# sag and ag mill power calculation

### High Pressure Grinding Rolls (HPGR) Mining SGS

The total power for the HPGR system can be compared to that of a conventional circuit based on the rod and ball mill work indices and the Third Theory of comminution. The power comparison can also be done against AG/SAG mills. This methodology has only been used to scope the potential energy savings of HPGR at small scales.

### Autogenous and Semi-Autogenous MillsScienceDirect

9.4. AG/SAG Mill Power. In designing crushing–grinding flow sheets correct estimations of mill power draw are important as it serves as one of the deciding factors for selecting an option between AG/SAG mills. In most cases the circuit with the least or optimal power consumption is the preferred choice.

### SAG Calculator Edmund Optics

SAG Calculator. View All Technical Tools. Determine sag of a surface based on radius of curvature and diameter. Calculator can be used to provide simple mechanical parameters that simplify specification of optical components. Commonly used for lenses and mirrors.

### SINGLE STAGE SAG/AG MILLING DESIGN

SAG mill (4 ball charge 90 Nc) A cross between AG and SAG for average competency abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground) Kloof Jacobina 6 SAG mill with recycle crusher (815 ball charge) Competent ores better suited to coarse grind sizes. High aspect mills are recommended to

### Mill (grinding)Wikipedia

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 designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their

### SAGMILLING . . Mill Critical Speed Determination

Enter the width of a mill shell liner. Note this is not the width of a lifter You may use the Mill Liner Effective Width calculation to determine this value. 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.

### Application of Operating Work Indices in Autogenous

can be a major factor in AG/SAG mill product size distribution Figure 2 compares only data for porphyry ores. Before the true power efficiency of an AG/SAG grinding mill can be properly assessed by using the Wio concept the T 80 used for calculations must be corrected to reflect the additional fines in the AG/SAG circuit product size

### 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

### OUTOTEC GRINDING TECHNOLOGIES

single-stage SAG mills to the largest mill in the worldwith 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

### Mill (grinding)Wikipedia

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 designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their

### Orway Mineral Consultants Canada Ltd. Mississauga ON

Simulation software and power-based equation methodologies have been established for designing AG/SAG based grinding circuits and predicting their energy requirements. Presently power-based equations remain the principal method for designers to size mills and estimate the power requirement for comminution circuits.

### PublicationsSMC Testing

Influence Of Feed Size On AG/SAG Mill Performance Mapping Orebody Hardness Variability For Ag-SAG Crushing And HPGR Circuits Modelling And Simulation Techniques Applied For Optimisation Of Mine To Mill Operations And Case Studies Modelling The Influence On Power Draw Of The Slurry Phase In Autogenous (AG) Semi-Autogenous (SAG) And Ball Mills

### Ball Millsan overview ScienceDirect Topics

It is possible to make an approximate calculation of the capacity of a ball mill by means of the equation N = they receive their feed from rod mills AG mills or SAG mills. Figure 8.11. Ball mill external appearance and internal view. Ball mills are rated by power rather than capacity. Today the largest ball mill in operation is 8.53

### Mill (grinding)Wikipedia

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 designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their

### MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL

21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ball-mill power drawP as a function of its dimensions internal mill diameter D and length L zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm) the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h) zthe ball-mill dimensions (D and L) when

### Sag in Overhead Conductor Electrical4U

Apr 17 2018 · So having calculated the value of x 1 and x 2 we can easily find out the value of sag S 1 and sag S 2. The above formula are used to calculate sag when the conductor is in still air and ambient temperature is normal. Hence the weight of the conductor is its own weight. What is the Effect of Ice and Wind on Sag

### What s the difference of Ball mill SAG mill AG mill

Attrition mill is a type of grinding mill by kinds of media to crush lump to powder-like substances. The impact can be rock on rock such as in an Autogenous Grinding (AG) mill rock and a small ball charge ( 10 ) used in Semi Autogenous Grinding (SAG) mills balls of various sizes in Ball Mills and less commonly these days steel rods in Rod Mills.

### Grinding millsfor mining and minerals processingMetso

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.

### Grinding millsfor mining and minerals processingMetso

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.

### Power-based comminution calculations using Ausgrind

power requirements for circuits including SAG and ball mills. The method required a proposed F 80 feed size to the SAG mill the final grind size and an estimate of the transfer size between the

### Critical Speed Of Sag Mill Pdfcentroteologico

Critical Speed Of Sag Mill Pdf Ball Mill Critical Speed Mineral Processing 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.

### 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

### PublicationsSMC Testing

Influence Of Feed Size On AG/SAG Mill Performance Mapping Orebody Hardness Variability For Ag-SAG Crushing And HPGR Circuits Modelling And Simulation Techniques Applied For Optimisation Of Mine To Mill Operations And Case Studies Modelling The Influence On Power Draw Of The Slurry Phase In Autogenous (AG) Semi-Autogenous (SAG) And Ball Mills

### AGAutogenous SAG Semi-Autogenous Mill Design Calculations

Power drawn at the pinion is 448 kW 13.617 kWh/tonne (SAG mill) and 570 kW 17.325 kWh/tonne (ball mill) when processing 32.9 mtph for a total of 30.942 kWh/tonne or 14.6 above the conventional estimate. A ball charge volume which is lower than those tested has been selected in

### 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)

### 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

### Sag Mill Characteristicszibelloweb

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

### 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

### sag mill calculations

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

### Improved Relationships for Discharge in SAG/AG Mills

size distributions in AG/SAG mills. The existing models and understanding of grate discharge and classification are known to be flawed and have been identified as one of the key limitations in AG/SAG modelling. The aim of this thesis is to improve on the current understanding of discharge in the SAG/AG

### SINGLE STAGE SAG/AG MILLING DESIGNMetallurgy

SAG mill (4 ball charge 90 Nc) A cross between AG and SAG for average competency abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground) Kloof Jacobina 6 SAG mill with recycle crusher (815 ball charge) Competent ores better suited to coarse grind sizes. High aspect mills are recommended to

### Power-based comminution calculations using Ausgrind

power requirements for circuits including SAG and ball mills. The method required a proposed F 80 feed size to the SAG mill the final grind size and an estimate of the transfer size between the

### SINGLE STAGE SAG/AG MILLING DESIGN

SAG mill (4 ball charge 90 Nc) A cross between AG and SAG for average competency abrasive ores. Typically operated in RSA on Witwatersrand Gold Ore Driefontein (Underground) Kloof Jacobina 6 SAG mill with recycle crusher (815 ball charge) Competent ores better suited to coarse grind sizes. High aspect mills are recommended to