How to efficiently remove paint from aluminum cans?

In the aluminum recycling industry, pretreatment of waste aluminum cans (UBCs) is crucial for improving the purity and recovery rate of molten aluminum. Aluminum cans are coated with a large amount of paint and coatings; direct smelting not only produces a large amount of aluminum dross, causing metal loss, but also releases harmful gases. The emergence of continuous carbonization furnaces provides an industrialized and efficient solution for removing paint from aluminum cans.

The continuous carbonization furnace employs advanced physical paint removal technology, with the following core processes:

Uniform feeding: Pre-crushed aluminum can fragments are fed into the carbonization furnace via a screw conveyor.

Oxygen-free/oxygen-deficient heating: Within a sealed furnace chamber, the aluminum cans are heated to approximately 300℃-500℃. Within this temperature range, the paint coating on the can surface undergoes a pyrolysis (carbonization) reaction.

Continuous peeling: As the furnace slowly rotates, the material continuously tumbles and rubs within the furnace, causing the pyrolyzed paint film to become brittle and gradually peel off from the aluminum substrate.

Automatic discharge: The carbonized aluminum shavings are discharged from the discharge port and enter the cooling system, ultimately yielding high-quality recycled aluminum raw materials with clean surfaces, no paint, and no inorganic matter.

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