Disposing of old household appliances often turns into a search for the most profitable way to dispose of scrap metal, and the refrigerator compressor is a real “gold mine” here. Hidden inside this massive black cylinder is a significant amount of non-ferrous metal, the price of which significantly exceeds the cost of black iron. However, to gain access to this resource, it is necessary to perform a number of technical operations that require an understanding of the structure of the unit and adherence to strict safety measures.
Unlike simply disassembling the housing, extracting copper from the motor requires physical effort and specific tools, since the factory assembly is designed for tightness and durability. Copper winding The stator and heat exchanger tubes constitute the main value, but they are reliable protected by thick steel walls and varnished. The cutting process can take from 20 minutes to an hour, depending on the chosen method and the power of your equipment.
Before you begin active operations with the tool, you must make sure that the unit is completely disconnected from the power supply and the refrigerant has been removed from it. Although the volume of freon in household models is small, failure of the seal under pressure or when heated can be dangerous. Next, we will consider in detail the stages of preparation, the necessary tools and the two main methods of extracting non-ferrous metal.
⚠️ Attention: It is strictly forbidden to open the compressor if the refrigerant has not been previously drained from the system. Although modern freons are not toxic in small doses, their sudden release under pressure can damage the eyes or skin, and an open flame near the gas creates a risk of ignition.
Preparation of the workplace and necessary tools
The efficiency and safety of the process directly depend on how correctly you organize the workspace. You will need a sturdy table or workbench that can withstand the weight of the compressor (usually 8-12 kg) and impacts from heavy tools. The room should be well ventilated, since when cutting or heating, caustic smoke may be released from the combustion of the varnish insulation of the windings.
To perform the work, you will need a specific set of tools, which is best prepared in advance so as not to be interrupted in the process. The main element will be an angle grinder (grinder) with metal discs, although in some cases you can get by with a hand saw if you prefer silence to the absence of sparks. We also have a hammer, chisel, pliers and, possibly, a sledgehammer for the most severe cases.
Do not forget about personal protective equipment. Thick work gloves will protect your hands from sharp metal edges, and work clothes will protect you from sparks. If you plan to use the burning method (which we will look at later), having a fire extinguisher or a container of sand becomes a mandatory requirement.
Primary cutting: removing the body and tubes
The first step is to free the “core” from the outer casing. The black metal cylinder that we see from the outside does not contain valuable non-ferrous metal, but prevents access to the insides. First, you need to cut off all the external copper pipes that go to the unit using a pipe cutter or a hacksaw. This will make it easier to manipulate the device.
Next comes the dirtiest stage - cutting off the top and bottom covers of the case. It is important to act carefully here so as not to damage the internal copper winding with deep cuts, although it is difficult to completely avoid contact with the stator metal. After removing the covers, you will see the internal structure: an electric motor placed in an oil bath, and a suspension system.
☑️ Primary preparation of the compressor
Inside you will see a massive stator with copper coils and a rotor located inside it. They are often connected to the body or to each other by steel plates and bolts. At this stage, your task is to clean the assembly as much as possible from excess ferrous metal, leaving only what contains non-ferrous metal.
Mechanical method of copper extraction
This method is considered the most correct from the point of view of preserving the quality of scrap, since copper is not subject to thermal oxidation. The essence of the process is the mechanical separation of the copper winding and the steel core plates. This will require a chisel and a heavy hammer, as well as good dexterity.
It is necessary to make cuts or notches on the end part of the stator to release the bundles of copper wire. After this, by hitting the opposite side with a hammer or using a crowbar, you can knock out the copper coils from the stator grooves. This process requires physical effort, since the winding is often tightly pressed and filled with varnish.
| Parameter | Mechanical method | Thermal method |
|---|---|---|
| Copper quality | High (pure) | Average (oxidized) |
| Time consumption | High (40-60 min) | Low (15-20 min) |
| Necessary tool | Chisel, hammer, crowbar | Burner, fire |
| Environmental friendliness | High | Low (toxic smoke) |
If It is not possible to knock out the entire winding; you can saw the stator in half along the equator to gain direct access to the coils. Copper wire in refrigerator compressors it usually has a fairly large cross-section, which makes it a valuable raw material for remelting. After removal, the coils are cleaned of any remaining varnish and insulation.
The secret of quick cutting
Experienced metal handlers often use a homemade device of two corners clamped in a vice to quickly bite or pull out the winding without damaging it turns.
Thermal method: burning out insulation
An alternative to mechanical labor is heat treatment, which allows you to quickly get rid of varnish insulation and even separate copper from iron due to the difference in expansion temperatures. However, this method has serious disadvantages: copper oxidizes, becomes brittle and loses value when returned, and a huge amount of toxic smoke is released.
