Robust control of a SAG mill It is now well accepted that process automation, closed-loop control and optimisation technologies enable higher feed rates, more consistent product qualities, lower utility usage and higher yields in a diverse range of process industri In the minerals processing industry, as a general rule, it is advisable to ,

Sales OnlineAug 25, 2004· We have an application in a SAG Mill where we have installed an electronic ear in order to listen the noise produced by the balls falling to the bottom of the mill Our idea is to convert the amplitude and frequency of noise to a 4-20mA signal (or something else) in order to determine if the ball is crushing the mineral or the mill lining

Sales OnlineSAG 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 ,

Sales OnlineOPERATION OF A SINGLE STAGE MILL Control PhilosophyIn a single stage SAG mill, there are two regimes of breakage that must be controlled in order to maximise power efficiency and hence capacity These are the high energy coarse rock breakage, load control and low energy breakage to control circulating load and to meet the target product size ,

Sales OnlineABB’s GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This ’workhorse’ for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability ,

Sales Onlineof the SAG mill load controller, the existing controller was replaced with a more enhanced controller that was developed and implemented as a part of the supervisory control system Figure 3- Results of the SAG mill load controller The enhanced controller displays a greater than 30% reduction in

Sales OnlineControl 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, MS, van der Westhuizen, AP, & Mainza, AN 2009)

Sales OnlineFlow Control has become a separately listed independent company called Nel Neles is a flow control solutions and services provider for oil and gas refining, pulp, paper and the bioproducts industry, chemicals, and other process industri

Sales OnlineMay 25, 2016· Examinamos los principios del rompimiento de mineral en un molino SAG e identificamos los parámetros que gobiernan el quebrado de la roca y el rendimiento S,

Sales OnlineThe control strategies were developed with the following main goals in mind: SAG mill weight stability and preventing of over filling of the mill Reduction of undesirable critical impacts, trough the integration with the impactmeter SAG mill throughput optimization and improve energy efficiency

Sales OnlineSAG 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 ,

Sales OnlineThe SAG Mill is a block added by the EnderIO mod A machine similar to a Pulverizer or a MaceratorIt is used to process resources to produce dust It accepts energy in the form of Redstone Flux or Minecraft Joule, with an internal buffer of 100,000 RF and consumption of 20 RF per tickThe energy storage capacity and processing speed can be increased by adding one of 3 tier of Capacitor into ,

Sales OnlineDEVELOPMENT OF A SAG MILL CONTROLLER Owing to the highly variable feed conditions, the mill required the constant attention of plant operators in order to prevent overloading or losing the SAG charge resulting in consequent damage to liners Focus was therefore placed specifically on improving SAG control

Sales OnlineSAG mill optimisation Take control of your SAG mill process Reducing downtime through data Downtime is the most inefficient thing of all for a processing plant, costing hundreds of thousands of dollars each hour Mill loading is key to running the mill more efficiently and at lower expense

Sales OnlineSingle 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 43m through 122m in diameter with powers as high as 28,000 kW

Sales OnlineSAG mill control, insight, and reliability!!!!! The throughput and efﬁciency of a SAG mill depends on the volumetric load: An overloaded mill has reduced coarse ore breakage, as the cascading balls and rock cannot drop far enough, reducing kinetic energy for breakage An underloaded mill will break coarse ore well, but at the expense of ,

Sales Onlinecontrol 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

Sales Onlinesag milling control grinding mill 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 amp Mainza A N 2009

Sales OnlineMill application featur Frozen charge protection – Detects frozen charge in the mill, minimizing equipment wear and liner replacements; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damag; Stand-still detection – Prevents the motors from re-starting if the mill is still rocking or moving after a stop ,

Sales OnlineSAG mill #1 load control Plant staff, after extended testing and rigourous data analysis, determined that BrainWave reduced load variability by 14% while increasing production by 15% This was a great success for everyone involved Assuming a copper price of 4 USD/lb, ANDRITZ AUTOMATION estimates that BrainWave SAG mill led to an extra 12M USD

Sales Onlinein tonnage or SAG mill feed density are returned to the DCS PID controllers Fuzzy sets are defined for all the measured parameters Each attribute is normalised, and its span divided into fuzzy belief valu A typical example is the SAG Mill 1 Bearing pressure (described later in Figure 3) These fuzzy belief values are used as inputs to 80

Sales OnlineThe grinding circuit for the Copper Mountain project consists of one FL SAG mill and two FL ball mills Figure 1 - Overview 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

Sales OnlineFigures 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 process

Sales OnlineTo participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding OR Select a Topic that Interests you Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent) Using Add Reply allows you to Attach Images or PDF files and provide a more complete input Use Add Comment = to comment on someone else’s ,

Sales OnlineThe controller features critical monitoring during the starting period, protecting the mill against damage when dropping a frozen charge As the loaded mill starts up, the control system evaluates torque build-up, ensuring that appropriate decisions are taken before a frozen charge can drop and damage the mill body or the mill bearings

Sales OnlineJan 01, 2013· A cone crusher reduces the SAG’s discharge screen’s oversize material A 14 foot diameter ball mill ensures final grinding before the flotation stageMany 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

Sales Onlinemill diameter, mill length, grates openings, and pebble ports size; the power equation is also function of all the operational variables selected for this study The applied force is a function of the mass inside the mill and it is composed of balls, ore and water The ball charge is a function of the bulk fraction of the SAG mill volume (Jb)

Sales OnlineSAG 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 ,

Sales OnlineFeedback (FB), feedback plus feedforward (FF) and reduced order (ie less complex) robust controllers were all developed and tested—each providing tight control over the SAG mill power draw by ,

Sales OnlineEnhanced mill performance SAGwise total process control uses specially designed acoustic sensors and proprietary process control software to monitor and respond to critical impacts inside your SAG Mill Conditions inside your mill are automatically adjusted to minimise liner damage, stabilise and then optimise the operation of a SAG Mill

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