PDF) Real-Time Simulation and Control of a SAG Mill

The simulator implements the dynamic ball mill grinding model which formulates the dynamic responses of the process variables and the product particle size distribution to disturbances and control ...

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SAGMILLING.COM .:. Articles

Correction of Bond Ball Mill Work Index Test for Closing Mesh Sizes It is commonly known that one must run the Bond ball mill work index test such you pick a closing mesh to give a P80 close to desired grind size.

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Optimum SAG Mill Discharge Density - Grinding

To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN Use Add New Topic to ask a New Question/Discussion about Grinding. OR Select a Topic that Interests you. Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent). Using Add Reply allows you to Attach Images or PDF files and provide a more complete input. Use Add Comment = to comment on someone else's ...

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Autogenous and Semi-Autogenous Mills

Semi-autogenous grinding uses a minimal ball charge in the range of 6-15% while autogenous grinding uses ore only. 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.

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SAG mill Archives - International Mining

The contract includes delivery of one SAG mill and two ball mills with a total installed power of 36 MW, as well as two HP series pebble crushers. Outotec will also supply spare parts and consumables, including metallic mill liners, and will supervise the installation of the equipment. The delivery is scheduled for 2022.

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Power-based modelling of single-stage AG and SAG mill circuits

WiBM is the Bond ball mill work index, unitless CFnet is an empirical adjustment to a ball mill circuit [CFnet = 2.35 - 0.29 × ln(P80)] Morrell Mi model: Morrell (2008) published a two-parameter model based on two equations (3 & 4) to describe a variety of comminution devices, including single-stage SAG and AG mills. The CEE

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Ball Mills - an overview | ScienceDirect Topics

Oleg D. Neikov, in Handbook of Non-Ferrous Metal Powders, 2009 Tumbling Ball Mills. Tumbling ball mills or ball mills are most widely used in both wet and dry systems, in batch and continuous operations, and on a small and large scale.. Grinding elements in ball mills travel at different velocities. Therefore, collision force, direction and kinetic energy between two or more …

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Gearless mill drives - Grinding | ABB

ABB’s GMD is the most powerful mill drive system in the market to power semiautogenous (SAG), ball and autogenous (AG) mills, This ’workhorse’ for grinding operations combines a robust, service-friendly and fit for purpose design to provide highest throughput, reliability and availability for your processing plant.

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Taking Control of the Mill Feed R2 - Metallurgy

The 8.53 m Ø x 3.92 m EGL (28 x 12.8-ft) SAG mill is fitted with two 1850 kW motors. An operating ball charge in the range of 4 to 10% is used. The mill currently operates at a fixed speed of 72.5% of critical, however it has variable speed capability through the use of the liquid resistance starter.

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AG Mill and SAG Mill - ball mills supplier

In general, the SAG mill manufacturers will control the addition amount of medium such as steel ball at 2-8%, so that the capacity of semi SAG mill to process materials can be increased by 10-30%. The SAG mill liners wear will increase by 15% due to the impact of medium such as steel ball during the SAG mill operation.

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Expert mill control at AngloGold Ashanti

and the broader holistic approach to mill control are discussed. 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

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Electronic ear in SAG mill | Automation & Control

Aug 25, 2004 · We use electronic ears here on Sag mills. The signal is converted to 4-20 and goes into the PLC and is transfered to the DCS and Expert Control system. The sound is used to check that the balls are hitting material and not the liners.

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sag and ball mill controls - Ristorante «La Perla

Ball Mills Controls. Sag ball controls sag and mill controls 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 in diameter powered by. 【service online】 AUTOMATION ADVANCED CONTROL EXPERT (ACE)

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PDF Paper # 25 - Copper Mountain Overview on the Grinding

The SAG and ball mills at Copper Mountain are the low speed version, i.e. the motors are connected directly to the pinion without a gearbox in between (the picture on the right hand side of Figure 5). Figure 7 shows one of the synchronous motors installed on Ball Mill 1. 10 Figure 7 - ABB synchronous motor on Ball Mill 1

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Grindin' at the Mill - investigating bottleneck in

The main problem with these harder ore types is that they hold up in the SAG mills, restricting throughput. The SAG mill feed is controlled by the mill weight, measured by 4 load cells on the mill bearing system. Therefore if the ore does not grind quickly enough in the SAG mills, the mill weight increases and the control system reduces feed to the mill to maintain the desired mill …

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Sag And Ball Mills | Crusher Mills, Cone Crusher, Jaw Crushers

SAG is an acronym for Semi-Autogenous Grinding, which means that it utilizes steel balls in addition to large rocks for grinding. The SAG mills use a minimal ball … SAG Mill Balls - Sino Grinding Industries Sino-1 Balls: Sino-1 balls were designed for Ø125mm (5") balls operating in +10m (33') SAG mills.

