maximizing throughput on sag mill

OUTOTEC MILLSENSE ONLINE MILL CHARGE SENSOR SYSTEM

semi-autogenous SAG mills need to be operated with the correct charge maximizing their throughput while avoiding overloading Outotec MillSense gives a precise indication of the mill charge volume The mill charge is calculated based on the online measurement for the toe position in the mill through...

Mill power draw models

The design of mill liners and SAG mill discharge grates will have a large effect on how efficiently the mill operates and the circuit throughput All models generally assume that a mill is fitted with efficient liners and that the grate design neither limits passage of pebbles and pulp nor permits re-circulation of pulp back into the mill...

PDF Influence of feed size on AG / SAG mill performance

The new practice of applying full pre-crushing of SAG mill feed to substantially increase throughput is challenged as retrogressive and inefficient at a time the industry desperately needs to...

Blast fragmentation for maximizing the SAG mill throughput

Request PDF Blast fragmentation for maximizing the SAG mill throughput at Porgera Goldmine The Porgera joint venture and Dyno Noble have commissioned a joint project to optimise the drill and...

Case Study Maximising SAC MIK Throughput through

New SAG processing mill requires very specific fragmentation size to maximize output Conventional mill also benefits from small consistent particle size Great depth of mine means steeper slopes which affect haul truck efficiency A key geological challenge is the lack of stability in...

Ball Mill Speed Vs Throughput

Objectives Of Crusher Throughput Optimization Batu hijau mill throughput optimization milling grade correlation the typical plant throughput rates are in the range of 3000 tph to 4500 tph for both grinding lines pebble crusher limited the overall grinding is circuit constrained by the pebble crushers and the sag mill and ball mill circuits have spare capacity...

INCREASING SAG MILL CAPACITY AT THE COPPER

Copper Mountain first feed to the SAG mill occurred in late May 2011 The circuit began ramp up in mid-June of that year with more consistent operating run times on the SAG and Ball mills Plant throughput in the first months was quite variable with throughput tonnage greater than 40 000 tons one day and less than 25 000 the next on some...

MillSense mill charge sensor system

The mill charge volume has a great impact on grinding efficiency For efficient grinding autogenous AG and semi-autogenous SAG mills need to be operated with the correct charge in order to maximize their throughput while avoiding overloading The Outotec MillSense sensor system gives a precise indication of the mill charge volume...

New Method for Controlling the Volumetric Filling

The measuring device with its PC-connections offers an excellent tool for controlling volumetric mill filling for maximizing throughput and for research purpose eg process studies mill linings design The paper describes the new method and the results achieved at Outokumpu s concentratorsINTRODUCTIONVarious methods have been developed for...

Optimization of mill performance by using

Optimization of mill performance by using online ball and pulp measurements Soon after a stop a mill is a dangerous place to enter for the personnel tasked with taking measurements or sampl Crash stops are difficult to handle The mill and all feed streams should be stopped simultaneously but often they are stopped around about the same time...

INCREASE THROUGHPUT REDUCE ERROR AND STABILIZE

mill circuits and SAG/Ball Mill circuits have often witnessed throughput increases from 5-6 and realised expert system utilisation higher than 90 for the time the grinding circuit was available for advanced control operation PRIMARY BALL MILL EXPERT STRATEGY A ball mill control strategy first determines the current state of a number of process...

BrainWave Control solutions for SAG mills

control the weight in the SAG mill to promote optimum grinding This strategy has been demonstrated to improve mill throughput by as much as 3 When copper prices are high producers look to increase production by eliminating process bottlenecks At Minera Los Pelam - bres as at many mines SAG mill through - put limits overall production...

Multivariable Model Predictive Control of a Simulated SAG

Jan 01 2009 0183 32 The optimizing level maximizes Power Draw using an online gradient estimation of the non-linear function between Power Draw and mill Hold Up The results show that is possible to operate the SAG Mill in the optimal zone compensate unmeasurable disturbances and maximize throughput without violating operational constraints...

Improving energy efficiency in comminution

Sep 27 2018 0183 32 In this case an AG or SAG mill may be appropriate For smaller throughput scenarios a three-stage crushing plus rod mill plus Vertimill may make the most sense It all depends on the ore...

