
Advanced Controller for Grinding Mills: Results from a ...
MILL CONTROL: BALL MILL CONTROL EXAMPLE Process Description The copper concentrator in Pinto Valley, Arizona processes a 0.4% grade copper ore from a nearby open pit mine. The unit operations consisting of crushing, grinding, and flotation process about 65,000 tons of ore per day in six overflow ball mills.
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Throughput optimisation in milling circuits
This strategy will ensure significant increases in throughput, typically anywhere from 5% to 16% has been observed. Each milling circuit is unique, and as such the goals and most optimal control strategy might differ for individual cases. Process IQ is an expert in implementing control systems for SAG and Ball milling circuits, making use of ...
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Modification of production throughput of ball mill ...
There are 3 ball mills in our plant so we should differentiate between ball mill power and total power of ball mills which is sum of each ball mills power. By increasing throughput the mill power will increase too but it will also let us to send one of ball mills as a standby so total power seems to
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MILLING CONTROL OPTIMISATION
Mill Throughput Mill Load Mass Flow to Flotation (t/h) Average t/h miled Std Dev Minimum Maximum Std Dev Std Dev 7.21 0.627 3.91 0.363 42 42. Comparison of Plant vs MillStar Mill Feed Control Feed Rate (t/h) % of Total Data Points. MillStar OFF MillStar ON 100 200 300 400 500 0 5 10 15 20 25 30 35. 299t/h 318t/h. 40 45. MillStar OFF Power(kW ...
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Grinding Mill Control Types  Grinding Classification ...
The first 40ft SAG Mill in Cadia used sound to control the ball feed utilised this in the control room the control computer. It's old technology. (unknown) 5 years ago (unknown) ... Typically, the mill throughput will increase between 6 and 9%, if you have a variable speed mill. Liners are often designed with this in mind. The trend in mill ...
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Throughput and product quality control for a grinding mill ...
The control architecture aims to achieve independent control of circuit throughput and product quality, and consists of a nonlinear model predictive controller for grinding mill circuit control, and a dynamic inversion controller to control the fast sump dynamics.
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Grinding control strategy on the conventional milling ...
the control loop will attempt to add water to Cyclone 1 sump to achieve a particle size of 15%+ 300 µm. If the hardness of the ore increases, the particle size in the mill discharge from ball mill 1 will increase. With the same water addition to sump 1 the particle size of Cyclone 1 overflow will increase. This will decrease the ratio, and hence
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Optimization of mill performance by using
Optimization of mill performance by using online ball and pulp measurements by B. Clermont* and B. de Haas* Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator. Comminution is responsible for 50% of the total mineral processing cost. In today’s global markets, expanding mining groups are trying
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Meadowbank Mine Process Plant Throughput Increase
The SAG mill (7.925 m . diam. x 3.734 m . long / 3,650 KW ) operates together with a ball mill 5.486 m diam. x 8.839 m long / 4,474 KW ) to reduce the ore to about 80% passing 60 µm to 85 µm, depending on the ore type and its hardness. The ball mill operates in closed circuit with cyclones. About
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VALIDATION OF A CLOSED CIRCUIT BALL MILL MODEL Alex ...
classification efficiency limits the throughput benefits of circulating load. Figure 2. Effect of circulating load and classification efficiency on milling circuit capacity [10] 2. Mathematical model ¨ The grinding kinetics in the ball mill follows first order grinding law which states
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Mill Speed Control Using Programmable Logic Controllers
A ball mill grinds material by rotating a cylinder with ... After the start button is pressed, the mill is load with throughput, from the feed bin. After a time, the filling level, from mill, reach at his optimum value. ... for control the mill speed. Fig. 7. Step 7 Programming Fig. 8. PID Controller Block in Step 7
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Model Predictive Control  Rockwell Automation
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. The solution automatically controls ore master feed rate and water addition to increase throughput, while keeping mill load within
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Throughput and product quality control for a grinding mill ...
The control architecture aims to achieve independent control of circuit throughput and product quality, and consists of a nonlinear model predictive controller for grinding mill circuit control, and a dynamic inversion controller to control the fast sump dynamics.
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BATU HIJAU MILL THROUGHPUT OPTIMIZATION: MILLING
• SAG Mill Limited: the overall grinding circuit is constrained by the SAG mill and the Ball Mill and Pebble Crusher circuits have spare capacity. During these periods the throughput can be as high as 6,000 tph to 7,500 tph for both grinding lines. • Ball Mill Limited: the overall grinding circuit is constrained by the Ball Mill capacity ...
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The Effect of the Grinding Charge Trajectory on the ...
– The implementation of expert control system 4 On the other hand, ... Ball Mill Stirred Mills HPGR 20 – 5 5 – 0.2 0.2 – 0.001 20 – 1 7 5 1.5 ... controlling parameter for the mill throughput. The Effect of the Mill Power on the Throughput 8200 8300 8400 8500 8600 8700 8800
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Meadowbank Mine Process Plant Throughput Increase
The SAG mill (7.925 m . diam. x 3.734 m . long / 3,650 KW ) operates together with a ball mill 5.486 m diam. x 8.839 m long / 4,474 KW ) to reduce the ore to about 80% passing 60 µm to 85 µm, depending on the ore type and its hardness. The ball mill operates in closed circuit with cyclones. About
Read More

