The various options available for larrsepower semiautogenous grinding (SAG) mill drive systems are examined, together with their impacts on mill design and relative capital and operational costs. A brief history of largemill drive systems is given. Stateoftheart mill design and mechanical design considerations are also discussed.
Remedial design of the worldÕs largest SAG mill gearless drive. In: International Conference on SAG grinding, SAG2001, Vancouver, Canada, 2001. New performance enhancements technologies for the ...
In Figur e 8 the starting torque profile is shown for a SAG Mill. ... This article reviews various mill drive configurations and improved SM characteristics when used with advanced drives. It will ...
A SAG mill has the advantages of high operation rate, large output, and large crushing ratio, which makes SAG mills have the characteristics of short process time, low management cost, and suitability for largescale production compared to other mills. ... Modeling and Evaluation of CycloconverterFed, TwoStator Windings SAG Mill Drive ...
The six ABB GMDs, which are the most powerful mill drive systems on the market are all now in continuous operation. Two 28 MW gearless mill drive systems (GMDs) are operating in the mine's 40 foot SAG mills and four MW GMDS are employed in 26 football mills along with associated control systems.
As you can understand from high standard deviation, the difference is not consistent but in 93 % of operation times, drive number 2 draw more current in both forward and reverse rotation. Power draw is about 7300 (kW) (max of Power draw is 8200 kW). The voltage always is consistent and there is no significant process change during SAG mill ...
The MAX Drive powers vertical roller mills up to 15,000 kW with two spur gear drive units that mesh with the girth gear under the mill table. Backed by experience and knowhow While our modern manufacturing processes are impressive, it's really our highlyskilled engineers and operators who make our girth gears stellar.
Mill in Brazil and Lumwana having a 38ft, 18 MW SAG and one 26ft, 16 MW Ball Mill in Zambia, all three mills put in operation in 2008, as well as Los Bronces, Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of MW commissioned in 2011. In the light of increasing interest in that technology various ...
E Primary SAG, 34x1 6 Two variable speed ac motors coupled mill, 4 million 22,500 to a gear drive with air clutches. motor, million each 6000 Two secondary ac synchronized motor coupled to a gear mill, million ball mills, 18x27 drive with an air clutch. motor, 602,000 6050 F Ptimary SAG, 34x16 Ringmotor system. mill, million ...
Vancouver, BC, Canada. With reference to the worked examples in Annex C, the expected specific energy for a crushing/ball mill circuit is ... mill and hence K 1 will tend to unity and the SAG mill ...
Relevant current waveforms associated with the starting of a 20 MW synchronous motor SAG mill drive are presented, as well as current and voltage waveforms during a cycloconverter commutation failure.
SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78%, with a 42 ft dia. mill built but not yet operational. The more recent option
the required SAG comminution of test ore material. Specific energy consumption (SEC) measured in kWh/t is a ratio of the mill drive power to the milling circuit output, without regard to circulating load. At the constant size of the cycle feed and discharge, SEC is a prime characteristic of material grindability in a certain ore pretreatment ...
95% linear loads 30 % linear loads. 5% nonlinear loads 70 % nonlinear loads. f GMD with 20'000 kW driving a SAG mill. In today's grinding plants are installed 1 SAG mill and 2. to 3 ball mills with a total installed milling power of about. 60 MW. Total installed plant power is about 100 MW.
Solution The problem was solved by replacing the existing drive with a watercooled ACS1000 medium voltage drive. ABB's ACS1000 soft starts the motor, allowing smooth ramp up, and allowing the motor and the SAG mill to run at the required load output.
has been selected to design and supply a 42 ft x 25 ft, ( x ) 28 MW gearless SAG mill, plus two 26 ft x 42 ft, ( x ) MW ball mills and two VTM1500WB VERTIMILLS ® for Newmont Mining Corporation's Yanacocha Conga coppergold project in Peru. The 42 ft diameter SAG mill is the world's largest and is the first of its kind.
The breakage rate function shape of the SAG mill is largely governed by the mill load particle size distribution and mill speed. The feed in the mill contains fractions of ore that serves as the grinding media. Larger ore fractions break the smaller particles but also breakdown themselves and exit the mill as a product.
As a result, ABB developed three of the largest diameter and most powerful drive systems for a SAG and two ball mills installed at the highest altitude to date. The fully integrated and optimized solution for the grinding circuit consists of: 1 x 28 MW GMD to power the 40 ft SAG mill. 2 x 22 MW GMDs to power two 28 ft ball mills.
Paper held at SAG Conference 2011 By S. Gaulocher (ABB), Stadler (ABB), Th. von Hoff (ABB), R. Veldsman (ABB), A. Fuerst (ABB) and J. Koponen (ABB): Gearless mill drives (GMDs) are the workhorse in the mineral processing industries, more specifically when it comes to grinding crushed ore and cement (in various production stages) in semiautogenous (SAG) mills and large ball mills.
The origins of the failure can be traced back to c. 1994 when PT Freeport Indonesia ordered its first gearless drive for their 34 ft SAG mill. ... 2001. A mechatronic solution Design and experience with large gearless mill drives. In Proceedings of the SAG 2001 Conference, Vancouver, Canada. [7] Meimaris, C., Lai, W. K. K. L., Cox, L., 2001
Single stage AG/SAG milling AG/SAG mills as a primary grinding stage in a circuit with or without additional stages of comminution Inclusion of pebblecrushing circuits in the AG/SAG circuit Circuits above, but with feed preparation including two stages of crushing—typically referenced as precrushing
DJB Consultants, Inc., Canada. Overview of Mill Selection •Grinding testwork to characterise the project's oretypes ... condition that the mill should be able to handle: SAG mills: 20% v/v ball charge, 30% v/v filling and 78% critical speed with worn liners Ball mills: 36% v/v filling and 78% critical
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
Abstract: Typical drive configurations of highcapacity SAG mills use a twostatorwinding vectorcontrolled synchronous motor, with a 30 ^{circ} shift between the two windings, fed by a twosecondary deltadeltawye power transformer and two sixpulse cycloconverters. This paper presents and evaluates three different modeling options for the SAG mill drive.
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