Studies On The Electrolysis Of Diluent Copper Sulphate Solution In A Fluidized Bed Electrode

Fluidized bed electrode (FBE) combines the fluidization techniques and electrochemical methods. When using FBE to treat waste water with metal ions, the small transfer resistence between the solid and liquid phase and the big interface area lead to a very low concentration polarization and electrochemical polarization, thus the current efficiency and space-time benefit can be highly increased; on the other hand, the absence of added chemicals and the direct recovery of matel will not bring a secondary pollution. So FBE has distinguished advantages and could be widely used in treating waste water with diluent heavy metal ions.In this work, a rectangular fluidized bed with a 50×15mm cross-section has been used to study the fluidized behaviour of the spherical copper particles both in a single size and a binary mixed size after narrow screen separations, with water as a fluidized medium, under room temperature. In the case that copper particles of a single size have been fluidized, linear regression analysis has been carried out based on the Richardson-Zaki function about the bed voidage, and the relative indices have been determined under our experimental conditions particularly. While in the case of the binary mixture, it has been revealed that the bed expansion have gone through three stages: stratification, partically mixing, then complete mixing, and the bed voidage could be well illustrated by the voidage-averaging model.Furthermore, such two sized copper particles have been fluidized in the diluent copper sulphate solutions, so that influences of the particle size, mixing ratio and bed...