Modelling SAG milling power and specific energy ...

Modelling SAG milling power and specific energy consumption including the feed percentage of intermediate size particles ... Even if the mill total load is a key variable and can be indi-rectly measured with bearing pressure measurements, it was ... the SAG mill critical speed; Pc = SAG mill power consumption ...

Get Price

variable speed sag mill feed conveyors

variable speed drive upgrade of the SAG mill. • lifter and grate passed onto the ball mill using a feed belt conveyor. The original stockpiled ahead of a fixed speed SAG mill, which discharges over a trommel screen with the undersize passing to the ball mill circuit. …

Get Price

STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR ...

STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR OPTIMIZING THE GRINDING PROCESS IN SAG AND BALL MILLS *I. Atutxa and I. Legarra . ... whole low and medium voltage range and from hundreds of kW up to tens of MW milling applications. These Variable Speed Drives (VSDs) can facilitate an optimum usage of power and system parameters in ...

Get Price

Model Predictive Control for SAG Milling in Minerals ...

Mill rotational speed may be variable, in which case increasing speed increases grinding capacity, since this increases the rise and subsequent fall of ore and media – provided the mill is not run up to critical speed. Mill speed variation has a large gain effect in terms of control and is important to compensate for variations in ore hardness.

Get Price

Autogenous mills, semi-autogenous mills and ball mills for ...

Autogenous mills, semi-autogenous mills and ball mills for wet grinding. A company of Polysius ThyssenKrupp ... variable speed capability comes with the drive as an inherent feature. Due to the ... Two SAG mills with rigid pinion drives. SAG mill

Get Price

Variable Speed Drive vs Fixed Speed Drive Mill

Feb 27, 2008· There are a number of reasons to select a variable speed drive for a SAG mill. If you seek optimal performance over the life of lifters in the mill, you need to modify mill speed as mill internal configuration wears. Your objective should be: 1. Optimize grinding performance - mfgrs don't know best mill speed.

Get Price

Drive Solutions for the Global Mining Industry - TMEIC

drive application is a dual-pinion SAG mill driven by two 5,000 kW wound rotor induction motors (WRIM). Two TMdrive-10SPRs 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…

Get Price

Used Mining Equipment | SAG Mills

Used Mining Equipment ColesMining.com provide comprehensive used equipment solutions used SAG Mills, used ball mills, used rod mills, used tower mills, used Svedala, used Allis Chalmers, used Krupp Polysius, used Mary, used Dominion Engineering, used , used Hardinge, used Denver, used Allis Chalmers, used Outotec, used , used Symonds, used Fuller Traylor, used Kemco, Dorr …

Get Price

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.

Get Price

SAG Mill - Feed The Beast Wiki

The SAG Mill is a block added by the EnderIO mod. A machine similar to a Pulverizer or a Macerator.It is used to process resources to produce dust. It accepts energy in the form of Redstone Flux or Minecraft Joule, with an internal buffer of 100,000 RF and consumption of 20 RF per tick.The energy storage capacity and processing speed can be increased by adding one of 3 tier of Capacitor into ...

Get Price

Understanding Variable Speed Drives (Part 2) | Electrical ...

Understanding Variable Speed Drives (Part 2) A thorough understanding of how to match the VFD to the driven load is the key to a successful application. Solomon S. Turkel | Apr 01, 1999. When applied properly, the variable frequency drive (VFD) is the most effective motor controller in the industry today. Modern VFDs are affordable and reliable ...

Get Price

SAG Mill - Semi-Autogenous Grinding Mill

The mill is driven by two GE horizontal synchronous variable speed motors, ... A line drawing of the Fort Knox SAG mill liner configuration and spare liners awaiting installation. Five and one quarter inch steel grinding balls - cannon balls - occupy 8% of the mill volume and are consumed in the grinding action at the rate of 600,000 pounds per ...

Get Price

Variable Speed Ball Mill - rolvaplast.be

SAG Mill Grinding Circuit Design. ball mill with variable speed india Mini Mill Cnc. A wide variety of mini mill cnc options are available to you, such as vertical, Micro Vertical Mini Milling Machine planetary ball mill laser cutting machine 550W Mill Drill Machine Variable Speed 180mm Headstock Travel Micro Milling The top supplying countries ...

Get Price

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

Get Price

SAG Mill Success—Start with the Basics - womp-int.com

The Hyper SER Drive can transfer to fixed speed mode during under-voltages, then transfer back to variable speed when the supply voltage stabilizes, ensuring no costly mill stops occur.” SAG mill breakdowns are costly events for producers.

Get Price

Variable speed SAG milling - store.cim.org

Variable speed SAG milling CIM Bulletin, Vol. 96, No. 1075, 2003 M.N. Brodie The ability to adjust the speed of a SAG mill offers benefits to the process and to equipment maintenance. It can be provided with some slight effect on availability ranging from somewhat enhanced to somewhat reduced, depending on the particular equipment that is used.

