gearless ag / sag mills

largest sag mill

PRODUCT NEWS THE WORLD S LARGEST SAG MILL 27 · 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

2009 Gearless Mill Drives CB MUA

Gearless Mill Drives Machinery Risk Solutions Practice 2009 Matt Dugalic P Eng MARSH – MRSP Risk Consultant VP Kurt Tischler Dipl Ing Siemens –

Gearless Warp Around SAG Mill

A gearless synchronous direct drive of the wrap around design was selected instead offering several inherent advantages to the owners and operators The new mill with 10x the rated capacity could be installed in place of the old obsolete 100tph mill without disturbing the remaining 13 mills

Design of the 40 foot SAG Mill Installed at the Cadia Gold

The design of the 40 foot diameter SAG mill installed at the Cadia Gold Mine New South Wales Australia followed after two years of extensive second trial was to compare AG with SAG both

Preprint 13 050

method of driving SAG mills Ball mills and other rotating elements Several thousand grinding mills have been manufactured and have been in operation for the last century The gearless drive came into the minerals industry in 1980 and as per their reference lists Siemens have approximately 60 installations and ABB have approximately 85

Siemens modernises SAG mill gearless drive in Cadia Valley

This two stage grinding circuit consists of a 40 ft SAG 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 control module for the excitation circuit – the first time that both

Integrated drive technology from Siemens enhances

Quelle Source Siemens AG 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

Gearless mill drives ABB Group

28 MW GMD for a 40 SAG mill 28 MW GMD for 42 SAG mill Whether it is size or an installation at the highest altitude 4600 m a s l ABB s GMDs are well positioned to contribute to the building of larger and ever more powerful mills Leading the gearless mill drive evolution The ABB gearless mill drive GMD is the most powerful

Used SAG Mills for Sale EquipmentMine

UNUSED 36 X 23 AG Mill w 1500 KW Motor and 22 X 41 Regrind Ball Mill 13 405 HP Total Power UNUSED FL 40 x 25 Gearless SAG Mill and 26 x 40 6 Ball Mills BOLIDEN ALLIS CHALMERS 7 3m X 2 74m SAG Mill 9 6 X 19 4 EGL Wet Overflow Regrind Ball Mill

Semi Autogenous Autogenous Grinding Mills Sag Mills Market

Semi Autogenous and Autogenous Grinding Mills Market is driven by need for energy efficient solutions as grinding consumes more energy Semi Autogenous and Autogenous Grinding Mills are used for grinding large chunks of materials into small pieces which can be used for processing SAG Mills

MONSAG A new monitoring system for measuring the load

Fig 1 depicts a gearless mil drive where the mechanical power is transferred electromagnetically between the stator and poles of the rotor Errath et al 2003 Due to the mass flow materials and power involved in the process SAG mills face the problem of high energy impacts caused by steel balls cataracting against the shell of the mill with loss of energy and accelerated breakage of

gearless ball mills

gearless ball mills namesprojectsouthflorida 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 zenith is the world s leading supplier of gearless AG SAG mills

A Mechatronic Solution Design and Experience with Large

of large gearless cycloconverter drive sys tems for SAG Mills has become more and more common in the recent years Very high power ratings with excellent dynamic performance and high efficiency over a wide speed range allow advanced optimi zation of the process The design of such large mill drive systems requires modern

Gearless Drives

plied gearless drives for two 36 foot ring motors de veloping a 12 000 kW gearless drive for the Kennecott Utah SAG mill and a 11 200 kW gearless drive for the El Teniente Chile SAG mill In a continued call for larger even more powerful drives Siemens kept pace In 1996 Freeport ordered the first gearless

Gearless drive systems for belt conveyor and grinding

Siemens was responsible for the configuration manufacturing and the supply of the electrical equipment of the grinding mills The SAG mill was fitted with a gearless drive with a power rating of

The behavior of the cycloconverter fed gearless drive

motors 2 x 6 8 MW for the two ball mills and a 12 MW gearless drive for the SAG mill with its filter circuits A 14 MVA load and its compensation of 2 x 2 Mvar can represent the low voltage loads In this plant short circuit currents appeared in the gearless drive when the electrical power company disconnected the external supply

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

Autogenous Semi Autogenous Grinding Circuits

Table of Contents Autogenous Grinding CircuitsSAG vs Ball Mill AdvantagesAG SAG Mill Grinding Compared – Which is BestTesting for Product Size Size reduction is the most expensive operation in most mills Crushing and grinding usually require the greatest portion of capital costs and often make up 60 70 percent of total mill operating costs as shown in Figure 1

