Method and device for treatment and recycling of waste refrigerators

A method for treatment and recycling of waste refrigerators, comprising the steps of:

• a) placing a feeding device, a double shaft shredder equipped with a pressing device, a first belt conveyor, a rolling crusher, a second belt conveyor, a first vibratory feeder, a cylindrical iron remover, a second vibratory feeder, and an eddy current sorter in an enclosed workshop, equipping the workshop with a multistage ventilation system, a protective device of nitrogen, a device for spraying, dedusting, and cooling, an on-line detection and alarm control device for cyclopentane gas concentration, polyurethane dust concentration, and temperature, safety devices for static grounding, main circuit switching control, emergency stop control, alarm and status display, and air vent monitoring;
• b) manually disassembling waste refrigerators at a disassembling station in the front of a production line to recover their components:
• plastic parts, electrical boxes, wires, glasses, and circuit boards;
• c) recycling refrigerants from compressors using a machine for refrigerant recovery at a fluoride-extracting station in the middle of the production line;
• d) manually disassembling the compressors and condensers that are not easily to be crushed by a crusher at a disassembling station in the rear of the production line;
• e) transferring refrigerator bodies and doors to the double shaft shredder equipped with a pressing device via the feeding device for preliminary crushing, and transferring crushed materials using the first belt conveyor to the rolling crusher for secondary crushing, or directly transferring the refrigerator bodies and doors to a mixing crusher for crushing via the feeding device so that metals, plastics, and foams are completely dissociated for further separation and sorting;
• f) sorting out the crushed materials by wind force, collecting polyurethane foams using the cyclone collector, and discharging waste gases;
• g) transferring remaining materials via the second belt conveyor and separating black metallic iron using a self-discharge type iron remover made of permanent magnet;
• h) leading the materials to the cylindrical iron remover via the second belt conveyor and the first vibratory feeder in a continuous and even manner for magnetic separation of remaining iron, and collecting the iron into a skip via a hopper of the cylindrical iron remover;
• and
• i) collecting remaining materials into the second vibratory feeder via another hopper of the cylindrical iron remover, transferring the materials via the second vibratory feeder to the eddy current sorter in a continuous and even manner for separation of non-ferrous metals comprising cooper, aluminum, plastics, and thick polyurethane foam, and collecting the cooper, aluminum, plastics, and thick polyurethane foam into different skips.