sag mill efficiency

Choosing a SAG Mill to Achieve Design Performance - Starkey ...

and throughput drop when the optimum load limit is exceeded. Future work is expected to show a similar reduction in efficiency when exceeding optimum speed. Providing specified power by exceeding these optimum conditions is not adequate and leads to a lower cost but under- performing SAG mill. It is possible in some...

Read More

Mill (grinding) - Wikipedia

SAG mills are characterized by their large diameter and short length as compared to ball mills. The inside of the mill is lined with lifting plates to lift the material inside the mill, where it then falls off the plates onto the rest of the ore charge. SAG mills are primarily used at gold, copper and platinum mines with applications also...

Read More

Optimizing your SAG mill operation - International Mining

Mar 21, 2007 ... Sanjeev Latchireddi, Chief Process Engineer – Grinding Americas, Outokumpu Technology, looks at the shift from ball mills to SAG mills. Nowadays, the more successful plants are those that have adopted effective and efficient strategies to optimize their plant operation. As the 'heart of the plant' could be...

Read More

SAG Mill Grinding Circuit Design - 911 Metallurgist

Oct 1, 2017 ... AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the basis for a variety of circuit configurations. SAG circuits are common in the industry based on: High single-line capacities (leading to capital efficiency); The ability to mill a broad range of ore types in...

Read More

SAG Mills - Mining Technology | TechnoMine

Nov 5, 2007 ... SAG is an acronym for Semi-Autogenous Grinding, which means that it utilizes steel balls in addition to large rocks for grinding. The SAG mills use a minimal ball charge of 6 to 15%.

Read More

SAG Mill - Official Feed The Beast Wiki

Dec 6, 2017 ... Dark Steel Balls or Flint can be put in the processing slot (right side of the GUI, left of the process bar) to increase the efficiency and speed of the SAG Mill. Putting a Double-Layered Capacitor or Octadic Capacitor into the upgrade slot (in the bottom-left corner of the GUI) will increase the energy storage and...

Read More

Is There Hope for Energy Efficiency in Comminution?

Jun 8, 2016 ... www.cmic-ccim.org. SAG Mill – Ball Mill Circuit. • 62 concentrators in Canada. • 83% of ore processed in. SAG/Ball Mill Circuits. • Energy hogs. – 55,000 tpd gold mine consumes 38. MW of electricity for milling. • Ball Mill Energy Efficiency. – 0.2% based on new surface created. – 15-20% based on most.

Read More

IMPROVING ENERGY EFFICIENCY VIA OPTIMIZED ... - OSTI.GOV

IMPROVING ENERGY EFFICIENCY VIA OPTIMIZED CHARGE. MOTION AND SLURRY FLOW IN PLANT SCALE SAG MILLS. ANNUAL REPORT. Reporting Period Start Date: 22 July 2003. Reporting Period End Date: 21 July 2004. Raj K Rajamani, Project Manager. Sanjeeva Latchireddi, Project Leader. Sravan K Prathy...

Read More

IMPROVING ENERGY EFFICIENCY VIA OPTIMIZED ... - OSTI.GOV

IMPROVING ENERGY EFFICIENCY VIA OPTIMIZED CHARGE. MOTION AND SLURRY FLOW IN PLANT SCALE SAG MILLS. FINAL TECHNICAL REPORT. Raj K Rajamani, Project Manager. April 2007. DOE Award number: DE-FC26-03NT41786. University of Utah. Department of Metallurgical Engineering. 135 S 1460 E...

Read More

SAG/Ball Mill Optimization | KnowledgeScape

Home | Plantwide Solutions | SAG/Ball | Flotation | Crush & Convey | Thickener | Froth Camera Systems | Conveyor Image Analysis Better efficiency, starts with better grinding. You've already gone through the work to bring the ore to the mill, now it's time to recover as much precious metal as possible. GrindingExpert™...

Read More

Gearless AG/SAG mills - Xinhai

Gearless AG/SAG mills. With the proven use of gearless drive technology, the limitation of AG/SAG mill size due to gearing constraints has been eliminated. Xinhai is the world's leading supplier of gearless AG/SAG mills. Very high drive efficiency & low maintenance requirements. AddThis Sharing Buttons. Share to...

Read More

Optimization of the single stage SAG mill circuit at the ... - Xinhai

single stage SAG mill at Minera Yanacocha's Gold Mill facility located in northern Peru. The Gold Mill was commissioned in March 2008 with a 32' x 32' EGL, 16.5MW single stage SAG mill, to process 5 million tonnes per .... media size plus interaction with discharge grates and classification efficiency. Figure 3 shows the...

Read More

Grinding Circuit Improvements at Evolution ... - SRK Consulting

a crush forward configuration of the SAG mill scats partial to full secondary crushing variable speed drive upgrade of the SAG mill. • lifter and grate design changes. • ball mill circuit grinding efficiency. This paper summarises the chronology of events that has resulted in significant improvements in throughput by conventional...

