초록 ▼

A method for treatment of mixed wastes containing various plastics, such as municipal solid wastes, in which mechanical agitation and heat distortion of plastic films cause rupture and spilling of the contents of plastic film containers in the wastes. The wastes are introduced into a processing unit

A method for treatment of mixed wastes containing various plastics, such as municipal solid wastes, in which mechanical agitation and heat distortion of plastic films cause rupture and spilling of the contents of plastic film containers in the wastes. The wastes are introduced into a processing unit with means of heating and mechanical agitation of the contents. By the method in this invention, the plastics are separated and recovered as a mixture that may be recycled as a composite plastic used in the manufacture of various products or that may be further separated into identifiable types of plastics for recycling. The quantity of plastics recovered from MSW is greatly increased compared to previous processes using steam heat to achieve separation of the components of such mixed wastes.

대표청구항 ▼

A method for treatment of mixed wastes containing various plastics in plastic film containers to enhance the recoverability of said plastics comprising: (a) heating said mixed wastes in mass to a temperature of about 195°F. to about 215°F. at a pressure of about 10.0 to 15.0 psia by introducing satu

A method for treatment of mixed wastes containing various plastics in plastic film containers to enhance the recoverability of said plastics comprising: (a) heating said mixed wastes in mass to a temperature of about 195°F. to about 215°F. at a pressure of about 10.0 to 15.0 psia by introducing saturated steam into a pressure chamber for a processing period of between 15 minutes to one hour, to reduce the tensile strength of plastics therein without melting said plastics; (b) continuously agitating said mixed wastes while heating said wastes; (c) maintaining said pressure on said mixed wastes while heating and agitating said mixed wastes to rupture said plastic film containes sufficiently to permit classification of said mixed wastes for recycling, and (d) separating and recovering said plastics.