cycloconverter unit to provide a controlled speed variation of the mill Product from the SAG mill passes through internal grates onto a trommel screen which scalps 7mm material and returns it to the SAG mill feed conveyor Trommel under size is pumped to two parallel over flow ball mills in closed circuit with cyclones

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 Award of Contract March 1999 Start of Operation June 2001 ABB 39 s scope of supply Four complete Gearless Mill Drive Systems including Wrap around Motors Cycloconverters amp Excitations

Power is supplied to the motors from a cycloconverter unit to provide a controlled speed variation of the mill Product from the SAG mill passes through internal grates onto a trommel screen which scalps 7mm material and returns it to the SAG mill feed con veyor Trommel undersize is pumped to two parallel overflow ball

INCREASING SAG MILL CAPACITY AT THE COPPER MOUNTAIN MINE THROUGH THE blasting and fragmentation optimization of the SAG mill in terms of discharge grates ball size and slurry density and filtered before transport to the port site and tailings cycloned to produce coarser material for wall building

The gearless motor also called wrap around motor or ring motor is a very large synchronous motor The poles of the motor are directly installed on a pole flange on the mill shell this means the mill body becomes the rotor The stator of the gearless motor is then wrapped around the mill With this innovative concept the nbsp

16 Pyro processing middot 17 Pyro processing equipment middot 18 Real time mill management tools middot 19 Rod mill middot 20 SAG mill SAG is an acronym for semi autogenous grinding and applies to mills that utilize steel balls in addition to large rocks for grinding A sag mill is generally used as a primary or first stage grinding solution

The paper examines the current state of equipment and circuit design with reference to Australian practice Following a review of the changes in milling applications over the last fifteen years developments in mill design are examined Current issues include trunnion versus shell support drive type and economic analysis nbsp

This circuit consists of a 4 megawatt SAG Mill operating in open circuit followed by a 11 5 megawatt Ball Mill running in closed circuit with hydrocyclones Through this circuit the ore is Pre cycloning The concentrate material recovered from the first stage of flotation requires further upgrading As such this material is then nbsp

The extremely high reliability and avail ability of Siemens SIMINE Gearless Mill Drives is based on mature technology which we continually update with new proven features Cycloconverters for example are just Whether you 39 re talking about SAG or ball mill space is a sensitive subject especially in the concentrator

26 Jun 2009 GMDs are used on the larger ball and semi autogenous grinding SAG mills where power transfer through the con ventional gearbox pinion and girth one excitation transformer and the harmonic filter banks as well as the E house containing the cyclocon verter and control the motor control centre the nbsp

Abstract A detailed evaluation of a SAG mill starting is presented using three different modeling options First option considers a qd0 model of the two stator windings synchronous motor fed by two 6 pulse cycloconverters The second option considers the qd0 model of an equivalent one stator winding synchronous motor nbsp

21 Dec 2007 With the HPGR in place of the SAG mill the power requirements of combined crushing grinding 1 SAG Mill 10 36 x 5 79 m 10 4 MW 1 Secondary Crusher 750 kW 1 Pebble crusher 315 kW 1 HPGR 5 3 MW 2 Ball Mills 6 1 m x 10 2 m SAG OPTION SAG Mill 2 Ball Mills Pumps Cyclopac

Figure IV 4 Number of AG and SAG mills commissioned per year Jones Jr and Fresko 2011 Figure IV 5 AG and SAG mill profile showing EGL measurement Wills and Napier Munn 2006 techniques can be used such as sedimentation X ray scattering cyclo classification elutriation machine vision and others nbsp

SAG Mill Ball Mill Pebble Crusher Preleach Thickener Concentrator Cyclopack Screens Conveyor systems Transformers and MCC 39 s Modular Electrical rooms Intensive Cyanidization Unit ICU Process Pumps Wet Scrubber Cyclone All Project Management cost control safety scheduling and quality control nbsp

where applicable the potential reliability differences between the initially proposed 40 ft SAG mill and the equivalently powered 42 ft SAG mill Newmont made the decision in 2010 to purchase a 42 ft SAG mill from The gearless motor is fed by a cyclo converter which is an extremely compact and efficient drive

4 Apr 2017 Is it advisable to use a SAG mill for small say 2000 TPD concentrator operations It has been said by some that the SAG mill is the most forgiven piece of mineral processing equipment that one can have As full tin recovery circuit was built dual cycloning to produce sands fines and discard slimes

Toromocho Copper Mine Morococha Perú 1x28MW 40 39 SAG Mill 2x22MW 28 39 Ball Mill GMDs the highest power density and most powerful GMD systems ever installed worldwide at high altitude 4600msal Complete electrical engineering design and testing for this project cycloconverter transformers E Houses

26 May 2011 The GMD powers a 38′ SAG mill at the Canadian Malartic gold mine Engineering delivery and commissioning of the complete 19 MW GMD system are worth more than 20 million Ronald Bougie General Construction Manager at Osisko said We are very satisfied with ABB 39 s performance throughout nbsp

Gearless mill drives are becoming the drive system of choice on large AG SAG and ball mill installations for new impregnation transformers E houses cycloconverters spare parts shipping coordination cabling and power factor correction and as well as material delivery supervision of installation and commissioning

s Industrial Solutions and Services SIMINECIS MILL GD Completely Integrated Solutions for the Mining Industry Set new standards for productivity Cycloconverters for example are just one of the reasons why Siemens solutions excel Whether SAG or Ball Mill space is a sensitive subject especially in the con

