脱硫建筑石膏缓凝剂的研究

摘要

This paper mainly studied the influence of various gypsum retarders on the setting time and absolutely dry strength of FGD gypsum. The results show that there are different effects on the performance of the building gypsum for different retarders. Citric acid and malic acid can effectively delay the gypsum coagulation. At the same time,they also can cause the significant degree of loss of the strength. Sodium tripolyphosphate and sodium hexametaphosphate have a certain retarding effect on the FGD gypsum,but they cannot meet the construction requirements. Although glycerin and sucrose can delay cement setting time,they don't have any delayed coagulation effect on the FGD gypsum. Overall performance of compound retarder is better than any retarder for the building gypsum.%主要研究了多种缓凝剂对脱硫建筑石膏凝结时间和绝干强度的影响.结果表明,不同类型的缓凝剂对脱硫建筑石膏性能的影响各不相同:柠檬酸和苹果酸能有效地延缓石膏的凝结,但对石膏硬化体的强度影响较大;三聚磷酸钠和六偏磷酸钠对石膏有一定的缓凝效果,但不能满足施工要求;丙三醇和蔗糖虽然能延缓水泥凝结,但对石膏基本无缓凝作用;复合缓凝剂对脱硫建筑石膏的综合效果较好.