Mass Transfer Study inside a Li Producti

A mass transfer study in a lithium production electrolysis cell is carried out to enhance understanding of the processes involved. The objective is to model and analyze the transport mechanisms within the cell using computational fluid dynamics (CFD). A numerical domain, represented as a 2D axis-symmetric wedge of 5 degrees, is filled with an electrolytic solution comprising a eutectic mixture of LiCl and KCl. The methodology involves the simulation of the reduction of lithium ions at the cathode and the oxidation of Cl at the anode, which generates bubbles of chlorine gas that ascend due to their lower density, thereby inducing convection and facilitating ion transport alongside migration and diffusion processes. The results indicate a turbulent two-phase flow characterizing ion transport, potential drop, and concentration polarization. A robust mathematical model is implemented utilizing an OpenFOAM solver, which incorporates predictor-corrector loops to address the fluid dynamics and electrochemistry interactions. This model is further enhanced by non-linear mixed boundary conditions. The findings contribute valuable insights into the operation and efficiency optimization of lithium production processes.