Zinc Die Cast Scrap Treatment Steps

Handling zinc die-cast scrap requires a systematic approach to ensure effective management and recycling. Follow these detailed steps to deal with zinc die-cast scrap properly:

Treatment Steps

Collect and Segregate

Gather zinc die-cast scrap from manufacturing processes, end-of-life products, or other relevant sources.

Separate the scrap into different categories based on composition, such as pure zinc die-cast scrap, contaminated scrap, or mixed alloy scrap.

Zinc alloy raw material

Analyze the Scrap

Conduct a thorough analysis of the collected zinc die-cast scrap to determine its composition, including the percentage of zinc and other alloying elements.

Use techniques like X-ray fluorescence (XRF) or optical emission spectroscopy (OES) to identify the elemental composition of the scrap.

Sort and Clean

Sort the die-cast zinc scrap based on composition and level of contamination.

Remove contaminants and impurities like dirt, oils, paints, or non-metallic materials.

Employ mechanical scrubbing, chemical treatments, or thermal processes to clean the scrap, depending on the type of contamination.

Melt and Refine

Heat the cleaned zinc die-cast scrap in a melting furnace until it reaches its melting point of approximately 419°C (786°F) for pure zinc.

Add suitable fluxes, like chloride-based or borax, to remove any remaining impurities or oxides from the molten metal.

Adjust the temperature and chemical composition to achieve the desired alloy composition.

Cast or Solidify

Pour the refined molten zinc into moulds or casting machines to create new zinc die-cast products.

Use appropriate casting techniques, such as gravity or high-pressure die casting, based on the specific product requirements.

Finish and Perform Quality Control

Apply necessary finishing processes to the newly cast zinc die-cast products, including trimming, deburring, machining, and surface treatments.

Conduct quality control inspections to ensure the final products meet required specifications and standards.

Consider Recycling and Environmental Impact

Implement a closed-loop recycling system, where scrap generated during manufacturing is recycled back into the production cycle.

Comply with local environmental regulations and guidelines for proper handling, storage, and disposal of waste materials generated during recycling.

Common Sources of Zinc Die Casting Scrap

Manufacturing Operations

Scrap is generated during the production of zinc die cast products. This includes rejected or defective parts, excess material from trimming or machining processes, and metal leftovers from casting operations.

End-of-Life Products

Zinc die cast components are used in a wide range of industries, such as automotive, electronics, and consumer goods. When these products reach the end of their life cycle, they are often disassembled or discarded, resulting in zinc die cast scrap.

Metal Machining and Fabrication

Zinc die cast scrap may also be produced during secondary operations, such as machining, drilling, or welding, where excess material or unwanted parts are generated and subsequently discarded.


The treatment of zinc die casting scrap is to be collected and segregated, and then the collected scrap is sorted and cleaned. After the cleaned scrap is melted and refined, it can be used to make new die castings. Zinc die casting scrap generally comes from scrap generated during the manufacturing process or scrapped products and excess materials generated during metal processing.

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