Process Analysis and Improvement for Enhancing Rhodium Dissolution Rate

This study focuses on optimizing the processing of a Rhodium-containing feedstock with the aim of enhancing its final dissolution and subsequent recovery at Heraeus Precious Metals. It was carried out within the broader context of the importance of recycling of Critical Raw Materials. A description of the primary production process of Rhodium is provided, alongside a discussion of supply and demand dynamics, the factors that contribute to its criticality, and the implications for the broader sustainability of the Precious Metals industry. The research involved a comprehensive examination from multiple perspectives. On one hand, process performance was evaluated through the calculation of the carbon footprint and analysis of historical data of operations. On the other hand, it investigated the influences of the initial feedstock, through in-depth characterization employing several analytical techniques, and of the H2 reduction temperature, through trial tests on the equipment. By examining these factors, the goal was to identify optimal conditions that would lead to improved First Pass Yield of the process. Given the inherent variability in feedstock composition, the identification of specific ideal parameters proved challenging. However, the findings and suggestions from this research have contributed to the broader objectives of advancing sustainability practices and resource efficiency within the company.