Learn how to calculate a Volume at different heights using CONTROL X for Sag and Ball Mills using View Clip and Enclosed Volume option.More information at: g...

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 reduced. • The cyclone feed is more stable, allowing for consistent size separation and feed to downstream processes.

Volume Title: 12th Mill Operators' Conference 2014 Semi-autogenous grinding (SAG) mill control is complex and depends on many dynamic process variables. Good control strategies ensure that a mill is operating as close to optimal as possible, resulting in significant economic benefits to an operation.

Waples and Waples (2004). The concentrator has a SAG mill circuit feeding a ball mill circuit. The general specifications of the SAG and ball mills can be found in Table 2. Table 1 - Heat Capacities Table 2 - Mill Data One control volume was defined around the SAG mill circuit and another control volume was defined around the ball mill.

The SAG mill's steel liners were failing to meet the required service life. To remedy the problem, the supplier had added more material to the liner design. But this created its own challenges, reducing the effective grinding volume and adding weight to the mill that was pushing bearing pressures dangerously close to limitations.

Gearless mill drive system (GMD) Go gearless to meet your business objetives by exceeding standard availability targets in your grinding operations. 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 ...

The idea was that we could use sound to see how full the mill was based on the sound emitted by the SAG mill. Ignoring the shortcoming that a sound sensor does not detect charge location, it is ...

The SAG mill at the site grinds the gold ore which is then sent to the autoclave for further processing. The impact of steel balls against ore particles is an efficient grinding method, but it can also wear the liner that protects the cylinder.

SAG Mill Liner Design In summary: A broad range of AG/SAG circuit configurations are in operation. Very large line plants have been designed, constructed, and operated. The circuits have demonstrated reliability, high overall availabilities, streamlined maintenance shutdowns, and efficient operation.

SAG mill control. Then, due to the excellent results obtained, more applications were implemented for other processes along copper concentrators in Chile. Presently, all process operators aim to ...

sump. The Ball mill will operate in closed circuit with a cluster of cyclone classifiers. Provision will be made for a portion of cyclone underflow to be recycled to the SAG mill feed if required. The ultimate capacity of the grinding system is 600 dry tph …

Operating Sawmill with Sound. 2015 Preview. A Classic Lionel Accessory with Command Control! See the logs enter into the sawmill by conveyor belt and watch in amazement as fresh wood planks come out of the other side. Safety strobe lights on both sides warn workers to be careful around the action.

The Manta Controls Advanced Control System, called the SAG Cube, automatically monitors and controls a SAG Mill, keeping track of critical process variables impacting mill throughput. For most sites, one hour of operation provides a revenue between AUD$ 20,000 per hour up to or greater than AUD$ 100,000 per hour.

Therefore the SAG mill speed could not be controlled using the microphone based signal and instead was manually controlled/set by the control room operator. Thus operation/speed of the mill could and would change significantly based on a particular operator running the mill and their overall level of mill operation experience and skill.

Experiences and Lessons with Advanced Control Systems for the SAG Mill Control in Minera Los Pelambres Daniel A. Silva*, Luis A. Tapia** *Senior Control Eng., Automation Department, Minera Los Pelambres, Choapa, Chile (4001 Apoquindo Ave., 18th Floor, Santiago, tel.: +56-2-7983609; e-mail: [email protected]).. **Concentrator Operations …

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 control on both the SAG and Ball Mills.

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 ...

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 controller due to the long dead time. Figure 13 shows the results of on/off testing comparing Dahlin and PID control. Jean Rasczak. 6 years ago. Jean Rasczak 6 years ago.

GrindingExpert™ SAG Mill The GrindingExpert solution will automatically adjust feed rate, mill speed and water addition to reduce upsets, eliminate grind-outs and increase tonnage in SAG / ball mills. Secondary grinding can be optimised as well with automation on cyclones and pumps. This grinding expert solution is an add on to LoadIQ. Benefits

This video shows how to calculate Volume of a SAG Mill using GEOMAGIC DESIGN X in under 6 minutes from start to finish.Alignment: Local Based on Pick Point &...

Figure 8.6. The total volume inside the mill is given by Vm 4 D2 mL 1 2(Lc L) L 1 (Dt/Dm) 3 1 Dt/Dm (8.16) The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill, or large lumps of ore in an autogenous mill or a mixture in a semi-autogenous mill,

According to the authors, through continuous improvement and the use of advanced technologies like SmartEar, Pueblo Viejo—a joint venture between Barrick (60%) and Goldcorp (40%)—is improving the control and operation of its SAG mill, resulting in reduced liner wear, more efficient mill performance and optimized energy consumption. Subscribe

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).

