How To Easily Remove Paint From Aluminum?

What process is most suitable for removing baked enamel from aluminium products? Common methods include: chemical paint stripping, pyrolytic carbonisation, and mechanical separation. The chemical paint stripping process has the drawback of being costly and generating wastewater pollutants, making it less environmentally friendly. Mechanical paint removal often results in incomplete stripping. Relatively speaking, the pyrolytic carbonisation process (carbonization paint removing furnace) delivers superior paint removal results. Equipped with environmental treatment facilities, it causes no pollution to the environment.

The carbonization paint removing furnace is a specialised technology for treating paint layers on waste aluminium products. It decomposes the paint layer through high-temperature carbonisation, thereby cleaning the metal substrate. This process holds significant importance in resource recovery and environmental protection. It effectively reduces pollution from waste aluminium products. Simultaneously, it recovers high-purity aluminium and steel materials, achieving resource recycling.

carbonization paint removing furnace

Principle of Pyrolysis Paint Removal for Aluminium Products

The core principle of the carbonization paint removing furnace involves inducing pyrolysis reactions on the paint surface within a high-temperature, oxygen-depleted environment. The paint layer primarily consists of organic resins, pigments, and additives. Under elevated temperatures (approximately 400-600°C), organic compounds decompose into gases and small molecular substances. Metal products (aluminium profiles) exhibit stable properties. The carbonisation process thoroughly removes the paint layer, restoring the metal surface to a clean state. This facilitates subsequent smelting or direct reuse.

Compared to traditional chemical paint stripping methods, the high-temperature carbonisation process delivers significantly superior results. Chemical stripping requires strong acids, strong alkalis, and organic solvents. This process generates substantial wastewater and waste residue, and may corrode the metal substrate. The pyrolysis carbonisation process requires no chemical agents whatsoever. Paint removal is achieved solely through pyrolysis. This method is more environmentally friendly and offers superior metal recovery efficiency.

Aluminium Product Paint Removal Process Flow

Pre-treatment Stage: Scrap aluminium products are first cut into 5-8cm fragments using a crusher. Aluminium and iron are then separated via a magnetic separator.
Pyrolysis Stage: The aluminium fragments are conveyed to the carbonization paint removing furnace. They are heated to approximately 500°C in a high-temperature, oxygen-depleted environment. Pyrolysis duration: 20-30 minutes. Paint layers fully decompose into gases such as CO₂ and H₂O. An extremely thin oxide film forms on the metal surface.
Screening stage: Post-pyrolysis fragments are cooled via a cooling machine before discharge. Material undergoes further purification using an eddy current separator to extract aluminium. Final products comprise clean aluminium and iron shavings, suitable for direct remelting into new ingots.

Technical Advantages of Aluminium Paint Removal

High Metal Recovery Rate: Aluminium purity exceeds 99%, with negligible magnet loss. Compared to traditional incineration, metal oxidation loss is reduced by 80%.
Environmental and Energy Efficiency: No wastewater discharge throughout the process. Purified exhaust gases contain VOCs below 50mg/m³, meeting international emission standards. Energy consumption per tonne of aluminium processing is approximately 200-300kWh.
High Automation: Utilises a PLC intelligent control system enabling continuous production. Daily processing capacity reaches 20-30 tonnes, with customisable output according to client requirements.

The aluminium product pyrolysis paint removal plant achieves over 99% aluminium can recovery rates. It is projected to reduce paint pollutant emissions by 200 million tonnes annually. Concurrently, it conserves bauxite mining volumes. With the global promotion of circular economy policies, aluminium carbonization paint removing furnace are entering a period of rapid development. Should you wish to learn more about aluminium paint removal processes, please do not hesitate to contact us.