· AG with a crusher + ball mill · SAG-Single Stage · SAG with ball/VERTIMILLTM liming’s process engineers welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of the milling plant. Our engineers can specify or supply computer control systems for the sophisticated
Model Predictive Control for SAG Milling in Minerals Processing 5 Model Predictive Control on a SAG Mill and Ball Mills The solution for the SAG Mill is an adaptive controller which controls mill load using direct mill weight measurement or indirectly from bearing oil pressure.
A Neural Network Model for SAG Mill Control SGS. At Ok Tedi, the introduction in 1999 of a MET expert system for SAG milling line at Ok Tedi consists of two SAG mills, each feeding a pair of ball mills.
GrindingExpert™ is a true turnkey solution for optimizing SAG and Ball mill circuits, and our technical abilities implementing it are second-to-none. The KnowledgeScape adaptive control solutions work together to see, listen, and think about the best way to increase tonnage and optimize SAG and ball mills at all times and for all conditions.
Oct 12, 2017· SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially.
Where I work now, Minera San Cristobal in Bolivia, we use sound control on both the SAG and Ball Mills. The result of this control is a 25% increase in throughput, over the plant design, with a 10% reduction in energy consumption; the mill is more efficient. The mill control manipulates the feed rate and mill speed depending on ore and liner
Jan 08, 2016· In this training module, we'll cover the workings of a semi-autogenous grinding mill, or SAG mill, that's designed to be the first stage of a grinding circuit. Ore that’s crushed in a primary
SAG Mill Control: It Shouldn’t be that Hard An economically appealing method for improving operations is available without the capital expense — get more out of a mill by applying the advanced control capabilities in the existing plant control system By Andrew Thornton
Every mining operation has a unique grinding process. liming has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.
Every mining operation has a unique grinding process. liming has experience of over 8,000 grinding mills globally, including manufacturing and delivering the largest SAG/AG mills in the world. Our experts welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of your mill.
SAG Mill Control: It Shouldn’t be that Hard An economically appealing method for improving operations is available without the capital expense — get more out of a mill by applying the advanced control capabilities in the existing plant control system By Andrew Thornton
Advanced Controller for Grinding Mills: Results from a Ball Mill Circuit in a Copper Concentrator Anoop Mathur, Sujit Gaikwad, upsets such as mill spills and/or power excursions in SAG mills, “centrifuging” in ball mills, BALL MILL CONTROL EXAMPLE Process Description
In addition to the new process equipment, the SAG mill was commissioned with all controls implemented on the new PLC software platform. This removed the control strategy limitations previously described. Additional mill control loops and measurements now included: Mill feed tonnage (automatic PI control operator or remote set-point from mill
We have implemented SAG and ball mill expert control solutions and thickener control in the past at cortez. Below are the results from the SAG mill optimization. SAG mill throughput was increased by 9.3%. It is interesting to note that the expert control of the SAG mill alone yielded a 6% increase.
There are two lines consisting of this SAG ball 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
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 Designer used by Morgardshammar, a leading Swedish mill manufacturer, for optimizing SAG/Ball Mill circuits.
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SAG mill coming out of a classical overload). These examples highlight a fundamental difference between ball mill and SAG mill control. While monitoring power draw alone is sufficient for ball mills, in SAG mills, both bearing pressure and power draw need to be considered for proper operation and control.
These signals along with an energy polar plot taken from the shell provide the real-time toe, material flow rate and ball strike energy occurring in the mill. For cement, MillScan is the easy to calibrate electronic ear replacement for real-time mill fill level monitoring and feeder control.
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.
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STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR OPTIMIZING THE GRINDING PROCESS IN SAG AND BALL MILLS *I. Atutxa and I. Legarra . (SAG) and ball mill circuits. This progression, however, has not always been accompanied by an improvement in
movement within SAG mills. The concepts for operating SAG mills have been inherited almost entirely from conventional ball mills. However, these mills operated under a constant ball load and at a fixed speed, the slurry load and properties being the main sources of concern. Under these relatively stable
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.
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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.
