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
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 ...
Apr 29, 2002· This paper demonstrates the design of a robust control scheme for a semi-autogenous grinding (SAG) mill. Feedback (FB), feedback plus feedforward (FF) and reduced order (i.e. less complex) robust controllers were all developed and tested—each providing tight control over the SAG mill power draw by adjusting the feed rate to the mill.
SAG Mill Success—Start with the Basics ... can result in less-than-optimum performance and make it difficult to achieve satisfactory mill control. In fact, at least in part because of the attention that must be given to the care and feeding of SAG mills, producers have begun to look increasingly favorably at highpressure grinding rolls as a ...
Advanced Controller for Grinding Mills: Results from a Ball Mill Circuit in a Copper Concentrator ... (SAG) mills. Given this large operational ... The first successfully implemented multivariable process control (MPC) is described for a SAG mill circuit in a bauxite …
The results in SAG-Mill line 2 are even more dramatic. Because of segregation on the coarse feed stockpile, SAG-mill 2 receives a higher percentage of coarse material. The KnowledgeScape strategy’s ability to maintain smooth and stable operation of the mill was more apparent when contrasted to the DCS control on the “difficult” line.
mill and drive involved. In modern grinding, ball mills and SAG mills are two types of mill commonly found. Grinding mills Ball mills Ball mills vary in their details and size but the basic design consists of a horizontal hollow cylinder, with an abrasion-resistant interior, that rotates about its central axis.
SAG Mill Control Instability: Causes and Solutions. Oscillatory unstable behaviour in a SAG mill is characterised by the mill constantly cycling between an overload condition and recovery from that condition by a substantial reduction in feed rate tonnes. Such behaviour is commonplace with SAG mills and gives rise to a significant overall ...
May 20, 2019· price mining large capacity wet autogenous mill· Sag Mill, Wholesale Various High Quality Sag Mill Products from Global Sag Mill Suppliers and Sag Mill Factory,Importer,Exporter at mining large ...
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.
Oct 01, 2014· 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 feed rate, and the mill rotation speed ...
SAG is an acronym for Semi-Autogenous Grinding. SAG mills are autogenous mills but 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.
SAG mills are the main workhorses in the majority of comminution circuits globally. They need to be fed and kept working round the clock. But challenges can arise when capacity is not optimised causing unnecessary downtime and liner wear leading to the one sound operators do not want to hear - the sound of the mills standing still.
Performance enhancement tools for grinding mills D.G. ALMOND* and W. VALDERRAMA† *FFE minerals USA Inc., Performance Enhancement Technology, Bethlehem, PA USA †Federico Santa Maria Technical University, Department of Materials Science, Valparaiso, Chile Operation of large SAG mills requires a change in the conceptual approach to grinding ...
Autogenous and Semi-Autogenous Mills The optimum solution for wet grinding. 2 AG/AG Mills AG/AG Mills 3 ’s AG/SAG mills accomplish the same size reduction work as 2 or 3 stages of crushing and screening ... with circuit and circuit control design as well as start-up, operation,
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 DCS platforms. The application of advanced regulatory control is a MIPAC speciality which we have applied productively in SAG milling and other mineral beneficiation ...
SAG Mill Control at Northparkes Page: 1 p>
SAG MILLING IN AUSTRALIA – FOCUS ON THE FUTURE Greg S Lane Principal Process Engineer, GRD Minproc ... future developments are anticipated in mill design and control, and competing processes are identified. ... circuiting of the SAG mill and ball mill additions topping the list.
SAG and AG Mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill.
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 ...
The experience gained from installation and operation of these mills enables us to offer mills of up to 35,000 installed horsepower or more. Today a single grinding line with a Gearless SAG mill and appropriate ball mills can process over 100,000 mtpd.
The SAG Mill is a block added by the EnderIO mod. A machine similar to a Pulverizer or a Macerator. It 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 tick.
To prevent spillage and overload, the control scheme must allow the ball mill circuit to accept almost any amount of feed rate without overload. At high feed rates, this will compromise the grind size, so the SAG mill feed rate limits must be managed to ensure the right grind size versus throughput tradeoff is …
“Most mills have customers counting on just-in-time delivery of mill products. So anytime one of our mill clients needs repairs or upgrades, it’s all hands on deck to get the job done right, as fast as safely possible. FLANDERS has replaced a hot mill automation system in a week and rebuilt a reversing mill armature in three.
Using Fuzzy Control to Optimize SAG Mill Production Lynn B. Hales, KnowledgeScape Systems, a Division of EIMCO, Salt Lake City, UTAH Charlie Moquin, KnowledgeScape Systems, a Division of EIMCO, Salt Lake City, UTAH
platform, the SAG mill’s new control system uses a unique process control Gold Fields St Ives SAG mill main feed conveyor with classification tower and hydrocyclone classifiers on top, a key element of the comminution circuit. algorithm called the ‘Manta Cube’.
445 PAPER 28 Evolution of SAG Mill Process Control at the Xstrata Nickel Raglan Operation Erik Bartsch1, Chief Engineer Guy Comeau2, Senior Metallurgist Colin Hardie3, Former Chief Metallurgist 1 Process Control Group, Xstrata Process Support 6 Edison Rd, Falconbridge, Ontario
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.
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
Choosing a SAG Mill To Achieve Design Performance John Starkey1, Principal Consulting Engineer Sami Hindstrom2, Manager, Grinding Travis Orser2, Project Manager, Grinding 1 Starkey & Associates Grinding Design and Process Engineering 336 – 268 Lakeshore Rd. E. Oakville, Ontario L6J 7S4
SAG mill control is essentially the stabilisation of mill load (and/or power) and density which can be implemented successfully and very costeffectively on most modern PLC or DCS platforms. The application of advanced regulatory control is a MIPAC speciality which we have applied productively in SAG milling and other mineral beneficiation ...
MODEL PREDICTIVE CONTROL OF SAG MILLS AND FLOTATION CIRCUITS *Michael G. Forbes and Bill Gough . ANDRITZ AUTOMATION Ltd. 100 – 13700 International Place Richmond, BC V6V 2X8 Canada (*Corresponding author: firstname.lastname@example.org) ABSTRACT . Precise control of SAG mill loading and flotation cell level is critical to maximize production and
If the SAG mill is not intended to be the rate-limiting step in a process plant, then it is best to adjust the SAG load (and power) to hold a constant tonnage to satisfy another constraint elsewhere. Underground mines are an example: the hoisting capacity of the mine shaft is the rate-limiting step in the process, and the SAG mill must adapt to ...
SAG 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 1.5%. This was a great success for everyone involved. ... BrainWave: Control solutions for SAG mills ...
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