### A comparison of SAG mill power models

the mill shell. The measured power is 3 190 kW at mill shell so the model predicts high by 298 kW or 9 . However by substituting the recommended 5 allowance for a cone end instead of Austin s cone allowance results in a 148 kW of power generated in the cone for a total of 3 113 kW power draw at the mill shell. The measured power is 3 190

Get Price### Proc IMechE Part C Experimental investigation of the

cient for predicting the power of the mills. Moys10 studied the eﬀect of mill speed load volume and liner design on mill power draw. Morrell11 in his PhD thesis derived the theoretical mill power model which can accurately predict the power draw of industrial grinding mills over a wide range of operating and design conditions.

Get Price### Calculation of energy required for grinding in a ball mill

The Bond work index W i as an indicator of the grindability of raw materials is not a material constant but rather it changes with change of size of the grinding product.Therefore in practice we can expect some difficulties and errors when the energy consumption is determined according to this formula in the case when for a given size of grinding product the value of the work

Get Price### AMIT 135 Lesson 6 Grinding CircuitMining Mill Operator

Scale Up in Sizing for Grinding Mills. Scale-up criterion is the net specific power consumption i.e. the power consumed by the mill rotor itself minus all mechanical and electrical losses divided by the feed rate of solids. For the full scale mill specific power is multiplied by the feed rate to get the net mill power.

Get Price### AMIT 135 Lesson 8 Rod MillsMining Mill Operator Training

The Rowland and Kjos equation indicates that power draw is a function of the fraction of the critical speed for the mill. Marcy mills are recommended to operate a peripheral speeds governed by the following relationship Peripheral Speed= 108.8 D 0.3 meters/ min. D = mill diameter in meters. The Marcy expression is applicable for mill

Get Price### Effect of lifters and mill speed on particle behaviour

Similar linear trends were found for power draw below about 80 critical in a SAG mill using DEM in 2D (Cleary 2001a) and also in a recent experimental and DEM study on a

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Aug 25 2018 · This week we design and build a super simple power drawbar for the mini mill. 3D model available on the website. Power DrawbarS02E38 Physics Anonymous Small Surface Grinder Part 10

Get Price### Calculate ball charge ball millHenan Mining Machinery

CALCULATION OF THE POWER DRAW OF DRY. of the Bond ball mill grindability test For all model based methods a reliable method to calculate mill power draw for a given mill is required for the calculation of power draw Morrell 1996 proposed a mathematical model for autogenous semiautogenous and ball mills which is based on the motion of grinding

Get Price### MODULE #5 FUNCTIONAL PERFOMANCE OF BALL MILLING

Figure 2 illustrates that the total mill power draw multiplied by the classification system efficiency is the effective mill power draw . The effective mill power draw is the power draw that is applied to the grinding of coarse particles. Figure 2. The "effective mill power draw". Now let s see how the remaining two terms ore grindability and

Get Price### Power Calculation Formula Of Ball Mill Ball Mill Power

Power Calculation Formula For Ball Mill. Power calculation formula for ball mill ball mill designpower 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

Get Price### Ball Mill Design/Power CalculationLinkedIn

Dec 12 2016 · 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 to be fed 100 TPH of a material with a work

Get Price### Bond formula for the grinding balls size calculation

Oct 19 2017 · We draw your attention a larger grinding balls need to use for future loads. As practice shows the difference between the grinding balls average diameter in mill and loaded grinding balls diameter is 10-15 mm. In our example the grinding balls diameter needed to load into the mill must be equal to 40-50 mm. Let s sum up.

Get Price### TECHNICAL NOTES 8 GRINDING R. P. KingMineral Tech

mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential

File Size 943KB Get Price### Grinding mills how to accurately predict their power draw

A theoretical approach to the modelling of the power draw of industrial tumbling mills is described that is based on the motion of the grinding charge.

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The performance of tumbling mills is sensitive to the volumetric mill filling which influences grinding media wear rates throughput power draw and product grind size from the circuit. Each of these performance parameters peaks at different filling values. In order to contin-uously optimize mill operation it is vital to

Get Price### Benchmarking SAG Mill Power Draw ModelsSAGMILLING

Benchmarking SAG Mill Power DrawYanacocha. Latchireddi S. Faria E. Achievement of High Energy Efficiency in Grinding Mills at Santa Rita Proceedings of the Canadian Mineral Processors Annual General Meeting Ottawa Canada January 2013.

Get Price### Grinding Mill Power Consumption Mineral Processing and

(1985). Grinding Mill Power Consumption. Mineral Processing and Extractive Metallurgy Review Vol. 1 No. 3-4 pp. 297-345.

