1.What are the collection and pretreatment steps in the workshop?
Online Automated Recycling: Modern large-scale stamping lines are often equipped with waste conveyors and balers, which automatically collect and compact strips and sheets into high-density bales. This method is highly efficient, requires little space, and offers good safety.
Offline Centralized Collection: Small and medium-sized workshops typically use waste bins and hoppers for collection, periodically transferring the waste to a centralized point.
Best Practices:
Strict Classification: Waste should be stored separately according to material (e.g., ordinary carbon steel, stainless steel, galvanized sheet, aluminum), thickness, and cleanliness (whether it contains oil or coatings). Mixed waste has the lowest value.
Timely Removal: Prevent waste accumulation and ensure safety and 5S compliance.
Compression Baling: Baling reduces volume by up to 70%, significantly lowering transportation and storage costs and is a key factor in increasing selling price.
2.Who are the main buyers?
Large steel mills: These are the most efficient end-users. They possess advanced crushing and sorting equipment, enabling them to directly feed clean, well-sorted stamping waste into their furnaces as high-quality "furnace feed."
Professional scrap steel recycling traders: As intermediaries, they collect, process, and then resell the scrap to steel mills. Choosing a reputable recycler with strong processing capacity is crucial.
Small recycling stations: These typically offer lower prices and are suitable for processing small volumes or mixed scrap.
3.What is the pricing mechanism?
Market-driven: Prices are closely linked to steel futures prices and regional market supply and demand, and fluctuate significantly.
Weight-based pricing: Settlement is based on tons.
Weight deductions: If scrap contains oil, paint, or other impurities, a deduction will be made proportionally or the price will be reduced.
4.What are the specialized processing techniques?
Crushing: Large pieces of waste are crushed into smaller, uniform pieces for easier magnetic separation and smelting.
Sorting:
Magnetic Separation: Separates ferromagnetic materials (steel, iron) from non-magnetic materials (aluminum, copper, rubber).
Edge Current Separation: Separates non-ferrous metals.
Manual/Visual Separation: Ensures purity.
Coating/Degreasing: Some high-end processing lines use high-temperature or chemical methods to remove surface coatings and oil, improving material purity.
5.What are the precautions for handling special waste materials?
Coated/plated waste (e.g., galvanized and aluminized zinc sheets):
Zinc and aluminum coatings are impurities in steelmaking and must be treated by specialized dust removal and environmental protection equipment at the steel mill. This type of waste is cheaper than uncoated waste.
Oil-containing waste:
Oil contamination produces fumes and harmful gases during smelting. Steel mills strictly control this or treat it at a reduced price. Mixing it with cutting fluid, emulsions, or other hazardous waste is strictly prohibited; otherwise, it will be treated as hazardous waste, incurring extremely high costs.
Stainless steel and special alloy waste:
Must be recycled separately; its value is far higher than that of ordinary carbon steel. Mixing it with ordinary carbon steel will severely damage the value of both.
Scrap and debris:
Excessively fine waste (such as "hair scraps" from stamping) has low recycling value and is easily oxidized. Special care must be taken in collection and packaging to prevent spontaneous combustion.