Read More

Optimize SAG Mill Wear Using DEM Simulation - - Rocky DEM

Mar 13, 2018 ... Stopping mill equipment is not a desirable alternative, so the best way to resolve SAG mill challenges is to use simulation technology for equipment design alterations. Replacing the SAG's .... These calculations are used to predict power draw, process throughput, and milling efficiency. (Details can be...

Read More

Modelling SAG milling power and specific energy consumption ...

Oct 7, 2014 ... important factors affecting the SAG mills performance. Some oper- ations have recognised an opportunity in the relationship between feed size and mill performance and manipulate feed size to obtain efficiency improvements (Morrell and Valery, 2001). The specific energy does not just depend on ore...

Read More

paper - ABB Group

motor efficiency. Since the gearless mill drive is typically by far the largest power consumer in a concentrator plant, the number of pole units should be kept to the minimum. The pole number varies typically from 48 for very small ball mills to 76 poles for the largest SAG mills. It is almost standard option to deliver the...

Read More

implementing strategies to improve mill capacity and efficiency ...

Recent advances in fine screening technology allow for the efficient classification of mill ... grinding mill would allow for more efficient operation of these grinding mills. .... Single Ball Mill. Figure 6. SAG Mill (semi-autogenous) followed by Secondary Ball Mill. Until recently, the majority of classifiers used in the closing of base...

Read More

Lessening impact to the bottom line — FLSmidth Discover Mining

Feb 17, 2016 ... A positive impact on mill performance. The new generation Impactmeter was released by FLSmidth in June 2015. It's a mill performance instrument that monitors the charge dynamics inside SAG mills and promotes equipment protection, increased milling efficiency and decreased operational costs.

Read More

technical memorandum - SAGMILLING.COM

Nov 11, 2015 ... crushing and single-stage ball milling circuit. Barratt, 1989, writes that a copper porphyry ore in a power-effi- cient circuit of SAG milling followed by ball milling should be 10% less efficient that the “maximum efficiency” grinding circuit (crushing, single-stage ball mill). Thus, the Etotal of a SAG and ball mill...

Read More

MEI Blog: Where are SAG mills going?

Aug 25, 2014 ... In our recent conversation, Prof. Alban Lynch was very sceptical about where semi-autogenous grinding (SAG) mills have gone, and thinks they have taken us along the wrong track. He feels that they may be attractive in terms of high productivity, but says that "their energy efficiency is poor, and I feel that...

Read More

Integrated advanced process control with a sag mill ... - FLSmidth

Impactmeter. The ECS/ProcessExpert system is an advanced process control solution used to stabilize and then optimize key minerals processes, so they can achieve maximum efficiency and higher profitability. The Impactmeter is an advanced SAG mill performance monitoring instrument that has been developed jointly by...

Read More

Milestones in Siemens Gearless Mill Drives

If the hours, days, months and years that all of these drives have been in operation are added up, the result is well over 500 years. Siemens engineers are able to draw on this experi- ence for further development efforts. The Gearless Mill Drives in Peñasquito's 38 ft SAG mill. A standard of reliability and efficiency...

Read More

STEINERT Global - Freeing up milling capacity in a SAG mill & ball ...

Jul 21, 2016 ... The throughput capacity and efficiency of a SAG mill are affected by the significant recirculated load derived from over-size discharge product (critical size 'pebble” discharge) that is screened out and may be stockpiled or requires secondary crushing prior to re-introduction to the SAG mill feed. Where the...

Read More

Ring gear drives huge grinding mill | Machine Design

With inside dimensions of 36-ft diam. and 19-ft long, this semi-autogenous grinding mill (SAG — see next section) will use a 43-ft diam. ring-gear drive to transmit 18,000 hp and handle up to 3,000 metric tons of .... Also, ring-gear and pinion tooth surfaces are machined to a high AGMA Quality level to enhance efficiency.

Read More

Mount Carlton SAG Mill Optimisation | Slavica Ciffolilli | Pulse ...

Jul 26, 2017 ... The smaller ball diameter reduced impact breakage, allowing the mill to operate at higher speed and under more autogenous conditions. This increased efficiency and utilised more installed SAG mill power. The cyclone operation was changed to constant pressure and the vortex finder size was decreased...

Read More

Impact Load Behavior between Different Charge and Lifter in ... - MDPI

Jul 31, 2017 ... Abstract: The impact behavior between the charge and lifter has significant effect to address the mill processing, and is ... impact of milling efficiency, the efficient operation of mill working parameters is a critical issue. Materials ...... of rock size and shape distributions in AG and SAG mills using DEM. Miner.

Read More

BALL MILL AND HPGR - Open Collections - University of British ...

In the past 20 years, the energy-efficient comminution technologies, including high pressure grinding rolls (HPGR) and high speed stirred mill, have been developed and adopted in the hard-rock mining operation in ... focused on the energy and cost comparisons of the existing AG/SAG ball mill circuits with two proposed...

