### 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.

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Rely on our proven track record of SAG and AG Mill superiority Since the early 1980s we have been designing and manufacturing Semi Autogenous SAG and Autogenous AG Grinding Mills under the Fuller Traylor brand Semi autogenous grinding uses a minimal ball charge in the range of 6 15 while autogenous grinding uses ore only.

Get Price### Advanced Controller for Grinding Mills Results from a

ore per day in six overflow ball mills The concentrate is transported to a smelter a few miles away The crushed ore from primary and secondary ores is conveyed into bins The ore from the bins is fed into the ball mill using a conveyor belt The ball mill grinding circuit is illustrated in Figure 2 Solids 78.9 Circulating Load 474 Advance

Get Price### Ball Millan overview ScienceDirect Topics

The ball mill accepts the SAG or AG mill product Ball mills give a controlled final grind and produce flotation feed of a uniform size Ball mills tumble iron or steel balls with the ore The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds The feed to ball mills dry basis is typically 75 vol

Get Price### SAG millsMetso Outotec

SAG milling extends itself to many applications due to the range of mill sizes available They 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 done by a ball mill SAG mills are also an optimum solution for wet grinding since crushing and screening in these

Get Price### How grinding mill design changed over the last 30 years

The design of such grinding mills is extremely critical requiring sophisticated software tools proprietary calculation worksheets and experienced technical engineers and drafters This blog will review how the mill design process has changed over the last 30 years While most of the changes have been positive new issues and problems have risen in the process.

Get Price### THE APPROPRIATENESS OF THE TRANSFER SIZE IN AG

will become the predictions In the case of SAB/SABC circuits the transfer size is the product of the SAG mill circuit and the feed of the ball mill circuit Hence if power based equations such as eq 1 and eq 2 are to be used to predict the SAG mill circuit and ball mill circuit specific energies it

Get Price### Electromechanical Dynamic Behaviour and Start Up

This paper presents a dynamic simulator of the electromechanical coupling start up of a ball mill The electromechanical coupling model based on the dynamic model of the ball mill the characteristic equation of the clutch and the dynamic model of the induction motor is established Comparison between the simulation results of angular speed load torque and current obtained from the model

Get Price### Autogenous and Semi Autogenous MillsScienceDirect

The SAG mill had a 6–8 ball charge and the power consumption was 8 kWh/t which agreed well with the expected value 9.6 Problems 9.1 In an SAG mill the dimensions of the mill were 9.75 m 3.5 m and the specific gravities of the mineral and that of the balls

Get Price### Fluid mechanics of slurry flow through the grinding media

Depending on the mill size the SAG mills draws between 2 MW and 17 MW The product from the SAG mill is further reduced in size using pebble crushers and ball mills Hence typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size.

Get Price### RoM BALL MILLSA COMPARISON WITH AG/SAG

II 314 RoM Ball millsa comparison with AG/SAG Milling Aubrey N Mainza1 and Malcolm S Powell 1 1Mineral Processing Research Unit University of Cape Town Rondebosch 7700 South Africa

Get Price### Mill drives the desire for increased power and the

The standard method for sizing secondary ball mills usually the overflow type in AG/SAG circuits follows published mill supplier information with aspect ratios in the range 1 1.5 to 1 2.0 depending upon product sizing and pulp flow i.e the highest expected circulating loads Morrell 2001 The applied net power calculated from testwork

Get Price### Expande Lining wear monitoring in SAG and Ball mills

Current Problem Challenge Wear monitoring of the internal liners of the SAG mill and ball mills is carried out with different methods and instruments taking advantage of scheduled or unscheduled operational stoppages and is performed by personnel who must enter the equipment ConsequencesRisk of accidents to people entering the mills.

