Aeraulic separation process and installation

摘要

A process for continuous aeraulic separation of particulate materials made up of a mixture of heterogeneous particles both in particle size and in density, comprises the succession of the following stages: (a) grinding of the particles, (b) generation of a flow of gas conveying the ground particles, (c) first aeraulic separation on said gas flow to separate the particles which it contains into a first fraction consisting of the coarsest particles with variable densities, and a second fraction consisting of the finest particles (d) second aeraulic separation on said first fraction to separate the particles which it contains into a third fraction consisting of the coarsest and densest particles and a fourth fraction consisting of the coarsest and least dense particles, (e ) reinjection of the third fraction or the fourth fraction at the entrance to the broya ge, and (f) recovering the second fraction and the fourth fraction or the third fraction, respectively, as output. Figure for the abstract: Fig. 2A