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

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OPTIMAL SAG MILL CONTROL USING VIBRATION & DIGITAL SIGNAL PROCESSING TECHNIQUES *Karl S. Gugel, Ph.D. Digital Control Lab, 4647 NW 6th St. Gainesville, Florida USA 32609 (*Corresponding author: karl.gugel@digitalcontrollab) VANCOUVER 2015 2 | P a g e 2/23/2017

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 …

34 ft x 18 ft (EGL) SAG mill, 13 MW • Two 24 ft x 38 ft (EGL) ball mills, 13 MW each • SAB circuit • SAG mill limited • High diorite and skarn feed • Circuit grind ~ 106 μm • Theoretical maximum comminution circuit capacity 3100 t/h (SAG Ecs 4.2 kWh/t) • Flotation circuit capacity limit ~ 2700 t/h • Advanced process control ...

At Lihir Gold Mine in Papua New Guinea, the use of SAG mill weight for process control is additionally complicated by compromised load cells and drifting bearing pressure measurements. The need for an improved method of measuring and controlling volumetric filling led to the recent installation of the Outotec MillSense, a SAG mill toe angle ...

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 process deadtimes, recycle streams, noisy ...

Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG …

The amount of pebbles passing through the grate increases with the angle of the grate. It is imperative to ensure the efficient removal of both slurry and coarse pebbles (critical size) in order to ensure the efficient operation of AG/SAG mills. Elimination of the above mentioned material transport problems will allow the mill to respond truly ...

AG mills (or SAG mills with low ball charges) are often used in single-stage grinding applications. Based on their higher throughput and coarser grind relative to AG mills, it is more common for SAG mills to he used as the …

The running largest SAG mill is more than 13 meters in diameter, the full automatic control of the SAG mill has already been developed and applied, and now it is being gradually accepted and used in gold industry. Technical …

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The SAG Mill is a machine added by Ender IO. It uses Micro Infinity (µI) to grind (or mill) items into their crushed variants, like Ores into Dusts. The SAG Mill has four output slots; recipes can have 1-4 different outputs, with different chances of obtaining those outputs. Uniquely, the SAG Mill can use Grinding Balls made from various materials to increase energy efficiency …

1. SAG mill is the primary tool for grinding. SAG mill is used before the other mills. Ball mill is a secondary, and it is used after the SAG mill. 2. SAG mill breaks the raw material into pieces for the further grinding. Ball mill is …

achieved via conventional SAG grinding and flotation technology. The grinding line at Ok Tedi consists of two SAG mills, each feeding a pair of ball mills. The SAG mills are 9.6 m diameter by 4.3 m long and each have about 6,800 kW installed . MAKAT KATOM, OK TEDI MINING LIMITED; MURRAY WOOD AND MICHAEL SCHAFFER, SGS

Another control the grinding operator can often employ is the number of cyclones in the circuit. By increasing or decreasing the number of cyclones in the circuit the operator can influence the pressure drop across the cyclone. …

An industrial example of its use is for the problem of SAG mill feed rate control, shown in Figure 12, which is notoriously difficult for a PID …

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. Assuming a copper price of 4 USD/lb, ANDRITZ AUTOMATION estimates that BrainWave SAG mill led to an extra 12M USD

1. The SAG mill speed (rpm) 2. The SAG mill power (MW) 3. The SAG mill feed rate (tph) 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 ...

SGSののは、・・のなとして、SAGミル (SMC)をってのをします。. SMCは、JKのされたコストです。. そのなは、さいサイズのや ...

involves replacing the mill charge several times throughout the test. The Bond tests are typically run for a minimum of seven cycles, while the MacPherson and pilot plant tests are operated for about 6-10 hours. The achievement of steady-state is desirable in a grinding test, because harder components may build up over time. For AG/SAG mills,

Supervisory Fuzzy Expert Controller for Sag Mill Grinding Circuits: Sungun Copper. Concentrator. Mehdi Hadizadeh, Akbar Farzanegan, and Mohammad Noaparast. School of Mining, College of ...

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

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Today, autogenous grinding (AG) mills as large as 40-ft in diameter with motor power in excess of 20 MW are being ordered and installed as producers look for higher production and economy of scale in their process …

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 ...

Mining SAG Mill Comminution (SMC) Test. SGS's comminution experts use the SAG Mill Comminution (SMC) test to characterize ore samples, an important first step to grinding circuit design, optimization and production forecasting. The SMC test is an abbreviated, less expensive version of the JK Drop-weight test.

Features. Semi-autogenous Metso Outotec SAG mills, as they are often called, can accomplish the same size reduction work as two or three stages of crushing and screening. Often used in grinding at modern mineral processing plants, SAG mills reduce the material directly to the desired final size or prepare it for the following grinding stages.