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PDF 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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Evolution of SAG Mill Process Control at the Xstrata

SAG Mill 24’ diameter (2240 kW) Variable Speed Double Deck Vibrating Screen (8’ x 16’) Cone Crusher Hydrocone H4800 (250 kW) ASRi Gap Control 6 x 15” Krebs GMAX Cyclones Ball Mill 14’ dia. x 21’ (2240 kW) Flotation Underground Storage Bins A B WipFrag Feed Size Measurement Impactmeter

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Ball Mill Simulation and Analysis on Vimeo

Optimize your SAG Mill operation using EDEM tools for analyzing the motion of rocks and balls, power consumption, wear and ball particle distribution through time. Use EDEM Analyst features and export simulation results to help predict and control the performance of SAG Mills.

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AMIT 135: Lesson 6 Grinding Circuit - Mining Mill Operator

AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit.

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Unlock SAG mill capacity with process control optimization

The traditional operation of SAG mills relies on the operator to adjust the manipulated variables to maintain the target mill load and power draw. Changes to the ore hardness, feed size or ore specific gravity require an alert operator to adjust the variables while keeping up with all the other demands in the plant.

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Ball Mill - an overview | ScienceDirect Topics

The ball mill accepts the SAG or AG mill product. Ball mills give a controlled final grind and produce flotation feed of a uniform size. Ball mills tumble iron or steel balls with the ore. The balls are initially 5–10 cm diameter but gradually wear away as grinding of the ore proceeds. The feed to ball mills (dry basis) is typically 75 vol.-% ore and 25% steel.

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Difference Between Sag Mill vs Ball Mill - mech4study

Oct 12, 2017 · Ball mill is a fine grinder. A horizontal or vertical rotating cylinder which is filled partially with the balls of ceramics, small rocks and balls made from stainless steel. The ball charge of a SAG mill is about 29% to 30%. By friction and influence of tumbling balls inside rotating cylinder grinds the raw material to the required fineness.

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Advanced Controller for Grinding Mills: Results from a

Recent application of the multivariable control techniques for grinding has shown significant improvement in process stability with a strong return on investment for throughput-limited ball mills and Semi-autogenous grinding (SAG) mills.

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PDF Automation Advanced Control Expert (Ace

Ball Mill ACE CONTROL OBJECTIVES • Control the pressure and solids percentage in the hydrocyclones ... concentrator site in order to tightly control the weight in the SAG mill to promote optimum grinding. This stra-tegy has improved mill throughput by 5.9%, reduced feed

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mode of operation of sag and ball mills

Model Predictive Control for SAG Milling in Minerals Processing. SAG and ball mills are generally accepted as the largest power consumers in a mining ... mineral processing operation and can be 80% of total electrical energy... Read more

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Sino Grinding | About

SGI leads the market with technical design and quality control of SAG and ball mill grinding media production. Our approach is to work with customers to improve performance by: Decreasing steel consumption, Decreasing cost per tonne of ore milled, Improving grind (particle distribution), and; Increasing throughput. See more on our PRODUCTS page.

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MOLYCOP ENGINEERED - Molycop

Molycop Engineered designs and manufacturers a range of SAG and Ball mill liner bolts for the mining and mineral processing industry. Manufactured from carbon alloy steel, we customize our bolts to satisfy our customer requirements. Molycop Engineered controls the end-to-end process for this product range.

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Grinding in Ball Mills: Modeling and Process Control

Keywords: Ball mills, grinding circuit, process control. I. Introduction Grinding in ball mills is an important technological process applied to reduce the size of particles which may have different nature and a wide diversity of physical, mechanical and chemical characteristics. Typical examples are the various ores, minerals, limestone, etc ...

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ball mill advanced control

Stable control of particle size in ball mill grinding circuits is of great importance for the recovery of the valuable minerals, and the maximization of mill ca Get Price Here! Digital Control Lab - AG, SAG, Ball Mill Optimization and ...

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What is the difference between a SAG mill and ball mill?

A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. [6] [7] The largest SAG mill is 42′ (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. [8] A SAG mill with a 44′ (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. [9]

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Throughput optimisation in milling circuits

SAG mill discharge control is quite involved due to few interactive variables, such as mill discharge sump level, classification hydro-cyclone variables (feed density, flow and pressure) and water feed rate to the sump. Model predictive control (MPC), which is a multi-input multi-output (MIMO) controller, is very suitable for this purpose. If a particle size analyser is installed it can …

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GrindingExpert™ - WordPress.com

Our SAG mill strategies automatically adjust feed rate, mill speed and water addition to reduce upsets , eliminate grind-outs, protect liners/lifters, and increase tonnage . We maintain desired operating conditions by constantly monitoring bearing pressure, mill power, recycle pebbles, mill density, charge toe and mill acoustics,

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SmartMill - Grinding | ABB

Combine ABB's variable-speed drive system with advanced process control - ABB Ability™ Expert Optimizer for grinding - to provide maximum mill control. It can be applied to new or existing AG, SAG and ball mills, powered by either ring-geared mill drives (RMD) or gearless mill drives (GMD). This solution was designed to control, stabilize and optimize mill operation.

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Starkey & Associates Inc. - Leaders in Comminution Design

SAGDesign testing provides SAG pinion energy grindability in kWh/t to within +/- 5% from 152 to 1.7 mm, and Bond Ball Mill Work Index on SAG ground ore, from the SAG test on the same sample. Starkey & Associates uses the patented SAGDesign technology to calculate accurate mill sizes from measurements on a client’s own ore samples.

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