The difficulty of stabilizing SAG mill load limits the effectiveness of feedback control approaches. Control is particularly difficult during periods when the feed ore is either unusually hard or fine. There is also a strong tendency to lose control during transient periods when feed ore changes. The control problem is also compounded by long …

Acoustic emissions monitoring could aid in-mill energy-efficient operation. Towards the development of an improved and more efficient online monitoring system in an industrial AG/SAG grinding mill, the present study employs a laboratory-based AG/SAG mill and acoustic sensor to investigate the acoustic characteristics of different mill …

SAG / Ball Mill Monitoring Condition Monitoring to Ensure Reliability for Critical Grinding Equipment in Mining Today's mining operations must keep crucial milling assets online and running optimally, but variations in ore particle size, feed rate and moisture content, can lead to plugging, high vibration and machine bearing wear, and ...

Semi-autogenous grinding mills (SAG mills) are tumbling mills that most commonly have a shell diameter-to-length ratio of around two. With this high aspect ratio, SAG mills generate both thrown and cascading ball-milling actions with shell linings shaped to lift and to throw alloy steel grinding balls of up to 150 mm (6 in.) in diameter. These

Model predictive control is able to optimize the control of processes that exhibit an integrating type response in combination with transport delays or variable interaction, …

SAG mill control requires 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 load cells are calibrated to measure ...

controls downwards; so without the advanced regulatory control layer, the comprehensive plant automation strategy cannot be properly built. In this paper, an industrially proven …

e) AG/SAG Mill Theory - Text 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.

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. Specifically designed for the SAG mill, a new device is presented that digitizes and processes vibration from three key points on the …

Considering the continuous increase in production costs and resource optimization, more than a strategic objective has become imperative in the copper mining industry. In the search to improve the efficiency in the use of resources, the present work develops models of a semi-autogenous grinding (SAG) mill using statistical analysis and …

Rocky DEM, a software tool developed by Brazilian company Engineering Simulation and Scientific Software (ESSS), predicts SAG mill liner wear over time and helps engineers adjust conditions for mill operations by …

A generalized SAG mill power draw equation developed by Austin, is given by: where the parameters used in the model are defined as: mp= net mill power (kW) K = a constant (kW/ton m0.5) D = mill internal diameter (m) L = mill length (m) J = fractional volume of mill filled by total charge. εB = effective porosity of the total charge.

Continuously improve, identify and test the controller – the overall objective is to stabilize SAG mill control for high ore variability. A stable SAG mill performance enables …

PRESS RELEASE: FL has launched SAGwise, a sensory and process optimisation system designed to optimise the use of the three main consumables in SAG milling: power, media and liners. The SAGwise total process control system can reduce energy consumption by up to 6%. This is a significant reduction considering that, …

2.4. Multivariable predictive control. In the present work, a three-input-three-output scheme of control was performed. The total water feed to the mill (the feed water flow rate was added to the dilution water flow rate, so they could be specified separately, but for the SAG mill model, the total water content was the variable of interest), the fresh ore …

To stabilize and optimize the operation, ramp up production and prevent damages to the SAG mill liners, Cía. Minera Antapaccay contracted with FL to implement …

feed and recycle crusher operation have resulted in the evolution of. control of SAG and AG mills to utilis e new advanced control techniques. These techniques are necessary to maintain stability ...

Over the past seven years, there have been approximately 40 projects globally working on installations of energy-efficient SER drives. With our SAG mill running at 65.4% critical speed (mill @ 8.7 ...

SAG mill control is essentially the stabilisation of mill load (and/or power) and density which can be implemented successfully and very cost-effectively on most modern PLC or …

In order to obtain the optimal operation parameters of a SAG mill, in this paper, the discrete element method (DEM) is used to simulate the breakage process of the particles by controlling three ...

(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia & Villanueva, 2013 [1]).

index by using values from an operating circuit. Its value is only valid at the stated SAG product size. • Transfer size (T80) is the term used to describe the SAG mill product that is sent to the ball mill. For peak performance and balancing the power available in the SAG mill and ball mill, the transfer size must be measured and controlled.

Apr 7, 2000. #6. This application of electronic ear is used to control the mass of mineral that is possible to mill. It's usually used in cement industry. This control loop is inverted; so if the sound decressed, the feed of the mill has to decressed. Also this measure is used to generate an alarm that cut the feed of the mill to avoid excess ...

The simplest controller would employ feedback (FB) only control by adjusting the SAG mill feed rate to maintain the SAG mill power draw at its set-point value. As with any feedback controller, such a system can only take action after a disturbance has affected the process and caused a measurable deviation from the set-point.

A knowledge base, consisting 13 inferencing rules, was built which embodies the SAG mill control strategy (have been using by control room operators) using fuzzy variables and membership functions and can be universally applied and customized to other industrial plants. Installation and commissioning of the system in Sungun SAG mill …

related to SAG mill performance and control is the power draw of the mill. Much attention has been given to predicting the power draw of the mill (Morrell, 1996a, Morrell, 1996b, Morrell, 2004 ...

Choosing a SAG Mill To Achieve Design Performance. John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, Grinding Travis Orser2, Project Manager, Grinding. Starkey & Associates Grinding Design and Process Engineering 336 – 268 Lakeshore Rd. E. Oakville, Ontario L6J 7S4 PH: (905) 465-7512 Fax (905) 844-5297.

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 …

SAG Mill Control Strategy using Profit Controller "ProfitSAG" applications have been implemented using Honeywell technology called "Profit ControllerTM"; this is a Multivariable Predictive Control algorithm based on models, also known as RMPCT (Robust Multivariable Predictive Control Technology). As its name points out, this …

The combination of LoadIQ™ smart sensor technology and the Advanced Process Control system, ECS/ProcessExpert®, will minimise critical impacts inside your mill to prevent …