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siemens/mining Flexible Slip Energy Recovery Drive

The flexible Slip Energy Recovery Drive (SER) enhances the tradi-tional subsynchronous SER by increasing the speed range and ... • SAG mills and ball mills in the mining industry, where an increase of efficiency and productivity is desired while availability is maintained

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Preprint 13-050

Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive ... comparisons and attempts to dispel some of the myths regarding Slip Energy Recovery (SER) and variable frequency drive technology on ... Mill. In this case the GMD requires slightly less space but it does

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TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL

SAG mills have a power higher than 10 MW. 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.

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Gearless mill drives - Grinding ABB

ABB’s GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This ’workhorse’ for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant.

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Benefits of continuous data acquisition from critical ...

Figure 4: Two SAG Mills 24MW each and Two Ball Mills 16.4 MW each with Gearless Mill Drives For larger applications the well-proven Gearless Mill Drive (GMD) technology has shown to be very effective since its introduction in mining in 1980; currently in operation for horizontal mills up to 40 feet (~12.2m) diameter with

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CMP Paper 16.10.09 Final

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.

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Slip Energy Recovery Drives (SER) Australia CSE Uniserve

Description. 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 100% speed. It exclusively offers operators full torque at hyper synchronous speeds. Typical applications include mills, crushers, fans and pumps.

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THE COMMINUTION CIRCUIT DESIGN FOR THE CONSTANCIA

mill work index 11.4 kWh/t and an average RQD of 44%. RQD values of 25% resulted in a SAG mill feed size (F80) between 55 and 60 mm and throughputs of 6200 t/h. RQD values of 55% resulted in SAG mill 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 ...

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Slip Energy Recovery of an Induction Motor - Circuit Globe

Slip Energy Recovery is one of the methods of controlling the speed of an Induction motor. This method is also known as Static Scherbius Drive.In the rotor resistance control method, the slip power in the rotor circuit is wasted as I 2 R losses during the low-speed operation. The efficiency is also reduced.

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Predicting SAG/AG Mill and HPGR Specific Energy ...

units kWh/t and is the energy applied during impact breakage. As the impact energy is varied, so does the t 10. Higher impact energies produce higher values of t 10, which is reflected in products with finer size distributions. The A and b parameters, in conjunction with equation 1, are used in AG/SAG mill modelling for

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Preprint 13-050

Among the many reasons that geared drives on large SAG mills are not favoured, is due to not having an efficient variable speed drive ... comparisons and attempts to dispel some of the myths regarding Slip Energy Recovery (SER) and variable frequency drive technology on ... Mill. In this case the GMD requires slightly less space but it does

Read More
Gearless mill drives - Grinding ABB

ABB’s GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This ’workhorse’ for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant.

Read More
CMP Paper 16.10.09 Final

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.

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Energy Consumption in Mining Comminution - ScienceDirect

Jan 01, 2016  One of the largest SAG mills (12m diameter), has a variable speed GMD (gearless mill drive, made by ABB) drive and has a capability of 28 MW for refining copper-molybdenum- silver [13]. Mills usually have motors in the following range: SAG mill motor: 7,435 kW or an HPGR circuit with motors: Ball mill 1 (4,015 kW) and Ball mill 2 (4,152 kW) for ...

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Benchmarking: Bond - Santa Rita - SAGMILLING.COM

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 uses a gear drive with an induction motor. Assume that the ball mill also has an induction motor with gear drive, so for both mills use 0.97 for mechanical efficiency between the ...

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TMdrive -10SPR Product Application Guide

energy, and can perform additional VAR compensation Application 2. Slip Power Recovery Drive System for a grinding mill SAG Mill and Motor The Best Solution: TMdrive-10SPR for each pump • The SPR drive carrying slip power is much smaller and less expensive than an MV drive carrying all the motor power at full speed (4 kV voltage)

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Didipio – SDG

This gold mine installed Mill Safe Start Systems on both their Ball and Sag mills. The Sag mill switches over to a Slip Energy Recovery Drive after start-up. Media Gallery. Play. Play. Previous. Next. Go Back to All Projects. Menu Links.

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Planned Maintenance Systems Solutions In Australia CSE ...

