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SAG Milling in Australia -Revised Submission

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 (11 MW) is currently the largest twin pinion single drive mill installed in Australia. Problems have been experienced with the twin pinion

Autogenous and Semi-Autogenous Mills

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves SAG/AG Mill

(PDF) Evaluation of synchronous motors on grinding mills

This paper concentrate s on modern motor and drive solutions for s ingle and dual pinion driven Ball an d SAG Mills and the motors and drives used to p ower them. It will cover the application s

Gearless mill drives ABB

Larger ball and SAG mills, with higher installed power ratings relative to the mill diameter, offer higher efficiency and throughput, round-the-clock reliability and the opportunity to mine in remote areas. This makes low ore grades economical to grind. ABB has delivered some of the world's largest GMDs: • 22 MW GMD for 28’ ball mill • 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42

Autogenous and Semi-Autogenous Mills

Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves SAG/AG Mill

(PDF) Evaluation of synchronous motors on grinding mills

This paper concentrate s on modern motor and drive solutions for s ingle and dual pinion driven Ball an d SAG Mills and the motors and drives used to p ower them. It will cover the application s

Autogenous mills, semi-autogenous mills and ball mills for

Ring motor driven SAG mill for gold ore grinding. SAG and ball mills for com-minuting gold/ copper ore. Site assembly of a large mill shell. 3 The design offers such benefits as: xElimination of castings and the structural risk associated with them. xFeed and discharge designed to process requirements rather than to restrictions imposed by trunnion bearings. xMinimised risk of feed blockage

Gearless mill drives ABB

Larger ball and SAG mills, with higher installed power ratings relative to the mill diameter, offer higher efficiency and throughput, round-the-clock reliability and the opportunity to mine in remote areas. This makes low ore grades economical to grind. ABB has delivered some of the world's largest GMDs: • 22 MW GMD for 28’ ball mill • 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42

SAG Mill Components Mineral Processing & Metallurgy

SAG Mill Components. Post navigation . Previous. Next. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural components of any grinding

SAG Mill Grinding Circuit Design 911metallurgist

SAG Mill Circuit Sampling. Many mills have been built based on data from inadequate sampling or from insufficient tests. With the cost of many mills exceeding several hundred million dollars, it is mandatory that geologists, mining engineers and metallurgists work together to prepare representative samples for testing. Simple repeatable work index tests are usually sufficient for rod mill and

Ring-geared mill drives Grinding ABB

Mill load sharing Maintains equal torques on dual pinion mills throughout the whole speed range. Controlled rollback Prevents backlash and reduces downtime. Mill power ride through Keeps the mill operating even under voltage dips. Over-duty cycle Avoids unexpected downtime if the mill

AN OVERVIEW OF SINGLE STAGE AUTOGENOUS AND SEMIAUTOGENOUS

twin pinion or dual motor and pinion installation. 6. Power demand exceeds 14 MW. This puts the application in the realm of a single mill with gearless drive or, possibly, twin motors each with a twin pinion. See later discussion on aspect ratio. If the aspect ratio is low, then the limit of mill size is encountered, leading to a dual grinding line operation which may be less attractive

Advantages of SER drives for SAG mills GoHz

Advantages of SER drives for SAG mills. Friday, December 19, 2014. 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.

Preprint 13-050

SER drives are now mature and ready for use on 2 X 10MW dual drive mills. Speed variation required is in the range of +/- 15% of synchronous motor speeds. VVVF drive packages from ABB and Siemens are also available for 2 x 10MW in low and high speed options. Dual hydraulic inching drives provide a much safer and convenient operation with the added advantage of locked charge detection

SAG Mill Components Mineral Processing & Metallurgy

SAG Mill Components. Post navigation . Previous. Next. Once the basic operating conditions have been defined for the mill designer then, and only then, can he begin taking into account shell and head stresses and trunnion bearing sizes required to carry the load and to give the required openings for feeding and discharging the mills. Mill heads are key structural components of any grinding

Autogenous mills, semi-autogenous mills and ball mills for

Ring motor driven SAG mill for gold ore grinding. SAG and ball mills for com-minuting gold/ copper ore. Site assembly of a large mill shell. 3 The design offers such benefits as: xElimination of castings and the structural risk associated with them. xFeed and discharge designed to process requirements rather than to restrictions imposed by trunnion bearings. xMinimised risk of feed blockage

WEG Provides Innovation in Ball Mill and SAG Drives with

WEG Provides Innovation in Ball Mill and SAG Drives with Dual Pinions. WEG performed unprecedented equipment testing for solution in ball mill drive with dual pinion. 09/17/2013. WEG announced that it has successfully tested its new solution of low speed synchronous motors driven by frequency inverters for mills with dual pinions, at its testing facility in Brazil. Due to the complexity and

Ge Grinding Mill Drive Systems Stone Crushing Machine

dual motor sag mills beltconveyers. ball mill, ring gear, dual pinion, drive systems, SAG mill grinding process Sag Mill Drive: GE Canada: Chat Now; what is a ball mill drive Quadramatic TM Large Synchronous SAG and Ball Mill Drive Systems Up to 30,000 HP Up to 22,000 kW Up to 15,000 Volts Synchronous Motors GE mill grinding units Chat Now; ge grinding mill drive

Ring-geared mill drives Grinding ABB

Mill load sharing Maintains equal torques on dual pinion mills throughout the whole speed range. Controlled rollback Prevents backlash and reduces downtime. Mill power ride through Keeps the mill operating even under voltage dips. Over-duty cycle Avoids unexpected downtime if the mill

THE COMMINUTION CIRCUIT DESIGN FOR THE CONSTANCIA PROJECT

The use of a dual SAG mill arrangement in a cost effective layout added substantial value to the project by increasing both initial and post Year 6 plant throughput for a modest increase in project capital cost when compared with the DFS case of a single 21.5 MW Gearless Motor Drive (GMD) SAG mill. The mine planning and scheduling process required estimates of plant throughput based on ore

Mining Grinding and Processing WEG

Variable Speed . Single or double pinion driving systems. Designed to drive and control the speed of the medium voltage motors coupled to the SAG/AG, ball and HPGR mills with single or double pinion, the MVW01 frequency drive uses state of the art technology through a multilevel structure with medium voltage IGBTs, reducing the harmonic currents on the motor to extremely low levels.

Sag Mill Synchronous Motors caesarmachinery

Sag Mill Synchronous Motors. Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc. large synchronous motor. The poles of stage mill (no ball mill after the SAG mill) and has a diameter and

(PDF) SINGLE STAGE SAG/AG MILLING DESIGN SINGLE

These mills were often high fixed speed, low ball charge, SAG mills.To compensate for the identified potential problems, a number of design changes were made compared to those typically employed in South Africa.The selected mill had a variable speed drive to cater for changes in feed competency and rock content. The SAG mill was also designed with a high maximum ball charge (18%) so that

Difference Between Sag Mill vs Ball Mill mech4study

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. Interior of the drum uses the lifting plates. These plates