a mill power equation for sag mills

a mill power equation for sag mills

A mill power equation for SAG mills SpringerLink

1990-2-1 where m p is in kW; D is internal mill diameter (meters), L is internal mill length (meters); J is total fractional charge loading of the mill; J B is the fractional mill filling by balls; ε B is the effective porosity of the charge, taken as 0.3; ρ s and ρ b are true densities of rock and balls (tons per cubic meter), respectively; w c is the weight fraction of rock in water and rock in ...

A mill power equation for SAG mills - OneMine

1991-1-1 Austin, L. G. (1991). A mill power equation for SAG mills. Citation Downloads Reference Manager (RIS) SpreadSheed (CSV) Austin, L. G. Organization: Society for Mining, Metallurgy Exploration Pages: 7 Publication Date: Jan 1, 1991 Email to a Friend Abstract Development of an equation for tumbling charge and balls plus comparison to plant data ...

Modelling SAG milling power and specific energy ...

2015-1-1 The main objective of this work is the development of mathematical models able to be used as predictive tools to optimise power consumption and/or specific energy in actual SAG mills, assuming that the ore competence was already included in the basic design of the mills (for example using DW i in the specific energy equation (Morrell, 2004 ...

AN UPDATED DATA SET FOR SAG MILL POWER MODEL

AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING.COM Logan Lake, Canada ABSTRACT This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world. The

SAG Mill Grinding Circuit Design - 911metallurgist

2016-6-6 This refers to high-aspect AG/SAG mills. Ball Charge Motion inside a SAG Mill. With a higher density mill charge. SAG mills have a higher installed power density

GROSS POWER CALCULATOR - SMC Testing

2020-3-24 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 mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

AG - Autogenous SAG Semi-Autogenous Mill Design

2018-4-17 Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semi-autogenous grinding, it can be used to establish the exact

TECHNICAL NOTES 8 GRINDING R. P. King

2009-7-30 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 ...

Grinding Mill Computer Model - ausimm

2021-6-24 Morgardshammar/Marcy equation. Mill diameter inside liners - D D = Dshell-0.15 Allowance for liners Approximate mill diameter is derived from: Power =5.*6115 DL24. 6* La= * D where a is the aspect ratio L/D derived from a regression equation on 25 manufacturers' mill size and power relationships For SAG mills the equation becomes Power=(5.6115 ...

Dynamic modelling and simulation of semi-autogenous

2009-1-1 The equation used to predict the power consumed by the mill (power-draw), M p, is based on a modification of Bond’s Law (Austin, 1990): (3) M p = K p D 2.5 L (1-A J) W V ϕ c 1-0.1 2 9-10 ϕ c where D (m) and L (m) are the mill dimensions, V (m 3) is the mill effective volume, ϕ c is the mill speed (fraction of critical speed), J is ...

A mill power equation for SAG mills - OneMine

1991-1-1 Austin, L. G. (1991). A mill power equation for SAG mills. Citation Downloads Reference Manager (RIS) SpreadSheed (CSV) Austin, L. G. Organization: Society for Mining, Metallurgy Exploration Pages: 7 Publication Date: Jan 1, 1991 Email to a Friend Abstract Development of an equation for tumbling charge and balls plus comparison to plant data ...

A comparison of SAG mill power models

SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating configuration. This paper will compare SAG mill models by Morrell, Loveday (using "Power Numbers" published by Barratt) and Austin against several published mill surveys.

AN UPDATED DATA SET FOR SAG MILL POWER MODEL

AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING.COM Logan Lake, Canada ABSTRACT This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world. The

GROSS POWER CALCULATOR - SMC Testing

2020-3-24 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 mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

Orway Mineral Consultants Canada Ltd. Mississauga, ON ...

2014-10-1 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

Autogenous and Semi-Autogenous Mills - ScienceDirect

2016-1-1 The operation of AG and SAG mills may be guided by the relation between maximum mill load and mill power as given in Equation and modified later by Morrell (Equation ). The following general remarks are of interest: 1. While starting a mill, a low power draw

Morrell C-model - SAGMILLING.COM

2020-3-22 Morrell C-model. 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.

Ball Mill Design/Power Calculation

2015-6-19 The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or

SAG Mill Process Control - Grinding Classification ...

2021-10-29 If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...

Publications - SMC Testing

2021-11-18 Power Draw Of Wet Tumbling Mills And Its Relationship To Charge Dynamics - Part 1 A Continuum Approach To Mathematical Modelling Of Mill Power Draw Power Modelling Of Stirred Mills Predicting The Overall Specifcie Energy Requirements Of AG SAG Ball Mill And HPGR Circuits On The Basis Of Small Scale Laboratory Ore Characterisation Tests

A comparison of SAG mill power models

SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating configuration. This paper will compare SAG mill models by Morrell, Loveday (using "Power Numbers" published by Barratt) and Austin against several published mill surveys.

(PDF) SAG mill power draw simulation using variance ...

Using Monte Carlo simulation showed that the mean power draw of Sarcheshmeh SAG mill is about. 9349.75 kW with a standard deviation of 983.2 kW, with the highest frequency occuring between 9058.5 ...

Mill power draw models - SAGMILLING.COM

2020-3-22 Mill Power Draw Models. The mill power draw models are used to predict how much power will be consumed by a particular type of mill, mill geometry and set of mill operating conditions. This power is transferred to the ore and used to predict the throughput when combined with the specific energy consumption models.

Ball Mill Design/Power Calculation

2015-6-19 The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or

THE ENGINEERING AND PROCESS EFFECTS OF

The SAG mill power draw model of Austin (using the calibration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive's mechanical components based on Doll (2012) are used to determine the motor output power, P. The effect of varying

The engineering and process effects of choosing a motor ...

2021-8-18 The SAG mill power draw model of Austin (using the cali-bration by Doll, 2013) is used to predict the process power draw at the mill shell, Pshell, and the efficiency losses for the drive’s mechanical components based on Doll (2012) are used to determine the motor output power, P. The effect of varying the mill speed as a fraction of the critical

Mill drives: the desire for increased power and the ...

2021-10-19 SAG mill drives (as GMDs) by some operators and principal motor designers/manufacturers until the reasons for known problems in design or manufacturing were better understood and resolved. Accordingly, the latest 40 ft dia. SAG mill is rated at 29 MW and 78% C.S., with a 42 ft dia. mill built but not yet operational. The more recent option

SAG Mill Process Control - Grinding Classification ...

2021-10-29 If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...

Energy Use of Fine Grinding in Mineral Processing ...

2013-12-18 This quantity is small compared to the power used by a semi-autogenous mill and a ball mill in a primary grinding circuit; a ball mill can have an installed power of up to 15 MW, while installed power for a SAG mill can go up to 25 MW. However, the

Publications - SMC Testing

2021-11-18 Power Draw Of Wet Tumbling Mills And Its Relationship To Charge Dynamics - Part 1 A Continuum Approach To Mathematical Modelling Of Mill Power Draw Power Modelling Of Stirred Mills Predicting The Overall Specifcie Energy Requirements Of AG SAG Ball Mill And HPGR Circuits On The Basis Of Small Scale Laboratory Ore Characterisation Tests

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