746 kW to give a 25 contingency for power swings on the calculated power The ball mill was sized at 1120 kW Total installed power for comminution exceeded that required for conventional grinding by a factor of 1 163 including secondary crushing

Chat Online### Ann Mason Copper Molybdenum Project NevadaMining

Ore from the mine will be initially crushed in a primary crusher stockpiled and sent to the semi autogenous grinding SAG mill through mill feed conveyors The SAG mill will comprise variable speed feeders plus mill feed size distribution measurement The Ann Mason concentrator is designed to handle 3Mt of ore a month The undersize from the

Chat Online### ARE SAG MILLS LOSING MARKET CONFIDENCE

AG/SAG mill based circuits and this has impacted on the ability of companies to obtain funding the throughput of copper concentrators is limited by one of the following principal the high primary crusher liner wear due to the excessive hardness and abrasiveness of the ore the uneven size distribution obtained from different feeders of

Chat Online### Dynamic Modeling and Simulation of SAG Mill Circuits

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

Chat Online### Optimization of a SAG Mill Energy System Integrating Rock

In this paper we present an application of an integrated model to size the PV BESS where the variability of ore grindability is modeled using geostatistical tools solar irradiance variability is captured using a Markov chain simulation model and the entire system is optimized through linear stochastic optimization considering a fixed mine schedule for the feed of a semiautogenous grinding SAG mill

Chat Online### InterMet International Metallurgical Consultants

Describe in detail SAG mill circuits of large scale plants and the benefits of each Grinding is one of the comminution stages where the mineral size is reduced to achieve a suitable particle size distribution curve for copper flotation As follows the purposes for executing a grinding stage Achieve a suitable release of the valuable ore

Chat Online### Optimization of SAG Mill Process Control at the Raglan Mine

Before the ore is processed by the SAG its size is analyzed by a Wipfrag camera that provides a granulometry estimate A cone crusher reduces the SAG s discharge screen s oversize material A 14 foot diameter ball mill ensures final grinding before the flotation stage Many control strategies were used at the SAG over the past few years

Chat Online### Modelling SAG milling power and specific energy

The ball charge is a function of the bulk fraction of the SAG mill volume Jb occupied by balls the ore retained in the mill is the result of the volumetric filling which depends on the ore size distribution specially the 6″ and the −6″ 1″ on the rotational speed N/Nc and on the solid concentration by weight fraction inside the mill which is a function of the solid concentration by weight fraction in the SAG mill

Chat Online### Characterization and Modeling of Semi Autogenous Mill

ORE SIZE DISTRIBUTION 2 1 SAG mills Semiautogenous grinding mills are currently one of the most widely used approaches in the field of mineral size reduction as a consequence of their comparative advantages such as higher processing capacity lower space requirements energy efficiency and lower investment and maintenance costs

Chat Online### OSTI GOV Technical Report Improving Energy Efficiency Via

Depending on the mill size the SAG mills draws between 2 MW and 17 MW The product from the SAG mill is further reduced in size using pebble crushers and ball mills Hence typical gold or copper ore requires between 2 0 and 7 5 kWh per ton of energy to reduce the particle size

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