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mill power draw calculations by steve morrel

Power Draw Of Wet Tumbling Mills And Its Relationship To Charge Dynamics - Part 2 An Empirical Approach To Modelling Of Mill Power Draw Predicting SAG AG Mill And HPGR Specific Energy Requirements Using The SMC Rock Characterisation Test Predicting The Overall Specifcie Energy Requirements Of AG SAG Ball Mill And HPGR Circuits On The Basis Of ...

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how to calculate the ball mill speed

Ball Mill Critical Speed Mineral Processing. 2020-6-25 A Ball Mill Critical Speed (actually ball, rod, AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell's inside surface and no balls will fall from its position onto the shell.

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semi autogenous mills and ball mills, professional jaw ...

Semi Autogenous Grinding Mills Ghana - Semi Autogenous Grinding Mills Ghana. To predict the power draw of sag mills the design and operating data for a variety of mills were taken from the proceedings of the international autogenous and semi-autogenous grinding technology sag 96 mular et al1996 held at vancouver, canada in 1996he data lacked certain information, which for the simulation ...

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The influence of mill speed and pulp density on the ...

The absorbed power is calculated by multiplying the torque on the driving shaft with the shaft speed (rad/sec) and hence excludes any losses associated with the gearbox and motor. The pulp weight in the mill is obtained by subtracting the mill weight during the test from the empty mill weight, including the ball charge, at the start of the test ...

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can you effectively run SAG mill with the only power draw ...

To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone else's ...

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Quantifying and improving the power efficiency of SAG ...

Feb 01, 1994· Prudent design practice dictates that a more conservative estimate of around 1.1 was used as input to the economic models. The JKSimMet package does not include in its output the power requirements of either the SAG mill or the ball mill models. It is necessary to calculate the power draw of the various simulated mills using other techniques.

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ball mill motor hp calculation

The ball mill motor power requirement calculated above as 1400 HP is the power that must be applied at the mill drive in order to grind the tonnage of feed from one size distribution. The . Get Price. how does ball mill works palestra-oefentherapie. power draw calculator of ball mill - the-specialists. Ball Mill Design/Power Calculation.

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Morrell C-model - SAGMILLING.COM

Applies to both SAG and ball mills, with variants for grate-discharge and overflow mills. This model was developed as part of the PhD thesis of Stephen Morrell at the University of Queensland and is the model used in the JK SimMet software for determining mill power draw.

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GROSS POWER CALCULATOR - SMC Testing

(slurry pool) is predicted from mill design and slurry flow data and its impact on power draw is then predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge

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Application of Operating Work Indices in Autogenous ...

power draw of AG/SAG and ball mills. Note that the ball mill operating work index is applied only on the portion that needs the additional grinding (Q2), which renders to the AG/SAG mill the credit for the fraction of the material that had been already ground to final product (Q1). To calculate .

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Modelling SAG milling power and specific energy ...

the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or specific energy model which do not con-sider the projected feed size distribution it is likely that this mill will reach the expected power .

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Grinding mills: how to accurately predict their power draw

As part of the development of a general simulation model for semiautogenous (SAG) mills it was found necessary to have mill power equations for the large D/L (pancake) type of SAG mill popular in ...

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Modelling SAG milling power and specific energy ...

the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or specific energy model which do not con-sider the projected feed size distribution it is likely that this mill will reach the expected power .

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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 1.7 mm is used to predict AG/SAG .

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sag mill design calculations

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. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been ...

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Module3 - AppE - SAG Mill Power Draw | Mill (Grinding ...

For maximum power draw equal to 100 (say, %, or relative kW capability), then: 100 (%) = Constant x (0.375 1.333 x 0.375^2) Solving again, Constant = 533.3 So finally, the relative SAG mill power draw formula for a mill which draws 100 (%) of its power draw capability at 37.5 % loading is: = 533.3 x (Vp 1.333Vp^2) A plot of this curve is ...

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mill power draw calculations by steve morrel

Power Draw Of Wet Tumbling Mills And Its Relationship To Charge Dynamics - Part 2 An Empirical Approach To Modelling Of Mill Power Draw Predicting SAG AG Mill And HPGR Specific Energy Requirements Using The SMC Rock Characterisation Test Predicting The Overall Specifcie Energy Requirements Of AG SAG Ball Mill And HPGR Circuits On The Basis Of ...

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Difference Between Sag Mill vs Ball Mill - mech4study

Oct 12, 2017· In ancient time, the mills were operated with muscle power (by hands), water animals and wind. They were totally based on the mechanical energy by natural resources and living beings.There are many types of mills which are used in the grinding industries. Today we will discuss about two important mill, sag mill and ball mill.

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MacPherson Autogenous Grindability Test | Mining | SGS

The mill power draw, throughput and product size distribution are used to compute a specific energy input and the MacPherson autogenous work index (AWI). Although the importance to achieve steady-state in a grinding test is widely accepted (Bond tests), the MacPherson test remains the only small-scale AG/SAG mill test that offers this option.

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O. I. SKARIN N. O. TIKHONOV CALCULATION OF THE .

Decision-making on selection of SAG mills increasingly uses the methods of sizing the milling power based on laboratory tests on grindability of minerals. This article considers one of such methods allowing determination of mill characteristics based on the Bond work indexes of .

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Power-based grinding models for design and geometallurgy

Oct 13, 2013· Dobby & Starkey method using a timed laboratory SGI Mill for SAG milling. Peter A. Day 2 08:30-10:30 Non-standard particle size distributions, the phantom cyclone and ball mill CF factors, geometallurgy and sampling an orebody. Alex D. 10:30-11:00 Coffee break AM 11:00-12:30 Mill power draw models for ball mills and SAG mills. Alex D.

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AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

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Operating work index is not the specific energy consumption

Oct 24, 2018· To calculate the operating work index of a circuit, you must measure four things: P: The power draw of the mill. This is usually calculated from the input leads to the motor, then multiplied by ...

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TECHNICAL NOTES 8 GRINDING R. P. King

approach to modeling of mill power draw. Trans. Instn. Mining. Metall. (Sect C:Mineral Processing Extr Metall.) 105, January-April 1996 ppC54-C62. Austin 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 ...

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SAGMILLING.COM .:. Mill Critical Speed Determination

The mill critical speed will be calculated based on the diameter (above) less twice this shell liner width. Mill Actual RPM: Enter the measured mill rotation in revolutions per minute. Result #1: This mill would need to spin at RPM to be at critical speed.

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ball load calculation in ball mills

Calculation of the power draw of dry multi-compartment ball mills 223 Where gross power is the power input to the motor, no-load power is the power. Published in: Physicochemical Problems of Mineral Processing · 2004Authors: ... how to calculate sag mill ball charge BINQ Mining.

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Simple Calculations for Cable Pulling | EC&M

Sample power feeder installation. Suppose you're involved in a design/build project for a paper mill and your client needs a 400A, 15kV feeder to run as shown in Fig. 1 (right). The client has required all feeders on the site to be pull-in-pull-out type in galvanized rigid steel (GRS) conduit.

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Ball Mill Power draw - Grinding & Classification Circuits ...

To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone else's ...

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sag mill design calculations

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. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been ...

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ball load calculation in ball mills

Calculation of the power draw of dry multi-compartment ball mills 223 Where gross power is the power input to the motor, no-load power is the power. Published in: Physicochemical Problems of Mineral Processing · 2004Authors: ... how to calculate sag mill ball charge BINQ Mining.