Determination of the peak impact load of pellets depending on their granulometric composition

Despite the importance of negative impact decrease on the environment by dust, formed at iron ore pellets transporting, and reduction losses at their abrasion, influence of pellets granulometric composition on their softening during their transporting studied not enough. To determine the pellets peak impact load non-fluxed pellets of different granulometric composition and five fractions 8, 10, 12, 14 and 16 mm were used taken from sinter machine of real production. For this experiment assumptions were made that all the pellets have a ball form and the same chemical composition, pellets of all fractions have the same density, a pellet starts to move with a zero velocity. In the experiments the pellets were falling from 1 m height on a hard surface (box bottom). As a result of experiments dependence of the number of strikes undergone by the pellets till complete destruction on their granulometric composition was determined. It was revealed that the biggest number of strikes (170) a pellet of 10 mm diameter can withstand, and the smallest one - a pellet of 8 mm diameter. Therefore 10 mm pellets can be used for long distance transporting, but 8 mm pellets should be decreased if possible in general volume of pellets, since they will be the first to begin the abrasion after 45 strikes.