# how to calculate ball charge in sag mills

## how to calculate ball charge in sag mills

### Choosing a SAG Mill to Achieve Design Performance

by volume load Recent studies in the three-foot diameter SAG mill are instructive The following graph shows the relevant facts as Figure 2 Figure 2: Pilot Plant kg/hr Vs Charge % by Volume This data is indicative of trends that were happening in the 3-ft diameter SAG pilot mill They have not been proven in large commercial scale mills

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### Ball charges calculators - thecementgrindingoffice

- Ball top size (bond formula): calculation of the top size grinding media (balls or cylpebs):-Modification of the Ball Charge: This calculator analyses the granulometry of the material inside the mill and proposes a modification of the ball charge in order to improve the mill efficiency:

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### Mill Speed - Critical Speed - Paul O Abbe

Mill Speed No matter how large or small a mill, ball mill, ceramic lined mill, pebble mill, jar mill or laboratory jar rolling mill, its rotational speed is important to proper and efficient mill operation Too low a speed and little energy is imparted on the product

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### Ball Mill Critical Speed & Working Principle - YouTube

Jun 20, 2015· https://911metallurgist/blog/ball-mill Learn about Ball Mill Critical Speed and its effect on inner charge movements The effect of Ball Mill RPM s,

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### O I SKARIN N O TIKHONOV CALCULATION OF THE ,

to the detailed accounting of ball charge motion The Introduction gives a description of the proposed approxi-mation of ball charge position in a rotating drum and its depen-dence on the mill velocity In what follows, the mathematical ap-paratus used for the forecasting calculation of capacities of the drum shell and cone is presented

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### Grinding in Ball Mills: Modeling and Process Control

Keywords: Ball mills, grinding circuit, process control I Introduction Grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical, mechanical and chemical characteristics Typical examples are the various ores, minerals, limestone, etc

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### AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill ,

For overflow ball mills, the charge should not exceed 45% of the mill volume For grate discharge mills, the charge should occupy about 50% of the mill volume Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, ie,

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### Autogenous and Semi-Autogenous Mills - ScienceDirect

Jan 01, 2016· The SAG mill had a 6–8% ball charge and the power consumption was 8 kWh/t, which agreed well with the expected value 96 Problems 91 In an SAG mill the dimensions of the mill were 975 m × 35 m and the specific gravities of the mineral and ,

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### calculating the percent of sag ball charge

The charge volume of a ball or rod mill is expressed as the percentage of the volume within the liners filled , how to calculate sag mill ball charge , is very difﬁ cult to accurately predict or calculate , A SAG mill ball charge level of 14 percent was targeted Chapter 7

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### How can one select ball size in ball milling and how much ,

More balls with small size results in fine powder As a thumb rule powder to be milled should be taken as 25% of total ball weight If the quantity of charge is very less then milling balls will ,

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### SAG mill ball charge determination and its influence on ,

Abstract: In semi-autogenous grinding (SAG), the grinding mill inventory, (ie volume of total charge, volume of ball charge, etc) is important in determining the optimum operating condition for maximum production (tph), minimum specific energy (kwh/t) or lowest cost (\$/t) A two-dimensional graphical method is presented for determining the actual ball charge within the total charge when ,

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### SAG Calculator | Edmund Optics

We have set your country/region to United Stat You can change this selection at any time, but products in your cart, saved lists, or quote may be removed if they ,

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### A Method to Determine the Ball Filling, in Miduk Copper ,

one SAG mill (975 dia(m)*388 length(m)) following two parallel ball mills (5dia(m)*7lenght(m)) The aim of this research work was to investigate on the ball filling estimation of Miduk semi-autogenous (SAG) Mill via an utilized method Miduk SAG Mill circuit is shown in Figure 1 Figure 1: Diagram of Miduk Copper Complex SAG Mill Methods

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### ball and sag mills plants - piadinabarnl

difference between sag and ball mill | zenithoreplant , the free encyclopedia SAG mills use a ball charge of 8 to 21% , This entry was posted in Sem categoria and tagged difference between sag and ball mill by oreplant Get Price Here !

