AUC（Ammonium Uranyl tri-Carbonate） was produced in a recirculation MSMPR (Mixed Suspension Mixed Product Removal) crystallizer by reacting uranium solution with ammonia and CO₂, and the start-up dynamics for the precipitation was studied.
Generally kinetic equations determined from the steady state crystal size distribution are used with the population balance equation and the mass balance equation to give the transient characteristics of crystallizers. However, when the secondary nucleation effect is predominant as in this study, the birth function needs to be determined from the start-up data. In this study, using tne growth funcion and the birth function determined from experimental data the transient behavior for the starup of the crystallizer was analyzed and compared with experimental results.