Jx is the mill filling of component x, as a fraction of total mill volume (e.g. 0.3 for 30%) L is the mill effective grinding length, m P is the power evolved at the mill shell, kW wC is the charge %solids, fraction by weight (e.g. 0.80 for 80%) εB is the porosity of the rock and ball bed, as a fraction of total bed volume (e.g. 0.3 for 30%)

The two main variables for controlling the SAG mills are feed and speed. Feed is presently controlled automatically via an expert system that adjusts the amount according to readings taken off of multiple bearing pressure load cells on each mill.

Fuzzy logic control: Equigold Mt Rawdon plant: SAG mill +2.5%: −91%: Meech(2006) Leeudoorn gold mine: Closed SAG mills +10.8%: Van Dyk et al. (2000) OK Tedi Mines: SAG mill: Yes: McCaffery et al. (2003) Process vision, with PID: Doyon Gold Mine: Closed SAG mill, ball mill +1% to +3%: Bourassa et al. (1995) In-house: Xstrata Nickel Raglan ...

The SAG mill was designed to treat 2,065 t h −1 of ore at a ball charge of 8% volume, total filling of 25% volume, and an operating mill speed of 74% of critical. The mill is fitted with 80 mm grates with total grate open area of 7.66 m 2 (Hart et al., 2001).

For SAG Milling, optimizing the throw and converting the available electrical energy (installed motor power) to potential energy (height of throw, trajectory) to kinetic energy (rock breakage) is the key function. Therefore, having a speed range available allows this tuning of the SAG mill.

Listening to SAG Mill Noise Pays Off for Pueblo Viejo. SmartEar technology from Process Technology & Innovation is designed to measure a grinding mill's performance by analyzing its acoustic emissions. SmartEar helps to prevent damage to mill liners caused by the impact of the balls, and provides an estimate of the ball fill level when ...

autogenous (SAG) Mill via an utilized method. Miduk copper concentrator is located in Kerman Province, Iran, and its size reduction stage includes one gyratory crusher which feeds one SAG mill (9.75 dia.(m)*3.88 length(m)) following two parallel …

We 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.

The inferential models could be utilised in a SAG mill load control strategy, as a measure of SAG mill performance, as an indication of the primary grinding circuit operating conditions, or, …

Learn how to calculate a Volume at different heights using CONTROL X for Sag and Ball Mills using View Clip and Enclosed Volume option.More information at: g...

• Prevent premature wear of the mill liners by using a speed control based on sound emissions • Improve energy efficiency • Increase production • Minimize energy consumption • Manage power and torque limits to prevent mill overload SAG MILL CASE STUDIES Location: Minera Centinela Mine • Reduced feed variability by 18% • Increased ...

The required sound level (DB) is entered manually as a set point into the Expert System, the sound of the mill charge motion is measured by 4 microphones adjacent to the SAG Mill shell, and the resulting signal is transmitted to the Expert system which, in turn, sends a set point to the SAG mill tonnage and speed controller.

The Manta Controls Advanced Control System, called the SAG Cube, automatically monitors and controls a SAG Mill, keeping track of critical process variables impacting mill throughput. For most sites, one hour of operation provides a revenue between AUD$ 20,000 per hour up to or greater than AUD$ 100,000 per hour.

The Outotec slurry wheel upgrade is a retrofit sealing solution for the grinding mill feed end. The existing configuration is replaced with a new and improved slurry return system featuring a unique water-wheel design that significantly improves the material containment of the feed ends.

San Diego, California, USA Fuzzy Logic Control On a SAG Mill Michel Ruel Optimization and Advanced Control (Top Control), BBA Inc., Canada CAN (Tel: 418-657-5901; e-mail: [email protected] bba.ca). Abstract: The paper will present a case where fuzzy logic was the logical choice to improve performances of a semi-autogenous grinding (SAG) mill.

Mining - Mine Expo 2016 - Auto Sag Control Presentation; Mining - NA SAG Conf 2015 - Optimal Control Vibration Paper; Mining - NA Sag Con 2015 - Optimal SAG Control Using Vibration Presentation ... Optimal Mill Performance and a Happy Boss. Asanko Gold (Ghana) Record Production Presentation; Barrick Gold Record Production Award ...