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.
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 basic goals of SAG mill control using these new signals is to increase and stabilize the throughput of material through the mill to cut specific energy consumption and extend liner life. This is accomplished by performing the following steps: 1.
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 new practice of applying full pre-crushing of SAG mill feed to substantially increase ... Alternatives that provide sound mineral processing routes, provide on-line mill control and are
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.
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 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.
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 …
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 ...
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.
The modeling and simulation of semiautogenous (SAG) mills have been widely used in the design and optimization of mill performance in terms of its power draw, processing capacity and product size distribution. However, these models are solved under steady approximation and do not provide any information on mill charge distribution in real time. This …
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,
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.
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 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.
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 ...
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 load movement inside of a SAG mill can be ... for mill control. By maintaining the critical impact rate in a low to nil value, the best instantaneous load movement ... total mill volume may be determined through the use of mill noise (see Figure 14), process data and software based on appropriate algorithms. This method of determining mill
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 &...
• 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 ...
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.
SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
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
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 …
The Manta Cube ® system can be used to control various processing units and has been successfully used for SAG Mill Control, Ball Mill Control, Flotation Control, Thickener Control, CCD Control and more.
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 ...
SAG mill. SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also 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' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor.
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.
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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