Measurements

Photos from Fairbanks Gold mining, Inc.     slurry measurements                            The four measurements selected to model cyclone performance.
                    1) Cyclone slurry feed flow rate  average gallons / minute for two minute         intervals
                     2) Cyclone slurry density  average SG for two minute intervals
                     3) Fresh ore to mill feed rate   average tons / minute for two minute intervals
                      4) Particle analyzer values at two minute intervals                                                                               

This picture shows the 24 inch diameter pipe feeding the underside of  one cyclone cluster. The blue pipe section is an electro-magnetic flow tube which measures flow velocity. Above the flow tube is an nuclear density meter. The lead source holder is mounted on the right side and the scintillator detector is in the oppositely mounted tube.




magmeter schematic Principle of operation of a "magmeter": Faraday's Law is applied in the flow meter. The liquid is the conductor which has a "length equivalent" to the inside diameter of the flow meter. The liquid conductor moves with an average velocity through the magnetic field. The induced voltage is detected by two opposite facing electrodes mounted perpendicular to the field and the conductor. An increase in the flow rate of the liquid will cause an instantaneous voltage rise. The voltage signal produced on the electrodes is linearly proportional to fluid velocity and given the inside diameter of the meter, is converted by the signal transducer into a volumetric flow rate.





                                                                                                            


transmitters                                                                             Low level voltage signals are sent from the pipe mounted sensors to these signal conditioner / local display units. The value of the signal in  flow and density engineering units are continuously updated on the digital displays and also
retransmitted to a central computer data base.

                                                                                                                                






analyzer






The particle analyzer is revived and placed in service for
one month to collect model target data - the output values
used to train, calibrate and validate the model performance. The unit is left in service for a short period and the virtual analyzer and
hardwired analyzer are operated simultaneously. This validates model performance.




Cyclone  Physics             Neural  Networks         Main Page       The Model          Appendix