FULL PRE-CRUSH TO SAG MILLS
Alternatives that provide sound mineral processing routes, provide on-line mill control and are markedly cheaper to operate are presented as a potentially more viable and sensible route for both ...
electroinc ear system for mill grinding
Sag Mill Grinding Ball Automation. Electronic Ear In Sag Mill Automation Control . 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 …
Multivariable Model Predictive Control of a Simulated SAG plant
Control systems for SAG mills are normally based in expert control systems using empirical rules designed for each plant, that try to keep the process working in a safe operational condition while maximizing the throughput operating against the constraint (Broussaud and Valdebenito 2001). ... (Mill torque, Mill sound model, Ball charging rate ...
The impactmeter, a new instrument for monitoring and avoiding …
The application of this concept represents a change and a step forward in SAG mill control philosophy. Current operating practice is based mainly on maintaining the mill bearing pressure and power between desired levels, by adjusting the feed rate. ... Fig. 4. A typical signal describing an impact in the SAG mill sound. (relative magnitudes). 4 ...
Grinding Mill Control
In one 36 ft SAG we used load cells for weight control (to adjust speed), with feed rate control and power control were used in conduction with the speed control. Worked …
SAG Mill Grinding Circuit Design
Single stage AG/SAG milling. AG/SAG mills as a primary grinding stage in a circuit with or without additional stages of comminution. Inclusion of pebble-crushing circuits in the AG/SAG circuit. Circuits above, but with feed preparation including two stages of crushing—typically referenced as pre-crushing.
Mill Speed
According to available literature, the operating speeds of AG mills are much higher than conventional tumbling mills and are in the range of 80–85% of the critical speed. SAG mills of comparable size but containing say 10% ball charge (in addition to the rocks), normally, operate between 70 and 75% of the critical speed.
BrainWave SAG mill
The solution for increasing production in the SAG mill Control stabilization with BrainWave ANDRITZ BrainWave is a patented advanced controller that outperforms traditional …
Acoustic emissions monitoring of SAG mill performance
The current investigation monitors vibrations in a SAG mill by an accelerometer attached to the outside of the rotating shell. Vibrations are interpreted in terms of the internal state …
Electronic ear in SAG mill | Automation & Control Engineering …
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 ...
Minerals
With MILLMASTER KIMA Process Control offers the most robust, open and easy to handle Advanced Control System for the Minerals Industry. Since 1996 this 'Auto-Pilot' system was installed in hundreds of plants to operate mills fully autonomously. The rule-based expert system for SAG, Ball Mills, VRM's and also combined systems secures a ...
AUTOMATION ADVANCED CONTROL EXPERT (ACE)
The Advanced Control Expert (ACE)®* is a virtual "expert operator" that works in conjunction with ANDRITZ's BrainWave®* solution to fully optimize a process. ACE …
Acoustic emissions monitoring of SAG mill performance
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 ...
SAG Mill Success—Start with the Basics
The SAGDESIGN test is performed with a specially designed laboratory SAG mill and uses 7- to 9-kg (depending on ore specific gravity) of –38 mm ore. The SAG product is then used as feed to a Bond ball mill work index test. The results can be used to determine or confirm SAG (or AG) and ball mill energy requirements.
Integrated advanced process control with a sag mill monitor …
(EGL) SAG mill driven by a 24,000 kW gearless drive. The SAG mill feeds two FL ball mills each 26 ft. in diameter × 40 ft. long (EGL), each driven by a 16,400 kW drive. The SAG mill is one of the largest volumetric capacity SAG mills in the world and represented the first 40 ft. SAG mill in Peru (Garcia & Villanueva, 2013 [1]).
Performance enhancement tools for grinding mills
In recognition of ore variability, many current SAG mills are installed with variable speed drives, capable of operating the mill through a wide and continuous range of speed values. Mill speed and liner profile determine grinding media trajectories, as shown in Figure 1. By increasing mill speed or the steepness of liner attack angle,
Optimization of the SAG Grinding Process Using Statistical …
2. Background. The SAG grinding process has been modeled by various authors, either generating explanatory models of the grinding process, with the aim of modeling, simulating, and optimizing the individual process, as well as integrating it into aggregate processes, such as the mine-to-mill (M2M) paradigm, a practice that has …
SAG mill liner specifications | Download Table
Alternatives that provide sound mineral processing routes, provide on-line mill control and are markedly cheaper to operate are presented as a potentially more viable and sensible route for both ...
Control SAG Mill sound detection
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 …
FULL PRE-CRUSH TO SAG MILLS – THE CASE FOR …
Alternatives that provide sound mineral processing routes, provide on-line mill control and are ... SAG mills respond well to a bi-modal feed, as reported in the work of Putland, Siddall and ...
Energies | Free Full-Text | Operation Analysis of a SAG Mill under
As one of the machines widely used in mining, a semi-autogenous grinding (SAG) mill can significantly improve the roughing efficiency of rock. But the SAG mill still faces the obstacles of significant energy consumption and empirical operation parameters. In order to obtain the optimal operation parameters of a SAG mill, in this paper, the …
Mill scanner Charge Detection Sensor
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 ...
Minerals | Free Full-Text | An LSTM Approach for SAG Mill
The LSTM network shows great results on predicting the relative operational hardness at 30 min time support. On SAG mill 1, using a lambda value of 0.5, the obtained accuracy was 77.3% while increasing the lambda to 1.5 led to an increase in accuracy of 93.1%. Similar results were found on the second SAG mill.
BrainWave: Control solutions for SAG mills
SAG mill #1 load control Plant staff, after extended testing and rigourous data analysis, determined that BrainWave reduced load variability by 14% while increasing production by 1.5%. This was a great success for everyone involved. Assuming a copper price of 4 USD/lb, ANDRITZ AUTOMATION estimates that BrainWave SAG mill led to an extra 12M USD
SAG Mill Response to Changes in Feed Size as Stockpile
In the regard of particle size distribution, the amount of materials coarser than 200 mm in the feed of a full-scale AG mill was increased by direct addition large lumps of ore (200-500 mm ...
Measuring SAG Mill Charge and the Increased Benefits of
Power, sound, and bearing pressure are all proxies used to predict the current volumetric fill of the mill. When trying to increase throughput and maintain stable operation, running a mill at peak ...