VALIDATION OF A CLOSED CIRCUIT BALL MILL MODEL Alex ...
classification efficiency limits the throughput benefits of circulating load. Figure 2. Effect of circulating load and classification efficiency on milling circuit capacity [10] 2. Mathematical model ¨ The grinding kinetics in the ball mill follows first order grinding law which states
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AUTOMATION ADVANCED CONTROL EXPERT (ACE)
Ball Mill ACE CONTROL OBJECTIVES • Control the pressure and solids percentage in the hydrocyclones ... tegy has improved mill throughput by 5.9%, reduced feed variability by 5.6%, and reduced energy consumption per tonne by 5.4%. Once BrainWave was installed, the improvement was
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Advanced process control for the cement industry
Optimization control The ball mill application automatically adjusts fresh feed, depending on desired blaine or fineness. This ensures that the best throughput and quality is maintained for a given recipe. Upset control In the event of mill jamming, the application will
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Process optimization using real time tracking of coarse ...
Jun 01, 2015 silver. Rio Tinto Kennecott’s concentrator is a SAG mill, ball mill and pebble crushing (SABC) circuit with four grinding lines to treat an average throughput of approximately 168 kt/d. Wemco mechanically agitated cells are used for rougherscavenger
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Artificial intelligence applied to mill ...  Control Eng
Feb 10, 2021 The grinding mill is one of the largest pieces of equipment used in the mining and minerals industries, and artificial intelligence has been applied to help advanced process control increase throughput 1% and decrease variability for millions of dollars in annual impact for the mine. Grinding mills often pulverize hard ores and as a result, is ...
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(PDF) Maximising SAG mill throughput at Porgera gold mine ...
Mill consistent with survey #2 exhibiting a finer SAG mill product (smaller throughput with a pebble crusher running would have been between 631 transfer size) to the ball milling circuit than survey #1 (See Figure 6). and 935 dmtph for the feed size distribution achieved by this blast design.
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Ball Mill Circuit Operation, Simulation, Optimisation and ...
Ball Mill Operation and Control with Cement Mill Example. Constant Blaine vs. Constant Strength Control Concept Integrated with PSD to Maximise Throughput. Lecture 4Recycle Load Estimation in ClosedCircuit Grinding Systems. Inherent Inconsistencies, Method to Overcome and Use of CLASANAL Software. Industrial Case Studies.
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Control Philosophy For A Ball Mill
Control Philosophy For A Ball Mill. The ball mill is key equipment in grinding industry, especially in mineral ore dressing plants. It is widely used for the cement, the silicate product, new type building material, fireproof material, chemical fertilizer, black and
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Model based supervisory control of a ball mill grinding ...
Jun 01, 1999 The control objective in ball mill control can be stated as maximizing the throughput subject to maintaining the product size within an allowable range. In such a control system the throughput is a controlled variable to be maximized and the product size is a controlled variable to be maintained within constraints.
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Control of ball mill grinding circuit using model ...
Apr 01, 2005 The laboratory grinding circuit consists of an overflow type ball mill (30 cm × 30 cm), a sump fitted with a variable speed pump and a hydrocyclone classifier (30 mm).The schematic diagram of the circuit is shown in Fig. 1.There are two local controllers that form part of the process: Sump level is maintained constant by a variable speed pump and the percent solids in the mill is controlled ...
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Mill Speed Control Using Programmable Logic Controllers
A ball mill grinds material by rotating a cylinder with ... After the start button is pressed, the mill is load with throughput, from the feed bin. After a time, the filling level, from mill, reach at his optimum value. ... for control the mill speed. Fig. 7. Step 7 Programming Fig. 8. PID Controller Block in Step 7
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Optimal control of a ball mill grinding circuit—II ...
Jan 01, 1991 During these step changes the feed rate to the circuit was 136 kg/h, the circulating load 545 kg/h, the sump water rate 900 kg/h and the product size 70% passing 44 pm. Optimal control of a ball mill grinding circuit II 873 Feedback control The first task in this type of control application is the pairing of controlled and manipulated variables.
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Throughput and product quality control for a grinding mill ...
The control architecture aims to achieve independent control of circuit throughput and product quality, and consists of a nonlinear model predictive controller for grinding mill circuit control, and a dynamic inversion controller to control the fast sump dynamics.
Read More

