CXR series represents the complex and robust sensor based sorting systems, used for the analysis, identification and sorting of particles based on different physical properties.
The CXR series represents complex and robust sensor-based sorting systems used to analyze, identify and sort particles based on responses from X-ray transmission (XRT) sensors according to differences in particle density of the scanned material.
This makes it possible to identify and separate material defined as product and waste, resulting in increased product quality and reduced feed diverted to further mineral processing.
The CXR series based on XRT sensors and XRF sensors (dual sensor sorting equipment) is operating in dry mode, thus it does not require any use of water / requires pretreatment of the material by particle washing.
The Dual Energy XRT sensors allow precise response in density difference of the analysed samples, successfully able to handle high throughput and dynamics in grain quality and size.
The XRF (X-ray fluorescence) detectors allow determining the elemental chemical composition of the analysed objects.
How does the CXR work?
Feed material is supplied to the vibrating chute, where individual rocks are separated before falling on to the horizontal belt. The rocks are supplied to the X-ray analyzing unit and at the end of the belt they enter the optical analyzer zone. In this area, different optical properties of the particles are analyzed and registered.
Images are taken by the optical camera (line scan camera ) and the X-ray analyzer under dynamic conditions. The system is operated by the control system based on an industrial PC employing a separation algorithm based on selected separation criteria. Each particle can be identified in terms of it’s dimensions, shape and structure, and its position on the conveyor is registered for possible further rejection.
Results from image processing can be displayed as a number of different parameters describing the material properties. In addition to material colour and internal structure, there are over 50 parameters (such as diameter, perimeter, centre of mass, moment of inertia, particle orientation, elongation factor etc.) normally used for particle shape identification. Additional combinations of these parameters can also be used for distinguishing particles of interest. Each particle has a specified position and size so it is possible to use the rejecting mechanism (air nozzles) to separate them from the material stream
The benefits
Generally, the new Comex separation system can provide the following benefits:
- significant reduction of the investment cost
- huge reduction of the plant operating cost
- increased product quality
- reduced waste generation in form of fine particles
- reduced water consumption or its elimination
- reduced environmental impact of mining activities
- re-processing possibilities for mining waste
When used for pre-concentration of ROM material, it will additionally result in:
- removed impurities in the early processing stage
- impurities, being in form of large particles can be used for other purposes like building industry
- reduced transportation cost between a mine and a processing plant
- improved profitability for mining operations
