Abstract:Viscosity is a measure of the fluid viscous behavior, and represents the flow force for the internal friction. The viscosity has important effects on the fluid flow and the momentum transfer process. It influences not only the fluid Reynolds number (Re), capillary number (Ca), Dean number (De), Schmidt number (Sc), velocity distribution in the pipeline, flow calculation and estimation, but also the momentum transfer for the calculation of viscous momentum flux. In this study, the viscosity of organic phases constituted by extractant P204 and P507 in kerosene commonly in hydrometallurgical extraction process was studied. The effects of P204 and P507 extractant concentration, saponification rate of extractant on the viscosity of the organic phases were investigated. The results showed that viscosity increased with the increase of saponification rate of extractant under the same extractant concentration. Moreover, the higher the concentration of extractant was, the viscosity of extractant was higher. As increasing the concentration and saponification ratio of the extractant, the increase of viscosity was not favorable for the fluid flow.