Patent ID: 6095441
Filing Date: 2000-08-01
Classification: B03B,B29B,B29K,Y02W

Abstract:
A process for the wet-mechanical separation of solids of varying densities from a plastic waste mixture, which have been contaminated by heavy mineral impurities, into a contaminate-free light plastic phase for material recycle and a heavy plastic phase for feedstock recycle, the process comprising:a) comminuting the plastic waste mixture;b) mixing of the comminuted plastic waste mixture with a separation liquid and separating and discharging heavy phase impurities from the plastic mixture in a separation vessel;c) separating any remaining heavy impurities and PVC from the mixture in a hydrocyclone as hydrocyclone underflow; andd) separating the remaining plastic waste mixture contained in the hydrocylone overflow in a sorting centrifuge into a light phase for material recycle and a heavy plastic phase free of PVC for feedstock recycle.