Every year, millions of end-of-life refrigerators and freezers are retired from homes, supermarkets, hotels and cold-storage facilities. Left untreated, these appliances become a serious environmental burden: the refrigerant gases and foam blowing agents sealed inside them can damage the ozone layer and accelerate global warming, while the steel, copper, aluminum and plastics they contain simply go to waste. A refrigerator shredding and separating plant solves both problems at once. It safely captures the hazardous gases, then breaks the appliance down into clean, marketable raw materials that can be sold back into the manufacturing chain.
Why end-of-life refrigerators need special treatment
A refrigerator is not a simple piece of scrap. It is a complex assembly of steel cabinets, copper and aluminum tubing, plastic liners, glass shelves, a compressor and polyurethane foam insulation. The two most dangerous parts are the refrigerant inside the sealed cooling loop and the blowing agent trapped in the foam. Older units may still contain CFC or HCFC gases, while modern units use HFC refrigerants such as R134a, R404A, R407C and R410A. If the cabinet is shredded without first removing these gases, they escape into the atmosphere and can also create a fire or explosion risk inside the shredder. That is why every well-designed recycling line starts with a decontamination step before any cutting begins.
Step 1: Refrigerant recovery and pre-dismantling
The process begins on a dismantling platform, where the unit is inspected and prepared by hand. Loose glass shelves, drawers and some plastic parts are removed first. The critical step is recovering the refrigerant. A dedicated refrigerant extraction machine is connected to the sealed cooling loop, and the gas is drawn out and stored in a collection tank. A good recovery unit, such as the SD-680 used in San Lan recycling lines, handles a wide range of refrigerants including R404A, R407C, R410A and R134A, and uses multi-stage filtration with oil and air separation so the recovered gas stays clean. It can recover liquid refrigerant at about 50 kg per hour and gas at about 25 kg per hour. Once the loop is empty, the compressor is removed and can be cut open with an AC compressor cutting machine to pull out the valuable copper coil inside.
Step 2: Shredding the cabinet
With the refrigerant captured and the compressor removed, the empty cabinet enters the shredder. A heavy-duty double-shaft or four-shaft shredder tears the metal shell, plastic liner and foam into fist-sized pieces. This first stage is important because it exposes the inner materials so that the following separation steps can work on them. For larger operations, a multi-purpose four-shaft shredder with a throughput of 4 to 6 tons per hour can handle not only refrigerators but also washing machines, circuit boards and other bulky e-waste, which makes the same machine useful across several recycling lines.
Step 3: Secondary crushing for uniform particle size
The shredded pieces are carried by conveyor into a hammer crusher for a second round of crushing. The crusher reduces the material to a much more uniform particle size and, in doing so, liberates the metals from the plastic and foam that surround them. Uniform particle size matters more than it may seem: sorting equipment such as magnetic separators and eddy current separators is far more accurate when the feed is consistent, so this stage directly improves the purity of the final products.
Step 4: Magnetic separation for iron and steel
The crushed material now moves along a conveyor belt under a magnetic separator. The magnet pulls out the ferrous fraction, which in a refrigerator is mostly the steel cabinet and internal framework. On a well-tuned line, iron recovery reaches 95 percent or higher. The recovered steel is clean and dense, making it a straightforward product to sell to metal processors.
Step 5: Eddy current separation for copper and aluminum
After the steel is removed, the remaining stream still contains the non-ferrous metals that carry most of the scrap value: copper from the tubing and windings, and aluminum from the evaporator and condenser coils. An eddy current separator uses a high-speed rotating magnetic rotor to induce a repelling force in these metals, literally throwing them out of the material stream into a separate collection point. This step recovers 90 percent or more of the copper and aluminum, and it is the stage that turns a recycling line into a genuinely profitable business, because copper and aluminum command much higher scrap prices than steel.
Step 6: Air separation and polyurethane foam recovery
What is left after the metals are removed is a mix of plastic and polyurethane foam. These are separated by air classification: a controlled airflow lifts the light foam away from the heavier plastic, which continues along the belt. The foam is then compacted into dense blocks so it takes up far less space and can be handled, transported and sold easily. The plastic fraction is recovered as a clean recyclable stream as well. On a complete line, both plastic and polyurethane recovery reach 90 percent or more.
What comes out of the plant
At the end of the line, an end-of-life refrigerator has been converted into five clean product streams: iron, copper, aluminum, plastic and compacted polyurethane foam. San Lan Technologies supplies complete refrigerator recycling equipment built around this exact flow. Its RSS-030 refrigerator shredding and separating plant processes 20 to 30 units per hour with a total installed power of no more than 150 kW, and is designed to deliver iron recovery of at least 95 percent, copper and aluminum recovery of at least 90 percent, and plastic and polyurethane recovery of at least 90 percent. The whole line occupies a footprint of roughly 32 by 12 meters, so it fits comfortably inside a standard industrial workshop.
Safety and environmental design
A modern refrigerator recycling line is built around safety and emission control as much as throughput. The shredding and crushing stages run in a sealed, negative-pressure environment so that dust and any residual gas cannot escape into the workshop. A pulse dust collection system captures particulates before the air is discharged. Temperature and flammable-gas concentration sensors are fitted at key points, with graded alarms and automatic shutdown, because the polyurethane foam can release cyclopentane or other flammable blowing agents during crushing. This combination of containment, filtration and monitoring is what allows the plant to meet WEEE and other environmental regulations while protecting the operators inside.
Conclusion
A refrigerator shredding and separating plant turns one of the most difficult waste streams in the appliance industry into a controlled, profitable resource recovery operation. The sequence is straightforward: recover the refrigerant, remove the compressor, shred, crush, then separate the steel, copper, aluminum, plastic and foam with magnetic, eddy current and air classification technology. For recyclers who want to enter this business, the key is to choose equipment that combines high recovery rates with proper gas containment and dust control, so the plant is both profitable and compliant. With the right line, an old refrigerator stops being a disposal problem and becomes a reliable source of clean secondary raw materials.
