Closing metal loops sustainably - opportunities & challenges for a successful circular economy

Speaker: Dr. Christian Hagelüken

Host: on invitation of Prof. Dierk Raabe

Metals play a key enabling role as well for climate protection technologies such as electro mobility, the hydrogen economy, solar and wind power plants, and also for digitalization and electronic products. Accordingly, it is necessary to make their use along the entire metals and products lifecycle much more resource-efficient than before. Closed metal cycles contribute to this by securing relevant parts of the raw material supply for high-tech products and by reducing CO₂-emissions in their production at the same time.

Circular economy (CE) has therefore rightfully become an important topic for industrial policy and economic strategies. Recycling, i.e., the continued loop-closing by physically (re)using recycled materials within the economy, is one of the leverage points together with other CE strategies such as longevity, intensity of use, and a sharing economy. In order to evaluate the contribution of recycling to sustainable resource use and climate protection, it is necessary to clearly define the system under investigation including the system boundaries, and to derive target-compliant definitions, calculation approaches, and indicators to verify the contribution of recycling to such overarching targets. Furthermore, an understanding of the opportunities and limitations of recycling and CE to achieve environmental, economic, and socio-economic goals is required.

The lecture focuses in particular on the recycling of metals. Interacting steps in logistics and multistage treatment processes by mechanical and chemical-metallurgical unit operations are challenging but will give a competitive advantage for networks of industry and science that are able to handle that. In this context, high-quality recycling of complex products means the economically viable recovery of many relevant metals and materials with high yields, in marketable quality and in compliance with high environmental and social standards. We will explore the fundamentals of metals recycling and have as well a critical view on sometimes too simplistic CE approaches, which in practise do not fit the purpose. In conclusion, setting up a true circular economy for metal containing products requires fundamental changes in the way we develop, design, produce, distribute, use & recycle products.

Registration: https://plan.events.mpg.de/event/500/

The colloquia series is organized by of the International Max Planck Research School on Sustainable Metallurgy (IMPRS SusMet)