Optimized use of biochar and metallic residues for efficient production of cast iron

Purpose and goal

The project aims to improve resource efficiency and reduce carbon emissions in the foundry industry through sustainable use of residual materials. The goal is to develop briquettes from biochar and metallic residuals such as mill scale, filter dust and sawdust. A feasibility study maps the materials´ chemistry, quantity, binders, and safety aspects for biochar. The study also investigates best practices for briquette use in induction furnaces and lays the foundation for a future project.

Expected effects and result

The project results are expected to have a significant impact on the foundry industry through increased resource efficiency and resilience. By optimizing raw material, including scrap, recycled material, briquettes with mill scale and biochar, the need for imported pig iron can be reduced, strengthening the industry´s resilience to global disruptions. The project increases the understanding of differences between fossil and renewable carbon sources and promotes sustainable production processes.

Planned approach and implementation

The feasibility study will be carried out in several steps: first, data on biochar and metallic residues are collected, followed by an evaluation of binders and analyzes of chemical composition, reactivity and reaction kinetics. A technical specification is then developed for the briquetting process, including recommended methods for adding briquettes to induction furnaces. Finally, the results are summarized in a report that is the basis for decisions about a possible research project.