This article presents a model of a storage container of linear crystallizer. On the base of this model two independent control system of storage containers filling in a uranyl nitrate crystallization process were suggested. The use of the proposed control systems is necessary for the timely switching of the storage container to an empty one. For the proposed control systems, simulation results are presented in the SimSar software. The developed mathematical model and the control system could be used for optimization process during the design and adjustment of equipment.