Advanced Controller for Grinding Mills: Results from a

(MPC) is described for a SAG mill circuit in a bauxite processing refinery at Wagerup, Australia (Refs: Gopinath, Mathur et al, 1995 and Le Page, Freeman et al 1996, Luse, Mathur et al 1997). The MPC controller presented in this paper is perhaps the first successful implementation of MPC for ball mills

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SAG mill Archives

Jundee's processing circuit comprises a two-stage crushing circuit, SAG and ball mill, and conventional carbon-in-leach plant. The ball mill upgrade, undertaken by DRA, increased processing plant capacity to a nominal design throughput rate of 2.7 Mt/y, from 2.2 Mt/y.

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SAGMILLING.COM .:. Articles

SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how muc h pow er wi [↓ read more ↓] Alex Doll: modelling: A simple estimation method of materials handling specific energy consumption in HPGR circuits

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Starkey Associates Inc.

John Starkey, P. Eng. has worked in SAG mill hardness testing since 1964 where he worked as pilot plant engineer for A. MacPherson's projects. He invented the SPI and SAGDesign tests. The latter is now acknowledged by our clients to be a world-class method for grinding circuit design, and is accepted by our peers as a standard for ore

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PACIFIC BOOKER MINERALS INC

The front end of the circuit is comprised of run-of-mine material feeding directly into a gyratory crusher. The product from the crusher feeds the 30,000 t live capacity crushed ore stockpile. Apron feeders are used to feed the conveyors, which transport the crushed material to one SAG mill. The product from the SAG mill

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Grinding Sample Clauses

Ore is ground to rougher flotation feed size in a semi-autogenous (SAG) mill primary grinding circuit and a ball mill secondary grinding circuit.The SAG mill operates in closed circuit with a vibrating screen. Water is added to the SAG mill to produce a slurry and the ore feed size is reduced as it traverses the SAG mill.

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Optimizing Performance of SABC Comminution Circuit of the

It is commonly referred to as a SABC circuit, for Semi-Autogenous Ball mill Crusher (SABC). This circuit shows a semi-autogenous grinding (SAG)/ball mill circuit where both grinding mills are in closed circuit, with the SAG mill closed with a crusher to control the amount of 'critical size' material in the circuit.

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Ball Mill Explained

Multiple stages may include a rod mill followed by a ball mill (two stage circuit), or a semi-autogenous grinding (SAG) mill followed by a ball mill (two stage circuit). Smaller plants tend to add extra crushing stages in order to operate a single grinding stage only. If a ball mill uses little or no water during grinding, it is a 'dry' mill.

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MILLING CONTROL OPTIMISATION

circuit, which improved screen performance and thus increased throughput and reduced circulation load. 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

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Modelling SAG milling power and specific energy

Jan 01, 2015In his approach the total specific energy of the entire AG/SAG circuit is firstly predicted using the SAG mill feed F80 and the ball mill cyclone overflow P80. Morrell's model ( Morrell, 2011 ) relates the feed, mill geometry and operating conditions to the specific energy of the circuit.

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Demo

The demo contains a pre-programmed SABC circuit and 3 rougher cells (SABC: SAG mill closed with a recycle crusher, followed by closed Ball mill / Cyclone circuits). The functions demonstrated in the demo exercise are mass balancing, model building and simulation. Various common problems can be simulated using the demo and advice on how to fix

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SAG

The SAG/Ball Mill Circuit has an overall processing capacity of 2300 TPD. A 20.0 ft x 7.5 ft, 1500 HP fixed speed SAG Mill is fed with ore coming from four feeders.

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Grinding Circuit Design for Adanac Moly

in a SAG and Ball mill circuit where there is no scope for storage capacity between milling stages and throughput is normally limited by a bottleneck at one stage or the other. In this case any ore with a high BWi value will have reduced . throughput due to the ball mill despite the capability of the SAG mill

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Gold Fields Granny Smith Grinding Circuit: A Metallurgist

The single-stage SAG mill circuit was shown to efficient operate ly on primary crushed, Wallaby Deeps underground material. With relatively coarse, competent feed and a reasonable ball charge, the variable speed SAG mill generated a product with sufficient fines content that the cyclones could manage without excessive recycle.

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DYNAMIC MODELLING OF A SAG MILL

In a semi-autogenous grinding (SAG) mill and pebble crusher circuit, the behaviour of the comminution process is non-linear and time-varying due to wear and variations in the feed material. To describe such a complex system, data-driven models were introduced, along with a case study of a SAG mill circuit in Copper Mountain, British Columbia, Canada.

