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In this study, a simple and efficient strategy is developed to synthesize rod-shaped α-CaSO 4 ·0.5H 2 O crystals with tunable aspect ratio from industrial phosphogypsum only in potassium tartrate aqueous solution at a low temperature. Industrial phosphogypsum can be effectively converted into rod-shaped α-CaSO 4 ·0.5H 2 O crystals with the assistance of potassium tartrate, and the aspect ratio of α-CaSO 4 ·0.5H 2 O crystals gradually decreases from 52 : 1 to 1 : 1 with increasing the concentration of potassium tartrate. The formation process of the rod-shaped α-CaSO 4 ·0.5H 2 O crystals in this system involves the dissolution of CaSO 4 ·2H 2 O and nucleation of α-CaSO 4 ·0.5H 2 O crystals. The tartrate ions from potassium tartrate in this system preferentially bind to (001) and (002) facets of α-CaSO 4 ·0.5H 2 O crystals, inhibiting the growth of α-CaSO 4 ·0.5H 2 O crystals along the c -axis and controlling its morphology and aspect ratio.

Aspect ratio-controlled preparation of α-CaSO4·0.5H2O from phosphogypsum in potassium tartrate aqueous solution

Aspect ratio-controlled preparation of α-CaSO₄·0.5H₂O from phosphogypsum in potassium tartrate aqueous solution