sag mill control

OPTIMAL SAG MILL CONTROL USING VIBRATION & DIGITAL …

The basic goals of SAG mill control using these new signals is to increase and stabilize the throughput of material through the mill to cut specific energy consumption and extend liner life. This is accomplished by performing the following steps: 1.

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Evolution of SAG Mill Process Control at the Xstrata ...

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

SAG Mill Process Control - Grinding & Classification ...

An industrial example of its use is for the problem of SAG mill feed rate control, shown in Figure 12, which is notoriously difficult for a PID controller due to the long dead time. Figure 13 shows the results of on/off testing comparing Dahlin and PID control. Jean Rasczak. 6 years ago. Jean Rasczak 6 years ago.

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 ...

(PDF) Robust control of a SAG mill | manuel villon ...

SAG mill control proportional to the mass of balls within mill: dB In general terms, the benefits sought from improved ¼ Bi BrB ð4Þ primary grinding circuit control include increasing through- dt put at the desired grind size, reduction of grinding ball The remaining modelling equations comprise mass balance consumption and minimisation of ...

Geomagic Control X - SAG Mill Volume in Sections - YouTube

Learn how to calculate a Volume at different heights using CONTROL X for Sag and Ball Mills using View Clip and Enclosed Volume option.More information at: g...

Membership functions for SAG mill feed power draw ...

Successful control of Semi-Autogenous Grinding (SAG) mill circuits has been the subject of many researches and main concern of plant operators for years.

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Mill Process Control Automation Control System Back. Ore Receiving; Solids Level Measurement Smart Meter Verification Ore Receiving Back. Conveying ... Semi Autogenius Grinding (SAG) Mill Back. Cyclone Control; Expert Cyclone Control Cyclone Control Back. Acid Plant; Emissions Analysis Acid Plant Back. Flotation ...

Using Fuzzy Control to Optimize SAG Mill Production

fuzzy SAG mill control system. Although, while relatively unknown, fuzzy control systems have already proven their value in a number of grinding control systems as compared to more traditional crisp expert control systems. This partially due to the fact that fuzzy logic is naturally easy to understand and maintaining a control strategy specified in

SAG Mill Control: It Shouldn't be that Hard | E & MJ

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 ...

Noise Monitoring That Prevents Mill Damage | Brüel & Kjær

SAG mills are primarily used at gold, copper and platinum mines where steel balls are used for the grinding. The Manta Controls Advanced Control System, called the SAG Cube, automatically monitors and controls a SAG Mill, keeping track of critical …

Throughput optimisation in milling circuits

SAG mill discharge control is quite involved due to few interactive variables, such as mill discharge sump level, classification hydro-cyclone variables (feed density, flow and pressure) and water feed rate to the sump. Model predictive control (MPC), which is a multi-input multi-output (MIMO) controller, is very suitable for this purpose. ...

telfer sag mill liner in zimbabwe

Vulco® Mill Lining Systems | Weir Group. The innovative designs of Vulco© mill liners are tailored specifically for every customer and are manufactured to the highest industry standards for autogenous (AG) and semi-autogenous (SAG) mills, primary, secondary, and …

Products - Manta Controls

The Manta Cube ® system can be used to control various processing units and has been successfully used for SAG Mill Control, Ball Mill Control, Flotation Control, Thickener Control, CCD Control and more.

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SAG Mill Optimization using Model Predictive Control

Control of -SemiAutogenous Grinding(SAG) mill weight is an example of an important process that exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., & Mainza, A.N. 2009).

Studies Show Snags to Mill Optimization | E & MJ

For example, models have helped "us with the grinding process where there is a 10 to 15 minute residency time for all of the raw inputs that go into our SAG mills," he said. The control "is able to keep throughput at a much more constant range than we had under manual control." Stability improved by 32%.

Process optimisation for your SAG Mill - FL

An automated control system for your SAG Mill. To monitor and respond to critical impacts and changing conditions such as liner wear and ore variation, ECS/ ProcessExpert uses LoadIQ which is a self-powered smart sensor attached to …

SAG Mill - goldcilplant.com

The running largest SAG mill is more than 13 meters in diameter, the full automatic control of the SAG mill has already been developed and applied, and now it is being gradually accepted and used in gold industry. Technical Parameters of SAG Mill. The capacity of the SAG mill is related to lots of factors such as feed size, size distribution ...

Improved mill control at Lihir Gold Mine in Papua New ...

Instead, SAG mill process control systems that aim to maximize SAG mill federate should target operation at the optimal volumetric mill filling for the prevailing feed. Despite the importance of volumetric mill filling, a measurement is not traditionally provided to the mill operator or metallurgist by instrumentation (Toor, 2015).

AG & SAG Mill for Mineral Processing Wet & Aerofall SAG ...

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 operation.

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Toe angle measurement for SAG mill control at Lihir gold mine

SAG Mill process control classically maintains the SAG mill volumetric filling within a set operating range. Typically a SAG mill weight measurement, by either bearing pressure transducers or load cells, is used as an inferred measurement of volumetric filling. To maintain volumetric filling within a set operating range the SAG weight setpoint use for process control …

JKMRC researchers tackle SAG mill fill productivity ...

"The models capture data from commonly installed sensors around SAG mills, which allows the model to run in real time, giving the operator instant feedback on the critical conditions that affect mill performance," Mohsen Yahyaei says

SAG Mill Grinding Circuit Design - 911metallurgist.com

By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading the SAG circuit (Mosher et al, 2006). A variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while convenient, this has the ...

AMIT 135: Lesson 6 Grinding Circuit – Mining Mill Operator ...

SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill

How grinding mill design changed over the last 30 years ...

Grinding mills are some of the most important equipment in mines, processing over a few thousand tons of ore every hour. It is not uncommon to see these days that a single line of a grinding circuit consisting of a Semi Autogenous Grinding (SAG) mill followed typically by two ball mills generating over USD $1 million of revenues per day.

Model Predictive Control - Rockwell Automation

Mill size a 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. The solution automatically controls

CURRENT TRENDS IN SAG AND AG MILL OPERABILITY AND CONTROL

control of SAG and AG mills to utilis e new advanced control techniques. These techniques are necessary to maintain stability and optimise the. performance …

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.

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 ...

Sag Mill Control - Manta Controls

4. The SAG mill weight (tonnes) Figure 10. The performance of Train 1 SAG Mill - before the new Manta Cube. It can be seen from this set of operational data that the mill weight varies over a wide range and this is consistent with normal operator control of a SAG mill. The Manta Cube was then configured on both SAG mill trains at Telfer

Sag Mill In Gold Fields Processing

SAG Mill Grinding Circuit Design - 911metallurgist. By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still unloading By combining with SAG discharge and screening on the SAG discharge screens, top size control to the ball-mill circuit feed is maintained while still …

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