## SAG mill optimisation using powerbased simulations |

SAG mill optimisation using powerbased simulations Author Dr Rajiv Chandramohan, Robert Braun, Greg Lane Paper presented by Dr Rajiv Chandramohan at Comminution '18, Cape Town, South Africa, April 2018 ABSTRACT Ausenco’s Ausgrind comminution program has been the inhouse design tool used on a number of successful projects and technical studies In recent years, Ausgrind has been

## AG Autogenous & SAG SemiAutogenous Mill Design

Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG & SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semiautogenous grinding, it can be used to establish the exact grinding circuit and mill size In the pilot plant tests, the tare power of the pilot plant mills should be determined

## (PDF) Powerbased comminution calculations using Ausgrind

Some design methods (Lane et al, 2013, Morrell, 2004, Siddall & Putland, 2007 predict the total comminution energy requirements of SAG millbased circuits using work indices measured in

## Ball Mill Design/Power Calculation

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 pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed

## : Home

Internetbased calculations and energy models for mineral comminution Sagmilling is home to a collection of both free and subscriptionbased calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools, including for SAG millball mill circuits, and geometallurgy energy models are available to subscribers The online library of

## 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 In general these equations are used to predict power consumption as a function of mill size, level and density of the internal charge and % of critical speed

Cited by: 15## Modelling SAG milling power and specific energy

· SAG mill power consumption (Pc) in kW, in 4 grinding circuits (GC1 to GC4) However, if the evident effect of the particle size distribution of the feed is not considered, the SAG mill design would be at least in risk On the other hand, the power model developed in this work presents a quite good estimation capability and has the possibility to be used for many applications, but not for

Cited by: 15## (PDF) Powerbased comminution calculations using

Some design methods (Lane et al, 2013, Morrell, 2004, Siddall & Putland, 2007 predict the total comminution energy requirements of SAG millbased circuits using work indices measured in

## : Home

Internetbased calculations and energy models for mineral comminution Sagmilling is home to a collection of both free and subscriptionbased calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools, including for SAG millball mill circuits, and geometallurgy energy models are available to subscribers The online library of

## 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 In general these equations are used to predict power consumption as a function of mill size, level and density of the internal charge and % of critical speed

## Modelling SAG milling power and specific energy

· SAG mill power consumption (Pc) in kW, in 4 grinding circuits (GC1 to GC4) However, if the evident effect of the particle size distribution of the feed is not considered, the SAG mill design would be at least in risk On the other hand, the power model developed in this work presents a quite good estimation capability and has the possibility to be used for many applications, but not for

## Powerbased grinding models for design and geometallurgy

Powerbased grinding models for design and geometallurgy When: 14 15 11:0012:30 Mill power draw models for ball mills and SAG mills Alex D 12:3013:30 Lunch 13:3015:00 (tutorial) Example calculation in the software; use a preloaded set of test results to run a mill sizing exercise using the Bond/Barratt method Alex D 15:0015:30 Coffee break PM 15:3017:00

## : Articles

· An updated data set for sag mill power model calibration 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

## A Method of C alculating Autogenous/ SemiAutogenous

SAG mill energy required according to this statement, is 25 times more than the Ab value to produce the same degree of particle breakage There is a speci ﬁ c gravity factor that affects AG/SAG power draw The lighter material, in the 25 speciﬁ c gravity (SG) range, will require more energy to grind to the same transfer size than an ore with a 35 SG This fact is not evident in the

## GEOMETALLURGY APPLIED IN COMMINUTION TO MINIMIZE DESIGN RISKS

specific energy requirements of SAB (SAG and ball mill) and SABC (SAG and ball mill withpebble crushing) circuits for mill design purposes Ultimately, an example is presented to demonstrate the application of this method can be used to evaluate and minimize design risks

## Ball Mill Design/Power Calculation LinkedIn

· 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

## TECHNICAL NOTES 8 GRINDING R P King

LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 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

## : Articles

An updated data set for sag mill power model calibration 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

## AMIT 135: Lesson 6 Grinding Circuit – Mining Mill

Design features of grinding equipment (SAG, BALL and ROD MILLS) Energy and power calculations based on Bonds Work Index (Wi, normally expressed in kWh/ short ton) Other established methods, for instance Hardgrove Index, population balance Scale Up in Sizing for Grinding Mills Scaleup criterion is the net specific power consumption, ie the power consumed by the mill rotor itself minus

