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Guan Q J, Sun W, Hu Y H, et al. Synthesis of α-CaSO 4· 0.5 H 2 O from flue gas desulfurization gypsum regulated by C 4 H 4 O 4 Na 2· 6H 2 O and NaCl in glycerol-water solution[J]. RSC Advances, 2017, 7(44): 27807-27815

2017-07-24 17:54   审核人:   (浏览次数)

A brand new method to transform flue gas desulfurization gypsum (FGD gypsum) into α-calcium sulfate hemihydrate (α-HH) with short hexagonal prisms mediated by succinic acid disodium salt hexahydrate (C4H4O4Na2·6H2O) and NaCl in glycerol-water solution is studied, in which the appropriate reaction temperature is 90 °C. The addition of NaCl facilitates the dissolution of calcium sulfate dihydrate (DH) and creates much higher supersaturation which is a greater driving force for the phase transformation from DH to α-HH. C4H4O4Na2·6H2O as the crystal modifier effectively suppresses the α-HH crystal growth along the c axis, and the products generally change from needle-like particles to fat and short hexagonal prisms, which is attributed to the preferential adsorption of C4H4O42− on the top facets of the crystals by chelating Ca2+.

http://pubs.rsc.org/en/content/articlehtml/2017/ra/c7ra03280c

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