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A ball mill is an effective means of dispersing solid materials in solids or liquids 8 9 Ball mills have several advantages which include versatility low cost of labor and maintenance the possibility of unsupervised running no loss of volatiles and a clean process The disadvantages are related to discharging viscous and thixotropic

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

The biggest characteristic of the sag mill is that the crushing ratio is large The particle size of the materials to be ground is 300 400mm sometimes even larger and the minimum particle size of the materials to be discharged can reach 0.1 mm The calculation shows that the crushing ratio can reach 3000 4000 while the ball mill s

Get Price### PDF Influence of feed size on AG SAG mill performance

This paper differentiates scrubber and AG mill modelling in a similar way that overflow ball mills and grate discharge ball mills are analysed Smaller scrubbers 600 kW are suited to small scale

Get Price### SAG Mill Grinding Circuit Design911metallurgist

SAG Mill vs Ball Mill As the diameter and length of mills increased several critical problem areas were identified One of the most important was the severe stressing which took place at the connection of the mill shell and the trunnion bearing end plates which is further aggravated by the considerable distortion of the shell and the

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

Principle of SAG Mill operation SAG is an acronym for semi autogenous grinding SAG mills are autogenous mills that also use grinding balls like a ball mill A SAG mill is usually a primary or first stage grinder SAG mills use a ball charge of 8 to 21 6 7 The largest SAG mill is 42′ 12.8m in diameter powered by a 28 MW 38 000 HP

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

mills with the rod mill and ball mill laboratory work indices Note in Figure 1 that the rod mill product slope is less than 0.5 due to an extra amount of nes present being ﬁ ﬁ ner than 650 μm These ﬁ nes proceed to the ball mill improving the ball mill efﬁ ciency Also the plotted rod mill P80 value as shown in Figure 1 is 2900

Get Price### 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.

Get Price### Shell vs Trunnion Mounted Millseand

Strain gauging of shell mounted mills has been undertaken in the past Some results have been published in SAG mill conferences Strain gauges were also used to check the design of the CMDIC shell mounted ball mills The statement in 1 that shell mounted mills have not been thoroughly tested is incorrect CONCLUSION

Get Price### Autogenous mills semi autogenous mills and ball mills

supported grinding mills up to the largest sizes SAG/ball mill circuit incorporating pebble crushers and a POLYCOM high pressure grinding roll SAG and ball mill for gold ore grinding One of three SAG mills with 9.75 m diameter and 2 x 4000 kW drive power These mills operate in conjunction with ball mills for iron ore grinding in Iran.

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operation of SAG mills SAG mills are currently the technology of choice in hard rock milling operations for reducing primary crushed ore to ball mill feed In recent years the trend has been towards larger sized SAG mills with diameters of 10.4 m 34 ft and above with the largest being 12.2 m 40 ft in

Get Price### Difference Between Sag Mill vs Ball Millmech4study

1 SAG mill is the primary tool for grinding SAG mill is used before the other mills Ball mill is a secondary and it is used after the SAG mill 2 SAG mill breaks the raw material into pieces for the further grinding Ball mill is used to grind the pieces of raw material into powder like structures 3.

Get Price### AG Mill and SAG Millball mills supplier

AG Mill and SAG Mill Feeding size ≤25mm Capacity 0.65 615t/h Output size 0.074 0.89mm Applications It is commonly used in the mineral processing industry and ferrous and non ferrous metal ore and nonmetal ore processing plants It can also be used in cement plant refractory plant fertilizer plant and smelting plant.

