中文摘要：

研究了复合型缓凝剂P粉对脱硫建筑石膏水化进程、液相离子浓度与过饱和度及二水石膏晶体形貌的影响,结合扫描电镜对其缓凝机理进行了分析。结果表明：P粉能抑制脱硫建筑石膏的早期水化,使其水化放热减缓,早期水化率降低,凝结时间延长;P粉对二水石膏晶体形貌影响较大,并且使二水石膏晶体尺寸明显增大;P粉通过多种途径对石膏产生了缓凝作用,其中羟基羧酸钙盐钙离子的电离对早期半水石膏的溶解起到一定的阻碍作用,延缓了晶核的形成,同时羧基和羟基组成的基团的选择性吸附抑制了晶核的生长,另外蛋白质也对石膏起到了胶体包裹的作用,抑制了晶核的长大。

英文摘要：

The effect of compound retardant powder P on the hydration process,ion concentration in liuquid and supersaturation degree,and crystal morphology of dehydrate of FGD building gypsum is investigated.Furthormore,by using the SEM,its retarding mechanism is also studied.The results indicate that the addition of powder P retardant the early hydration of FGD building gypsum,which leads to delay of hydration heat evolution.It can also decrease the hydration ratio at early stage and prolong induction period of FGD building gypsum.Powder P has a major effect on the crystal morphology of dehydrate,moreover it enlarges crystal sizes.Retardation effect of powder P is worked by a variety of ways.The ionization of calcium ion from the hydroxyl carboxylic acid calcium salt definitely impedes the early dissolution of hemihydrate FGD building gypsum,delay the formation of nucleus.Also the selective absorption of groups composed of carboxyl and hydroxyl inhibits the growth of nucleus.Moreover the protein also plays a colloid coated role for gypsum,inhibiting the growth of nucleus.