SELECTIVE SEPARATION OF USED FRAGMENTED POLYMERIC MATERIALS BY USING A DYNAMICALLY STABILIZED DENSE AQUEOUS SUSPENSION

摘要

Separating a comminuted mixture of polymers with a specific gravity of at least 1 into individual constituents comprises fractionating the mixture in a circulating aqueous suspension containing particles with a size of 30 mu m or less in an amount such that the specific gravity of the suspension is within 0.0005 of a threshold value for separating different polymer types.