Research on particle jamming in the openings of a freely laid sieving surface of a vibrating screen

The purpose of the study was to determine the conditions for stabilizing the granulometric composition of agglomerate fractions of 5…40 mm through vibratory impact processing on a freely laid sieving surface of a vibrating screen. The research employed an analytical approach and numerical modeling, considering the kinematics of particle movement on the sieving surface. The process was divided into two stages: joint movement with the sieving surface and free motion under gravity. Mathematical models were used to analyze the motion characteristics of particles, including speed, lift height, and duration of free movement. The study results demonstrated that stabilizing the granulometric composition of the agglomerate is achieved by breaking particles along stress concentrators formed in weak zones, such as slag bonds or vitrification areas. For effective stabilization, it is necessary to ensure the dynamic parameters of the vibrating screen, specifically vibration accelerations in the range of 32.9…47.3 m/s² at a constant amplitude of 0.003 m. For the first time, the kinematics of agglomerate particle motion on a freely laid sieving surface under dynamic loads were described in detail, and critical parameters necessary for granulometric composition stabilization were established. The study's findings are practically significant as they improve the mechanical processing technologies of agglomerates, specifically by reducing energy consumption in preparing burden materials for blast furnaces and enhancing the efficiency of metallurgical production. The use of the results allows optimization of sintering plant operations, ensuring high-quality preparation of burden materials.