An application of numerical simulation of multiphase flow for the redesign of a mixer agitator in Pb refining process

The paper presents numerical simulation of multiphase turbulent flow in a mixing crucible unit. Results of simulation were used for redesign of mixer agitator to achieve better performance of the Pb refining process. The simulation is based on Euler-Lagrange description of turbulent multiphase flow with the one way coupling, due to low concentration of solid state particles and significant differences in density of coexisting phases, base metal and particles. Dispersions of solid particles are traced using stochastic-deterministic approach. The developed construction of an agitator has been tested in the industrial Pb refining factory, giving very promising results in comparison with long term statistical data. Duration of unit operations of removal copper and tin was reduced of about 40% together with even better removal efficiency and less energy and reagents consumption.