脱硫石膏和磷石膏作调凝剂对水泥性能影响的对比研究  

作　　者：何廷树[1] 马晓东 田悦 荆彤 

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055

出　　处：《中国水泥》2024年第2期62-67,共6页China Cement

摘　　要：使用工业副产脱硫石膏和磷石膏替代天然石膏作水泥调凝剂,是大量消纳这些固废的有效途径之一。有鉴于此,本文在对硫石膏和磷石膏理化性质研究的基础上,系统对比研究了两类石膏作调凝剂对水泥性能的影响,结果表明:脱硫石膏呈中性,但磷石膏来源不同,可呈强酸性、中性和强碱性。试验所用四种石膏的F、P、重金属浸出特性和反射性均满足一类建材的要求。脱硫石膏所配水泥的性能稳定性较好,掺量波动对水泥性能影响也较小,但磷石膏杂质成分复杂,所配水泥的凝结时间较长,一般为脱硫石膏所配水泥凝结时间的二倍以上。磷石膏产地和掺量变化对所配水泥的凝结时间和强度影响较大,使用过程中需严格控制掺量,否则会导致水泥不合格。Using industrial by-products such as desulfurization gypsum and phosphogypsum to replace natural gypsum as cement setting agents is one of the effective ways to consume a large amount of these solid wastes.Given this,based on the study of the physical and chemical properties of sulfur gypsum and phosphorus gypsum,this article systematically compares the effects of two types of gypsum as setting agents on the performance of cement.The results show that desulfurization gypsum is neutral,but phosphorus gypsum comes from different sources and can exhibit firm acidity,neutrality,and strong alkalinity.The F,P,heavy metal leaching characteristics,and reflectance of the four types of gypsum used in the experiment all meet the requirements of a building materials class.The performance stability of the cement mixed with desulfurization gypsum is good,and the dosage fluctuation has a small impact on the cement performance.However,the impurity composition of phosphogypsum is complex,and the setting time of the cement mixed with desulfurization gypsum is generally more than twice that of the cement mixed with desulfurization gypsum.The changes in the origin and dosage of phosphogypsum significantly impact the setting time and strength of the mixed cement.The dosage needs to be strictly controlled during use.Otherwise,it will lead to unqualified cement.

关 键 词：脱硫石膏 磷石膏 杂质 水泥调凝剂 水泥性能 

分 类 号：TQ172.462[化学工程—水泥工业]