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feed size (F80) of over 70 mm and a SAG mill throughput of 5200 t/h. The Batu Hijau SAG mill specific energy was a function of point load test and RQD. The point load test substitutes for Axb measurement in that relationship. The Batu Hijau ore is less fractured than the Constancia ore based on the average RQD data and Constancia's SAG mill ...
The motors are not described in detail, but the paper does mention a problem with "SER", which usually stands for "slip energy recovery", suggesting that the SAG mill .
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.
Energy recovery potential in comminution processes ... Energy recovery efficiency as defined by Carnot is a function of the temperature difference between the hot source and a cold source. Essentially, increasing this temperature difference will in- ... Referring to the Cadia SAG mill .
Preprint 13-050 UPDATES ON GEARED VS GEARLESS DRIVE SOLUTIONS FOR GRINDING MILLS R. Kalra, CITIC-HIC Pty Ltd, ... comparisons and attempts to dispel some of the myths regarding Slip Energy Recovery (SER) and variable frequency drive technology on ... SAG mill conference, provided details of the then largest gear drive in operation on a SAG mill ...
Modern mill operators in mining and mineral processing require a specific range of mill speed to achieve the best grinding performance and reduce mill liner wear. With the latest generation technology and significant investment, CSE Uniserve created the Modern Slip Energy Recovery (SER) Drive which offers extensive speed control and no ...
Responsible for the sale & project management of large drives, fixed and variable speed. Examples: 4 off 20,3 MW motors to petrochemical plant, 2 of 3,115 MW 6,6 kV slip energy recovery pump drives. Worked on a variety of problems arising from integrating motors with early VSDs.
ball mill using WRIM with Slip Energy Recovery and gearbox, assume 0.95 × 0.97 efficiency = 0.9215 conversion DCS power to shell. Plant DCS data Jan 2014 to Mar 2015: secondary crusher specific energy consumption 0.4 kWh/t assume product size 35 mm; power draw back-calculates to 763 t/h × 0.4 = 305 kW (45% of available power)
The Slip Energy Recovery Drive (S.E.R. Drive) is a technology well proven in the industry for large power motoring systems that allows precise motor speed control at the same time that recover the slip energy in the wound rotor induction motors (WRIM). The typical applications include SAG mill, AG mill and ball mill.
A full investigation into on a dual (2 x 3,6 MW, 11 kV) Slip Energy Recovery ("SER") drive grinding mill was prompted by the failure of a pinion during drive commissioning. This paper gives an overview of SER drive principles and the stress imposed on SER drives during supply disturbances.
Mining-specific solutions From electrical to digital solutions As one of the major suppliers of the global mining industry, we offer a comprehensive solutions portfolio that enables you to effectively meet your challenges at each process stage, from extraction to transportation and beneficiation.
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 (11 MW) is currently the largest twin pinion single drive mill installed in Australia.
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 mill technology, developed over decades for maximum reliability and performance.
New Human Machine Interface - RMD Cockpit. With the RMD plus solution, operations and maintenance activities are fully optimized with the newly developed Human Machine Interface "RMDcockpit".. Based on ABB's 800xA platform, the RMDcockpit is a specific mill application tool comprised of a touch screen panel allowing full access to the main parameters of the drive system as well as to the ...
with a minimum wear of brushes and slip rings, drastically reducing mills downtimes due to maintenance. On some speed variation range, Slip Energy Recovery (SER) systems can be used together with traditional starting system (LRS) with the objective of recovering dissipated energy from the rotor circuit towards the main bus bar. Fixed Speed
installation of a 40ft, 28MW SAG mill GMD and two 28ft, 22MW ball mill GMDs at Toromocho (Minera Chinalco Peru) at the unprecedented height of 4600m above sea level. by Matthias Neurohr, ABB Switzerland Ltd IRevival of the GMD in cement Mr P Subba Raju, MD Lalitha Cement, and Abdellah Nahdi, senior sales manager ABB
When mill diameter and mill power became again increased, only the Gearless Mill Drive (GMD) could be envisaged to cover this requirement above 10 MW. The GMD is by its nature a variable speed drive system. Process operators, once having the facility of adjustable speed, could not live anymore without it for SAG mills.
SAG mill grinding process - Gearless mill drives systems - Gold Ore Crusher. GMD system SAG mill. Slip Energy Recovery Drives. These drive systems use slip ring motors and are started similarly using starting resistors, thereby limiting the inrush current.Capital expenditure for gearless mill drives is typically higher than for other drive systems.
with your Wound Rotor Motor. Choose from: Liquid Rheostats Slip Energy Recovery Systems Soft Starters Dual Load Sharing, Running Duty, or Starting Duty Secondary Resistance Controllers A variety of enclosure options are available to provide protection to your .
The CSE Uniserve Rotor Drive Slip Energy Recovery System (SER) is designed for reliable and repeatable mill starting and speed control and to return all unused energy into circuit below when operating speed. It exclusively offers operators full torque at hyper synchronous speeds. Typical applications include mills, crushers, fans and pumps.
• The TMdrive-10 drive hardware requires no modifi cations in the slip power recovery drive application Precise control of wound rotor motor while conserving energy • Soft starts the mill motors • Drives control motor torque (rotor current) directly; motors do not have to increase slip (slow down) to
Dec 19, 2014· Advantages of SER drives for SAG mills. Friday, December 19, 2014 ... The converter is only sized for the feedback energy which is proportional to the speed difference from synchronous speed. The drives are typically set up to run between about 85% to 110% of synchronous speed for an optimized arrangement. ... Brush/slip ring maintenance is one ...
WEG offers the most reliable and efficient solutions for milling plants for ferrous and non-ferrous products with their experience of mill drive systems. In the heart of a processing plant, the ball and SAG mills must be driven by solutions that adapt to the characteristics of the minerals in line with the whole process.
Energy recovery potential in comminution processes. Author ... The resulting effect of expanding the control volume to include the two ball mill circuits on the annual energy recovery potential is a recovery of 6.7 GW h for the SAG mill circuit and 8.6 GW h for the SAG/ball mill set or a potential annual energy saving at 20 cents/kW h of 1.7 ...
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