40 DIA X 25 GEARLESS SAG MILL New Used Mining

We have more SAG MILLS available also Call us for more details 40 DIA X 25 GEARLESS SAG MILL back to SUB CATEGORY Category GRINDING MILLS SubCategory SAG MILLS Nelson Machinery Equipment Ltd PO Box 180 6451 Trans Canada Hwy 1

SmartMill Grinding ABB

Combine ABB s variable speed drive system with advanced process control ABB Ability™ Expert Optimizer for grinding to provide maximum mill control It can be applied to new or existing AG SAG and ball mills powered by either ring geared mill drives RMD or gearless mill drives GMD


single stage SAG mills to the largest mill in the world – with a 40 foot diameter and 28 MW of motor power 18 000 kW normally use gearless drives Outotec can offer geared drives in excess of 24 MW Smaller mills up to 450 SAG and AG mills typically have

Mining Technology Mining News and Views Updated

Gearless AG SAG and ball mills is the world s leading supplier of gearless AG SAG and ball mills The experience gained from installation and operation of these mills has enabled to offer some of the largest and most efficient grinding mills worldwide

SAG Milling in Australia Revised Submission

The CCV – ring motor gearless drive is used at Cadia 20 MW and Olympic Dam 18 MW It has been the industry standard for SAG mills above 13 MW capacity However pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW The Ernest Henry SAG mill

Updates on geared vs gearless drive solutions for grinding

The Coalition for Energy Efficient Comminution CEEC has been established and is supported by a broad range of mining sector companies keen to accelerate awareness knowledge transfer and by implication improve energy and cost outcomes in the substantive area of comminution

Gearless Ag Sag Mills at Best Price in Alwar Rajasthan

We hold expertise in manufacturing exporting and supplying of Gearless AG SAG mills in Alwar Rajasthan India 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 s leading supplier of gearless AG SAG mills


Autogenous mills AG Mill semiautogenous mills SAG Mill The CITIC autogenous semiautogenous mills are utilized to grind run of mine rock or primary crusher discharge The feed size to this mill is limited to the maximum size that can be practically conveyed and introduced into the mill

Mining Non Ferrous CITIC Heavy Industries Co Ltd

CITIC HIC manufacture a full range of Grinding Mills for the Mining Sector Our largest mills has been delivered to SINO Site to date are Ø12 2m x 11m 28MW Gearless Drive AG Mills and Ø7 9m x 13 6m 2x8 MW Twin Pinion Drive Ball Mills These mills are scheduled of start up on 2012

to Design and Supply the World s Largest SAG Mill in

Oct 05 2010 · has been selected to design and supply a 42ft x 25ft 12 8m x 7 6m 28MW gearless SAG mill plus two 26ft x 42ft 7 9m x 12 8m 15 6MW ball mills and two VTM 1500 WB VERTIMILLS® for Newmont Mining s Yanacocha Conga copper gold project in Peru The 42ft diameter SAG mill is the world s largest and the first of its kind

ABB ring geared mill drives YouTube

Jun 05 2013 · We provide optimized mill drive solutions for all types of ring geared mills low and high speed single and dual pinion with and without a gearbox all designed for reliable long life and

The operation modes of a grinding mill with gearless drive

The operation modes of a grinding mill with gearless drive Reprint November 2006 By Norbert Becker Director Dept Mining Technologies Siemens AG Erlangen Germany Kurt Tischler Product Manager Gearless Drive Siemens AG Erlangen Germany Stefan Smits Team Leader Engineering Drives Siemens AG Erlangen Germany

sag mill maintenance

Gearless AG SAG mills The experience gained from installation and operation of these mills enables us to offer mills of up to 35 000 installed horsepower or more Today a single grinding line with a Gearless SAG mill and appropriate ball mills can process over 100 000 mtpd

SAG Mill Grinding Circuit Design

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 and a 28 Mega Watt MW Gearless Mill Drive GMD from ABB for the Conga Project in Peru

Grinding mills

Every mining operation has a unique grinding process 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

Wet mill horizontal AG SAG Corporation

Simplifying wet grinding with AG SAG mills AG SAG mills are often the optimum solution for wet grinding achieved in a slurry 50 to 80 percent solids AG SAG mills can accomplish the same size reduction work as two or stages of crushing and screening a rod mill and some or all of the work done by a ball mill

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