Dynamic characteristics of the mixer-settlers: Pt. 1

The main goal of this study is to offer dynamical characteristics for the design of the control system for 1A mixer-settler of Puex process. The dynamic theoretical model of the extractor-cascades given in the paper can predict the dynamic response of the components in the two phases. On the basis of this model, and by adding a PRBS disturbing function to the input aqueous and organic flows, dynamic mathematic simulation can be carried out. Provided that the disturbing signal condition is the same, the error margin between experimental and calculating results is smaller in the organic phase than on the aqueous phase, with an average of about 15% for the former and 20% for the later. The dynamic test has also been carried out in a pilot plant air pulse mixer-settler with a system consisting of UO2(NO3)2 + HNO3 + H2O/TBP 30% + OK, and with PRBS signal produced by computer being added to input parameters, and output parameters being measured continuously via on-line instruments