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SAG Mill Control: It Shouldn't be that Hard | E & MJ

A control strategy recently implemented on a large variable-speed SAG mill at MMG's Century Zinc operation in Australia is shown in the chart (found on pg. 32). In this case, mill speed is the primary manipulated variable used to control mill load.

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Ingeteam will supply VSD variable speed drive for the ...

INGEDRIVE™ MV100 medium-voltage variable speed drive to be used for the mill drive at a greenfield copper mine in Nevada, USA. In the third quarter of 2018, The company FL awarded a contract to Ingeteam for the delivery of one medium-voltage variable speed drive from the INGEDRIVE™ MV100 family with the following characteristics: UL listed, air …

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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. ...

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What's the Difference Between SAG Mill and Ball Mill ...

The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...

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The engineering and process effects of choosing a motor ...

effect of varying the mill speed as a fraction of the critical speed, ⌽ C, can be observed by plotting the process power and torque draw superimposed on the relevant motor capability curve. Such plots for an example mill, the SAG mill at Cadia (described by Dunne et …

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SAG Mill Optimization using Model Predictive Control

Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).

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Optimal Speed Control for a Semi-Autogenous Mill Based on ...

In a SAG mill, operation with variable speed presents significant advantages in terms of productivity and efficiency . However, as the speed increases, the load is partially lifted in the SAG mill . At operating speed, the expected torque with 30% load and 20% of balls reaches an overload trip in the SAG mill .

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Mining - Ingeteam

Successful commissioning of a variable speed drive for the SAG and Ball Mills of a copper mine in Nevada, USA The MV100 3400 HP, a UL certified variable speed drive of the INGEDRIVE ™ range, is integrated in the grinding system of a copper mine in Nevada, USA....

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Modelling SAG milling power and specific energy ...

the SAG mill critical speed; Pc = SAG mill power consumption (kW); % 600 +100 = % of the fresh feed in the size range 152 +25 mm. M. Silva, A. Casali/Minerals Engineering 70 (2015) 156–161 157 In fact the later can be modelled as a function of the others.

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Choosing the Right Motors for your Mills

effective for SAG mills –Variable speed for ball mills depends on the particular project and ore. Step 4: Select Speed •The rated speed of a motor is nominated by the engineer •The torque output of a motor is constant up to the rated speed •The power output of a motor is constant

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1 x SAG Mill & Siemens Motor

1 x SAG Mill & Siemens Motor For Sale/Re-Assignment Mill Details Type of Mill SAG Mill Mill Dimensions 11,582 mm x 7,759 mm (38' x 26') (D x L) Default Mill Speed 7.5-8.0 RPM Mill Speed 7.56-10.08 RPM Liners Excluded Mill Drive Motor Type Wrap Around (included) Mill Drive Motor Size 19,400 KW (26,016 hp) Variable Speed Drive Yes Max.

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Barrick Goldstrike Grinding Expert System - onemine

A secondary SAG discharge screen (+1/8 inch) closes the SAG circuit. The ball mill circuit is closed with 6 Krebs super D20 cyclones. Line 2 grinding circuit is comprised of a 24 by 12 foot 4000 horsepower Fuller variable speed SAG mill followed by a 16.5 by 30.5 foot 5000 horsepower Fuller ball mill.

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Ok Tedi plans for long term with SAG mill upgrades by ...

For SAG 2, Siemens supplies two 8 pole, high speed induction motors to replace the existing slip-ring motors, eliminating all brush or slip-ring related outages and maintenance activities. The four identical variable speed drives (VSD) operating all four mill motors are Sinamics Perfect Harmony GH180 units.

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Cycloconverter - an overview | ScienceDirect Topics

Variable Speed AC Drives. ... (SAG) mills with cycloconverter-fed synchronous motor drives in mining applications in Peru and Brazil are reported in [101]. Latest technological advances, applications, and future trends of cycloconverters in industrial medium-voltage …

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Stepping forward: Using variable speed drives for ...

Stepping forward: Using variable speed drives for optimising the grinding process in SAG and ball mills. ABSTRACT Comminution is usually the heaviest energy-consuming process in the mine site. These days when efficiency concerns are becoming more and more important, developing a reliable and highly efficient way to grind and crush ore is a new ...

