# power based sag mill design calculations

OMC Power-Based Comminution Calculations for Design, Modelling .which is used in turn to size a mill for dimensions, internal geometry and loading conditions to match the power draw. The most frequently used power-based methodologies for calculating energy requirements for comminution circuits using AG/SAG mills are concisely presented in the following section. This paper describes.power based sag mill design calculations,Mill Throughput CapacityThe SAG mill product is then crushed to passing 3.35 mm and is subjected to the Bond ball mill work index (Sd-BWI) grindability test to provide the total pinion energy at the specified grind size for mill design purposes, herein reffered to as micro ore hardness. The full SAGDesign test produces the SAG grindability.

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power based sag mill design calculations,calculation of the required semiautogenous mill power based on the .milling. The method is widely used by RIVS in extended calcula- tions at early design stages. The article is composed of sections successively informing on the existing techniques of sizing SAG mill power, Bond work in- dexes and their applicability to calculating autogenous/semiau- togenous mills. Finally, the authors give.power based sag mill design calculations,Modelling SAG milling power and specific energy consumption .Oct 7, 2014 . ondary ball milling. 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 con.

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

Oct 7, 2014 . ondary ball milling. 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 con.

### gross power calculator - SMC Testing

This model uses the equations from Morrell's 1993 PhD thesis: “The Prediction of Power Draw in Wet. Tumbling . As indicated by this data base the accuracy .. AG/SAG Mill min max min max. DESIGN DATA diameter inside shell (m). 0.9. 7.9. 1.8. 12.2 belly length inside liners (m). 1.5. 12.2. 0.5. 9.6 liner thickness (mm). 51.

power based sag mill design calculations,

### Ball Mill Design/Power Calculation - 911 Metallurgist

Mar 17, 2017 . 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 . The values of P and F must be based on materials having a natural particle size distribution.

### OMC Power-Based Comminution Calculations for Design, Modelling .

which is used in turn to size a mill for dimensions, internal geometry and loading conditions to match the power draw. The most frequently used power-based methodologies for calculating energy requirements for comminution circuits using AG/SAG mills are concisely presented in the following section. This paper describes.

### calculation of the required semiautogenous mill power based on the .

milling. The method is widely used by RIVS in extended calcula- tions at early design stages. The article is composed of sections successively informing on the existing techniques of sizing SAG mill power, Bond work in- dexes and their applicability to calculating autogenous/semiau- togenous mills. Finally, the authors give.

### technical memorandum - SAGMILLING.COM

Nov 11, 2015 . grinding circuit. There are three power-based methodologies for sizing SAG mills that are widely used: . Each methodology involves a series of grindability laboratory tests and a suite of equations used for mill power . mostly suitable for optimization of an existing mill, but not for preliminary design work.

### gross power calculator - SMC Testing

This model uses the equations from Morrell's 1993 PhD thesis: “The Prediction of Power Draw in Wet. Tumbling . As indicated by this data base the accuracy .. AG/SAG Mill min max min max. DESIGN DATA diameter inside shell (m). 0.9. 7.9. 1.8. 12.2 belly length inside liners (m). 1.5. 12.2. 0.5. 9.6 liner thickness (mm). 51.

### Methods to Estimate AG/SAG Mill Grinding Power Requirements

Mar 19, 2017 . Various grinding experts discuss a few methods and techniques used to determine SAG and AG mill power requirements of circuits based on ore . Gives you both SAG hardness and Bond Ball Mill Work Index (on SAG ground ore, not from crushed cores) – all you need to design circuit & size mills.

### Ball Mill Design/Power Calculation - 911 Metallurgist

Mar 17, 2017 . 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 . The values of P and F must be based on materials having a natural particle size distribution.

### Calculating Power Draw when sizing Ball Mills - Grinding .

Apr 4, 2017 . If you size a ball mill based on ; you use the hardness to derive the needed power to reduce to a target size at a particular throughput. From that "power draw" you calculate a shell size from 4 parameters: diameter, effective length, wet or dry? %loaded and % of critical speed. You also size an.

### Mill drives - Future of Manufacturing - Siemens

Once the power level for the primary (SAG) mill has been set, i.e., design tonnes per hour (tph) x design E total . the effective grinding length (EGL) inside feed end liners and discharge grates, motor rated power output, . The applied net power, calculated from testwork and power-based modelling, as well as iterations of.

### A model of mill power as affected by mill speed - SAIMM

Jun 6, 1993 . Accurate models of mill power are becoming more necessary as the design, operational, and control require- ments for grinding mills become more . mill power to operating variables. Bond's formula is still widely used, in spite of its inadequacies (particu- larly at high mill speeds, variable mill loads and.

### Optimization of the Design of SAG Mill Internals Using High Fidelity .

Optimization of the Design of SAG Mill Internals. Using High Fidelity Simulation by . High fidelity physics-based modeling tools consisting of discrete element methods. (DEM), computational fluid . calculation of impact and shear forces, impact and shear energy spectra for dissipation into particle classes and maps of.

### SAG Mill Operation at Cortez: Evolution of Liner Design from Current .

The Cortez SAG mill liner design was recently modified to improve the mill operating energy efficiency. . observations to calculate charge motion, packing between lifters, and slurry transport through grate and pulp lifters. ... every 1.5 hour period per operating day based on analysis of current mill trends. • Increasing the.

### Optimization of mill performance by using online ball . - (SciELO) SA

height 'H' from the charge to the shell and the internal mill diameter 'Di'. By calculating the ratio 'H/Di' and using the graph below. (Figure 1), the charge filling . Mill power. Usually, plant operators use mill power readings as an indicator of ball filling degree and, often, try to keep it at the maximum level. It is well known that.

### ONLINE SAG MILL PULSE MEASUREMENT AND . - OSTI.GOV

At the same time, it can also be used to design balls and liner systems that can survive longer in the mill. The technological advances made in electronics and ... based on the power draft and in some operations with load cells readings. .. Rajamani et al calculated the impact spectra of large diameter SAG mills using a.

### Design, Construction and Performance Analysis of . - Global Journals

Design Methodology a) Milling Sizing. The Bond's method was used in sizing the laboratory ball mill. This method is based on two power calculation approaches used in ball and rod mill design processes due to its simplicity and workability. The first approach, which is specific power calculation, determines the power.

### Optimization of the single stage SAG mill circuit at the . -

SAG MILL. Availability (%). 92. Design throughput (t/h). 620. Circuit P80 (um). 75. Pebbles production rate (t/h). 186. Circulating Load excl. Pebbles (%). 275. Mill installed power (kW). 16,500. Critical speed - normal (%). 60 to 80. Ball charge (%) up to 15. The cyclone overflow is thickened prior to cyanide leaching in tanks.

### The effects of lifter configurations and mill speeds on the mill power .

Therefore, it is essential for milling management to continuously improve the design based on operating experiences . observed over grinding time using the load cell were averaged by using moving average method. The mill power draw is then calculated from the force readings using the following equation: (. ) 60.