study is a SAG mill open circuit composed of an ore feeder, water control v alve, and mill depicted in Figure 2. The SAG mill model is based on …
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Regulatory Control of SAG Mill Grinding Circuits Sound is assumed to be a measure of the breakage conditions at the impact zone Practice and Control Volume 2 . More Info. SAG Mill Optimization using Model Predictive. SAG MILL OPTIMIZATION USING MODEL PREDICTIVE CONTROL WA Gough PEng ANDRITZ AUTOMATION Ltd International Place Suite 100 .
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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 …
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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 ...
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Semi-autogenous grinding (SAG) occurs in tumbling mills which use both large ore particles and steel balls for grinding. Grinding is the most energy intensive mineral processing unit operation and ...
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Features. Semi-autogenous 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.
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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 ...
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Control SAG Mill sound detection. Grinding Classification Circuits, Sound control of a SAG mill is a subject that needs to be talked about more I have been working on mill control, using microphones, for a good part of my career and I can say with much confidence that it works Where I work now, Minera San Cristobal in Bolivia, we use sound ...
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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 ...
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Where I work now, Minera San Cristobal in Bolivia, we use sound control on both the SAG and Ball Mills. The result of this control is a 25% increase in throughput, over the plant design, with a 10% reduction in energy consumption; the mill is more efficient. The mill control manipulates the feed rate and mill speed depending on ore and liner ...
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At Northparkes load is inferred by measuring the sound level (in the correct frequency range) of the tumbling mill charge. It has been found that sound level around 82 to 83 dB's produces ... The SAG mill control was developed using the Function Block Language which is available within the Concept software package. The control strategies have ...
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SAG Mill Sound; SAG Mill Density; Recycle Tonnage;, In the future, if soft or fine ore conditions are restored, we will commission rules to control the SAG mill speed. Live Chat Paper # 25
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It is commonly assumed SAG mill control can only be successfully implemented using "black-box" solutions; this is just not true. Black-box solutions are referring to advanced control algorithms or solutions which are contained in a separate computer, interfaced to the PCS. Another common name is "off-the-shelf" solutions, which is a ...
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S Mill Stabilising Control – Mipac. 1/1/2007 The Century Zinc S mill has been the subject of two major advanced control projects since its commissioning in 1999 Over time, both systems failed to meet the mill's needs and operating staff lost confidence, preferring to operate the mill semiautomatically The first system used expert system technology and failed because of a …
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Control SAG Mill sound detection - Grinding ... Sound control of a SAG mill is a subject that needs to be talked about more. I have been working on mil
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Oct 01, 2014 MIMO control system design based on the MPC strategy for a SAG mill. • Control action exhibit an additional effort in the water as manipulated variable. • The size reduction percentage control is conducted as a cumbersome task. • MIMO controller correctly handled noisy set-points modifications.
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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 ...
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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 …
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Control stabilization for SAG mills. BrainWave is ideally suited to stabilize the operation of SAG mills. Effective grinding in a SAG mill depends largely on how it is loaded. A mill containing too much material does not allow for adequate movement of the ore and balls. A mill that does not contain enough material does not take advantage of the ...
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The answer to the challenge turned out to be a new generation of SAG mill acoustic analyzer, the Manta Mic, which takes advantage of Brüel & Kjær's products for analyzing acoustic emissions. However, it wasn't a straightforward development process. Manta Controls had previously been using a Type 2238 sound level meter.
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
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Control SAG Mill sound detection. I applaud Pueblo Viejo for this work Sound control of a SAG mill is a subject that needs to be talked about more I have been working on mill control using... Know More. Want to control grinding mill feed Automatically.
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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 …
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Additional instrumentation can provide realtime loading information with higher resolution than power/bearing pressure/sound. Specifically, we can measure; the total vibration energy per rotation ...
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To maximize the capacity of these circuits, the general practice is to use grates with pebble ports (reaching 100 mm) instead of normal grate openings to increase the pebble removal. In addition, operating mills at relatively higher speeds has become an option to increase mill capacity. The reasoning is because the higher the mill speed, the ...
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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., & Mainza, A.N. 2009).
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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 …
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