Process and installation for the continuous aeraulic separation of particulate materials consisting of a mixture of heterogeneous particles both in particle size and density

摘要

The invention relates to a process for the continuous aeraulic separation of particulate materials consisting of a mixture of particles heterogeneous both in particle size and in density, characterized in that it comprises the steps of grinding the particles of materials, of generating 'a gas flow conveying the crushed particles, first aeraulic separation on said gas flow to separate the particles it contains into a first fraction consisting of the coarsest particles with variable densities and a second fraction consisting of the most fine, second aeraulic separation on said first fraction to separate the particles it contains into a third fraction consisting of coarsest and / or densest particles and a fourth fraction consisting of less coarse and / or less dense particles , re-injection of the third fraction or of the fourth fraction at the entrance of the grinding, and recovery the second fraction as well as the fourth fraction or the third fraction, respectively, are simultaneous as the output products. Figure for the abstract: Fig. 2