## A Method of C alculating Autogenous/ SemiAutogenous

SAG mill energy required according to this statement, is 25 times more than the Ab value to produce the same degree of particle breakage There is a speci ﬁ c gravity factor that affects AG/SAG power draw The lighter material, in the 25 speciﬁ c gravity (SG) range, will require more energy to grind to the same transfer size than an ore with a 35 SG This fact is not evident in the

## TECHNICAL NOTES 8 GRINDING R P King

LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 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

## How grinding mill design changed over the last 30 years

· The design of such grinding mills is extremely critical, requiring sophisticated software tools, proprietary calculation worksheets, and experienced technical engineers and drafters This blog will review how the mill design process has changed over the last 30 years While most of the changes have been positive, new issues and problems have risen in the process

## Sample Calculation of Sag and Tension of Transmission

· January 13, 2018 Engineering Guides / Overhead Power Lines / Power Lines / Sag and Tension Sample Calculation of Sag and Tension of Transmission Line – Even Elevation Posted by admin This is an example calculation for sag and tension in transmission line You may opt to review first the fundamental principles and formulas from the previous post Creep is not considered as a

## Energy and Cost Comparisons of HPGRbased Circuits |

The collected SAG feed sample was prepared for pilotscale HPGR and stirred mill testing to determine the key operating parameters for flowsheet design and powerbased calculations Ultimately, the simulation and test results allowed for the direct comparison of the energy and costs for three circuits

## SAG Calculator | Edmund Optics

SAG Calculator View All Technical Tools Radius of Curvature (mm): Diameter (mm): Sag (mm): $$ \text{SAG} = R \sqrt{R^2 \left( \frac{D}{2} \right)^2} $$ R : Radius of Curvature: D : Diameter: Description Determine the sag of a surface based on radius of curvature and diameter Related Product Category: Optical Lenses View All Now Was this content useful to you? Thank you for rating

## Alex G Doll Consulting Ltd

Metallurgical engineering calculations; Globally recognized specialist in mineral grinding ; Online powerbased grinding circuit design and benchmarking software wwwsagmilling example; Circuit benchmarking and debottlenecking audits for operating mines example; Short courses For operators, courses on operating SAG & ball mill circuits example; For plant design, courses on powerbased

## Alex Doll Principal Consultant Alex G Doll Consulting

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 The purpose of the comparison is to identify the

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## SAG mill optimisation using powerbased simulations |

SAG mill optimisation using powerbased simulations Author Dr Rajiv Chandramohan, Robert Braun, Greg Lane Paper presented by Dr Rajiv Chandramohan at Comminution '18, Cape Town, South Africa, April 2018 ABSTRACT Ausenco’s Ausgrind comminution program has been the inhouse design tool used on a number of successful projects and technical studies In recent years, Ausgrind has been

## AG Autogenous & SAG SemiAutogenous Mill Design

Table of ContentsSAG Mill ChargeSAG Mill Horsepower — Drive PowerOre Testing for AG & SAG Grinding Mill Design Mill Sizing: After laboratory and pilot plant testing confirm the feasibility of autogenous or semiautogenous grinding, it can be used to establish the exact grinding circuit and mill size In the pilot plant tests, the tare power of the pilot plant mills should be determined

## (PDF) Powerbased comminution calculations using Ausgrind

Some design methods (Lane et al, 2013, Morrell, 2004, Siddall & Putland, 2007 predict the total comminution energy requirements of SAG millbased circuits using work indices measured in

## Ball Mill Design/Power Calculation

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 pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed

## : Home

Internetbased calculations and energy models for mineral comminution Sagmilling is home to a collection of both free and subscriptionbased calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools, including for SAG millball mill circuits, and geometallurgy energy models are available to subscribers The online library of

## 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 In general these equations are used to predict power consumption as a function of mill size, level and density of the internal charge and % of critical speed

## Modelling SAG milling power and specific energy

· SAG mill power consumption (Pc) in kW, in 4 grinding circuits (GC1 to GC4) However, if the evident effect of the particle size distribution of the feed is not considered, the SAG mill design would be at least in risk On the other hand, the power model developed in this work presents a quite good estimation capability and has the possibility to be used for many applications, but not for

## (PDF) Powerbased comminution calculations using

Some design methods (Lane et al, 2013, Morrell, 2004, Siddall & Putland, 2007 predict the total comminution energy requirements of SAG millbased circuits using work indices measured in

## : Home

Internetbased calculations and energy models for mineral comminution Sagmilling is home to a collection of both free and subscriptionbased calculation tools to aid metallurgical process engineers perform comminution calculations Grinding circuit design tools, including for SAG millball mill circuits, and geometallurgy energy models are available to subscribers The online library of

## 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 In general these equations are used to predict power consumption as a function of mill size, level and density of the internal charge and % of critical speed

