In the present study, the results of simulations of solid-liquid mixing inside a stirred vessel with the Rushton turbine impeller are presented. The simulations are conducted by using the Lagragian model to track solid particles. Behaviors of particles are related to the flow formation inside the stirred vessel. The velocity fields at various positions are compared with the experimental data to validate of numerical simulations. Overall, the comparisons between the results show good agreement between the simulations and the experiments. The particle distributions are predicted by numerical simulation based on the validated flow field. In addition to evaluated degree of solid-liquid mixing, the inter-particle distance is introduced and adopted considering individual behavior of particles.