Unlock SAG mill capacity with process control optimization

A stable SAG mill performance enables operations to push the limit to maximize throughput. Control strategy implementation In the above graph, the progress of a well-implemented control strategy is to change from an unstable, highly variable operation to a stable, optimized SAG mill with a responsive controller adapting to dynamic ore and

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SAG/Ball Mill Optimization KnowledgeScape

MillScanner is the ultimate tool for increasing SAG mill throughput and reliability. GrindingExpert™ isn’t just about SAG mills. Our GrindingExpert™ solutions include ball mill strategies that achieve the target grind size while maximizing throughput, or when the circuit is SAG mill limited, achieve the finest grind size possible, thus

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.

(PDF) Maximising SAG mill throughput at Porgera gold mine

Maximising SAG mill throughput at Porgera gold mine by optimising blast fragmentation

Maximising SAG mill throughput at Porgera gold mine by

Maximising SAG mill throughput at Porgera gold mine by optimising blast fragmentation By M. Lam, A. Jankovic, W. Valery and S. Kanchibotla Topics: EX

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 sound operators do not want to hear the sound of the mills standing still.

GrindingExpert™

size while maximizing throughput, or when the circuit is SAG mill limited, achieve the finest grind size possible, thus increasing mineral liberation and recovery. GrindingExpert™ has been shown to typically increase throughput by 3-6% GrindingExpert™. More Tonnage. Better Grinding

SAG Mill Grinding Circuit Design 911metallurgist

Difference Between Sag Mill vs Ball Mill mech4study

Oct 12, 2017· 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 pieces. 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.

(PDF) Maximising SAG mill throughput at Porgera gold mine

Maximising SAG mill throughput at Porgera gold mine by optimising blast fragmentation

Blast fragmentation for maximizing the SAG mill throughput

Blast fragmentation for maximizing the SAG mill throughput at Porgera Goldmine

Maximising SAG mill throughput at Porgera gold mine by

Maximising SAG mill throughput at Porgera gold mine by optimising blast fragmentation By M. Lam, A. Jankovic, W. Valery and S. Kanchibotla Topics: EX

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

Fruitful 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.

BATU HIJAU MILL THROUGHPUT OPTIMIZATION: MILLING

mill configuration setup in order to maximize the milling rate. The mill circuit configuration inthis case only includes SAG Mill Discharge Grates, SAG Trommel Screen and Pebble Screen aperturesizes . It also discusses the strategy used to mitigate throughput reductions post mill relines.

Leveraging unique expertise to maximize mill performance

Leveraging unique expertise to maximize mill performance SAG mill maintenance and relining is a field where finding and employing expertise pays dividends. As the engine of a mining operation, a SAG mill can process hundreds of thousands of tonnes of ore each day, grinding rock into suitable fractions that can be further processed to eventually

Mining comminution crusher, ball mill, and advanced

It’s not uncommon for a large mine to have independent planners looking after blasting, primary crusher throughput, secondary and ball mill grinding as well as the concentration plant. A single-minded focus by any of these groups to maximize throughput may come at the expense of other units, and ultimately at the expense of overall throughput.

SAG Mill Grinding Circuit Design 911metallurgist

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

Outotec® Open Ended Discharge Grinding Mill Outotec

The OED Mill has been designed to maximize slurry transport and minimize slurry pooling. This increases throughput capacity and improves grinding efficiency due to increased impact energy. Slurry pooling minimization in the OED Mill is facilitated by a novel grate-supporting spider.

GRINDING: ABB commissions six gearless mill drives at

Oct 29, 2019· “Gearless mill drives are the ‘workhorses’ for grinding operations which are at the heart of any mine. The six ABB GMDs at the world class Cobre Panama project are extremely robust. As the ore extraction pace indicates they are maximizing throughput,” said Rene Chacon, project manager at ABB for Cobre Panama.

ARE SAG MILLS LOSING MARKET CONFIDENCE?

AG or SAG mills have been in use in comminution circuits since the 1950’s and are considered a mature technology in most countries. However, a reasonable number of recent SAG mill based projects have under-performed and not achieved throughput targets under their design conditions. This has resulted

SAG/Ball KnowledgeScape

Knowledgescape’s mill scanner is the ultimate tool for increasing SAG mill throughput and reliability. GrindingExpert™ isn’t just about SAG mills. Our GrindingExpert™ solutions include ball mill strategies that achieve the target grind size while maximizing throughput, or when the circuit is SAG mill limited, achieve the finest grind

Overload Detection in Semi-Autogenous Grinding: A

Jan 01, 2015· 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

Mining comminution crusher, ball mill, and advanced

It’s not uncommon for a large mine to have independent planners looking after blasting, primary crusher throughput, secondary and ball mill grinding as well as the concentration plant. A single-minded focus by any of these groups to maximize throughput may come at the expense of other units, and ultimately at the expense of overall throughput.

Outotec® Open Ended Discharge Grinding Mill Outotec

The OED Mill has been designed to maximize slurry transport and minimize slurry pooling. This increases throughput capacity and improves grinding efficiency due to increased impact energy. Slurry pooling minimization in the OED Mill is facilitated by a novel grate-supporting spider.

GRINDING: ABB commissions six gearless mill drives at

Oct 29, 2019· “Gearless mill drives are the ‘workhorses’ for grinding operations which are at the heart of any mine. The six ABB GMDs at the world class Cobre Panama project are extremely robust. As the ore extraction pace indicates they are maximizing throughput,” said Rene Chacon, project manager at ABB for Cobre Panama.

BATU HIJAU MILL THROUGHPUT OPTIMIZATION: MILLING

mill configuration setup in order to maximize the milling rate. The mill circuit configuration inthis case only includes SAG Mill Discharge Grates, SAG Trommel Screen and Pebble Screen aperturesizes . It also discusses the strategy used to mitigate throughput reductions post mill relines.

Multivariable Model Predictive Control of a Simulated SAG

Jan 01, 2009· 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.

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

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

Overload Detection in Semi-Autogenous Grinding: A

Jan 01, 2015· 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

ARE SAG MILLS LOSING MARKET CONFIDENCE?

AG or SAG mills have been in use in comminution circuits since the 1950’s and are considered a mature technology in most countries. However, a reasonable number of recent SAG mill based projects have under-performed and not achieved throughput targets under their design conditions. This has resulted

Starkey & Associates Inc. Leaders in Comminution Design

The SAG mill pinion energy is determined from the SAGDesign™ testwork results as follows : W SDT = revs (16,000 + m s)) (447.3 m s) where : W SDT = AG/SAG Specific Pinion Energy from a F 80 of 152.4 mm to a T 80 of 1.7 mm, kWh/ton ground revs = Cumulative number of SAG test mill revolutions to 80% passing 1.7mm m s = SAG mill feed sample

Mill Operators’ Conference 2018

For the SAG mill throughput performance evaluation, only shell liners and lifter profiles were used in the trajectory analysis to define the maximum operable speed ranges for the relative . 7 load fillings to minimise direct shell impacts. For SAG mill flow constraints, the discharge system design was

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

Maximising SAG mill throughput at Porgera gold mine by

As an example, Lam et al (2001) used to "mine to mill" concept to maximise the throughput of a SAG mill by adjusting the blast fragmentation. In general, the approach entails changing powder

Grindin' at the Mill investigating bottleneck in

Mill throughput is a key driver for maintaining profitability at Mt Keith because of the low head grade (~0.5% Ni) and inherently low nickel recoveries due to the mineralogical makeup of the ore. The Nickel West Mt Keith Concentrator (NMK) has 2 parallel grinding modules consisting of one SAG Mill and one BALL Mill per module.