Increase SAG mill and ball mill tonnage with better efficiency.
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. Our solution utilizes cutting edge smart sensors to analyze incoming ore properties and measure the volumetric load of the grinding mill. Combined with industry leading expert system software that utilizes genetic algorithms, neural networks, and fuzzy logic to constantly maintain desired operating conditions by monitoring bearing pressure, power, recycle pebbles, mill density and mill acoustics, these solutions yield a 3-6% increase in SAG mill throughput over an operator/DCS system. PlantVision™ visually monitors the feed and relays critical information about the properties of, and changes in, the incoming ore. Mill scanner will skillfully listen to the mill to ensure it’s safe, reliable, and efficient operation. KSX will tie all of the information together to create optimal set points from which its neural network and genetic algorithms can continuously, learn, predict and further optimize SAG mill throughput. GrindingExpert™ is a true turnkey solution for optimizing SAG and Ball mill circuits, and our technical abilities implementing it are second-to-none.
The KnowledgeScape adaptive control solutions work together to see, listen, and think about the best way to increase tonnage and optimize SAG and ball mills at all times and for all conditions. Our expert control ball mill strategies automatically adjust sump water and mill water addition, mill speed where available and can open and close cyclones when appropriate. The strategy smooths disturbances and provides optimal particle size in cyclone overflow to flotation.
Many GrindingExpert™ expert control solutions will include our SAG mill scanner Smart Sensor. Using a highly innovative solution that is fixed in rotation with the shell of the SAG mill, mill scanner accurately and continuously monitors a mill’s contents to provide invaluable information regarding charge toe and media angles, liner/steel impact detection, and volumetric loading in realtime. Our mill scanner provides information to KSX via OPC communication, and displays radial trends graphically to the control room operator . Combined with traditional process variables such as bearing pressure, mill power, and recycle pebbles, the data provided by the sensor allows the KSX Expert System to make the best possible expert control decisions, in the least amount of time, for all conditions. Because you are taking control actions based on measured media angles, the time delay in system feedback from feed changes is greatly reduced, which helps increase SAG mill throughput.
The information that Knowledgescape mill scanner provides to KSX ensures that the expert control software is able to effectively optimize SAG mill set points and increase efficiency better than any other system. Control strategies can now factor in volumetric loading, charge toe angles, and steel-to-liner impacts in the decision tree along with bearing pressure, recycle pebbles, and mill power.
Compromising accuracy when selecting an acoustic sensor for your SAG mill will only compromise the integrity of the expert control system for future improvements. Control does not have to be what it was 30 years ago, and with KnowledgeScape leading the way in automated process optimization, higher throughput and increased reliability are now possible. Utilizing a charge sensor results in better grinding, clear vision of the mill contents at all times, reduced steel and power usage, longer liner life, and significantly increased profits. Knowledgescape’s mill scanner is the ultimate tool for increasing SAG mill throughput and reliability.
GrindingExpert™ isn’t just about SAG mills. Our GrindingExpert™ solutions include ball mill strategies that achieve the target grind size while maximizing throughput, or when the circuit is SAG mill limited, achieve the finest grind size possible, thus increasing mineral liberation and recovery.
GrindingExpert™ has been shown to typically increase throughput by 3-6%. Here are some actual results from Los Pelemres, where GrindingExpert was implemented.
Mill Line 1: Note the shift in the curve to the right and the narrowing of the tails. The shift to the right represents the shift in the mean production. The narrowing of the histogram tails is a result of the remarkably smooth operation of the control strategy. Wild feed rate fluctuations are eliminated, resulting in smoother downstream operation. Even though production was dramatically improved, the product size of the secondary ball milling was reduced and recovery increased.
The results in SAG-Mill line 2 are even more dramatic. Because of segregation on the coarse feed stockpile, SAG-mill 2 receives a higher percentage of coarse material. The KnowledgeScape strategy’s ability to maintain smooth and stable operation of the mill was more apparent when contrasted to the DCS control on the “difficult” line.
Note that these histograms represent a combined throughput increase of 13.4 % or roughly 15,000 tons per day. This increase in production resulted in an increase of gross revenue between $55 Million and $78 Million per year! The on/off tests are performed to rigorous standards, and the guidelines for the tests are from the accepted best practices found here.