Model Predictive Control of SAG Mills and …
controls downwards; so without the advanced regulatory control layer, the comprehensive plant automation strategy cannot be properly built. In this paper, an industrially proven …
Minding the Grind: Maintenance Options to Keep …
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 …
AG/SAG mill acoustic emissions characterisation under different
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 …
A CRITICAL REVIEW OF GRINDING DESIGN …
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.
Semi-autogenous grinding (SAG) mill liner design 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
SAG Mills Archives
AG and SAG mills are now the primary unit operation for the majority of large grinding circuits, and form the basis for a variety of circuit configurations. SAG circuits are common in the industry based on: High single-line capacities (leading to capital efficiency) The ability to mill a broad range of ore types in various …. Read more.
Real-Time Simulation and Control of a SAG Mill
In this work, several standard tools such as Simulink R /Simulink R, OPC toolbox, RSLogix 5000, and FactoryTalk R are integrated to simulate a control strategy for a SAG mill designed to keep the ...
[PDF] OPTIMAL SAG MILL CONTROL USING VIBRATION
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 …
Semi-Autogeonous (SAG) Mill Overload Forecasting
1 Introduction. In mining, a Semi-Autogenous Grinding mill (SAG) is the equipment used at mineral processing plants in the size reduction process, making the ore suitable for the next stage of flotation. Its use lies in significant processing and reduction capability offered by this kind of mill, where maximize the operational continuity and ...
Model predictive control of semiautogenous mills (sag)
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 …
Understanding the SAG Mill in Copper Ore Mining Process
A SAG mill, or semi-autogenous grinding mill, is a type of machine used in mining and mineral processing operations. It uses the crushing and grinding action of rocks to reduce materials such as copper ore into smaller pieces for further processing. Unlike traditional mills that rely on steel balls or other media to break down materials, SAG ...
A plant-scale validated MATLAB-based fuzzy expert system to control SAG
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 …
SAG Mill | Autogenous and Semi-Autogenous Mills
Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
Autogenous Grinding & Semi Autogenous Grinding …
An autogenous circuit is difficult to control final grind. Autogenous plus crusher. This circuit was difficult to control and resulted in low tonnage. ... Semi-autogenous plus ball mill has been the "work horse" of mills. SAG vs Ball Mill Advantages . AG & SAG Mill Grinding Compared – Which is Best. Grinding rods and balls can be …
Process optimisation for your SAG Mill
The combination of LoadIQ™ smart sensor technology and the Advanced Process Control system, ECS/ProcessExpert®, will minimise critical impacts inside your mill to prevent …
SAG Mill Optimization using Model Predictive …
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: It Shouldn't be that Hard
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 ...
Toe angle measurement for SAG mill control at Lihir gold …
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 …
FL launches SAGwise total process control
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, …
(PDF) Robust control of a SAG mill | OMAR GALAN
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.
SAG Mill Control at Northparkes Mines ( Not So Hard After …
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 …
Application Note SAG Mill Control
Effective SAG mill control will maximise throughput, minimise damage to mill internals (liners and lifters) and contribute significantly to achieving maximum recovery in flotation. Well designed and implemented SAG control will payback in weeks not years. SAG mill control is essentially the stabilisation of mill load (and/or power) and density
An Expert System for Control of a Sag/Ball Mill Circuit
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.
(PDF) Reinforcement learning control of a SAG mill grinding …
control of a SAG mill closed with a pebble crusher using industrial data from an operation. A comparison with advanced mod el - based process control is provided, showing the benefits and ...
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.
Minding the Grind: Maintenance Options to …
When SAG mill liner bolts loosen, break or stretch beyond limits, liner impairment and degraded performance are generally next on the agenda, followed by mill stoppage for repair or replacement. ... McLellan …
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 …
CURRENT TRENDS IN SAG AND AG MILL …
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 ...
Application Note SAG Mill Control
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 …
(PDF) Operation Analysis of a SAG Mill under Different
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 ...