(214a) Raman Spectroscopy for Monitoring Particle Size in Complex Slurries for Nuclear Waste Management

This work investigates the potential of Raman spectroscopy as a tool for determining solid particle properties within slurries, with an emphasis on particle size. Slurries, common in industries such as chemical, pharmaceutical, and nuclear waste management, present challenges in monitoring and understanding solid-state properties during processing. Raman spectroscopy, traditionally utilized for qualitative and quantitative material analysis, shows promise in providing insights into solid properties within slurries. The research proposes a novel approach of using Raman spectroscopy to assess particle size by monitoring the attenuation of a solution phase signal in the presence of added solids. Simulated high-level waste slurries resembling those at Hanford are employed, with silica solids of varying particle sizes introduced into an alkaline solution. Continuous monitoring of Raman signal attenuation allows for the modeling of particle size prediction. While complexities may arise in multicomponent systems, this approach holds particular promise for crystallization systems, where understanding particle properties like size is critical for quality control. Employing Raman spectroscopy as a singular tool for discerning particle size, alongside its conventional role in compound quantification, offers a cost-effective strategy for investigating critical particle properties within slurries.