sag and ag mill power calculation

Modelling SAG milling power and specific energy ,

In these circuits the SAG mill is the largest energy consumer In many engineering projects either a power equation and/or a specific energy equation are used for the designing of these mills but not always with acceptable results

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CALCULATION OF BALL MILL GRINDING EFFICIENCY - Page 1 of 1

Mar 08, 2013· calculation of ball mill grinding efficiency dear experts please tell me how to calculate the grinding efficiency of a closed ckt & open ckt ball mill in literatures it is written that the grinding efficiency of ball mill is very less [less than 10%] please expalin in a n excel sheet to calcualte the same thanks sidhant reply

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Mill (grinding) - Wikipedia

SAG mills use a ball charge of 8 to 21% The largest SAG mill is 42' (128m) in diameter, powered by a 28 MW (38,000 HP) motor A SAG mill with a 44' (134m) diameter and a power of 35 MW (47,000 HP) has been designed Attrition between grinding balls and ore particles causes grinding of finer particl SAG mills are characterized by their ,

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OUTOTEC GRINDING TECHNOLOGIES

single-stage SAG mills to the largest mill in the world – with a 40-foot diameter and 28 MW of motor power Ball mills Ball milling is the most common application for horizontal tumbling mills Outotec offers a full range of ball mills to suit a wide variety of duties, from a few hundred kW all the way up to 20 MW and beyond Rod mills

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Calculation of Sag & Tension in Transmission Line - for ,

Calculation of Sag and Tension at an unequal level supports In hilly areas or sloping grounds, the supports are not usual at the same level For the calculation of sag and tension at unequal supports level consider a conductor AOB The portion of OA and OB may be treated as catenaries of half span x and l-x respectively shown in the figure ,

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SINGLE STAGE SAG/AG MILLING DESIGN

SAG mill (4% ball charge, 90% Nc) A cross between AG and SAG for average competency, abrasive or Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground), Kloof, Jacobina 6 SAG mill with recycle crusher (8 – 15% ball charge) Competent ores, better suited to coarse grind siz High aspect mills are recommended to ,

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SAG mills (semi-autogenous grinding mills) -

Gearless mill drive (GMD) technology has further expanded the use of large SAG milling allowing to produce the world's largest SAG mill of 42’ in diameter drawing power at 28 MW Today, is the world leading supplier of gearless SAG mills operating globally

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sag mill ball charge calculation

AG Autogenous & SAG Semi-Autogenous Mill Design Calculations A ball charge volume which is lower than those tested has been selected in order to minimize wear Obviously, the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method, but the overall total is 995% of the predicted total

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Sag and Tension Calculations - Refinements and ,

span sag and tension data This substitution introduces unnecessary errors, inefficiencies, and/or increased costs in the line design Additionally, the actual spans are rarely, if ever, level spans as implied in the ruling span calculations These calculations are fully integrated into the main program and do not require reruns or

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USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT ,

AG/SAG mill and crusher circuit simulations through the use of JKSimMet Independent of this it can be used in power-based calculations, which in conjunction with the Bond ball work index test, enable the prediction of the specific energy of comminution circuits where such circuits include combinations of any of the following equipment:

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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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Modelling: Transfer size limits - SAGMILLINGCOM

For example, the SAG mill may have 10 MW of power draw available and the two ball mills each of 75 MW of power draw available for a total of ratio of 10:15 (1:15) The software uses the particular power model (Bond/Barratt, Morrell Mi, etc) to determine what is the transfer size where the ratio of E SAG to E ball matches the ratio of mill ,

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A Method of C alculating Autogenous/ Semi-Autogenous ,

stage ball mills, rod mills or AG/SAG mills when calculating power according to the Bond Third Theory method Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 05 slope when plotted on log-log paper This is because the particle size distribution (PSD), these mills

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SAGMILLINGCOM : Home

Sagmilling is home to a collection of both free and subscription-based calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools, including for SAG mill-ball mill circuits, and geometallurgy energy models are available to subscribers

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Starkey & Associates Inc - Leaders in Comminution Design

= AG/SAG Specific Pinion Energy from a F 80 of 1524 mm to a T 80 of 17 mm, kWh/ton ground revs = Cumulative number of SAG test mill revolutions to 80% passing 17mm m s = SAG mill feed sample mass, grams The ball mill pinion energy is determined from the Bond the Third Theory of Comminution : S d-BWI = 1102 * 445 / (P cs 023 G pb 082 ,

