A new numerical procedure is proposed to analyse solid particle erosion caused by slurry. The procedure works involves two mechanisms. First, high-concentration particles are considered as a continuous granular phase and tracked through the Eulerian–Eulerian two-fluid method. Second, the continuous granular phase near the pipe wall is converted into discrete incident and rebound particles by a particle separation method. The procedure is validated through comparison with experimental data available in the literature. Additionally, the performance and efficiency of the new method are compared with those of the dense discrete phase method and the discrete element method. Display omitted •The new method involves the analysis of solid particle erosion caused by high-concentration particles.•High-concentration particles are treated as a continuous granular phase.•A particle separation method is employed to convert the continuous phase into discrete particles.•Incident particles are distinguished from rebound particles in the near-wall region.•The new method significantly reduces the required computational resources compared with DEM and DDPM.