BATU HIJAU MILL THROUGHPUT OPTIMIZATION: MILLING
• SAG Mill Limited: the overall grinding circuit is constrained by the SAG mill and the Ball Mill and Pebble Crusher circuits have spare capacity. During these periods the throughput can be as high as 6,000 tph to 7,500 tph for both grinding lines. • Ball Mill Limited: the overall grinding circuit is constrained by the Ball Mill capacity ...
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ball mill advanced control
The controller stabilized the mill operation and resulted in a 4.18% throughput increase in ground ore that is finer than the desirable size. INTRODUCTION . Read More ball mill advanced control  Pest Control Cape Town ... ball mill advanced control  coalcrusher.net. Ball mill is equipped with advanced control system.
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AUTOMATION ADVANCED CONTROL EXPERT (ACE)
Ball Mill ACE CONTROL OBJECTIVES • Control the pressure and solids percentage in the hydrocyclones ... tegy has improved mill throughput by 5.9%, reduced feed variability by 5.6%, and reduced energy consumption per tonne by 5.4%. Once BrainWave was installed, the improvement was
Read More

Meadowbank Mine Process Plant Throughput Increase
The SAG mill (7.925 m . diam. x 3.734 m . long / 3,650 KW ) operates together with a ball mill 5.486 m diam. x 8.839 m long / 4,474 KW ) to reduce the ore to about 80% passing 60 µm to 85 µm, depending on the ore type and its hardness. The ball mill operates in closed circuit with cyclones. About
Read More

Process optimization using real time tracking of coarse ...
Jun 01, 2015 silver. Rio Tinto Kennecott’s concentrator is a SAG mill, ball mill and pebble crushing (SABC) circuit with four grinding lines to treat an average throughput of approximately 168 kt/d. Wemco mechanically agitated cells are used for rougherscavenger
Read More

Modelling SAG milling power and specific energy ...
ness of the models. For a given mill to have a combination of feed size, ball load, mill speed and % solids will represent the total load. Ball Mill SAG Mill Scw Jb Pc % 6" +1" N/Nc Fresh Feed Water Water Pebble Crusher Screen Cyclones Sump Pump Fig. 1. SABC A/B milling circuit.
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US3960330A  Method for maximizing throughput in an ore ...
A system for optimizing ore throughput in an ore mill grinding system comprising means for direct weighing of the grinding system including the drive means, means for weighing the new ore input, and controller means regulating the new ore input to achieve maximum efficiency of ore grinding utilizing heuristic problem solving method which also prevents grinding system overload while permitting ...
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AMIT 135: Lesson 7 Ball Mills Circuits – Mining Mill ...
Describe the components of ball mill. Explain their understanding of ball mill operation. Explain the role of critical speed and power draw in design and process control. Recognize important considerations in ball mill selection. Reading Lecture. In ball mills, steel balls or hard pebbles to break particle based on impact and attrition.
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Optimization of SAG Mill Process Control at the Raglan Mine
Jan 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 stage.Many control strategies were used at the SAG over the past few years. Fuzzy Logic was first used in 2007 in order to control
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