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Milling - Energy intensive and high maintenance

the start-up. Figure 5. The WRIM + LRS is causing high transient torques during the start-up. Based on a study done by Anglo Technical Division, presented in a technical paper on the occasion of the SAG 2006 in Vancouver, B. C. Canada: "Lessons learnt from recent failures of gear drives on mills .

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SAG mill continually pump the finer material out of the mill, lowering the total amount of residual fine ore and thus improving the situation in respect to locked charge starts. Overflow ball mills are at a significantly higher risk of locked charge starts because the large amount of fines in the mill have a propensity to lock

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problems facing sag mills - sepkids

Sag Mills Facing SAG Mill Success—Start with the Basics . Products for the care and feeding of SAG mills range from preventive maintenance- oriented items such. bal and sag mills cemtex multirent-properties . Coal mill is the machine used in cement plant.Cement mill manufacturer supplies coal mill, bal and sag mills cemtex; problems facing ...

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SAG Mill Grinding Circuit Design

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

In the island state of Papua New Guinea, Ok Tedi Mining Limited (OTML) runs the copper and gold mine Ok Tedi. OTML's drive train infrastructure at the Ok Tedi mine is in excess of 30 years old. In order to ensure long term profitability, OTML is using Siemens technology to supply and install complete new variable speed drive trains for the two Semi-Autogenous Grinding mills SAG 1 and SAG 2.

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ball mills, the starting torque restrictions of some of the newer mill drive configurations, and the softness of some utility services. This paper looks at the serviceability and economics of five different mill motor options to meet these restraints. Some approaches are new, some are old standards, and some, like the

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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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Mill (grinding) - Wikipedia

SAG is an acronym for semi-autogenous 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' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.

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Outotec Grinding technologies

autogenous (SAG) mills, autogenous (AG) mills, ball ... pad to lift the mill for start-up and low pressure oil is ... Outotec Grinding technologies 007 the mill drive train to be brought closer to the mill, which in turn allows for smaller foundations and lower installation costs.

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Fast Smelting Options? : SkyFactory - reddit

Crushers turn sand to dust. (SAG mill turns sand to silicon when you need that.) Use compacting drawers to make compacted gravel, sand, and dust, feed that to auto heavy seive, use more compacting drawers to make chunks into ore, SAG mill ore to get two piles of grit per ore, then put the grit into an alloy furnace or Tinker's smeltery.

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LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the effective length of the mill including the ...

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The iBolt | The Intelligent Bolt for SAG Mill Relines

The Intelligent Mill Liner Bolt. Up until now, SAG mill operations have lacked the means to intelligently determine mill liner replacements, other than the "blind" option of shutting down production, clearing the feed chute and doing a full, physical inspection of the mill lining and its wear depth.

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(PDF) Real-Time Simulation and Control of a SAG Mill

Real-Time Simulation and Control of a SAG Mill. ... and FactoryTalk R are integrated to simulate a control strategy for a SAG mill designed to keep the mill operating in the stable region by ...

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Choosing a SAG Mill to Achieve Design Performance

sized SAG mill may prevent production losses that would be many times greater over the extended start up period. This is the direct result of choosing the proper SAG mill at the start. INTRODUCTION The sequential steps required for the design of any grinding circuit, .

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Gold Fields Granny Smith Grinding Circuit: A Metallurgist ...

After closed-circuit secondary crushing, the SAG mill feed 80% passing (F80) size was 25 mm to 30 mm. Installed grinding power is split equally between the two mills with the SAG mill fitted with a variable speed drive (VSD). SAG discharge screen oversize ('pebbles' or 'scats') was .

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to Build Largest SAG Mill for Newmont's Minas Conga ...

E&MJ reported in October 2010 (See "SAG Mill Gearless Drives Go to South American Projects,"p. 102) ABB Group's Minerals Division had won an order from Newmont Mining Corp. to engineer three gearless mill drive (GMD) systems to be installed at its Yanacocha Minas Conga oxide copper-gold project in .

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Mining Processing | TMEIC

Ball and SAG Mills. Ball and SAG mills form the heart of many mining processes. Drive systems used must be very reliable. Drives are often required to produce high torque (typically 150% of rated or more) during starting. Frequently mills turn at constant speed, but must be started on weak power systems.

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SAG Mill Testing - Test Procedures to Characterize Ore ...

SAG MILL TESTING - AN OVERVIEW OF THE TEST PROCEDURES AVAILABLE TO CHARACTERIZE ORE GRINDABILITY AUTHOR: F.O. VERRET, G. CHIASSON AND A. MCKEN - SGS KEYWORDS Comminution, grindability, grinding, SAG mill, AG mill, milling, HPGR, work index, pilot plant INTRODUCTION The resistance of ore samples to breakage (or hardness) is measured

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how to use a sag mill - sbm-impactcrusher

The use of this grinding ... The task therefore shifts from SAG mill design, to how many tonnes will the given SAG mill grind in one hour. SAG Mill Success—Start with the Basics - . SAG mills are often flexible enough to accomplish the same size reduction provided by two or three stages of crushing and screening, a rod mill, and some or all ...

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Selecting Motor Controls for Mining Process Torque .

Selecting Motor Controls for Mining Process Torque Demands Slide 4 Selecting Motor Controls for Mining Process Torque Demands Controlling Speed •Some processes work well at fixed speed – control for these motors is focused on reliable, safe starting. •Some processes can benefit from variable speed - control for motors is

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SAG Milling in Australia -Revised Submission

MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia.

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