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ASARCO Milling

Every mining operation has a unique grinding process Metso has experience of over 8 000 grinding mills globally including manufacturing and delivering the largest SAG AG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up operation and optimization of your mill

Grinding Circuit - an overview ScienceDirect Topics

Choosing a SAG Mill To Achieve Design Performance John Starkey1 Principal Consulting Engineer Sami Hindstrom2 Manager Grinding Travis Orser2 Project Manager Grinding 1 Starkey Associates Grinding Design and Process Engineering 336 268 Lakeshore Rd E Oakville Ontario L6J 7S4

A Method of C alculating Autogenous Semi-Autogenous

Mar 02 2010· The type of mill discharge and the associated problems in both single stage and multi-stage circuits AG-Ball-Crusher ABC and SAG-Ball-Crusher SABC are briefly summarized in the table below Material transport Single stage AG SAG mills have to handle large amounts of slurry as they are generally in closed circuit with classifiers whose

Outotec presents the world s largest SAG mill - Outotec

ABB Completes On-Site SAG Mill Motor Rewind at Escondida Copper Wins Service Contract at Goro Nickel Project ABB recently announced that rewinding of a SAG mill stator at Chile s Minera Escondida—the world s largest copper mine—was successfully completed marking the first time in 40 years of gearless mill drive GMD history that the company has performed a stator rewind on-site

The Selection and Design of Mill Liners - MillTraj

some other 42 SAG mill projects Furthermore ABB has GMD designs ready for 44 diameter SAG mills with a rated power of up to 35 MW As well as ever larger SAG mills ball mills are also expanding in size In the late 1990s the trend moved towards using GMDs to power these larger ball mills as well as using the drive to vary the speed

Grinding mills - Metso

Understanding the effects of liner wear on SAG mill performance In the case of the large SAG mill referred to in Fig 1 the mill s initial volume is 757m 3 when new liners are

PDF Influence of feed size on AG SAG mill performance

Factory Supply Large Multi-alloy Mill Liners For Big Size Sag Mills Find Complete Details about Factory Supply Large Multi-alloy Mill Liners For Big Size Sag Mills Mill Liners For Sag Mills Large Multi-alloy Mill Liners Ball Mill Liners from Other Fabrication Services Supplier or Manufacturer-Chengde Rongmao Cast Steel Co Ltd

Preprint 13-050 - ceecthefuture org

grinding mills in the world The contract comprises the design and manufacture of a Ø40 x29 SAG mill The mill will be driven by a Gearless Motor Drive GMD which at 28 0MW is equal to the largest grinding mill power ever used in the mining industry The SAG mill design is based on Outotec s proprietary grinding

Ball mill preventive maintenance SAG mill AG mill

Aug 25 2014· Interesting as in a recent article in Mining Magazine July August 2014 pp 27 Kurt O Bryan of Weir Minerals says that although SAG mills have been around for over 40 years the demand to process more ore in less time is a key factor in where comminution trends are heading He says that SAG mills have to be bigger to meet these demands

Technical Program - SAG Conference

A typical SAG-HPGR-Ball mill circuit suggested by Patzelt et al 6 is shown in Figure 9 6 where the pebbles from the SAG mill are crushed in the high-pressure grinding rolls It is a general observation that SAG mills are helpful for grinding where wide variations in the grindability of ores are experienced

INNOVATION NEWS Mills and GMDs - ABB Ltd

Single stage AG SAG mills have to handle large amounts of slurry as they are generally in closed circuit with classifiers whose circulating loads reach as high as 400-500 The geometry of radial and curved pulp lifters is such that the slurry once passed through the grate into the pulp lifter will always be in contact with the grate until it

sag mill weight - Mine Equipments

Rod mills are limited in size to 2000 kW because the longest commercial grinding rod available is 6 m long For this reason rod mills are rarely selected in the present day environment of large AG SAG mills and large ball mills However it is necessary to discuss their operation because a Rod mill product has a similar slope to AG SAG mills

Difference Between Sag Mill vs Ball Mill - mech4study

A SAG mill is characterized by its large diameter and short length It rotates tumbling its contents violently causing a breaking action The mill is lined with wear resistant steel liners which are fitted with lifters to assist with raising the load The liners are replaced as …

Ring gear drives huge grinding mill Machine Design

Some dry autogenous mills operating in Canada are 8 5 m in diameter and 1 5 m in length These are known as Aerofall mills The Cadia Hill Australia wet SAG mill is 12 2 m in diameter with a 20 MW motor and in 2004 was the largest diameter mill in operation in the world

New Used Sag Mills for Sale Semi-Autogenous Grinding

Dec 12 2019· Recall a SAG mill is a mill type for the material grinding with a larger diameter than its length The steel grinding balls with large diameters from 100mm to 125mm and above are the grinding media in such mills As a rule the filling rate of SAG mills with grinding media is from 6 to 12

CONGA THE WORLD S FIRST 42 FOOT DIAMETER 28 MW …

The mill will be driven by a Gearless Motor Drive GMD which at 28 0MW is equal to the largest grinding mill power ever used in the mining industry The SAG mill design is based on Outotec s proprietary grinding mill technology developed over decades for maximum reliability and performance

ABB Completes On-Site SAG Mill Motor Rewind at Escondida

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

What s the Difference Between SAG Mill and Ball Mill

SAG mill conference provided details of the then largest gear drive in operation on a SAG mill 34ft x 18ft at Escondida 13 4MW which began operation in 1995 The reason for not having larger gear drives was due to the limitation of gear manufacturers not having access to larger single piece special alloy castings To the benefit of

SAG Mill - Semi-Autogenous Grinding Mill

Ball mill preventive maintenance PM It is a frequency work to maintain and repair ball mills AG mills and SAG mills The maintenance work influences the rotational speed and service life of ball mills In order to reduce downtime of ball mill regular examination and …

SAG Mill - Mining engineering - Eng-Tips

SAG MILLING IN AUSTRALIA FOCUS ON THE FUTURE Greg S Lane Principal Process Engineer GRD Minproc and It can be seen that the last five years has continued the trend to larger mills and that different circuiting of the SAG mill and ball mill additions topping the list

SAG mills choosing methods І SAG mills choosing based on

CONGA THE WORLD S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL ABSTRACT In 2010 Newmont made the decision to purchase a 42 foot ft Semi-Autogenous Grinding SAG mill from Metso and a 28 Mega-Watt MW Gearless Mill Drive GMD from ABB for the Conga Project in Peru

PDF Understanding the effects of liner wear on SAG mill

The larger pieces break down as well To help the process along eight-inch-diameter steel balls are added to the rocks as they tumble inside the rotating mill semi-autogenous — gets some help from the steel balls The two SAG mills in the Mission South Mill each have two …

PRODUCT NEWS THE WORLD S LARGEST SAG MILL

mills in the older plants that had many mills in parallel In fact this is generally still the case in the multi-stream plants where mill liner design and selection is only tackled on a cost consumables basis However the gains to be had through good liner design and selection are just as great as on the large SAG mills