With the proven use of gearless drive technology the limitation of AG SAG mill size due to gearing constraints has been eliminated is the world 39 s leading supplier of gearless AG SAG mills

ore is processed through a SAG Ball mill circuit and flotation to produce concentrate Plant nameplate design Primary grinding is achieved in an 18MW 11 58m diameter x 5 49m EGL SAG mill discharging over a Figure 7 Percentage of time cyclopack pressures was within each operational range Mill Weight Standard nbsp

of steel media wear in SAG and Ball mills Sizing Measurements including sieve sizing laser sizing and cyclosizing to determine the particle size distribution as well as obtain samples for assays on a sized basis if required X Ray Diffraction XRD using the unique x ray fingerprint of each mineral to identify and quantify nbsp

solutions are explained and experimental results are presented showing their operation Keywords cycloconverter gearless mill drive GMD protection minerals processing grinding I INTRODUCTION To process an average of 120 000 tons day of mineral the Laguna Seca concentrator uses a SAG mill and three ball nbsp

Even ball mills have a power larger than 10 MW For this reason they have an important impact in energy consumption and in the operation of the power distribution system Figure 1 Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor

The Siemens Drive Technologies Division is delivering an Integrated Drive System for two new mills for the Toromocho mine in the Peruvian province of Yauli In future two gearless mill drives and water cooled Sinamics cycloconverters will be used in the new production line with one SAG mill and one ball mill Thus nbsp

23 Mar 2012 This two stage grinding circuit consists of a 40 ft SAG semi autogenous grinding Mill with a 20 MW Siemens gearless drive and two parallel 10 MW gear driven ball mills Siemens has now fitted the SAG mill with a Sinamics SL 150 cycloconverter for closed loop control as well as with a Sinamics DCM nbsp

A For large mills requiring variable speed the wound rotor motor and SER drive are economical for a total rating of approximately 2MW to 16MW Above 16MW the gearless drive cyclo converter is typically used because gearboxes and pinion gears reach their present limit in size Around 2MW and below the squirrel nbsp

In future two gearless mill drives and Sinamics cycloconverters will be used in the new production line with one SAG mill and one ball mill Thus one million tons of copper concentrate 10 000 tons of molybdenum and four million ounces of silver oxide can be mined annually – even at an altitude of around 4600 m above nbsp

29 Aug 2014 circuit such as feed mill and discharge requiring some supervisory layer to H ydro cyclo nes Discharge Pump Flotation Feed Pump Mill Dry Feed Conveyer 19th IFAC World Congress Cape Town South Africa August 24 29 2014 9787 Curves as a Tool for Characterising SAG Mill Performance

Large inductive loads on weak grids with low short circuit level result in voltage sags low productivity and higher operating costs Improved power quality helps avoid jams and improve payload in mining plants up to 30 Mine winders sag mills crushers shredders and conveyors are typical applications for Merus nbsp

Muchos ejemplos de oraciones traducidas contienen sag mill – Diccionario español inglés y buscador de traducciones en español

Mount Polley is an open pit copper gold mine in British Columbia wholly owned by Imperial It produces on average 20 000 tonnes per day In 2010 77 of the mill feed was supplied by the Springer pit but in 2011 virtually all mill feed will be sourced there with the balance from the Southeast and Pond zone pits which nbsp

2003 THE ROLE OF MINERALOGICAL STUDIES IN OPTIMISING MINERAL PROCESSING AT NORTH AMERICAN PALLADIUM 39 S LAC DES ILES MILL AUTHOR CHRIS J study the samples were classified into two or more size fractions by cyclosizer A portion of the SAG mill feed is crushed to –25mm to increase nbsp

11 May 2014 Gibraltar Overview Safety Mill Production Mine Production Mine to Mill Business Improvement Questions Agenda Gibraltar–One Mine Two Concentrators 54 x74 Primary Crusher 34 39 SAG Mill 20 39 Ball Mill Rougher Flotation – OK160 Cells Mo Separation Regrind Cyclopac Installation

Many translated example sentences containing quot sag mill quot – Spanish English dictionary and search engine for Spanish translations

8 Sep 2017 Undersize and crushed ore at minus 15cm size is conveyed to one of the two SAG mill ball mill combinations The SAG mill 5000x2800mm 750KW reduces the ore to minus 1mm The SAG mill discharge is cycloned with a cut 80 less than 75µm the underflow passing to a ball mill 4000x6000mm nbsp

circuit of a typical drive for a high power SAG mill The synchronous machine has two three phase windings each of which is fed by a six pulse CCV A 12 pulse configuration is obtained at the primary side of the transformer by using secon daries in delta–wye connection The primary of the transformer is connected to the nbsp

USED 10 000 TPD Crushing Grinding Circuit Gold Plant with 32 39 x 12 39 SAG Mill 14 5 39 x 28 39 Ball Mills 54 quot x 74 quot Gyratory 7 39 SH HD Cone Rock Breaker amp More UNUSED Regrind and Flotation Expansion Plant Components including SMD 355 kW Mills RCS Flotation Cells Pumps Tanks Cyclopacs and More UNUSED nbsp

Looking at economy of scale new projects consider the use of big mill grinding circuits where larger power gearless motor drives with cycloconverters in the range around 20 MW are being applied for semiautogenous SAG mills and recently ball mills are also being considered This work addresses some current issues nbsp