# rod and ball mill charge

### Module2Rod And Ball Mill Power Draw 1430jwr0594j

ROD AND BALL MILL POWER DRAW TABLE OF CONTENTS Objectives Introduction Energy and power Mill power draw at the pinion Progress Review 1 i page 1 2 3 5 8 PART IMill Power Draw Calculations 14 Rod mill power draw Ball mill power draw Accuracy of power draw calculations 15 21 27 PART IIIncreasing the Power Draw of Grinding Mills 29

Get Price### What are the differences between ball mill and rod mill

Mar 08 2021 Recommendation of ball mill and rod mill Ball mill and rod mill are suitable for different materials 1 Selection by material s hardness Ball mill has a strong adaptation of material and it is suitable for grinding hard materials such as slag iron ore copper ore etc Rod mill is suitable for grinding brittle material such as rare metals.

Get Price### How to Handle the Charge Volume of a Ball Mill or Rod Mill

Jan 04 2012 Rod mills are very similar to ball mills except they use long rods for grinding media The rods grind the ore by tumbling within the the mill similar to the grinding balls in a ball mill.To prevent the conditions leading to rod charge tangling the length to diameter ratio is maintained at 1.4 to 1.6.Rod mills accept feed up to about 50 mm 2 in and produce a product in the size range of

Get Price### Rod Mill VS Ball Mill Comparative Analysis of

May 08 2020 Ball mill VS rod mill charge ratio of grinding media The charge ratio of grinding media refers to the percentage of grinding media in the volume of the mill For different material grinding methods mill structure operating conditions and mills with different media shapes the grinding medium charge

Get Price### Ball and Rod MillPK Mining

Rod mills are grinding machine which employ high carbon steel or special steel rods of nearly the same length as that of the drum in place of steel balls in ball mills Rod mill products are generally coarser than those produced in a ball mill and rod mills are well suited to handle coarser feed and to control the top size of the product.

Get Price### How to Handle the Charge Volume of a Ball Mill or Rod Mill

Mar 27 2020 The charge volume of a ball or rod mill is expressed as the percentage of the volume within the liners filled with balls or rods When the mill is stationary the charge volume can be quickly obtained by measuring the diameter inside the liners and the distance from the top of the mill inside the liners to the top of the charge The percentage

Get Price### calculating steel ball charge in ball mill

Rod mills are very similar to ball mills except they use long rods for grinding media To prevent the conditions leading to rod charge tangling the length to For an equivalent grind a rod mill uses less steel than a ball mill because of the

Get Price### Development application and operating results of the

A rod mill may be defined as a rotating cylindrical shell lined with wear resistantrenewable liners and carrying a charge of rods that reduce the mill feed by abrasion and impact as the rods cascade within the shell A rod mill differs from a ball mill in that the comparatively rigid grinding

Get Price### Rod Mill ChargingYouTube

Jun 19 2015 Here a Rod Mill has its daily 3.5 steel rods being added using a mechanised rod mill charger The operator only has a few minutes to load the rods and rest

Get Price### Bond Index Ball Mill Rod Mill BT 100 XLRETSCH

The Bond Index conforming rod charge consists of 6 rods of 1.25 diameter and 21 length 2 rods of 1.75 diameter and 21 length The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave shaped design At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

Get Price### TECHNICAL NOTES 8 GRINDING R P King

The geometry of a mill with conical ends is shown in Figure 8.6 The total volume inside the mill is given by Vm 4 D2 mL 1 2 Lc L L 1 Dt/Dm 3 1 Dt/Dm 8.16 The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill

Get Price### What are the 7 differences between a ball mill and a rod

Mar 04 2021 4 Medium charge ratio of ball mill and rod mill Medium charge ratio is the percentage of grinding medium in the volume of the grinder For different grinding methods there is a suitable range in grinder structure operating condition medium shape and medium charge ratio Too high or too low medium charge ratio will affect the grinding

Get Price### Ball Mills vs Rod Mills

Jul 03 2017 Because of this the rod mill can effectively reduce 1″ feed size to 10 mesh or finer in open circuit The voids or interstitial space within a rod load are approximately half those in a ball mill grinding load Rods in place weigh approximately 400 pounds per cu ft and balls in place approximately 300 pounds per cu ft..