## Modelling SAG milling power and specific energy

· SAG mill power consumption (Pc) in kW, in 4 grinding circuits (GC1 to GC4) However, if the evident effect of the particle size distribution of the feed is not considered, the SAG mill design would be at least in risk On the other hand, the power model developed in this work presents a quite good estimation capability and has the possibility to be used for many applications, but not for

## Powerbased grinding models for design and geometallurgy

Powerbased grinding models for design and geometallurgy When: 14 15 11:0012:30 Mill power draw models for ball mills and SAG mills Alex D 12:3013:30 Lunch 13:3015:00 (tutorial) Example calculation in the software; use a preloaded set of test results to run a mill sizing exercise using the Bond/Barratt method Alex D 15:0015:30 Coffee break PM 15:3017:00

## : Articles

· An updated data set for sag mill power model calibration 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

## A Method of C alculating Autogenous/ SemiAutogenous

SAG mill energy required according to this statement, is 25 times more than the Ab value to produce the same degree of particle breakage There is a speci ﬁ c gravity factor that affects AG/SAG power draw The lighter material, in the 25 speciﬁ c gravity (SG) range, will require more energy to grind to the same transfer size than an ore with a 35 SG This fact is not evident in the

## GEOMETALLURGY APPLIED IN COMMINUTION TO MINIMIZE DESIGN RISKS

specific energy requirements of SAB (SAG and ball mill) and SABC (SAG and ball mill withpebble crushing) circuits for mill design purposes Ultimately, an example is presented to demonstrate the application of this method can be used to evaluate and minimize design risks

## Ball Mill Design/Power Calculation LinkedIn

· 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

## TECHNICAL NOTES 8 GRINDING R P King

LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 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

## : Articles

An updated data set for sag mill power model calibration 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

## AMIT 135: Lesson 6 Grinding Circuit – Mining Mill

Design features of grinding equipment (SAG, BALL and ROD MILLS) Energy and power calculations based on Bonds Work Index (Wi, normally expressed in kWh/ short ton) Other established methods, for instance Hardgrove Index, population balance Scale Up in Sizing for Grinding Mills Scaleup criterion is the net specific power consumption, ie the power consumed by the mill rotor itself minus

## A Method of C alculating Autogenous/ SemiAutogenous

SAG mill energy required according to this statement, is 25 times more than the Ab value to produce the same degree of particle breakage There is a speci ﬁ c gravity factor that affects AG/SAG power draw The lighter material, in the 25 speciﬁ c gravity (SG) range, will require more energy to grind to the same transfer size than an ore with a 35 SG This fact is not evident in the

## TECHNICAL NOTES 8 GRINDING R P King

LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 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

## How grinding mill design changed over the last 30 years

· The design of such grinding mills is extremely critical, requiring sophisticated software tools, proprietary calculation worksheets, and experienced technical engineers and drafters This blog will review how the mill design process has changed over the last 30 years While most of the changes have been positive, new issues and problems have risen in the process

## Sample Calculation of Sag and Tension of Transmission

· January 13, 2018 Engineering Guides / Overhead Power Lines / Power Lines / Sag and Tension Sample Calculation of Sag and Tension of Transmission Line – Even Elevation Posted by admin This is an example calculation for sag and tension in transmission line You may opt to review first the fundamental principles and formulas from the previous post Creep is not considered as a

## Energy and Cost Comparisons of HPGRbased Circuits |

The collected SAG feed sample was prepared for pilotscale HPGR and stirred mill testing to determine the key operating parameters for flowsheet design and powerbased calculations Ultimately, the simulation and test results allowed for the direct comparison of the energy and costs for three circuits

## SAG Calculator | Edmund Optics

SAG Calculator View All Technical Tools Radius of Curvature (mm): Diameter (mm): Sag (mm): $$ \text{SAG} = R \sqrt{R^2 \left( \frac{D}{2} \right)^2} $$ R : Radius of Curvature: D : Diameter: Description Determine the sag of a surface based on radius of curvature and diameter Related Product Category: Optical Lenses View All Now Was this content useful to you? Thank you for rating

## Alex G Doll Consulting Ltd

Metallurgical engineering calculations; Globally recognized specialist in mineral grinding ; Online powerbased grinding circuit design and benchmarking software wwwsagmilling example; Circuit benchmarking and debottlenecking audits for operating mines example; Short courses For operators, courses on operating SAG & ball mill circuits example; For plant design, courses on powerbased

## Alex Doll Principal Consultant Alex G Doll Consulting

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 The purpose of the comparison is to identify the

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