Important results from the project
The project has achieved its objective by developing and optimizing a process for recycling pyrite waste and gypsum into lime, iron and sulfur products. A simplified two-step process was developed that enables direct reduction of pyrite, which improves efficiency and reduces energy requirements. The project has also led to new initiatives, including a project application for gypsum valorization with LKAB Minerals and Cemvision, which contributes to increased circularity and resource efficiency.
Expected long term effects
The project is expected to have a major impact on sustainable mining by enabling the circular use of pyrite tailings and waste gypsum. It contributes to reduced CO₂ emissions, reduced waste and reduced need for primary raw materials such as limestone. The results create good conditions for pilot and industrial implementation as well as new value chains, and support the transition to a resource-efficient and fossil-free industry.
Approach and implementation
The project was implemented in interconnected work packages, starting with thermodynamic modeling followed by gram and ~200 g trials with continuous follow-up from industrial partners. The implementation followed the plan and schedule broadly. Products were evaluated for clinker application at Heidelberg Materials and a techno-economic analysis was performed by Boliden. The collaboration worked well and enabled efficient integration and validation.
External links
The project description has been provided by the project members themselves and the text has not been looked at by our editors.
