Abstract: In order to investigate the solid-liquid fluid flowing law and work performance of two-stage slurry pump for deep-sea mining，numerical simulation and performance prediction to the two-stage slurry pump were conducted by using the computational fluid dynamics software. The methods of topological blocking and structural meshing in the domain of the slurry pump were described. A three-dimensional turbulent flow simulation was performed with a RNG κ-ε turbulence model and multiple reference frame to obtain pressure， velocity and kinetic energy distribution. Furthermore， the performance curve of the slurry pump with different particle properties was determined based on the simulation results. The research shows that the particle properties have an important influence on the working performance of slurry pump. With the same particle concentration， the head and efficiency of the pump are increased with the decrease of particle size. It is appropriate to control the particle concentration of 5%-10%.

Key words: deep-sea mining, two-stage slurry pump, structural mesh, numerical simulation, computational fluid dynamics