TECHNICAL AND COMMERCIAL BENEFITS OF GEARLESS MILL DRIVES FOR GRINDING APPLICATIONS M. Ahrens, ABB, Switzerland J. Gonser, ABB, Switzerland operating cost and reduce availability of ball and SAG mills. Options for variable speed are DC motors, energy recovery the mechanical mill brake control and the
SAG Mill Control . SAG mills can be optimized for maximum ore throughput or maximum grinding energy efficiency. In both cases, precise control of the mill filling percentage is critical (Wills and Napier-Munn, 2006). Maintaining constant mill weight, as indicated by bearing pressure, is one approach to stabilize the mill
and the broader holistic approach to mill control are discussed. 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
sag and ball mill controls Crusher South Africa. improved sag mill control. SAG Mill Control: It Shouldnt be that Hard So, in summary: Why use the existing Plant Control System to improve SAG mill control? Find the Right and the Top mode of operation of SAG and BALL mills for your coal handling plant! liming, a mining machines
STEPPING FORWARD: USING VARIABLE SPEED DRIVES FOR OPTIMIZING THE GRINDING PROCESS IN SAG AND BALL MILLS *I. Atutxa and I. Legarra . (SAG) and ball mill circuits. This progression, however, has not always been accompanied by an improvement in
movement within SAG mills. The concepts for operating SAG mills have been inherited almost entirely from conventional ball mills. However, these mills operated under a constant ball load and at a fixed speed, the slurry load and properties being the main sources of concern. Under these relatively stable
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. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit. A diagram of types of AG/SAG
commonly used control strategies are analyzed and discussed. 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 stone characteristics.
semi-autogenous (SAG) mill and two ball mills, each with 13 megawatts (MW) of installed power, was expected to be SAG mill limited when treating competent basement rock. Ausenco Services Pty Ltd (Ausenco), was engaged to help optimise and enhance the productivity of the Phu Kham comminution circuit over an eight-month period.
Transfer Size, T80: Is the 80% passing size of ore as it passes from the SAG mill to the ball mill. It is typically about 1/3 the size of the screen opening but can be coarser than 1/3, especially when a pebble crusher is used. Screening at 5 mm ensures that the T80 will be about 10 mesh (1.7 mm) ensuring that the ball mill will work efficiently.
Model Predictive Control of SAG Mills and Flotation Circuits Andritz This was a direct results of ball impact due to lack of protection which would . the SAG and ball mill circuits, it was decided that the most promising course of ac-. Read More. design sag mill production when you need it
commonly used control strategies are analyzed and discussed. 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 stone characteristics.
semi-autogenous (SAG) mill and two ball mills, each with 13 megawatts (MW) of installed power, was expected to be SAG mill limited when treating competent basement rock. Ausenco Services Pty Ltd (Ausenco), was engaged to help optimise and enhance the productivity of the Phu Kham comminution circuit over an eight-month period.
Transfer Size, T80: Is the 80% passing size of ore as it passes from the SAG mill to the ball mill. It is typically about 1/3 the size of the screen opening but can be coarser than 1/3, especially when a pebble crusher is used. Screening at 5 mm ensures that the T80 will be about 10 mesh (1.7 mm) ensuring that the ball mill will work efficiently.
Model Predictive Control of SAG Mills and Flotation Circuits Andritz This was a direct results of ball impact due to lack of protection which would . the SAG and ball mill circuits, it was decided that the most promising course of ac-. Read More. design sag mill production when you need it
control the performance of autogenous grinding (AG) mills, ball mills and cyclone classifiers. Control of power draft and mill load in AG and SAG mills has traditionally been by load cells
the mill and its ball charge moving, any in ing expert system and DCS-based controls. SAG mill #1 load control Plant staff, after extended testing and rigourous data analysis, determined that BrainWave reduced load variability by 14% BrainWave: Control solutions for SAG mills
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%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.
Optimization and Control of a Primary SAG Mill Using Real-time Grind Measurement C.W Steyn*, K Keet**, W Breytenbach*** explains the Anglo American Platinum (AAP) control philosophy for Run-of-Mine ball mills as implemented at Mototolo Joint Venture. This includes a layered approach that involves synchronizing the WvalC primary SAG mill
TECHNICAL NOTES 8 GRINDING R. P. King. 8-2 &ROOLVLRQ 5ROOLQJ ZLWK QLSSLQJ Figure 8.5 Effect of mill filling on power draft for ball mills. The data is taken from Rexnord Process Machinery LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62.
of the set point optimising control system is planned to be completed by mid 2002 and comprises of a supervisory grinding circuit control system Prior to the SAG mill control system being implemented the control room which over looks the SAG mill and the ball mills to produce a grinding operator used to run the SAG mill manually.
BrainWave: Control solutions for SAG mills ANDRITZ. BrainWave Control solutions for SAG mills. 02 The solution: Measure. Control. And profit. BrainWave SAG mill is a unique control package using patented model-based predictive adaptive control technology. It is well known within the mining industry that effective grinding in a SAG mill depends
Range of SAG, ball, and rod mills for capacities under 3.1 MW. Mill control system. The optional Outotec mill control system features the latest in state-of-the-art technology and is the preferred control option for all Outotec grinding mills.
II-314 RoM Ball mills a 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
BrainWave: Control solutions for SAG mills BrainWave Control solutions for SAG mills. 02 The solution: Measure. Control. And profit. BrainWave SAG mill is a unique control package using patented model-based predictive adaptive control technology. It is well known within the mining industry that effective grinding in a SAG mill depends. Get price