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to Design and Supply the World's Largest SAG Mill in

Oct 05, 2010"Concentrator plants keep getting larger and larger," he says. "This new mill will be a significant development for the future." He goes on to explain that "a single line grinding circuit with a 42ft (12.8m) SAG mill allows for much higher concentrator throughputs, as compared to using a dual line grinding circuit using two SAG mills.

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Grinding Circuit

The Grinding Circuit optimization Application is the first technology to accurately predict critical SAG Mill performance variables. It then correlates this data to give an accurate picture of conditions inside the mill. This allows mines to reduce downtime in operations by reducing scheduled liner wear inspections and unnecessary changes.

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Power

considered, such as a primary SAG and secondary ball mill circuit where the individual stages would be ESAG and Eball, and the combined total circuit CEE would be Etotal. In all cases, the specific energy consumption is defined as the motor power consumed relative to the shell of the mill (a.k.a.

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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. The importance of cyclone performance should

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Electronic ear in SAG mill

Aug 25, 2004We 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.

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Model:Morrell Mi SMC SAG

Ball mill Operating strategy when circuit is SAG-limited (note, fixed speed ball mills can only be vary P 80) Optional parameters. Description and Comment are optional text fields; Maximum t/h limit is a t/h throughput above which a warning message is displayed (but does not actually limit the throughput).

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Gold extraction

Of the numerous major gold mining operations around the world, most utilize a primary crushing circuit which flows into a SAG mill circuit and then a ball mill circuit. The primary reason for the significant comminution circuits is because in gold mining the grades are notably low and thus excessive waste material is present, resulting in high

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Dynamic Modeling and Simulation of SAG Mill Circuits with

and Graham Bonn, Dynamic modelling of a SAG mill – pebble crusher circuit by data-driven methods, presented in proceedings of SAG conference 2019, Vancouver, September 2019. Paper D. Li, Haijie, Magnus Evertsson, Mats Lindqvist and Gauti Asbjrnsson, A data-driven method to isolate the effect of pebble recycling on AG/SAG mill circuit. To

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Model Predictive Control

The behavior of the SAG mill circuit is multivariable i.e. exhibit complex interactions and nonlinear behavior between the process variables. It is also dynamic i.e. delay times between variables within the process need to be considered before control actions are executed. Given these challenges, the objectives for acceptable SAG mill operation

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Freeing up milling capacity in a SAG mill ball mill

Jul 08, 2016Where the SAG mill/ball mill circuit is the bottleneck in the processing plant the pebble circuit can be a significant factor in limiting overall plant capacity. The pebble circuit recirculating load can be very significant (depending on the ore characteristics and SAG mill operating dynamics).

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the bigger of the world sag mill

Sag Mill Grinding Circuit Design: jun 06, 2016 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 variant of this method is to direct pebble-crushing circuit product to the ball-mill sump for secondary milling: while

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SAG Mill

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.The energy storage capacity and processing speed can be increased by adding one of 3 tier of Capacitor into

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Siemens modernises SAG mill gearless drive in Cadia Valley

Mar 27, 2012This two-stage grinding circuit consists of a 40 ft SAG mill with a 20 MW Siemens gearless drive and two parallel 10 MW gear driven ball mills. Siemens has now fitted the SAG mill with a Sinamics SL 150 cycloconverter for closed-loop control as well as with a Sinamics DCM control module for the excitation circuit – the first time that both

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sag and ball mills principlespdf

The 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

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Using Fuzzy Control to Optimize SAG Mill Production

Sag Mill Example To illustrate the power of fuzzy logic we will next look at its application in controlling a typical sag mill circuit as is shown in Figure 2. Figure 2. Typical Sag Mill Configuration as Defined in KnowledgeScape. An example of controlling SAG mill speed will be

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AG mills

Gearless mill drive (GMD) technology has further expanded the use of large AG milling allowing Outotec to produce the world's largest SAG mill of 42' in diameter drawing power at 28 MW. Today, Outotec is the world leading supplier of gearless AG mills operating globally.

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A milling circuit employs SABC, SAG mill product is

A milling circuit employs SABC, SAG mill product is wet screened; - Screen undersize goes into a mil discharge sump and is pumped to cyclones. Cyclone overflow is fed to flotation while cyclone underflow is fed by gravity to the ball Mill for further grinding.

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