### 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 0.5 slope when plotted on log-log paper. This is because the particle size distribution (PSD), these mills

### 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 specific energy using Equation

### power calculation formula of sag mill - greenrevolution

PDF (1044 K) - Journal of Mining and Environment (JME) power index (SPI), and a formula for the SAG mill ... calculation of liner weight and volume at each stage ... a Starkey mill was used to measure SAG mill power.

### 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.

### improving power consumption in ball mill - YouTube

Sep 02, 2016· The cement mill is widely used in cement, silicate calculation of power consumption for ball mills and grinding calculation of power consumption for ball mills .

### 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 ...

### 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.

### sag mill mechanical design pdf - sc-pellegrinaggi.ch

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 (813) The net power is calculated from Net power KD25L e! c/ Watts (814) In equation 814, D is the diameter inside the mill liners and Le is the effective length of the mill including the

### Bibliography: Mill power draw models - SAGMILLING.COM

The three SAG mill models are benchmarked and reviewed in: Doll, A.G., A comparison of SAG mill power models, Procemin 2013; Austin SAG Model. The Austin SAG model was published in: Austin, L.G., A mill power equation for SAG mills, Minerals & Metallurgical Processing; Society for Mining, Metallurgy & Exploration, February 1990. Morrell Models

### Bond Mill Power Equation - YouTube

Apr 04, 2018· LG A mill power equation for SAG mills.power calculation formula of sag mill - greenrevolution power calculation formula of sag mill ?21 Jun 2013 ?mill charge load calculation ...

### Autogenous and Semi-Autogenous Mills - ScienceDirect

The designs of autogenous and semi-autogenous (SAG) grindings mills are described followed by the description of their methods of operation in grinding circuits involving crushers and ball mills. Methods of estimating SAG mill volumes, mill charges, feed size and power consumptions and optimum speeds of rotation during operation are described.

### MODELING THE SPECIFIC GRINDING ENERGY AND BALL .

MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL SCALEUP K. G. Tsakalakis & G.A. Stamboltzis NTUA Athens-Greece ... EQUATIONS GIVING THE MILL POWER DRAW, P The mill power draw P is a function of: 1. The fraction of mill filling f L 2. ... autogenous mills . 8 Present paper An effort to develop simple and efficient

### USING THE SMC TEST® TO PREDICT COMMINUTION .

USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT PERFORMANCE ... can be used to conduct 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 ... For coarse particle grinding in tumbling mills equation 1 is written as: 2 4 1x ...

### Power-based modelling of single-stage AG and SAG mill .

other methods. The ball mill correction factor (CFnet) is empirical and one way of estimating it was presented by Amelunxen at the Procemin 2013 Short Course by Doll & Amelunxen. The SGI equation uses a transfer size between a SAG and ball mill; it is proposed that a synthetic transfer size of 2100 µm be used to model single-stage SAG mills. 5.9ˇ

### A mill power equation for SAG mills

Development of an equation for tumbling charge and balls plus comparison to plant data suggests that the net mill power for cylindrical semiautogenous mills can be calculated from $${m_p} = ...

### Modelling SAG milling power and specific energy ...

Modelling SAG milling power and speciﬁc energy consumption including the feed percentage of intermediate size particles ... tumbling mills power equations have been derivate ... ables with the dependent variables SAG mill power and speciﬁc energy, to .

### SINGLE STAGE SAG/AG MILLING DESIGN - orway.au

SINGLE STAGE SAG/AG MILLING DESIGN Brian Putland 1, ... number of the largest SAG mills designed are installed in single stage configuration. This paper discusses the ... This puts the application in the realm of a single mill with gearless drive. xPower demand of more than 28 MW.

### Grinding mills -

Every mining operation has a unique grinding process. has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.

### 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.

### Advances in Discrete Element Method Application to ...

Advances in Discrete Element Method Application to Grinding Mills 119 to 2D non-spherical to 3D slice to 3D full (Cleary et al. 2003) the prediction of shoul-der angle, toe angle, power and vortex cen-ter increasingly improved. Obviously, these findings point in the direction of 3D DEM for full scale charge motion plus breakage studies.

### Choosing a SAG Mill to Achieve Design Performance

the correct power required to grind ore in a SAG mill, by developing ore hardness variability functions for the ore body to be mined. This paper describes the next step in the SAG design process, which is choosing a SAG mill to accomplish the required specified design performance.

### SAG Mill Grinding Circuit Design

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.

### GROSS POWER CALCULATOR - SMC Testing

GROSS POWER CALCULATOR General This model uses the equations from Morrell's 1993 PhD thesis: "The Prediction of Power Draw in Wet Tumbling Mills". The model is also described in detail in the book "Mineral Comminution Circuits Their ... Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry ...

### Model Predictive Control for SAG Milling in Minerals ...

Model Predictive Control for SAG Milling in Minerals Processing | 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure.

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