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首页> 外文期刊>RSC Advances >Synthesis of α-CaSO4·0.5H2O from flue gas desulfurization gypsum regulated by C4H4O4Na2·6H2O and NaCl in glycerol-water solution
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Synthesis of α-CaSO4·0.5H2O from flue gas desulfurization gypsum regulated by C4H4O4Na2·6H2O and NaCl in glycerol-water solution

机译：由C 4 H 4 调节的烟气脱硫石膏合成α-CaSO 4 ·0.5H 2 O甘油水溶液中的O 4 Na 2 ·6H 2 O和NaCl

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摘要

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+.
机译：一种由短短六方柱由琥珀酸二钠盐六水合物（C 4 < / small> H 4 O 4 Na 2 ·6H 2 O）和NaCl为研究对象，适宜的反应温度为90℃。 NaCl的添加促进了二水合硫酸钙（DH）的溶解，并产生了更高的过饱和度，这是从DH相转变为α-HH的更大驱动力。 C 4 H 4 O 4 Na < small> 2 ·6H 2 O作为晶体改性剂可有效抑制α-HH晶体沿 c的生长轴，并且产物通常从针状颗粒变为脂肪和短六边形棱柱，这归因于C 4 H 4 O 4 2？ 位于通过螯合Ca 2 + 形成晶体。

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