Rotor Drive Slip Energy Recovery: QLD: SAG Mill sub and hyper synchronous speed control and starting with Unistarter LRS. Water: Fuji LV Drives: QLD: Specified drives due to ongoing reliability and locally-based service and support. Mining: Rotor Drive Slip Energy Recovery: QLD: Pump drive and energy recovery. Mining: Transformers: QLD

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Electrodrives- ElectroDrives SL Ser. Drive Specialist

ElectroDrives is manufacturer of solutions for industrial applications of controls and power electronics in medium voltage (1kV-35kV). We are experts in Slip Energy Recovery Drives (SER Drives), Liquid Resistor Starters (LRS), Induction Motors, Reactive Power Compensation, Static Excitation Systems and Harmonics filters.Find out the solutions we provide to our customers for their SAG mills

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Factors Affecting Ball Mill Grinding Efficiency

The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed – Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed that take this factor into account. As well, mills with

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Benchmarking: Morrell Mih - Tropicana - SAGMILLING.COM

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)

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Outotec presents the world's largest SAG mill - Metso Outotec

Sep 21, 2012  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.

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HIGH INTENSITY GRINDING ISSUE 32 AT ITS FINEST

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.

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Starter of SAG Mills with rotor resistance

Sep 17, 2013  For now I am working on a mining project which involves starting two SAG mills, the method of starting these mills is by rotor resistance and likewise we are using an energy recovery system (SER), could someone tell me how this system works SER? each mills have two motors of 8000 kW at 13.8 kV. thank you for all.

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Energy Consumption in Mining Comminution - ScienceDirect

Jan 01, 2016  One of the largest SAG mills (12m diameter), has a variable speed GMD (gearless mill drive, made by ABB) drive and has a capability of 28 MW for refining copper-molybdenum- silver [13]. Mills usually have motors in the following range: SAG mill motor: 7,435 kW or an HPGR circuit with motors: Ball mill 1 (4,015 kW) and Ball mill 2 (4,152 kW) for ...

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Improved characterisation of ball milling energy ...

Jan 15, 2018  The HPGR-ball mill circuit was estimated to require 75% of the energy of a standard Semi-Autogenous Grinding (SAG) mill circuit. Even with an anticipated greater capital cost, the HPGR-ball mill circuit was found to give significantly better financial returns in all cases investigated in the feasibility study ( Ballantyne et al., 2016 ).

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HIGH INTENSITY GRINDING ISSUE 32 AT ITS FINEST

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.

Read More
Outotec presents the world's largest SAG mill - Metso Outotec

Sep 21, 2012  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.

Read More
Electrodrives- ElectroDrives SL Ser. Drive Specialist

ElectroDrives is manufacturer of solutions for industrial applications of controls and power electronics in medium voltage (1kV-35kV). We are experts in Slip Energy Recovery Drives (SER Drives), Liquid Resistor Starters (LRS), Induction Motors, Reactive Power Compensation, Static Excitation Systems and Harmonics filters.Find out the solutions we provide to our customers for their SAG mills

Read More
Benchmarking: Morrell Mih - Tropicana - SAGMILLING.COM

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)

Read More
Ring-geared mill drives - Grinding ABB

Mill application features. Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if the mill is still rocking or moving after a stop ...

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Torque Limiting Couplings Reliable Energy Production

Energy extraction from natural resources can be quite unpredictable. To be effective you need to be able to control overloads caused by grid variations, torque peaks and mechanical problems. Voith couplings ensure reliability in energy recovery. The Challenges in Energy Extraction Voith manufactures and develops world leading torque limiting

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Factors Affecting Ball Mill Grinding Efficiency

The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency: a) Mill Geometry and Speed – Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed that take this factor into account. As well, mills with

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ABB wins $47 million contract from Codelco for Chilean ...

The GMD system portion consists of a 12 MW GMD for a 36″ SAG mill and two 8.9 MW GMDs for two 22″ ball mills. Leaving the factory at the end of 2011 those two GMDs will be the first ones assembled at ABB’s new GMD assembly factory in Basel, Switzerland.

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Recent Improvements in the Milling Circuit at Tropicana

The ball mill is equipped with two 7.0 MW Slip Energy Recovery (SER) drives, allowing variable speed operation and an over-rated total power of 15 MW at maximum speed. The final P 80 target for the cyclone overflow is 75 μm.

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Pinion Drive Sag Mill - mayukhportfolio.co

The resulting mill design was 6.1m dia x 9.05 EGL SAG Mill with a 5.2MW ... with an identical structure, trunnion bearings, girth gear, pinion and pinion bearings. ... of installed power included a Hypersynchronous Slip Energy Recovery Drive...

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Kabwe Sergues - Shift Supervisor Electrical ...

Worked on master drives, simocode, robicon drives, LRS starters for crushers / mills, rectiformers and SER Slip energy recovery drive for the mills. I have experience in motor maintenance 5.8MW Teco mill motors for sag /ball mills, 6.6KV Teco crusher motors. Worked on rectifomers ABB 15KA, 30KA output both maintenance and repair.

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Wound Rotor - TECO-Westinghouse

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 motor investment. Our wide selection allows you to choose the one that best meets your unique needs: ODP Open Drip Proof (IP 12)

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