Optimization of conditions to convert phosphogypsum into Ca(OH)2 and Na2SO4

Abstract

With a view to finding solutions to the problems of Moroccan phosphogyosum (PG) in the long term, a research theme has been developed in our laboratory on the valorization of this residue by its conversion into marketable products by soft chemistry way less expensive. Thus, we investigated the optimal experimental conditions allowing a good efficiency of PG conversion by using NaOH to synthesize marketable products such as Ca(OH)₂ and Na₂SO₄ of high purity. We varied the reagent concentrations and the attack durations to optimize these conditions. The quality of the products obtained is checked by XRD, IR and ICP to determine the distribution of PG impurities between obtained products. The morphology and size distribution were also established by SEM and laser granulometry.