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Model:Bond/Barratt SABC Models - SAGMILLINGCOM

As with most models, the power split between the SAG and ball mills is evaluated and the transfer size (T 80) necessary to balance the power draw between the two stages is estimated If that transfer size is within the specified limits, then the calculation proceeds to calculate the E SAG ,

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SAG mill optimisation using power-based simulations | Ausenco

SAG mill optimisation using power-based simulations Author Dr Rajiv Chandramohan, Robert Braun, , SAG mill slurry pooling model to predict the onset and effect of slurry pooling for varying operating conditions ; , validating the calculation improvements Comparisons of actual and predicted data show improved response of the program for ,

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Optimizing your SAG mill operation - International Mining

It is imperative to ensure the efficient removal of both slurry and coarse pebbles (critical size) in order to ensure the efficient operation of AG/SAG mills Elimination of the above mentioned material transport problems will allow the mill to respond truly in terms of power draw for changes in mill load which depends on feed ore characteristics

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O I SKARIN N O TIKHONOV CALCULATION OF THE ,

circuit power requirements for autogenous and semiautogenous milling The method is widely used by RIVS in extended calcula-tions at early design stag The article is composed of sections successively informing on the existing techniques of sizing SAG mill power, Bond work in-dexes and their applicability to calculating autogenous/semiau-

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Improved mill control at Lihir Gold Mine in Papua New ,

At the Lihir Gold Mine, the plant was utilizing mill’s bearing pressure to calculate load measurement for the SAG mill in HGO1 The use of SAG mill weight for process control is additionally complicated at Lihir by compromised and suddenly drifting load cell and bearing pressure measurements on two of the process plant’s three SAG mills

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Sag in a Transmission Line: What is it? (And How To ,

Oct 25, 2020· The calculation of sag and tension in a transmission line depends on the span of the overhead conductor Span having equal level supports (ie towers of the same height) is called level span Conversely, when the span has unequal levels of support, this is known as unequal level span

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20150821 Morrell Method-GMG-ICE-v01-r01 Morrell method ,

bling mills (AG/SAG, rod, and ball mills) involved in reducing the size of the primary crusher product to that of the final product (usually the cyclone overflow of the last stage of grinding prior to flotation/leach-ing) 2 Feed rate to the circuit (dry tonnes/h) 3 Power draw of the comminution equipment (kW)

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sag mill calculations cone crusher turkmenistan

sag and ag mill power calculation ball mill sizing calculations spreadsheet ball mill work calculation xls bgcateringnl ball mill designpower calculation 911 metallurgist the basic parameters used in ball mill design power calculations, rod mill mill sizing are material to be ground, characteristics, bond workcalculation of ball mill

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How to Calculate Property Tax Using Mill Rate | Finance ,

Oct 31, 2018· Tip One mill by definition equals 1/1,000 of $1, or $1 of tax for every $1,000 of value A property is typically subject to different mill rates from more than one jurisdiction, such as the ,

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Orway Mineral Consultants Canada Ltd Mississauga, ON ,

The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to - determine the specific energy of an industrial SAG mill The test is operated in closed circuit and the time required to grind the material to a P 80 of 17 mm is used to predict AG/SAG ,

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AG/SAG/Ball Mill - metengineer

AG/SAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for Autogenous Grinding (AG), Semi-Autogenous Grinding (SAG) and Ball Mills Exit Mill Calculator Shell Sizing Parameters Parameters Value Value Mill Shell Inside Diameter: [m] [ft]

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What is Sag & Tension in transmission lines & Formula ,

Sag and Tension: Sag is an interesting topic to discussWe generally see a lot of overhead lines on our waySag in general words can be said that distance between the highest point of electric poles or towers and the lowest point of a conductor connected between two poles or towersYou will know how to calculate sag and sag formula

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Sag in Overhead Transmission Line and Its Calculation ,

Dec 07, 2018· Calculation of Sag: As discussed earlier in this post, enough Sag shall be provided in overhead transmission line to keep the tension within the safe limit The tension is generally decided by many factors like wind speed, ice loading, temperature variations etc Normally the tension in conductor is kept one half of the ultimate tensile ,

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Ball Mill Design/Power Calculation

Dec 12, 2016· If P is less than 80% passing 70 microns, power consumption will be Ball Mill Power Calculation Example A wet grinding ball mill in closed circuit is ,

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