脱硫石膏晶体形貌控制实验研究

Experimental Study on Controllable Morphology of FGD Gypsum Crystal

摘要: 针对湿法烟气脱硫过程中的工况参数，就反应温度、体系pH值以及脱硫剂的浓度等因素对脱硫石膏晶体形态的影响进行了实验研究。结果表明，随着反应温度的升高，脱硫石膏晶体的形貌由板状向条状、棱柱状发展，晶体的{010}面活性得到增强；随着pH值的升高，脱硫石膏晶体形貌从短板状到棒状再到板状发展，合适的pH值是获得六棱柱状石膏晶体的重要保障；脱硫剂的浓度增大，石膏晶体形貌基本不变，但粒径有所增大，同时出现更多的细小的半水亚硫酸钙颗粒。

Abstract: The effects of reaction temperature, pH value and concentration of desulfurizer on crystal morphology of FGD gypsum were studied referring to the operating parameters of wet flue gas desulfurization. The re-sults show that the morphology of FGD gypsum crystals developed from plate to strip and prismatic shape on account of the activity of the {010} crystal planes were enhanced with the increase of reac-tion temperature. With the increase of pH value, the morphology of FGD gypsum crystals grew from short plate to rod and then to plate. It is important to obtain hexagonal prism gypsum crystal by controlling suitable pH value. The concentration of desulfurizer slurry played an unimportant role in effecting on the morphology of gypsum crystal. The gypsum particles grew accompanied by more tiny semi-aqueous calcium sulfite particles with the increase of the concentration of desulfurizer slurry.