### How to Make a Ball Mill 12 Steps with Pictures wikiHow

Ball mills are a special instrument used to break up hard solids into a fine powder They are similar to rock tumblers in that the instrument is a rotating container filled with heavy balls to grind the substance into powder Ceramic material crystalline compounds and even some metals can be ground up using a ball mill.

Get Price### SAGMolycop

The Molycop range of SAG grinding balls is prepared for impact Through an innovative manufacturing process we ve produced a ball with greater impact resistance and reduced spalling compared to the standard SAG ball ready to perform in the highest impact SAG milling environments.

Get Price### Gearless mill drivesABB

22 MW GMD for 28 ball mill 28 MW GMD for a 40 SAG mill 28 MW GMD for 42 SAG mill Whether it is size or an installation at the highest altitude 4600 m.a.s.l ABB s GMDs are well positioned to contribute to the building of larger and ever more powerful mills Leading the gearless mill

Get Price### PDF Grinding in Ball Mills Modeling and Process Control

process control in industrial ball mills remains an open problem motivating future research activities and comprehensive studies 2 19 26 27 48 We shall conclude this section by mentioning

Get Price### Optimization of mill performance by using

Optimization of mill performance by using online ball and pulp measurements by B Clermont and B de Haas Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator Comminution is responsible for 50 of the total mineral processing cost In today s global markets expanding mining groups are trying

Get Price### SOBO iQ Soft Braking Controlsaltramotion

Ball Sag Mills Clutches Brakes and a revolutionary dual loop PI control pressure/speed The pressure control is based not only on speed but also on deceleration SOBO iQ controls braking torque by comparing a preset speed ramp with actual conveyor speed feedback The unit can provide different braking profiles for different

Get Price### OPTIMAL SAG MILL CONTROL USING VIBRATION

OPTIMAL SAG MILL CONTROL USING VIBRATION DIGITAL SIGNAL PROCESSING TECHNIQUES ABSTRACT Recent developments in low power wireless and Digital Signal Processing DSP technologies have given rise to a new system that can monitor vibrations in real time on the rotating surface of SAG AG and Ball mills.

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.

Get Price### AG/SAG Mill Circuit Grinding Energy RequirementHow

AG/SAG and ball mill circuit data is also very poor Use of equation 2 shows a very different picture the results being illustrated in Figure 7 This shows that on average the M operating work indices of AG/SAG and ball mill circuits are very similar and hence energy utilisation efficiencies are similar Also the AG/SAG and ball mill

Get Price### sag and ball mill controlslatabledesalignac.fr

Process control challenges and opportunities in mineral 14/08/2015 Grinding is often finished with a ball mill which differs from a SAG mill as it relies on the steel alone for grinding A SAG mill may have 10 steel where a ball mill will typically have 30 .

Get Price### SAGMILLING Articles

Blank spreadsheet that is pre populated with the field names needed to import laboratory test results into the SAGMILLING circuit model testwork database subscription required Enter your test results one per row arranged into the columns indicated To import into your testwork database copy the block of cells starting with the top row

Get Price### MONSAG A new monitoring system for measuring the

Fig 2 shows a typical grinding circuit with a SAG mill and two ball mills Grinding power is split into the SAG and ball mills Commonly when the SAG mill stops its operation the other two ball mills should also halt Fig 3 outlines the charge motion in the mill

Get Price### Ball mill and sag mill girth gear trunnion head

Ball mill and sag mill girth gear trunnion head Both the ball mill and the sag mill can process non metals ferrous metals non ferrous metals rare metals etc and are divided into dry and wet types to meet the needs of various materials The structure of the ball mill and sag mill is similar In the rotary system the composition of the

Get Price### MILLING CONTROL OPTIMISATION

Figures 8 and 9 on the right show results from a gold plant s SAG mill achieved with MillStar s Segregated Ore Feed Controller combined with the Power Optimiser The standard deviation of the mill feed control is greatly reduced The cyclone feed is more stable allowing for consistent size separation and feed to downstream processes.

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

This would be achieved by connecting the expert system to the highest level of control ie provide the set points for the controllers Elber 1989 Over the last year or so further Help packages have been implemented These are a HelpSAG Designerused by Morgardshammar a leading Swedish mill manufacturer for optimizing SAG/Ball Mill circuits.

Get Price### Evolution of SAG Mill Process Control at the Xstrata

SAG Mill 24 diameter 2240 kW Variable Speed Double Deck Vibrating Screen 8 x 16 Cone Crusher Hydrocone H4800 250 kW ASRi Gap Control 6 x 15 Krebs GMAX Cyclones Ball Mill 14 dia x 21 2240 kW Flotation Underground Storage

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

In general the SAG mill manufacturers will control the addition amount of medium such as steel ball at 2 8 so that the capacity of semi SAG mill to process materials can be increased by 10 30 The SAG mill liners wear will increase by 15 due to the impact of medium such as steel ball during the SAG mill

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

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 motor 8 A SAG mill with a 44

Get Price### Inferential measurement of SAG mill parameters V MPC

SAG mill ball addition SMBA does not exist as a manipulated variable in the real plant Grinding balls are batch fed to the mill as dictated by the operator However the following points illustrate that overall the controller moves would have been consistent with what actually took place in the plant 4.2.1 Central to left most point

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

LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp57 62 Gross power No load power Net power drawn by the charge 8.13 The net power is calculated from Net power KD2.5L e c. Watts 8.14 In equation 8.14 D is the diameter inside the mill liners and Le is the effective length of the mill including the

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

Ball mill is a fine grinder A horizontal or vertical rotating cylinder which is filled partially with the balls of ceramics small rocks and balls made from stainless steel The ball charge of a SAG mill is about 29 to 30 By friction and influence of tumbling balls inside rotating cylinder grinds the raw material to the required fineness.

