Mechanisms and Kinetics of Separation of Impurities of Large and Small Particles in Gravity Flow of Granular Material

• Published in: Chemical and petroleum engineering Vol. 58; no. 1-2; pp. 3 - 12
• Main Authors: Dolgunin, V. N., Kudi, A. N., Tarakanov, A. G.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-05-2022; Springer; Springer Nature B.V
• Subjects: Chemistry; Chemistry and Materials Science; Design; Diffusion effects; Geotechnical Engineering & Applied Earth Sciences; Granular materials; Impurities; Industrial Chemistry/Chemical Engineering; Industrial Pollution Prevention; Irregularities; Mineral Resources; Numerical Analyses; Operating Experience; Process intensification; Separation; Solid phases; Stress relaxation; migration; granular material; separation by size; segregation; quasi-diffusion; rapid gravity flow
• ISSN: 0009-2355; 1573-8329
• DOI: 10.1007/s10556-022-01047-7

The processes of separation of impurities of particles of different sizes are analyzed under conditions of irregularity of structural and kinematic parameters of a fast sheared gravity flow of granular materials on a rough slope using mathematical model of distributions of impurity concentration in the flow and comparing calculation results with experimental data. It was found that separation of impurities of large particles is essentially a consequence of relaxation of stresses generated on these particles as concentrators of local stresses and that separation of small particle occurs with dominance of the effect of quasi-diffusion separation of particles under conditions of spatial irregularity of distribution of the solid phase. Methods for separation process intensification are identified.