CSIRO Instruments at Multiple Plants

Using the electrical impedance spectrometer (EIS) and sensors to measure the density of the mediums associated with the operation of the Dense Medium Cyclone (DMC) in real time gives the operators a measure of performance stability. As an example, the differential can be measured or the variation in density of the underflow medium monitored as an indicator of surging.

The density differential, together with the correct medium density can be used as input parameters in models to provide a cyclone cut-point (RD50). For multi-loop plants, knowing the cut-points of each of the loops, and thus the density offsets, and adjusting to bring the cut-points closer together can result in considerable yield increases.

The EIS system had only been extensively trialled at a single plant prior to this project. The outcomes of this project shows the results and issues encountered when installing and operating the EIS system at different plants that operate with different processing circuits. The system was redesigned so that it could be mass produced at a low cost and the size of the spectrometer reduced. The spectrometer was also documented and tested for conformity to relevant standards and Board of Professional Engineers, of Queensland compliance was achieved prior to installation.