An experimental study was conducted on the pressure drop characteristics in a vertical tank with non-uniform sinter particles. The aim of this study was to present a modified Ergun's correlation to calculate the pressure drop in packed beds with non-spherical particles. The sinter particles of different diameter, d(p), with a range of sphericity, 0.68 <= Phi <= 0.89 were used in random packing with a range of bed layer voidage, 0.44 <= epsilon <= 0.53, and the bed geometrical factor (inner diameter of vertical tank to sinter particle equivalent diameter ratio) was from 13.8 to 45.2. The pressure drop of unit bed layer height Delta P-Bed / H of the packed beds was measured in a range of air superficial velocity, 0383 m/s <= u <= 333 m/s. The effects of air superficial velocity and sinter particle diameter on the pressure drop of unit bed layer height were determined in the covered test cases. The results show that compared with the well-known Ergun's equation and other proposed experimental correlations, the modified Ergun's correlation is able to fit the whole set of measurements of Delta P-Bed / H best, and the mean error between the experimental values of Delta P-Bed / H from this work and the values calculated from the modified Ergun's correlation is 4.6%. (C) 2015 Elsevier B.V. All rights reserved.