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Twin Pinion Ball Mill Autogenous and semiautogenous mills . the ag/sag mills are utilized to grind runofmine rock or primary crusher and screening, a rod mill, and some or all of the work done by a ball mill. mill motor gear drives can be offered for ag/sag grinding mill as dual pinion drives . copper mountain: overview on the grinding mills and their dual . ball mills.
3 SAG mill (8 – 15% ball charge) Variable competency ore 4 High ball charge SAG mill (15 to 25% ball charge) Incompetent ore 5 Low ball charge SAG mill, high mill speed. (4% ball charge, 90% Nc) A cross between AG and SAG for competent, abrasive ores. As typically operated in RSA. 6 SAG mill (configurations 3, and 5 ) with recycle crusher
According to ABB, the upgrades to Vale''s existing Clarabelle dual pinion semiautogenous (SAG) mill will allow it to reduce the size of the ore at the company''s nickel and copper mines in the ...
Designed for the single or dual motor SemiAutogenous Grinding (SAG) mill market, this new technology addresses all mechanical, electrical, environmental and cost concerns. Delivering unmatched SAG Mill speed and power. Sub and hyper synchronous mill motor speed control is offered without speed deadband.
mill, it needs to have a bore larger than the mill outside diameter. The mill outside diameter is a function of the grinding process selected. Autogenous mills are the largest in diameter since the feed grinds itself. A semiautogenous mill uses some metallic or ceramic balls to assist the grinding process and can be slightly smaller.
The modernization project includes two 8 MW SAG (semiautogenous) mills and two MW ball mills with dual pinion drives. The new drive systems are replacing the existing synchronous motors and direct converters for the SAG mills and the drive systems of the ball mills, which were installed by a . Get Price
main drive motor or 2 x main drive motor for dual pinion drives. The power computed above is considered P inch = N o_inch · P mill_motor N o_mill. Source IEEE Association Event Installation Inspection Relining Number of starts 25 10 50 Frequency per year 1 52 1 Number of years 1 25 25 Number total cycles 25 13000 1250
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.
2 Units UNUSED FL 36'' x 24'' Dual Pinion Sag Mill with 2 ABB 9,000 kW (12,069 HP) Motors for Total Power of 18,000 kW (24,138 HP) Inventory ID: 6CHM03 2 Units UNUSED FL 36'' x 24'' Dual Pinion SAG Mill with 2 ABB 9,000 kW (12,069 HP) Motors for Total Power of .
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. FullerTraylor SAG/AG Mills range in size from through in diameter with powers as high as 28,000 kW.
SAG mill rated motor speed 204 rpm, max. motor speed 214 rpm Ball mill rated motor speed 195 rpm, max. motor speed 209 rpm Starting torque: 150% for 15 s Main voltage level where the drive system is connected: 25 kV Excitation power is provided by a kV bus
Figure 1 – Top view of SAG mills with alternative drive options; left side: dual pinion drive including motor, gearbox, pinion and girth gear; right side: gearless ring motor Declining ore grades, leading to increased material transport and plant throughput requirements, are one of the
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 (cycloconverter) is typically used because gearboxes and pinion gears reach their present limit in size ...
SAG mills are autogenous mills but use grinding balls like a ball . gearless sag mill slip ring motor . sag mill ring gear failuresag mill rocker block gold . Get Price And Support Online; dual motor sag mills .
For Dual or Single Pinion Configuration of Ball and SAG Mills, the Wound Rotor Induction Motors, and separated slip ring chamber avoiding possible winding ... goldentimcoin. fed Gearless Motor Drives for Grinding Mills ring motor sag mill,1 shows the general scheme of a mill, Motors TECO Motor Typ Slip Ring Induction Motors, . Cement Mills ...
The Slip Energy Recovery Drive (SER 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).They are also the dominant technology in wind turbines.
SAG is an acronym for semiautogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42'' () in diameter, powered by a 28 MW (38,000 HP) motor.
dual motor grinding mill drive synchronous motor Patent US Twin motor drive system Google Patents. A twin motor drive system having two synchronous motors of usual Large grinding mills such as ball or rod mills, and particularly rock or ore grinding mills. 1966, Mar 18, 1969, Northern Electric Co, Drive system employing dual motors.
installed power to maximise net present value. 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 MW Gearless Motor Drive (GMD) SAG mill.
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 .
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. Overduty cycle – Avoids unexpected downtime if the mill .
number of the largest SAG mills designed are installed in single stage configuration. This paper discusses the ... This puts the application in the realm of dual motor, dual pinion installations. xPower demand of 16 ... Historically starting a single large motor that is a significant portion of the entire plant load was viewed as an
drive application is a dualpinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive10SPRs control motor speed by recovering rotor current and returning the power to the utility supply. Confi gured in a twin motor arrangement, the motors share load in the tandem mill.
sag mill dual pion nov; Paper # 25 Copper Mountain Overview on the Grinding. COPPER MOUNTAIN: OVERVIEW ON THE GRINDING MILLS AND THEIR DUAL PINION MILL DRIVES ABSTRACT This paper will first give a short overview of the Copper Mountain project in British Columbia, which just has started commercial operation earlier this year.
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