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### USING THE SMC TEST® TO PREDICT COMMINUTION CIRCUIT ,

Tumbling mills, eg AG, SAG, rod and ball mills Conventional reciprocating crushers, eg jaw, gyratory and cone HPGRs Tumbling mills are described using 2 indices: M ia and M ib Crushers have one index: M ic HPGRs have one index: M ih For tumbling mills the 2 indices relate to “coarse” and “fine” ore properties plus an

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### Mill Charge - an overview | ScienceDirect Topics

SAG mills of comparable size but containing say 10% ball charge (in addition to the rocks), normally, operate between 70 and 75% of the critical speed Dry Aerofall mills are run at about 85% of the critical speed The breakage of particles depends on the speed of rotation

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### sag mill ball charge calculation

AG Autogenous & SAG Semi-Autogenous Mill Design Calculations A ball charge volume which is lower than those tested has been selected in order to minimize wear Obviously, the SAG mill is consuming more and the ball mill less power than was predicted by the empirical method, but the overall total is 995% of the predicted total

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### calculates the grinding charge of a ball mill | Mining ,

how to calculate sag mill ball charge – Mining how to calculate motor kw of ball mill ? Grinding Mill China Tubular Ball Mills ? Free download as PDF File (pdf), text file (txt) or read online for free Jyoti Ceramic Industries Pvt Ltd

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### Application of Operating Work Indices in Autogenous ,

AG/SAG mill product that needs additional grinding in the ball mill, or “Corrected Ball Mill Feed” T2’ is the 80% passing dimension of the Corrected Ball Mill Feed Figure 1 Comparison of the Particle Size Distribution Slopes Figure 2 Relationship Between the Transfer Size Distribution Slope and T 80 or AWi0/BWi Figure 3

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### Ball Mill Design/Power Calculation - LinkedIn

Dec 12, 2016· 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 index of 15 and a size ,

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### how to calculate ball charge in sag mills - Grinding Mill ,

Ball mills are used primary for single stage fine grinding, regrinding, and as the second stage in two stage grinding circuits According to the need of customers, ball mill can be either wet or dry designs Ball mills have been designed in standard sizes of the final products between 0074 mm and 04 mm in diameter Application

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### Ball Mill Critical Speed & Working Principle - YouTube

https://911metallurgist/blog/ball-mill Learn about Ball Mill Critical Speed and its effect on inner charge movements The effect of Ball Mill RPM s,

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### SAGMILLINGCOM : tools_millfilling

Enter the number of lifters that are exposed above the mill charge Fractions are acceptable and should be used in the case where the charge does not sit uniformly in the mill For example, you may have 29 rows exposed at the discharge end of the mill, and only 28 exposed at the feed end

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### How To Calculate Residence Time In A Ball Mill

calculate ball mill residence time – The Q&A wiki Primary Rod Mill followed by Secondary Ball Mill calculate ball mill residence time – The Q&A wiki the hydraulic residence time t is given by t=V/q where V is the volume950 – 1350 ,small diameter ball mills 4 *Motor power at 35% ball charge , hensive calculation know-how

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### TECHNICAL NOTES 8 GRINDING R P King

steel balls in a ball mill, or large lumps of ore in an autogenous mill or a mixture in a semi-autogenous mill, as well as the slurry that makes up the operating charge Let Jt be the fraction of the mill volume that is occupied by the total charge, Jb the fraction of the mill volume that is occupied by steel balls and E the voidage of the balls

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### [PDF] Discrete Element Method simulation of charge motion ,

Discrete Element Method simulation of charge motion in ball, SAG and autogenous mills has become a standard for lifter design, power draft evaluation, etc Both two-dimensional and three-dimensional codes are being used The two-dimensional code dominates the user market since the code completes a simulation in one or two hours On the other hand, three-dimensional codes have been in the ,

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

The mill product can either be finished size ready for processing, or an intermediate size ready for final grinding in a rod mill, ball mill or pebble mill AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill

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### Bond formula for the grinding balls size calculation

Oct 19, 2017· — Past experience of a ball mill It is possible to calculate the grinding media average diameter formed in the mill operation, during grinding media unload from mill (the grinding balls bulk weight in fully unloaded mill) — Other enterpris It is possible to obtain the necessary data on a grinding media granulometric composition from ,

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### Increasing Productivity Without Capital Expenditure

The SAG mill charge estimator combines the SAG mill mass balance, Morrel‟s C model for power draw, and a nonlinear liner wear function as to calculate the power and weight, the total charge/volume, the ball/charge, and the shoulder/toe angles for the mill The SAG mass balance is based upon Epstein‟s

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