Get Price

SAG Mill Variable Speed Drive - 911metallurgist.com

A variable speed drive on large primary semi-autogenous mills can overcome this problem to a considerable degree. A major disadvantage of large semiautogenous mills has been the necessity to keep the mills fully loaded at all times to minimize ball and liner breakage.

Get Price

SAG Mill - Official Feed The Beast Wiki

The SAG Mill is a machine added by Ender IO. It uses Redstone Flux (RF) to grind (or mill) items into their crushed variants, like Ores into Dusts. The SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs.

Get Price

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,

Get Price

Variable Speed Sag Mill Feed Conveyors

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 NOT a prediction.

Get Price

VARIABLE SPEED SAG MILL ELECTRONIC DRIVES JPG

VARIABLE SPEED SAG MILL ELECTRONIC DRIVES JPG Railcar & barge handling - - VARIABLE SPEED SAG MILL ELECTRONIC DRIVES JPG ,E-mail: mineralsmetso Railcar Dumpers & Positioners , Variable Frequency Drives , frequency drive, sheaves, wire rope and electrical controls , 60 815 40 565 11?8 2430-24 25,000 19,200 24 326 20 810 11?8 Sp.1998 Com bined Au thor In dex IEEE In dus try …

Get Price

Performance enhancement tools for grinding mills - SAIMM

In recognition of ore variability, many current SAG mills are installed with variable speed drives, capable of operating the mill through a wide and continuous range of speed values. Mill speed and liner profile determine grinding media trajectories, as shown in Figure 1. By increasing mill speed or the steepness of liner attack angle,

Get Price

SINGLE STAGE SAG/AG MILLING DESIGN - Metallurgy

SINGLE STAGE SAG/AG MILLING DESIGN ABSTRACT Single stage semi-autogenous / autogenous (S/AG) milling has become a common design for a variety of ore ... However, with modern soft starting technology associated with the variable speed drive capabilities …

Get Price

Advantages of SER drives for SAG mills | GoHz.com

Dec 19, 2014· 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. ...

Get Price

Difference Between Sag Mill vs Ball Mill - mech4study

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.

Get Price

QdX4TM Mill Drive system

2 d4 TM Mill Drivesystem 7 MW 7 MW 14 MW 28 MW 7 MW 4 MW 7 MW 7 MW 7 MW 4 MW 7 MW 7 MW SAG mill 32 ft. single drive The natural progression in gear/pinion mill drives: The QdX4TM Mill Drive provides the next step in the evolution of change in mill drive architecture, while allowing the system to be built with components that are within current manufacturing capabilities.

Get Price

Used Sag-mills For Sale - amking.com

Buy used Sag-mills from A.M. King Industries. We can help guide you to the best solution for your equipment needs. 0. ... UNUSED OUTOTEC 24' x 17' (7.325m x 5.2m) EGL SAG Mill with 6,300 HP (4,750 kw) Variable Speed Drive. Manufacturer: OUTOTEC. Inventory ID: 6C-MI02. View Details.

Get Price

JET | Elite | Vertical Milling Machines | ETM-949

The game has changed, precision can’t just be an ideal, It has to be a fact. Elite machinery is the next generation that takes the best from the old, and adapts to move forward, redefining the industry standards of precision, durability and safety.

Get Price

SAG Mill Control: It Shouldnt be that Hard - womp-int.com

In this case, mill speed is the primary manipulated variable used to control mill load. While there is no generic control strategy for SAG milling there is a considerable amount of reusable engineering. In contrast to an expert or black box system, the control loop approach was built using standard blocks, connected as shown.

Get Price

Gearless AG/SAG mills -

Variable speed capability Removal of limits of design power gear and pinion drives are practically limited to about 10,000 hp per pinion. at this time, there is no reasonable gear drive alternative for more than two pinions or above 20,000 hp. the best solution is the gearless mill.

Get Price

KnowledgeScape

Currently because of hard ore conditions the SAG mill speed is run at in fixed speed mode only. In the future, if soft or fine ore conditions are restored, we will commission rules to control the SAG mill speed. Each decision cycle the expert system will calculate a change in the SAG mill speed set point.

Get Price

Variable Speed SAG Mill - 911metallurgist.com

Table of ContentsComminution Circuit DescriptionMill Availability and MaintenanceAdvantages and DisadvantagesVariable Speed SAG Mills Motor Capability vs Mill Capability The single line grinding circuit at Bond Gold’s Colosseum mine consists of variable speed drive semi-autogenous (SAG) milling and secondary grinding with a fixed speed ball mill.

Get Price

Case note ACS 1000 variable speed drive increases output ...

“Thanks to ABB’s ACS 1000 variable speed drive we are able to run the motor and the SAG mill at the required speed. We no longer have to deal with plant shutdowns and are able to expand the milling facility, increasing the output from originally 2,000 tpd to almost 8,000 tpd. The ACS 1000 fully meets our expectations.” ACS 1000 key data

Get Price

Variable Speed Sag Mill