PDF Maximising SAG mill throughput at Porgera gold mine

These models were MAXIMIZING SAG MILL THROUGHPUT AT PORGERA GOLD MINE linked and simulations performed to study the effect of blast BY OPTIMIZING BLAST FRAGMENTATION fragmentation on SAG mill throughput A modified blast design at a higher powder factor was selected to produce a finer feed to the primary crusher and SAG mill...

Throughput optimisation in milling circuits

SAG Mill Power SAG milling can be optimised to achieve maximum breakage and throughput or any other number of objectives The relationships between the key variables are highly non-linear and shift as the ore hardness steel load and liner conditions change...

Overload Detection in Semi

Jan 01 2015 0183 32 The primary objective for a SAG mill is to maximize the throughput of fresh ore Fresh feed ra e however is constrained by the total volume occupi by he charge inside the mill Craig Macleod 1995 If the charge volum exceeds a certain threshold the mill begins to overload and grinding efficiency decreases in a positive fee b ck mechanism...

Optimization of the Design of SAG Mill Internals Using

of SAG mill performance through 1 Changes in liner/lifter design to maximize throughput while maintaining acceptable wear levels 2 Changes in ball size to maximize particle breakage without producing exceptionally high impact forc 3 Changes in grate and pan lifter designs to decrease internal mill recycle and increase throughput...

Increasing Productivity Without Capital Expenditure

SAG mill throughput and energy consumption are non-linear functions of the mill volumetric charge At any given time the mill throughput can be maximized but as the weight for the SAG mill varies over time due to the liner wear the optimization must be repeated A model-based optimizer has...

Blast fragmentation for maximizing the SAG mill throughput

Blast fragmentation for maximizing the SAG mill throughput at Porgera Goldmine...

SAG Mill Liner

Based on experience mill liner designs have moved toward more open shell lifter volumetric capacity and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity Mill throughput is maximized with shell lifters between ratios of 25 1 and 50 1...

Increase throughput and capacity in SAG mills

SAG mills are the main workhorses in the majority of comminution circuits globally They need to be fed and kept working round the clock But challenges can arise when capacity is not optimised causing unnecessary downtime and liner wear leading to the one...

Implementation of a SAG grinding expert system at Barrick

autogenous SAG mill The primary objective was to maintain an on spec and stable grinding product to leaching while maximizing throughput This was achieved by leaching feed slurry while striving to maximize throughput Leach feed stability was achieved by standardizing operating practices across shifts a result of successful...

Maximizing profits with fragmentation analysis

12 increase in SAG mill throughput USD 75 million per month increase in revenue The Peruvian mines illustrate the benefits of using fragmentation analysis to inform the drill and blast process improving profitability from downstream activities like milling...

PDF Blast fragmentation for maximizing the SAG mill throughput

Throughput optimisation in milling circuits...

Autogenous and Semi

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach When future tonnage is to be increased the SAG Mill can feed downstream ball milling to boost capacity Fuller-Traylor SAG/AG Mills range in size from 43m through 122m in diameter with powers as high as 28 000 kW...

SAG Mill Comminution SMC Test SGS

SGS s comminution experts use the SAG Mill Comminution SMC test to characterize ore samples an important first step to grinding circuit design optimization and production forecasting Read more The SMC test is an abbreviated less expensive version of the JK Drop-weight test...

FL highlights potential throughput increase in SAG

Production capacity in the SAG mill is more often than not the constraining factor for an entire processing plant Improving the throughput of a mill by even a few percentage points can thus have a significant impact on the bottom line...

Difference Between Sag Mill vs Ball Mill

Oct 12 2017 0183 32 SAG mill make use of steel balls included with some large and hard rocks for grinding These mills utilize the balls in making the large fragments of materials broken into piec The ball charge of a SAG mill is about 9 to 20 This process takes place inside the large rotating drum of SAG mill which is filled with balls partially...

SAG Mill Grinding Circuit Design

Metallurgical ContentBall Charge Motion inside a SAG MillSAG Mill OperationSemi Autogenous Design FactorsSAG Mill Operation ExampleProcess Plant DescriptionSAG Mill Design and Specification Operating Problems Since CommissioningDesign Changes and Future Operating Strategies AG and SAG mills are now the primary unit operation for the majority of large grinding circuits and form the...