The pretreatment of waste non-ferrous metals refers to the process of transforming the state of waste non-ferrous metals into an effective follow-up metallurgical process. This process includes: making all kinds of waste parts and wastes meet the specified dimension and weight standards; separating non-ferrous metals from ferrous metals; removing non-metallic inclusions, moisture, oil quality, etc. The fine and high-quality preparation of the waste non-ferrous metals can be applied to the metallurgical process, minimize the loss of non-ferrous metals, reduce the unit consumption of fuel, electricity and flux, effectively utilize the metallurgical equipment and transportation tools, and improve the productivity of labor and the quality of non-ferrous metals and alloy products.
The pretreatment of non-ferrous metal scrap and waste includes the following main processes: sorting, cutting, packing, briquetting, crushing, grinding, magnetic separation, drying, oil removal, etc. Special production line is adopted for pretreatment of special regenerative raw materials (waste battery, waste motor, waste wire, scrap tinplate). The research and Design Institute of renewable non ferrous metals in Jiangsu Province has developed a general process flow for the pretreatment of waste non-ferrous metals, which starts from the introduction of non-ferrous metal scrap and waste into the workshop and ends at the delivery of finished products to the user's factory.
The purpose of packing is to compact the loose and light waste parts with the waste materials and make them into packing blocks of certain weight, size and density. Dense materials are easy to be charged for smelting, and the metal loss caused by oxidation during smelting is also small. At the same time, the transportation cost of raw materials can be reduced. What needs to be packed and processed are large-scale waste parts, waste radiators, cutting edges, waste bars, waste pipes, waste cables, waste stator windings, debris, waste pressure molds, daily waste products, etc. The density of the processed packing block depends on the pressure and the thickness of the pressed material. For scrap copper packing, 2000-4500kn pressure is required, and for scrap aluminum packing, 1400-2000kn pressure is required.