Particle segregation in the feeding system is a critical issue, leading to the nonuniform distribution of particles inside the flash smelting furnace and subsequently resulting in the production of unreacted materials. This study employs DEM to investigate the flow and segregation of concentrate particles in a scaled feeding system. The numerical simulations, based on calibrated parameters, are validated against two experiments, demonstrating good agreement. The influences of feeding rate, chute width, and sloping angle on particle segregation are analyzed. The severest segregation is obtained under the current operating parameter in metallurgical plants. Further increasing the feeding rate will not result in a continuous worsening of segregation. Notably, it is confirmed that increasing the chute sloping angle can largely reduce particle segregation. Meanwhile, segregation can also be reduced by narrowing the chute width; however, this leads to more particle accumulation at the periphery, potentially impacting subsequent dispersion within the furnace.