Abstract
This article examines the problem of finding new “dry” methods of recovering particles of nonferrous metals from nonmagnetic fractions of solid industrial and municipal wastes while saving water resources and reducing pollution. The methods also separate particles of different metals from one another based on their electrical conductivity, and they yield high-purity (97–99.5%) copper, aluminum, and lead concentrates for metallurgical conversion. The article discusses the possibilities of the electrodynamic separation of nonferrous metals in high-gradient fields of high-frequency current – high-frequency electromagnetic fields. Results are presented from experimental studies of the recovery of nonferrous metals from nonmagnetic fractions of crushed cable scrap and electrical scrap within the coarseness range –20+5 mm and the separation of these metals from one another on the basis of their electrical conductivity. The important social problems of protecting the environment and saving water and energy resources are solved by using this method: the production of high-quality secondary raw materials for metallurgical conversion makes it possible to recycle valuable commercial products – high-purity nonferrous metals – while also protecting the environment from these dangerous eco-toxins.
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