TREATMENT METHOD FOR WASTE POLYETHYLENE-METAL COMPOSITE MATERIAL

摘要

PROBLEM TO BE SOLVED: To recover polyethylene which is partially thermally decomposed and melted and whose hardness is increased and to recover a metal in non- oxidized state separated from the polyethylene to reuse as raw materials by heating wastes of composite materials comprising polyethylene and the metal in the absence of oxygen. SOLUTION: A waste of a composite material comprising polyethylene and a metal is dividually put in a plurality of buckets 1 and these buckets 1 are housed in a dry distillation furnace 2. Then, steam is supplied to a steam pipe 6 of a combustion furnace 5 and heated by a burner 7 to generate overheated steam in the absence of oxygen and the overheated steam is sprayed to the waste in the buckets 1 in the dry distillation furnace 2 through a header 3 and nozzle pipes 4 to dry distill the wastes. As a result, polyethylene, a constituent of the waste, is partially thermally decomposed and melted and polyethylene with increased hardness is recovered and a metal in non-oxidized state and separated from polyethylene is recovered and made reusable.