A classifier including a housing to take in air flow from below into a radially outer region of an inside space; a flow deflection portion to deflect the air flow toward a center axis of the housing; and an annular rotational portion disposed rotatably in a radially inner region positioned on a radially inner side of the radially outer region, of the inside space of the housing, and configured to classify particles which accompany the air flow. The annular rotational portion includes a plurality of rotational blades arranged at intervals around a rotational axis of the annular rotational portion. The plurality of rotational blades form an outer shape of the annular rotational portion forms an angle θ of not greater than 75° with a segment extended in a horizontal direction from the annular rotational portion outward in a radial direction, in a side view of the annular rotational portion.

A classifier including a housing to take in air flow from below into a radially outer region of an inside space; a flow deflection portion to deflect the air flow toward a center axis of the housing; and an annular rotational portion disposed rotatably in a radially inner region positioned on a radially inner side of the radially outer region, of the inside space of the housing, and configured to classify particles which accompany the air flow. The annular rotational portion includes a plurality of rotational blades arranged at intervals around a rotational axis of the annular rotational portion. The plurality of rotational blades form an outer shape of the annular rotational portion forms an angle θ of not greater than 75° with a segment extended in a horizontal direction from the annular rotational portion outward in a radial direction, in a side view of the annular rotational portion.

A method .sub.ES1 for the continuous aeraulic separation of particulate materials stemming from electronic scrap and made up of a mixture of particles which are heterogeneous in terms of both particle size and density, characterized in that it comprises the following successive steps: (a) grinding the particles (b) generating a gas flow carrying the ground particles, (c) carrying out a first aeraulic separation over said gas flow in order to separate the particles contained therein into a first fraction made up of the coarsest particles of various densities, and a second fraction made up of the finest particles, (d) carrying out a second aeraulic separation of said first fraction in order to separate the particles contained therein into a third fraction made up of the coarsest and densest particles and a fourth fraction made up of the coarsest and least dense particles, (e) reinjecting the third or the fourth fraction to the grinding input, and (f) recovering the second and the fourth fraction or the third fraction, as applicable, as output products.

A centrifugal classifier including a classifier housing having at least one coarse material outlet and a classifier wheel, revolving in the classifier housing. The classifier wheel is comprised of a classifier drum and a classifier wheel shaft forming the axis of rotation of the classifier drum. A guide member is arranged near the coarse material outlet, at a set distance from the inner jacket surface of the classifier housing section surrounding the classifier drum. The guide member is configured such that classifying material flowing along the inner jacket surface at a radial distance less than or equal to the set distance circumvents the guide member and is discharged into the coarse material outlet and classifying material flowing along the inner jacket surface at a radial distance greater than the set distance is deflected in a radially inward direction toward the classifying drum.

A centrifugal classifier including a classifier housing having at least one coarse material outlet and a classifier wheel, revolving in the classifier housing. The classifier wheel is comprised of a classifier drum and a classifier wheel shaft forming the axis of rotation of the classifier drum. A guide member is arranged near the coarse material outlet, at a set distance from the inner jacket surface of the classifier housing section surrounding the classifier drum. The guide member is configured such that classifying material flowing along the inner jacket surface at a radial distance less than or equal to the set distance circumvents the guide member and is discharged into the coarse material outlet and classifying material flowing along the inner jacket surface at a radial distance greater than the set distance is deflected in a radially inward direction toward the classifying drum.

A method for continuous aeraulic separation of particulate materials consisting of a mixture of particles that is heterogeneous in both particle size and density is provided. The method includes grinding particles of materials, generating a gas stream conveying the ground particles, first aeraulic separation on the gas stream in order 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 finest particles. A second aeraulic separation is performed on the first fraction in order to separate the particles that it contains into a third fraction consisting of the coarsest and/or most dense particles and a fourth fraction consisting of the least coarse and/or the least dense particles. A re-injecting of the third fraction or the fourth fraction at the inlet of the grinding is performed while simultaneous recovery of the second fraction as well as the fourth fraction or the third fraction, respectively, as output products.

A method for continuous aeraulic separation of particulate materials consisting of a mixture of particles that is heterogeneous in both particle size and density is provided. The method includes grinding particles of materials, generating a gas stream conveying the ground particles, first aeraulic separation on the gas stream in order 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 finest particles. A second aeraulic separation is performed on the first fraction in order to separate the particles that it contains into a third fraction consisting of the coarsest and/or most dense particles and a fourth fraction consisting of the least coarse and/or the least dense particles. A re-injecting of the third fraction or the fourth fraction at the inlet of the grinding is performed while simultaneous recovery of the second fraction as well as the fourth fraction or the third fraction, respectively, as output products.

The invention relates to a method and system for the environmental remediation of materials that are contaminated with heavy minerals, such as heavy metals. The invention finds utility in removing heavy minerals from materials such as soils, sediments, mine tailings and ores. The invention provides a means for removing heavy minerals from contaminated materials without the use of water while reducing the generation of dust. Thus, the invention provides an environmentally friendly method for the remediation of sites that are contaminated with heavy minerals.

The invention relates to a method and system for the environmental remediation of materials that are contaminated with heavy minerals, such as heavy metals. The invention finds utility in removing heavy minerals from materials such as soils, sediments, mine tailings and ores. The invention provides a means for removing heavy minerals from contaminated materials without the use of water while reducing the generation of dust. Thus, the invention provides an environmentally friendly method for the remediation of sites that are contaminated with heavy minerals.

A classifying device may be used to classify a granular material flow. The classifying device may comprise a first inlet that allows a first material flow into the classifying device, a second inlet that allows a second material flow into the classifying device, a static classifier, and a dynamic classifier. The static classifier may be positioned such that the static classifier at least partially surrounds the dynamic classifier. The classifying device may comprise a distributing device that is designed in such a manner that it supplies the material flow of the first inlet to the static classifier and the material flow of the second inlet to the dynamic classifier.