The innovative way to hear your grind.
An impactmeter measures the impacts of steel balls against the SAG mill liners, as well as ball-to-ball impacts and classifies them into critical impacts or standard impacts based on the intensity of each impact.
ImpactFinder is a field device that can be directly integrated to the plant DCS through any industrial network, and with a processing capacity to incorporate phenomenological models to estimate ball trajectory and internal mill load accommodation, functionalities that were not available as standard on the impactometers available on the market at that time.
System Architecture
ImpactFinder (IF) uses two industrial microphones, one on the loading foot side, where impacts are counted and classified, and one more on the loading shoulder side, with which the fill level is estimated.
Both signals are connected to the IF electronics for signal processing and are sent to the DCS through industrial Ethernet / IP communication, Profibus DP, Modbus TCP. The IF electronics is also connected via Ethernet / IP to the computer with the Advanced Visualization HMI proprietary of the system.
System Installation
In the image you can see the installation of the microphones, these must be installed at a distance between 35-45 cm from the mill hull and an angle of 35°.
We can also observe the control panel of the system, which must be at a distance no greater than 300 ft from the location of the microphones.
Modules
Sound level
It shows the trend of the magnitude of the sound in decibels (dB), which functions as an indicator of the mill fill level trends.
Impact module
It classifies impacts through the configuration of two levels of intensity, with all those low levels classified as standard impacts and high levels classified as critical impacts.
Fill level
It performs a measurement of the percentage of the internal filling with respect to the total volume of the mill, taking into account the variation of the apparent internal density. The display shows graphically the real-time status of the percentage fill level.
Cascade and loading angle module
It allows determining the exact point where the ore waterfall collides, as well as the angle of the load arrangement due to the mill’s turning speed. This module integrates an analytical model which is fed by process variables such as the pressure value of the mill bearings, mechanical dimensions of elevators, mill speed, among others, for the self-calibration of the measurement.
Innovations at ImpactFinder
What is the main comparative advantage of ImpactFinder versus traditional impactmeters?
The main competitive advantage is the incremental innovation that we keep on the product:
System Maintenance
Increasing the availability of microphones is one of the challenges that impactmeter manufacturers have. Although the microphone we currently use is IP 67 (dust protection and submersible one meter in water for up to 30 minutes) it requires maintenance every 6 months and a recalibration for system gain adjustments on an annual basis.
Advanced Visualization
The system has a proprietary interface for advanced visualization, in which an image of the SAG mill with the trajectory of the ball and the load arrangement is shown in the center, in addition to the four calculation modules of the system:
Advanced visualization was incorporated into the equipment to cover the limitation that the DCS HMIs have in being able to display the trajectory of the ball and the load arrangement. The 4 calculation modules with the process variables that are measured, which are integrated by the industrial network to the DCS and which are displayed in this HMI.
Installed base
Mill Features
Diameter 22 ft.
Length 7 ft.
Capacity 180 tph
Internal load 25-38 tons
Motor 1,300 kW
Control system Rockwell
Mill Features
Diameter 28 ft.
Length 11 ft.
Capacity 370 tph
Internal load 110-130 tons
Motor 2,900 kW
Control system Delta V
Mill Features
Diameter 20 ft.
Length 9 ft.
Capacity 170 tph
Internal load 20-33 tons
Motor 1,300 kW
Control system Foxboro
Mill Features
Diameter 40 ft.
Length 29 ft.
Capacity 6,667 tph
Internal load 6,200-7,200 kPa
Motor 20,500 kW
Control system ABB
Minera PenmontUnidad: “La Herradura”
Mill Features
Diameter 30 ft.
Length 12.6 ft.
Capacity 650 tph
Internal load 250-300 tons
Motor 7,500 kW
Control system Rockwell
Mill Features
Diameter 28 ft.
Length 12 ft.
Capacity 550 tph
Motor 5,800 kW
Control system Rockwell
Mill Features
Diameter 20 ft.
Length 13 ft.
Capacity 203 tph
Internal load 580-680 psi
Motor 2,000 kW
