Fractionation and fluxes of metals and radionuclides during the recycling process of phosphogypsum wastes applied to mineral CO2 sequestration

摘要: The industry of phosphoric acid produces a calcium-rich by-product known as phosphogypsum, which is usually stored in large stacks millions tons. Up to now, no commercial application has been widely implemented for its reuse because the significant presence potentially toxic contaminants. This work confirmed that up 96% calcium phosphogypsum could be recycled CO2 mineral sequestration by simple two-step process: alkaline dissolution and aqueous carbonation, under ambient pressure temperature. process based on recycling wastes would help mitigate greenhouse gasses emissions. Yet this goes beyond validation procedure; it tracks contaminants, such trace metals or radionuclides, during phosphogypsum. Thus, most contaminants were transferred from raw portlandite, obtained soda, portlandite calcite carbonation. These findings provide valuable information managing designing potential technological applications by-products environmentally–friendly proposal.