Gravity Separation Technology of Grain Materials Differ in Complex of Physical and Mechanical Properties of Particles
Advancing the chemical engineering fundamentals
Particulate Systems (T2-3P)
Keywords: separation, grain materials, segregation, migration
There is an actual problem consisting in separation of grain materials differ in complex of physical and mechanical properties. The traditional solving this problem is characterized by low efficiency and reliability caused by multi-stage treatment of particulate mixtures.
These problems may be solved by means of the gravity separation technology with countercurrent flow of nonuniform particles “Multiseg”. The separation process takes place due to segregation and migration effects of particles during their interaction in an aerated rapid shear gravity flow. In the present paper the cascade gravity separation is suggested on the first separation stage. The gravity cascade separator consists of the cascade of rough perforated chutes. The mixture flow discharging threshold of each chute is divided into parts. The parts differing in the test particle quantity are displaced towards each other. These multistage countercurrent displacements allow to distribute the mixture particles into some fractions according to the manifestation extent of the test particle properties. The cascade separation allows to provide conditions for selecting a lot of several fractions of particulate mixtures.
The fraction concentrating the product is separated finally on the second separation stage by means of the drum separator “Multiseg” [1]. This separator realizes the analogous separation mechanism combining the effects of segregation, migration and pneumatic classification in a transversally aerated gravity flow.
The gravity separation technology allows to separate particles differing not only in size but also in size and density, size and shape, size and roughness etc. simultaneously. This technology is characterized by high reliability because it has not sieves and does not need any reequipping at the change of the treated mixture properties due to the principle of self-separating particles. Besides it may be used to combine separation and heat-mass-transfer processes, for example drying, heating etc.
1. Dolgunin V.N. et. al., Gravity separation technology of particulate materials of high uniformity. HUN-Pra-PARTEC International Conference on Practical Aspects of Particle Technology, Proceedings, Budapest, Hungary, 2001, p.p. 215-218.
Presented Monday 17, 13:30 to 15:00, in session Particulate Systems (T2-3P).
