Abstract
Industrial wet phosphoric acid production in Huelva (SW Spain) has led to the controversial stockpiling of waste phosphogypsum (PG) byproducts, resulting in the release of significant quantities of toxic impurities in salt marshes in the Tinto river estuary. A twofold objective is proposed: removing hazardous and unpleasant wastes and mitigating the emission of greenhouse gases into the atmosphere. Thus, the first aim of this research is to synthesize materials with the ability for CO2 sequestration from wastes as preliminary work for designing industrial processes, which involve a reduction of CO2 emissions. In this regard, PG from the fertilizer industry, soda solutions, and liquid alkaline wastes from aluminum industries have been considered as precursors. Our results demonstrate the high efficiency of portlandite precipitation by PG dissolution using alkaline solutions. Carbonation experiments performed at ambient pressure and temperature resulted in total conversion of the portlandite into carbonate, confirming that it may act as a carbon sequestration agent. Therefore, wastes, which are unable to fix CO2 by themselves, can be successfully turned into effective CO2 sinks.
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