To implement this method, the removed motor or individual coils are placed in a metal container (barrel) and a fire is lit. The temperature should be sufficient to burn off the varnish, but not melt the copper (the melting point of copper is 1083°C, so a regular fire is safe in this regard, but thin areas can be melted). After cooling, the varnish turns into ash, which is easy to shake off.
⚠️ Attention: Burning wire insulation is strictly prohibited in residential areas and garage cooperatives. The released dioxins and furans are extremely toxic. Use this method only away from people and animals, in an open space.
There is also the option of baking in an oven, if you have access to such equipment, which is more controlled. But even in this case quality of scrap is reduced, since the surface layer of the metal oxidizes, forming copper oxide, which will have to be removed by pickling or mechanically before remelting.
Output analysis copper and types of compressors
The amount of copper that can be obtained from one unit varies greatly depending on the model, year of manufacture and manufacturer. Old Soviet refrigerators (“ZIL”, “Biryusa”) were often equipped with more massive motors with a higher content of non-ferrous metal compared to modern energy-efficient models.
On average, the weight of copper windings ranges from 0.5 to 1.2 kg per compressor. The rest of the mass consists of steel, cast iron and oil. It is also worth considering the presence of copper tubes on the body: in older models there are more of them and they are thicker, while new ones often use aluminum or copper-plated steel, which reduces the final weight of non-ferrous metal.
Below is a table of the approximate copper yield from popular types of compressors:
| Type/Model | Compressor weight | Copper weight (winding) | Copper weight (tube) |
|---|---|---|---|
| Soviet (R-12) | 12-14 kg | 1.0 - 1.2 kg | 0.5 - 0.7 kg |
| Modern (R600a) | 8-10 kg | 0.5 - 0.7 kg | 0.2 - 0.3 kg |
| Industrial | 20+ kg | 2.0 - 3.5 kg | 1.0+ kg |
It is important to understand that inverter compressorsthat are becoming standard in the premium segment may have a different motor design where the copper is distributed differently, and sometimes replaced by other conductive alloys in the control electronics, although in the motor itself copper remains the main material.
Sorting and preparation for delivery
After the copper has been extracted, it must be properly prepared for delivery to a scrap metal collection point. Reception points divide copper into classes: “Shine” (new, clean, without oxides), “Mix” (a mixture of pure and tinned) and “Zhzhenka” (heat-treated). The purer the metal, the higher the price per kilogram.
If you used the mechanical method, your copper will most likely be in the Mix or even Shiny category if you can remove the insulation without heating. The thermal method automatically transfers the metal to the “Zhzhenka” category, the cost of which is 10-15% lower. Therefore, if the volume is large, it makes sense to spend time on mechanical cleaning.
Do not forget to also collect and sell the steel body and rotor separately - this is black scrap, which also has value, although smaller. Oils drained from the compressor must be disposed of through special collection points for used oils; pouring them into the ground or sewer is prohibited by environmental legislation.
Frequently asked questions (FAQ)
Approximately how much does copper from one compressor cost?
The cost depends on current scrap quotations and weight of recovered metal. Considering that an average of 0.7–1 kg of copper (winding + tubes) comes out of one household compressor, and the price of copper scrap varies, the proceeds will be a notional amount equivalent to the cost of 1-2 liters of gasoline. The main point is to recycle large quantities of equipment.
Is it possible to hand over an entire compressor without disassembling it?
Yes, scrap metal collection points accept entire compressors as “mix” or “electric motors”. However, the price per kilogram in this case will be significantly lower, since the receiver will make a discount on the content of ferrous metal, oil and contaminants. Disassembly is beneficial for large volumes.
Is it dangerous to open the compressor at home?
The main danger is the residual pressure of freon and the possibility of flying metal fragments upon impact. Also, when cutting with a grinder, sparks fly, and when burned, toxic smoke is produced. If you follow safety precautions (glasses, gloves, ventilation), the risk is minimal.
Are there other valuable metals in the compressor?
In the motor itself there is only copper and steel. Some older models may have used aluminum (instead of copper) in the windings, which dramatically reduces the value of the assembly. This can be determined by the color of the wire on the cut or with a magnet (aluminum is not magnetic, but neither is copper, you need a test for color and weight). There are no precious metals in standard household compressors.
What to do with compressor oil?
Compressor oil is a waste of hazard class III-IV. It should not be poured into the ground or sewer. Collect the oil in a sealed plastic container and hand it over to a special collection point for used oils or to a service station where waste is accepted.