A comparative analysis of electrochemical cells containing fluidized-bed electrodes (FBEs) is made. The influence of the arrangement of the working space on the manner of particle movement and distribution of polarization inside of the FBE is taken into account. The configuration of the FBE working space is chosen in accordance with the hydrodynamic and electrochemical processes taking place in the FBE. Reactors of high capacity are designed on the basis of the principle of spout fluidization. Some examples of their application in hydrometallurgical processes are shown.