The textbook is aimed at both students and participants of postgraduate courses in the field of recycling industrial metals, as well as operators of recycling facilities. A key focus of the content is the scientific presentation of applications for e-waste in accordance with the WEEE directive. This includes an explanation of the metals used in the products along with their physical effects. Naturally, recycling involves not only the organized collection and disassembly of devices but also the pyro- or hydrometallurgical processing of the recycled materials. The selection of known technologies and their further development require the presentation of relevant chemical knowledge about the metals. This is complemented by a section on spectroscopic methods for metal analysis. A comprehensive glossary makes the content accessible even to those with a technical interest.