Get Price### A Method of C alculating Autogenous/ Semi-Autogenous

D BURGESS 38 11TH MILL OPERATORS CONFERENCE 2012 / HOBART TAS 2931 OCTOBER 2012 an open circuit operation. This paper suggests the factors vary from 1.17 to over 2.5 depending on the transfer size. Morrison et al (2011) stated that the Ab value generated from the drop weight tester (DWT) is equal to only 40 per cent

Get Price### Modelling SAG milling power and specific energy

mill diameter mill length grates openings and pebble ports size the power equation is also function of all the operational variables selected for this study. The applied force is a function of the mass inside the mill and it is composed of balls ore and water. The ball charge is a function of the bulk fraction of the SAG mill volume (Jb)

Get Price### Energy Use of Fine Grinding in Mineral Processing

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 energy used for ﬁne grinding is still signiﬁcant. Moreover as this paper seeks to demon-

Get Price### Power DrawbarS02E38YouTube

Click to view9 10Aug 25 2018 · This week we design and build a super simple power drawbar for the mini mill. 3D model available on the website. Power DrawbarS02E38 Physics Anonymous Small Surface Grinder Part

Author Physics Anonymous Get Price### (PDF) Effect of Lifter Shapes on the Mill Power in a Ball Mill

To study the effect of lifter shapes on mill power a DEM model (∅ 520 40 mm) with 24 pieces of lifter was established. As shown in Figure 1 the lifter was designed with three different

Get Price### CALCULATION OF THE POWER DRAW OF DRY

given mill is required for the calculation of power draw. Morrell (1996) proposed a mathematical model for autogenous semi-autogenous and ball mills which is based on the motion of grinding charge inside the mill. He also verified his approach with various plant data (Napier-Munn et. al. 1996). In this study power draw of 14 multi

Get Price### Best way to determine the ball-to-powder ratio in ball

Best way to determine the ball-to-powder ratio in ball-milling The maximum power draw in ball mill is when ball bed is 35-40 by volume in whole empty mill volume. which formula

Get Price### Application of Operating Work Indices in Autogenous

in 1 . By rearranging the formula to 2 the operating work index (Wio) of an existing grinding circuit can be calculated given known mill power draw throughput feed and product size distributions. kWh/t = Power applied per ton of feed to the grinding unit Wi = The standard Bond work index of the ore P 80 = The 80 cumulative passing size

Get Price### Rod Mill Design Power Draw

The rod mill motor power is in horsepower at the mill pinion-shaft. For different length rod mills power varies directly as rod length. For difference between new and worn liners increase power draw by 6 and adjust for bulk density per Table A. Wet grinding rod mills are normally used in minerals processing plants.

Get Price### Ball Mill Motor Power Draw Sizing and Design Formula

The following equation is used to determine the power that wet grinding overflow ball mills should draw. For mills larger than 3.3 meters (10 feet) diameter inside liners the top size of the balls used affects the power drawn by the mill. This is called the ball size factor S. Rod and Ball Mills by C.A. Rowland and D.M. Kjos Allis-Chalmers

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Orway Mineral Consultants Canada Ltd. Mississauga ON. L4W 5N5 Canada orway ABSTRACT Orway Mineral Consultants Ltd (OMC)as a consultancy has speciali zed in comminution circuit design for over 30 years. OMC Power Model is OMC sThe in-house software for specific grinding energy power-based circuit calculations.

File Size 1MB Get Price### (PDF) Prediction of grinding-mill powerResearchGate

Analysis of the historic mill power draw site data on ball filling provided by mill grind-outs and applying the Morrell Power model (Morrell 1993) to back-calculate approximate mill filling

Get Price### (PDF) Effect of Lifter Shapes on the Mill Power in a Ball Mill

To study the effect of lifter shapes on mill power a DEM model (∅ 520 40 mm) with 24 pieces of lifter was established. As shown in Figure 1 the lifter was designed with three different

Get Price### AN UPDATED DATA SET FOR SAG MILL POWER MODEL

Sizing the mills for a new grinding circuit requires a determination of how much energy is required for grinding (using test results such as Bond work indices) and then finding the mill sizes to draw that required amount of energy. There are several mill power draw models available to perform the second

Get Price### Experimental investigation of the power draw of tumbling

A power analyser was utilized to measure mill power. Increase in mill speed and ball filling leads to a remarkable increase in the amount of the power. Preliminary results show that there is a definite trend between the power and the slurry filling U. Mill power draw is maximum at slurry concentration 60–70 and slurry filling 0.84.

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