Get Price### Simulation of Material Transport in a SAG Mill with

A Discrete Elements Method DEM study of load movement within a SAG mill 12 192 7620 40′ 25′ in normal operating conditions is performed The purpose is to determine how the geometry of the lifters affects the kinetics of the load inside the mill Specifically the changes produced by the incorporation of inclined lifters and spiral or helicoidal pulp lifters to the kinetics are

Get Price### Grinding Circuit OverloadGrinding Classification

Your problem can occur in a SAG Mill or Ball Mill Other point to consider is the particle size distribution it is possible to receive a finer ore from the mine and the particle size distribution of the product from the crushing circuit is different In this case the residence time in the tumbling mill

Get Price### 17 Signs of Problems with Ball Mills Quickly Remove

What should we do to solve those problems 1 First of all it is necessary to do analyses including changes of nature of the ore whether the amount of ore water sand and overflow size are normal Then do the measures to deal with them 2 Reduce the amount of feed to the mill until the working state of the ball mill returns to normal 3 Appropriately reduce the amount of volume of rinse

Get Price### Steel Grinding Balls Failures in Drop Ball Test DBT

If the balls target environment is e.g SAG mill or large diameter balls mills there are no two ways about it you have to re temper them to improve impact toughness which is much needed in the

Get Price### A Method to Determine the Ball Filling in Miduk Copper

autogenous SAG Mill via an utilized method Miduk copper concentrator is located in Kerman Province Iran and its size reduction stage includes one gyratory crusher which feeds one SAG mill 9.75 dia m 3.88 length m following two parallel ball mills 5dia m 7lenght m After SAG mill a

Get Price### PDF LARGE DIAMETER SAG MILLS NEED LARGE

In some plants the performance of large diameter ball mills is not as efficient in energy consumption as predicted from the performance of laboratory and pilot plant ball mills Ball mill scale up

Get Price### PDF OPTIMIZATION OF THE SAG MILL CIRCUIT AT

circuit The Kinross Paracatu new grinding circ uit consists of one 11.6 x 6.7m 38 x 22 SAG mill with installed po wer of 20MW followed by two 7.3 x 12.2m 24 x 40 ball mills with

Get Price### Ball Mills and Sag Mill problem AMP Maintenance Forums

I work in an industrial copper company as vibration analysis supervisor This company started to work about 2 years ago We have two Ball Mills and one Sag Mill We had some visual inspection on pinion and ring gears during these inspections we found some abnormal wear on this gears pictures show this problem in enclosure .

Get Price### TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS

SAG mills have a power higher than 10 MW Even ball mills have a power larger than 10 MW For this reason they have an important impact in energy consumption and in the operation of the power distribution system Figure 1 Picture of a typical GMD system for a SAG mill Figure 2 presents the power circuit of a cycloconverter fed synchronous motor.

Get Price### Ball Mills Losing High Low Lube pressureGrinding

One of our Ball Mills keeps losing pressure on the high pressure pump It will run fine when starting the Mill and suddenly after a while sometimes 1hrs the pumps will loose pressure We have just grinded the journal and installed new white metal bearings After startup this afternoon after about 1hrs the pumps low and high just lost pressure.

Get Price### An Expert System for Control of a Sag/Ball Mill Circuit

e AG/SAG Mill TheoryText and graphics explaining grinding definitions the fundamentals of AG and SAG mills mill control strategies techniques for handling problems with overviscous pulps and effects of variation of mill speed ball load and total mill charge on throughput and output quality.

Get Price### Codelco Andina changes the main motors of its ball mills

Due to the great technical knowledge and safety protocols of Outotec in this type of work Codelco Andina invited the company to participate in the change out of two of its 7500 and 8500 HP SAG grinding ball mill motors in the interior of its underground operation.

Get Price### Ball mill/SAG mill drive lubrication system IEEE

Abstract This paper describes the function and operation of lubrication systems for Ball Mill and SAG Mill Drives Provided within this paper are hydraulic schematics functional description and a general overview of system layout as well as some of the important features and factors relevant to improving the reliability of this very critical part of the grinding mill drive system.

Get Price### OSTI.GOV Technical Report Improving Energy Efficiency

Depending on the mill size the SAG mills draws between 2 MW and 17 MW The product from the SAG mill is further reduced in size using pebble crushers and ball mills Hence typical gold or copper ore requires between 2.0 and 7.5 kWh per ton of energy to reduce the particle size Considering a typical mining operation processes 10 000 to 100 000

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