Read More

SAG/AG SCU - Millwatch

Mill availability remains one of the most significant markers of efficient mill operation, and a key performance indicator for many concentrator managers. ... requirement for people to enter the SAG mill during an inspection, reclaiming dozens of additional hours of mill availability and associated revenue each year, in addition...

Read More

Rubber spares for grinding mills, SAG mill spares, AG, ball mill spares

Naipu has successfully applied rubber liners, composite liners and rubber trommel screens in ball mills, SAG mills and AG mills, and has achieved significant tech breakthrough and innovation. ... Rubber End Plate. Rubber end plate can be used to increase the efficiency of grinding applied on AG / SAG mill, and ball mills.

Read More

The Selection Design and Application of Mill Liners for Large Wet ...

Specialist Services. Liners and Lifters. > Protect the outer shell of the mill from wear and damage. > Enhance the efficiency of the grinding process. > Need to be replaced regularly. > Steel liners advantages. –. Cope with variety ores. –. Superior large AG/SAG, ball mills. –. Robust application. > Rubber liners advantages.

Read More

SAG Mill - Mining engineering - Eng-Tips

At another web site someone asked about modeling a SAG Mill. Not knowing what this was I googled it-a rotating rock crusher. What struck me was that the rock crushing seems to be about 5% efficient. Dosen't this beg for a new solution with a much higher efficiency?

Read More

SAG Mill Operation at Cortez: Evolution of Liner Design from Current ...

ABSTRACT. The Cortez SAG mill liner design was recently modified to improve the mill operating energy efficiency. In addition to the expected benefits, the design change unexpectedly played a significant role of verifying the proposed grinding circuit expansion for the Cortez Hills project as well as illustrating current SAG...

Read More

US20070180678A1 - Robot system and method for bolt removal ...

At present, the removal of the bolts which fasten the liners should be carried out manually as part of the maintenance procedure SAG mills should be subjected to. The disadvantage of this procedure is the fact it should be carried out manually which makes the system to lose efficiency due to the high maintenance periods.

Read More

Over 80 comminution and minerals processing publications by Dr ...

MORRELL, S., 2008, A method for predicting the specific energy requirement of comminution circuits and assessing their energy utilisation efficiency, Minerals Engineering, Vol. 21, No. 3. 7. MORRELL, S., 2007. The Effect of Aspect Ratio on the Grinding Efficiency of Open and Closed Circuit AG/SAG Mills. Proc. Ninth Mill...

Read More

Grinding Machine

The 36 ft. diameter semi-autogenous grinding (SAG) mill SAG Mill pictured to the right smashes up to 55,000 tons of granite ore per day and doing so its twin 6000 horsepower electri c motors consume almost 9 megawatts of power - equivalent to 10 percent of all the electricity used in Fairbanks. From cement, to copper and...

Read More

effects of pool volume on wet milling efficiency - Core

2.7 Interrelation net power draw and milling efficiency. 85 ... 191. Chapter 6 Modelling the effects of pool volume on the kinetics and efficiency of milling. 192. 6.1 Introduction. 193. 6.2 Models and characterisation of ball milling. 194 .... 2.26 DEM-SPH simulation of slurry distribution in the load of a SAG mill for 100.

Read More

Sentinel: Siemens Gearless Mill Drives - YouTube

Jan 19, 2016 ... The mills at Sentinel in Zambia are amongst the world's biggest, with 2 off 40 ft SAG mills complete with 28 MW drives, and 2 off 28 foot-ball mills with 22 MW drives. For mines of this size, reliable, high efficiency mills are top priority. Siemens Gearless Mill Drives result in reduced total costs and assure a...

Read More

Overload Detection in Semi-Autogenous Grinding: A Nonlinear ...

mill rotates. The primary objective for a SAG mill is to maximize the throughput of fresh ore. Fresh feed rate, however, is constrained by the total volume occupied by the charge inside the mill (Craig & Macleod, 1995). If the charge volume exceeds a certain threshold, the mill begins to overload and grinding efficiency...

Read More

AG & SAG Mill Liners - Energy Business Review

The emphasis on liner design to ensure efficient mill operation has grown, particularly as mills have increased in size. The extent to which a liner effectively protects the mill, imparts energy and controls the mill charge, impacts on the total ownership costs for plant owners and operators. In general, the harder the material fed...

Read More

Outotec presents the world's largest SAG mill - Outotec

With the development of the world's largest SAG mill, Ø40'x29', Outotec responds to the need by offering increased efficiency, effective grinding conditions and improved mill capacity up to 15% with reduced energy consumption. Outotec has recently been awarded a contract to deliver one of the largest grinding mills in the...

Read More
PRE Post:fluorite beneficiation process safe and reliable
NEXT Post:diy silica ore wet ball mill