FIELD: secondary treatment wastes of cardboard packages for liquid and similar wastes. SUBSTANCE: proposed method includes separation of wastes in separator into fibrous material which is re-used and sorted-out part containing metal and plastic, delivery of sorted-out part to gas generator for gasifying plastic in it and separating metal (aluminum as a rule) from generator gas. Fibrous material is obtained in form of suspension containing fibrous defibrinate produced after delivery of wastes and flushing liquid (water as a rule) into defibrator or another similar unit for coarse washing and defibrating fibrous material; fibrous material is subjected to regeneration for further use; gasifying of plastic is performed in gas generator provided with fluidized bed; metal is separated from gas escaping from gas generator. EFFECT: possibility of utilization of fibrous wastes and heat-producing capacity of plastic and extraction of aluminum and other metal at low temperatures. 18 cl, 1 dwg
