Monitoring of coal separation in a jig using a radiometric density meter

This paper discusses the application of a radiometric density meter to monitor the coal separation process in a jig. The signal from the meter can be used to evaluate the degree of coal grain loosening during cyclic water pulsations and to determine the separation density in the jig. The signal from the radiation detector is highly variable due to stochastic decay of the radiation source and various changes in media density. The paper shows how to optimize the analogue and discrete filters applied in an electronic circuit of a density meter. The minimum dynamic error of measurement can be achieved if their parameters adapt to changes in the measured density. The authors present results of industrial tests carried out on the jig control system with the radiometric density meter.