Method and installation for separating individual valuable materials from mixed, in particular milled, plastic waste

摘要

The invention relates to a method and to an installation for separating individual valuable materials from mixed, in particular milled, plastic waste, comprising film parts, laminated film parts and hard plastic parts, plus optionally impurities. Any impurities are separated from the plastic waste. Next the plastic waste is separated into hard plastics and films as well as laminates, and the hard plastics are separated from the films, and finally the hard plastics are separated into the different types of plastic. At least one separation step comprises a sink-or-float separation.

主权项

1. A method for separating individual valuable materials from mixed plastic waste which comprises plastic film parts, plastic laminated film parts, and hard plastic parts, said method including the steps of:
a. separating said plastic waste into a heavy fraction and a light fraction by a separation process, said heavy fraction including said hard plastic parts, said light fraction including said plastic film parts and said plastic laminated film parts, said separation process including an air sifting process; b. determining a density distribution curve of said heavy fraction and using said density distribution curve of said heavy fraction to separate said heavy fraction into various densities of hard plastic parts by a sink-or-float separation process; c. determining a density distribution curve of said light fraction and using said density distribution curve of said light fraction to separate said plastic film parts from said plastic laminated film parts by a sink-or-float separation process; and, d. processing said plastic film parts and said plastic laminated film parts by one or more processes, said one or more processes for said plastic film parts is selected from the group consisting of a drying process, an agglomeration process, and an extrusion process, said processes for said plastic laminated film parts include a) a solvent treatment process to detach a plastic portion of said plastic laminated film from a non-plastic portion of said plastic film, to cause some plastic to dissolve, and combinations thereof, and b) a filtering process to separate said dissolved plastic from said non-plastic portion of said plastic film.