Get Price### Ball Mill Charge Calculationcaesarmachinery

how to calculate charge in ball mill Description Calculations for mill motor power mill speed and media charge L = Internal length of the mill in cms after lining how to calculate sag mill ball charge BINQ Mining Jan 01 2013 TechnoMine Services LLC mill charge and speed.

Get Price### 7 Differences Between Ball Mill and Rod MillXinhai

Nov 29 2018 4 Medium charge ratio of ball mill and rod mill Medium charge ratio is the percentage of grinding medium in the volume of the grinder For different grinding methods there is a suitable range in grinder structure operating condition medium shape and medium charge ratio Too high or too low medium charge ratio will affect the grinding

Get Price### What s the Difference Between Ball Mill Rod Mill and SAG

Mar 20 2020 Ball mill When the particle size of the product is less than 0.5mm the grinding effect of the ball mill is greater than that of a rod mill of the same specification SAG mill The SAG mill has a wide range of feeding particle sizes and can process larger minerals but at the same time its output particle size is relatively larger.

Get Price### O I SKARIN N O TIKHONOV CALCULATION OF THE

EURASIAN MINING 1 2015 Technology and technics of ore preparation processes 7 feed for the rod mill i.e 10000 μm in accordance with Table The value of P 80 is accepted based on the required grain size characteristics of the ball mill discharge.

Get Price### Grinding Mill Computer Model

16 000µ for the rod mill and 4 000µ for the ball Rg is a distance from the centre of gravity of the charge to the centre of the mill for a 1m diameter mill and n is the number of revs per minute of the millMorgardshammar/Marcy equation Mill diameter inside linersD

Get Price### Continuous Rod and Ball Mill Sepor Inc

Continuous Rod and Ball Mill Request Pricing Info Sepor s 16 x 32 continuous ball or rod mill is ideal for pilot plant studies of ore grinding and processing or just regular small scale grinding requirements you may have The mill can be used in a closed circuit with a spiral classifier screen or cyclones or as a single pass grinding

Get Price### Batch Ball or Rod Mill Container Sepor Inc

Either wet grinding or dry grinding may be conducted in the batch ball and rod mills The jars should be charged with at least 20 pounds of balls or rods for the rod mill and 25 to 40 by volume material to be ground 1.4 liters to 2 liters .

Get Price### MINE LINERSMagotteaux

Mill type SAG FAG Rod mill primary ball mill secondary ball mill regrind Ore feed size F80 F100 and required product size P80 determining the grinding mechanism to be favoured Mill size diameter length Maximum ball top up size Mill rotational speed rpm

Get Price### Rod Millan overview ScienceDirect Topics

In Mineral Processing Design and Operations Second Edition 2016 8.3.1 Rod Mill Charge Rod mill charges usually occupy about 45 of the internal volume of the mill A closely packed charge of single sized rods will have a porosity of 9.3 With a mixed charge of small and large diameter rods the porosity of a static load could be reduced even further.

Get Price### Mill grinding Wikipedia

Ball mill A typical type of fine grinder is the ball mill.A slightly inclined or horizontal rotating cylinder is partially filled with balls usually stone or metal which grind material to the necessary fineness by friction and impact with the tumbling balls Ball mills normally operate with an approximate ball charge of 30 .

Get Price### What is the difference between a SAG mill and ball mill

Rod mill A rotating drum causes friction and attrition between steel rods and ore particles citation needed But note that the term rod mill is also used as a synonym for a slitting mill which makes rods of iron or other metal Rod mills are less common than ball mills for grinding minerals.

Get Price### Rod mills how they functionMine Engineer

The rods grind the ore by tumbling within the the mill similar to the grinding balls in a ball mill To prevent the conditions leading to rod charge tangling the length to diameter ratio is maintained at 1.4 to 1.6 Rod mills accept feed up to about 50 mm 2 in and produce a product in the size range of 3000 to 270 mm –4 to –35 mesh .

Get Price### Rod/Ball Mill Eriez Lab Equipment

Ball/Rod mill Literature The Ball/Rod mills are meant for producing fine particle size reduction through attrition and compressive forces at the grain size level They are the most effective laboratory mills for batch wise rapid grinding of medium hard to very hard samples down to finest particle sizes.

