Abstract: The invention relates to a process for the simultaneous preconcentration and preselection of at least one group of used polymer materials of various compositions, as a mixture with one another and with contaminant materials, originating from the destruction, by grinding, of durable consumer goods that have reached the end of life, which can be recycled in the fields of plastics processing. This process is characterized in that it includes, in order, a) a step of separation in a hydraulic medium, the density of which is adjusted to a value ds between 1.100 and 1.900, b) a step of separation of the supernatant fraction from a), a step of grinding c) the supernatant fraction from b), then a step d) of mechanical separation of the fraction originating from c) followed by a wetting step e) and a final step f) delivering preconcentrated and preselected used synthetic polymer materials.

Abstract: The invention relates to a process for the simultaneous preconcentration and preselection of at least one group of used polymer materials of various compositions, as a mixture with one another and with contaminant materials, originating from the destruction, by grinding, of durable consumer goods that have reached the end of life, which can be recycled in the fields of plastics processing. This process is characterized in that it comprises, in order, a) a step of separation in a hydraulic medium, the density of which is adjusted to a value ds between 1.100 and 1.900, b) a step of separation of the supernatant fraction from a), a step of grinding c) the supernatant fraction from b), then a step d) of mechanical separation of the fraction originating from c) followed by a wetting step e) and a final step f) delivering preconcentrated and preselected used synthetic polymer materials.

Abstract: Process for the selective separation, and for the simultaneous increase in purity, of two spent, fragmented, synthetic organic materials having different densities, mixed together or mixed with various contaminating materials to be eliminated, by means of dense aqueous media, each aqueous medium of which has a chosen density “ds” as threshold for separating said organic materials and contaminants, characterized in that the process comprises: a) a step of separating the mixture into two streams, a supernatant stream (a1) and a settled stream (a2); b) a step of separating the components of the supernatant stream (a1), by eliminating the supernatant fraction and collecting the settled fraction formed from the fragments of the first recyclable spent synthetic organic material; c) a step of separating the components of the settled stream (a2) by collecting the supernatant fraction and eliminating the settled fraction; and d) a step of separating the components of the supernatant stream by eliminating the supernata

Abstract: The invention relates to a method for selectively separating mixed synthetic organic materials such as filled or non-filled polymers and/or copolymers that are wastes, particularly used, for recycling in order to upgrade them. These synthetic organic materials result from the destruction by crushing of automobiles and durable consumer goods that have reached the end of their serviceable lives. Said selective separation method acts by separating these materials with regard to a density threshold selected in a dense medium consisting of separating fluid liquid suspensions composed of powdery particles dispersed in an aqueous phase. These suspensions are stabilized by using a dynamic stabilizing means at a density threshold value selected for causing the selective separation of a determined fraction from the mixture of the used materials to be separated.

Abstract: The invention relates to a method for selectively separating synthetic organic materials such as polymers and/or reinforced or non-reinforced copolymers in the form of wastes, in particular domestic wastes recyclable in order to be reused. Said synthetic organic materials are recuperated from broken used cars and obsolete consumer durable products. The inventive method for selective separation consists in separating materials which have an identical density threshold value and are selected from a dense medium comprising separate liquid fluid suspensions which consist of powdery disperses particles in an aqueous phase and are stabilized with respect to the density threshold value selected in such a way that a selective separation of a determined fraction of the mixture of separable used material is initiated.

Abstract: Process for pre-concentration of recoverable polymer materials formed from residues from grinding consumer durable goods at the end of their lives such as automobiles, computer equipment and household appliances, consisting of treating the residue by steps in sequence consisting of screening, aeraulic separation, grinding and ultimate aeraulic separation, to eliminate the major part of contaminating materials from them, such as metals, glass, rubber, sand or others in order to obtain a fraction pre-concentrated in recoverable polymer materials by recycling. The pre-concentration process is a means of reaching preferably at least 85% by weight of recoverable polymer materials by recycling.

Abstract: The invention relates to a method for selectively separating synthetic organic materials such as polymers and/or reinforced or non-reinforced copolymers in the form of wastes, in particular domestic wastes recyclable in order to be reused. Said synthetic organic materials are recuperated from broken used cars and obsolete consumer durable products. The inventive method for selective separation consists in separating materials which have an identical density threshold value and are selected from a dense medium comprising separate liquid fluid suspensions which consist of powdery disperses particles in an aqueous phase and are stabilised with respect to the density threshold value selected in such a way that a selective separation of a determined fraction of the mixture of separable used material is initiated.

Abstract: The invention concerns a method for separating all categories of polymer materials derived from waste characterised by successive steps and phases, implemented in the following order: sequentially, a grinding step is followed by a cylindrical drum form factor mechanical separation step, which is followed by a first density separation step in parallel steps, followed by energetic cleaning of the polymer materials and ending with a second density separation step in parallel steps. Said polymer materials can, if required, be extruded. The method enables to obtain different categories of polymer materials, and in particular PE, PP, PS, ABS, PP filled at 20 to 40% with PA, PMMA, Xenoy™, PVC.