Abstract
Abstract Phosphogypsum (PG) or chemical gypsum is a by-product generated in the manufacture of phosphoric acid. The world production estimated to 200 million tons per year (in Morocco 8 million tons per year) induces environmental threats and storage problems, which requires strict policies to limit pollution and encourage its valorisation. The purpose of this paper is to investigate the thermodynamic condition of the desulfurization process of phosphogypsum (PG). Theoretical approach and experimental setup were validated by using the actual data from desulfurization of PG. Theoretical results showed chemical decomposition of phosphogypsum is thermodynamically feasible only at low temperatures using the HSC chemistry 6.1 computer tool.
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