Get Price### Ball Mill Critical Speed Working PrincipleYouTube

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

Get Price### Ball Mill Design/Power CalculationLinkedIn

Dec 12 2016 Rod and ball mill grindability test results should only be applied to their respective methods of grinding If P is less than 80 passing 70 microns power consumption will be Ball Mill Power

Get Price### Bond Work Index TestsGrinding Solutions Ltd

The Bond Ball Mill Work Index BBWi test is carried out in a standardised ball mill with a pre defined media and ore charge The Work Index calculated from the testing can be used in the design and analysis of ball mill circuits The test requires a minimum of 10kg of sample that has been stage crushed to 100 passing size of <3.35 mm.

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

Typically R = 8 Rod Mill Charge Typically 45 of internal volume 35 65 range Bed porosity typically 40 Height of bed measured in the same way as ball mills Bulk density of rods = 6.25 tons/m3 In wet grinding the solids concentration 1s typically 60 75 by mass A rod in situ and a cutaway of a rod mill

Get Price### qu est ce que ball mill charge circulante

Ball Mill Capacity vs Rod Mill CapacityUntil recently many operators have believed that one particular type of grinding mill had greater efficiency and resulting capacity than some otherBall vs Rod Mill ConversionThe correct grinding mill depends so much upon the particular ore being treated and the product desired that a mill must have maximum flexibilityBall Mill Trunnion and Mill Grate

Get Price### Small Scale Tests to Characterise Ore Grindibility

ball mill rod mill and MacPherson autogenous and pilot plant tests require relatively more weight for a given top size because they are run until a steady state is achieved which involves replacing the mill charge several times throughout the test The Bond tests are typically run for a minimum of seven cycles while the MacPherson and pilot

Get Price### Ball MillsMineral Processing Metallurgy

Feb 13 2017 This fact should be carefully kept in mind when determining the capacity of a Steel Head Ball Rod Mill as this unit can carry a greater ball or rod charge and has potentially higher capacity in a given size when the full ball or rod charge is carried A mill shorter in length may be used if the grinding problem indicates a definite power input.

Get Price### Volume Of Ball In Ball Millspsecemin.edu

How to Handle the Charge Volume of a Ball Mill or Rod Mill In physics the charge of a volume is commonly described by a quantity called the charge density or the charge distribution When the electric field that arises from the charge distribution exhibits a volumetric symmetry a handy relationship known as Gauss s Law may be used to calculate the charge distribution of the volume

Get Price### What s the Difference Between Ball Mill Rod Mill and SAG

Mar 20 2020 Ball mill When the particle size of the product is less than 0.5mm the grinding effect of the ball mill is greater than that of a rod mill of the same specification SAG mill The SAG mill has a wide range of feeding particle sizes and can process larger minerals but at the same time its output particle size is relatively larger.

Get Price### Grinding MillsHarcliff

Ball Charge Trajectory Modelling DEM Mechanical 3D Modelling For example a ball mill may be converted into a SAG mill or a rod mill into a ball mill Refurbishment is treated as a turnkey projectstarting with the removal of your mill and redesign work when required and moving on to manufacturing replacement equipment

Get Price### The Effect of the Grinding Charge Trajectory on the

and optimal grinding charge trajectory for the SAG Ball and Rod Mills Identified potential benefits could be obtained with an ideal grinding media charge mill speed as well as optimisation of lifter profile specialty lifter face 20 angle which is directly related with mill power draw internal motion of mill charge

Get Price### Difference Between Ag Sag Ball Mill Rod Mill

Rod And Ball Mill Charge Know the subtle but important differences between ball mills and rod mills when selecting used grinding equipment for your mining site projectobert mcivormetcom technologiesompleted numerous projects from rod ball agsag and roller mill selection on rod and ball mill power draw power and charge level measurements

Get Price### Ball Mill Designfreeshell

Ball Milling Theory Page 2 Optimized Jar Loading Figure 3 An overcharged mill drum Undercharging your mill in this manner will increase the milling times Figure 4 Undercharged media with overcharged load relative to a properly charged mill One key to efficient milling is a properly charged milling jar Charge refers to

Get Price### MARC Technologies Laboratory MillingRod Ball Mills

MARC manufactures a wide range of laboratory ball rod mills and automated Bond rod ball mills with wave liners to suit most metallurgical laboratory applications Our range extends from small 6L jar type mills that are manually positioned on rollers to large 30L size mills.

Get Price### ball mill media charge calculation pdf

Charge Dynamics in Tumbling Millspure.ltu.se In rod and ball mills the different charge media are usually made of steel and added to the mill In autogenous mills the ore itself is used as charge medium Get Price

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