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Phosphoanhydrite was obtained by processing dihydrate phosphogypsum generated   during phosphoric acid production at Joint Stock Company (JSC) Lifosa   (Lithuania). The influence on the properties of phosphoanhydrite of the   treament process’ parameters was determined, including the conditions of   phosphogypsum neutralisation in the lime suspension; temperature and duration   of calcination of neutralized phosphogypsum to phosphoanhydrite; fineness of   ground anhydrite; selection of additives activating the hydration of   anhydrite and their amounts. Upon adding activators of anhydrite hydration,   K2SO4 or Na2SO4, the data of XRD and IR spectral analysis show that the   specimens after 1 day of phosphoanhydrite hydration with additives contain   complex salts - syngenite upon using K2SO4 additive and glauberite in the   case of Na2SO4 additive. These additives act as crystallization centers and   accelerate hydration. It has been determined that the specimens of   phosphoanhydrite calcined at a temperature of 900 º C with 2 % K2SO4 additive   have the best physical and mechanical properties. Already after 1 day of   hardening the specimens acquired a compressive strength of 21.18 MPa, and   after 28 days of hardening they had a compressive strength of 58.5 MPa (dry   specimens)

Influence of the setting activators on the physical mechanical properties of phosphoanhydrite