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SAG Milling in Australia -Revised Submission

date in Australia. The Fimiston 10.97 m (36 ft) SAG mill uses twin wound rotor/gearbox/ pinion drives with variable speed achieved through CCV systems. The CCV – ring motor (gearless) drive is used at Cadia (20 MW) and Olympic Dam (18 MW). It has been the industry standard for SAG mills above 13 MW capacity. However,

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Major Mines & Projects | Mana Mine

The 7.92-m diameter by 2.74 m Allis Chalmers SAG mill is equipped with 2,387 kW variable speed motor and operates between 10-15% ball charges depending on ore hardness. Variable speed control provides additional flexibility for processing of various ore types. The discharge from the SAG mill is split between fine and coarse material.

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Condor Gold accelerates La India development with ...

The SAG mill is equipped with a variable speed drive to allow the mill to operate between 1,500 t/d and 2,300 t/d. Furthermore, it is possible to increase the daily throughput by increasing the motor size, as previously indicated. The 22% boost in throughput could potentially allow gold production to increase by a similar amount, the company said.

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ball mills variable speed drive

Stepping forward: Using variable speed drives for optimising the grinding process in SAG and ball mills. ABSTRACT Comminution is usually the heaviest energy-consuming process in the mine site. These days when efficiency concerns are becoming more and more important, developing a reliable and highly efficient way to grind and crush ore is a new ...

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Modelling: Transfer size limits - SAGMILLING

The model assumes all SAG mills are variable-speed; if a fixed-speed mill encounters this condition, it will completely grind out and operators will probably be forced to stop the SAG mill. Pick your mills sizes to avoid secondary mill limited conditions. This transfer size is …

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Mining - Grinding and Processing | WEG

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.

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Mineral Processing | Toshiba International Corporation ...

Fixed or Variable Speed Drives. Crusher Drives; Grinding Mill Drive Systems, SagBall etc; ... 1 x 11000kW SAG Mill driven by Dual 5500kW motors, 1 x 5500kW Ball Mill Equipment: 3 x 5500kW 6 pole 11000 volt Wound Rotor Induction Motors Location: Cloncurry, Queensland ...

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ABB Wins its First Variable-Speed Mill Drive Order in ...

The scope of supply includes three 7.4MW squirrel cage induction motors, ACS6000 frequency converters with mill application controller and remote diagnostic facilities, transformers, medium voltage cubicles, chiller units and system engineering for 3×30 foot diameter semiautogenous (SAG) mills. ABB's variable-speed ring-geared mill drive ...

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Ingeteam will supply VSD variable speed drive for the ...

The drive configuration for this project known as SBRS (Start Ball, Run SAG) meaning that the VSD is to soft- start with frozen charge detection the ball mill, run up to nominal speed, smoothly connect ball mill to the grid so that the ball mill is operating with fixed speed, then soft- start with frozen charge detection the SAG mill as well as ...

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Used Ball & Sag Mills for Sale | Mining | Surplus Record ...

32' x 18.75' , Egl Sag Mill With 15416 HP (11500 KW) Twin-pinion 5750 Kw Motors & variable speed Drive A M King Industries | Oroville, CA | Albert King | 530-53...

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THE ENGINEERING AND PROCESS EFFECTS OF CHOOSING A …

the mill speed as a fraction of the critical speed, ϕC, can be observed by plotting the process power and torque draw superimposed on the relevant motor capability curve. Such plots for an example mill, the SAG mill at Cadia (described by Dunne et al., 2001) is shown in Figure 3.

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Evolution of SAG Mill Process Control at the Xstrata ...

revealed a thermal limitation in the 3000hp LCI variable speed drive system at low mill speeds. This event resulted in variable speed operation being suspended, and the mill being operated at a fixed speed (76% of critical) until a thorough analysis of the event could be completed. DEVELOPMENT OF A SAG MILL CONTROLLER Owing to the highly ...

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STEPPING FORWARD: USING VARIABLE SPEED …

STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR OPTIMIZING THE GRINDING PROCESS IN SAG AND BALL MILLS *I. Atutxa and I. Legarra . Ingeteam Power Technology . Parque Tecnológico de Bizkaia, Edificio 110 . Zamudio, Vizcaya, Spain (*Corresponding author: inigo.atutxa@ingeteam)

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Major Mines & Projects | Bomboré Project

The SAG mill feed conveyor will be fitted with a weightometer in order to control the speed of the apron feeder and also to monitor mill feed tonnage. Grinding and Classification The grinding circuit will be a SSAG circuit comprising a single variable speed SAG mill. The SAG mill will operate in closed circuit with hydrocyclones while pebbles ...