Get Price### MILLING CONTROL OPTIMISATION

Figures 8 and 9 on the right show results from a gold plant s SAG mill achieved with MillStar s Segregated Ore Feed Controller combined with the Power Optimiser The standard deviation of the mill feed control is greatly reduced The cyclone feed is more stable allowing for consistent size separation and feed to downstream processes.

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

This would be achieved by connecting the expert system to the highest level of control ie provide the set points for the controllers Elber 1989 Over the last year or so further Help packages have been implemented These are a HelpSAG Designerused by Morgardshammar a leading Swedish mill manufacturer for optimizing SAG/Ball Mill circuits.

Get Price### Expert mill control at AngloGold Ashanti

The ROM SAG mill circuit a brief description The typical ROM SAG mill circuit is depicted in Figure 1 The circuit is usually closed with either a screen or more commonly a cyclone for product size classification The focus of control can be divided into two parts viz the mill and the cyclone.

Get Price### Operation Analysis of a SAG Mill under Different

the ﬁll level ratio and the steel ball ratio on the SAG mill Finally through statistics and analysis of particle information and mill power under di erent conditions we analyzed the inﬂuence of three parameters on the particle fracture e ect in the SAG mill and obtained the best operating parameters of the SAG mill 2.

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

MILL CONTROL BALL MILL CONTROL EXAMPLE Process Description The copper concentrator in Pinto Valley Arizona processes a 0.4 grade copper ore from a nearby open pit mine The unit operations consisting of crushing grinding and flotation process about 65 000 tons of ore per day in six overflow ball mills.

Get Price### SmartMillGrinding ABB

Combine ABB s variable speed drive system with advanced process controlABB Ability Expert Optimizer for grindingto provide maximum mill control It can be applied to new or existing AG SAG and ball mills powered by either ring geared mill drives RMD or gearless mill drives GMD This solution was designed to control stabilize and

Get Price### Paper # 25Copper Mountain Overview on the Grinding

The grinding circuit for the Copper Mountain project consists of one FL SAG mill and two FL ball mills Figure 1Overview grinding circuit The Copper Mountain SAG mill is 10363 mm 34 feet in diameter and 6096 mm 20 feet long It is a grate discharge mill with an inside diameter of 10363 mm 34 feet and a grinding length of 5334

Get Price### Automated SAG Mill Speed Control Using On contact

There are two lines consisting of this SAGball mill combination where the SAGs are denoted as SAG1 and SAG2 Note Each SAG mill is operated in a closed circuit manner in conjunction with a typical trommel screen and pebble crushing circuit The ball mills are also operated in a closed circuit employing two hydrocyclone separators The

Get Price### SAG Mill Control It Shouldnt be that Hard

SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill The best way to measure load is to mount the mill on load cells.

Get Price### Optimization of SAG Mill Process Control at the Raglan Mine

A cone crusher reduces the SAG s discharge screen s oversize material A 14 foot diameter ball mill ensures final grinding before the flotation stage.Many control strategies were used at the SAG over the past few years Fuzzy Logic was first used in 2007 in order to control tonnage feed to the SAG.

Get Price### Small Scale Continuous SAG Testing Using the

autogenous mill with an 8 ball charge The test is run until a steady state is achieved similar to the Bond rod mill and ball mill tests A draft fan supplies the airflow required to remove the ground material from the mill and a collection system recovers the ground material from the air stream This includes a

Get Price### SAG Mill Expert System Grinding Circuit

SAG Mill Expert System Grinding Circuit The original process control interface consisted of a series of stand alone 4 20 ma controllers requiring the operators to dial in set points for the numerous processing parameters In many cases these controls were set to their manual mode of operation with the operators making all the dynamic process

Get Price### Autogenous and Semi Autogenous Mills FL

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### Welcome to Manta ControlsManta Controls

Manta Controls have developed the Manta Cube system where it is available for SAG Mill Control AG Mill Control Ball Mill Control Flotation Control Thickener Control and CCD Control Control of other process units are also available Read more

Get Price### SAG Mill Control It Shouldnt be that Hard

SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill The best way to measure load is to mount the mill on load cells The load cells are calibrated to measure the total weight of water grinding media balls and ore in the mill

Get Price### Frozen charge detection and automatic loosening with

Mill in Brazil and Lumwana having a 38ft 18 MW SAG and one 26ft 16 MW Ball Mill in Zambia all three mills put in operation in 2008 as well as Los Bronces Confluencia in Chile equipped with one 40ft SAG Mill of 22 MW and two 26ft Ball Mills of 16.4 MW commissioned in 2011 In the light of increasing interest in that technology various

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### A Method of C alculating Autogenous Semi

of large AG/SAG mills and large ball mills However it is necessary to discuss their operation because a Rod mill product has a similar slope to AG/SAG mills This product slope averages less than 0.5 when plotted on log/log paper and therefore contains an extra amount of ne material ﬁ compared to a PSD having a 0.5 slope This ﬁ ne material

Get Price### KIMA Process Controlinnovative measure and control

Advanced control systems innovative sensor developments and process engineering Vibration sensors for condition based monitoring 20 years of development and experience make us an attractive partner in many industry fields Our products optimise production save costs and enhance efficiency.

Get Price### sag and ball mill controlspsychologenpraktijkzicht

Difference Between Sag Mill vs Ball Millmech4study Ball mill is a fine grinder A horizontal or vertical rotating cylinder which is filled partially with the balls of ceramics small rocks and balls made from stainless steel The ball charge of a S mill is about 29 to 30 .

Get Price