How to separate copper in ac unit from other materials during recycling

An air conditioner may look like a bulky box of steel and plastic, but inside it sits one of the most valuable materials in the recycling industry: copper. Between the condenser coils, the evaporator, the connecting pipes and the compressor, a single residential AC unit can hold several kilograms of copper, and commercial units hold far more. The challenge is that this copper is tightly bonded to aluminum fins, steel housings, plastic insulation and a sealed compressor. Learning how to separate copper in AC unit from other materials during recycling is therefore the key to turning end-of-life air conditioners into a profitable and environmentally responsible business.

Before any separation begins, it helps to know exactly where the copper sits. The two heat exchangers, the condenser and the evaporator, are built from copper tubing threaded through hundreds of thin aluminum fins. The compressor, a sealed steel cylinder, contains copper windings wrapped around its motor core. Finally, the short connecting pipes and the internal capillaries link all these parts together. Each of these copper fractions needs a different treatment, which is why a complete recycling line combines cutting, shredding, magnetic and density separation rather than relying on one single machine.

The very first step is not about copper at all, it is about safety and compliance. Every AC unit contains refrigerant gas such as R-22 or R-410A, which must never be released into the atmosphere. A dedicated refrigerant recycling machine such as the SD-680 pulls the gas out of the sealed loop through a dual-input design with multi-stage filtration, oil separation and air separation, and stores it in a collection tank for reuse or safe disposal. The SD-680 recovers liquid refrigerant at 50 kg per hour and gas at 25 kg per hour, and it handles common refrigerants including R404A, R407C, R410A and R134A. Skipping this step is both environmentally harmful and illegal in most jurisdictions, so it always comes first in any professional recycling line.

Once the refrigerant is removed, the compressor becomes the next target. The copper windings inside are high-purity copper, but they are sealed inside a thick steel shell that no shredder can liberate cleanly. This is where an AC compressor cutting machine earns its place in the line. The machine uses three motors, a 1.1 kW lifting motor, a 3 kW hydraulic station and a 3 kW rotary disc, to cut the compressor shell open so the copper coil can be pulled out in one piece. The result is clean, bright copper wire that commands a much higher scrap price than mixed material, plus a steel shell that can be sold separately. For recyclers processing large volumes, this dedicated cutting step is far more efficient than trying to split compressors with a grinder by hand.

With the compressor handled, the remaining body of the AC unit, the coils, the fins, the steel frame and the plastic casing, moves into a shredding and separating plant. A heavy-duty shredder first breaks the bulky structure down into smaller pieces so that the copper tubes and the aluminum fins physically separate from each other. In a complete refrigerator and AC recycling line, this stage is designed to handle the whole unit in one pass rather than requiring hours of manual dismantling.

After shredding, the material stream is a mix of steel, copper, aluminum and plastic. An overbelt magnet lifts out the ferrous steel first, because removing it early protects the downstream separators and keeps the non-ferrous metals clean. In a well-run plant, this stage recovers over 95% of the iron content, and the recovered steel scrap has its own market value.

The remaining copper and aluminum mixture is fed into a granulator that reduces it to a uniform small size, breaking the last physical bond between the copper tube and the aluminum fin. From here, the two metals are separated by air density. Copper has a density of roughly 8.96 g/cm³ while aluminum sits at about 2.70 g/cm³, so an air separator uses upward air currents to lift the lighter aluminum flakes while the heavier copper granules ｄｒｏｐ out below. This is the core of the separation process, and it is why a purpose-built plant can recover 90% or more of both the copper and the aluminum from a shredded AC unit, compared with the losses that come from hand-stripping coils.

For recyclers who want the highest purity grades, the line does not stop at air separation. An eddy current separator can eject any remaining non-ferrous metal from the plastic stream, and electrostatic separation captures the fine metallic dust that escapes the air tables. The plastic casing, usually ABS or HIPS, is also recovered and can be sold or pelletized, so the whole unit is diverted from landfill rather than just the copper. The result is a set of clean, saleable fractions: bright copper, aluminum, steel, and plastic.

It is tempting to strip AC units by hand, because the copper is visible and easy to reach. But manual work is slow, and it leaves the aluminum fins stuck to the copper tubes, which drags down the purity of both metals and lowers the price a scrap yard will pay. A mechanical line processes whole units at a steady rate, keeps the copper clean, and protects workers from the sharp edges, dust and residual refrigerant that come with hand dismantling. For a business handling more than a handful of units a week, the machine pays for itself quickly.

The exact configuration of a recycling line depends on the volume you process and the purity you want to sell. A small operation can start with a refrigerant recycling machine and an AC compressor cutting machine, while a larger facility will invest in a complete refrigerator and AC recycling machines line that combines shredding, magnetic separation and air classification. San Lan Technologies Co., Ltd, a manufacturer based in Jiangxi, China, has supplied WEEE and e-waste recycling equipment to customers in more than 20 countries since 2007, and its engineers help buyers design a line around their local scrap supply and budget. Whichever route you choose, the principle stays the same: recover the refrigerant first, cut the compressor, shred the body, and separate by density. Follow those steps and the copper in every old air conditioner will end up where it belongs, back in the supply chain instead of in a landfill.