磷石膏制备β半水石膏粉的研究  

Preparation of β-hemihydrate gypsum with phosphogypsum

作　　者：郑绍聪[1,2] 余强[1] 宁平[3] 马金波[3] 郑远利 

机构地区：[1]云南冶金集团股份有限公司技术中心,云南昆明650031 [2]曲靖师范学院,云南曲靖655011 [3]昆明理工大学环境科学与工程学院,云南昆明650093

出　　处：《现代化工》2015年第5期60-63,65,共5页Modern Chemical Industry

基　　金：国家自然科学基金资助项目(E0415)

摘　　要：研究了磷石膏制备半水石膏粉的工艺条件,通过添加减水剂改善磷建筑石膏的力学性能。采用常规分析、XRD和扫描电镜等方法对磷石膏原料、磷建筑石膏粉和石膏产品进行分析和表征。结果表明:在温度为180℃和焙烧时间为2.0 h条件下,磷建筑石膏粉β半水石膏质量分数达到75.24%,绝干抗压强度达到9.6 MPa;建筑石膏强度随着减水剂掺量的增加而升高。聚羧酸减水剂掺量为0.7%时,绝干强度达到15.0 MPa,强度提高近64.84%;FDN减水剂掺量为0.7%时,绝干强度达到14.8 MPa,强度提高近62.64%;木质素减水剂掺量为0.7%时,绝干强度达到13.9 MPa,强度提高近52.75%。The process of β-hemihydrate gypsum with phosphogypsum as raw material is studied. The water-reducing agent is used to improve the mechanical property of building gypsum. XRD and scanning electron microscopy （SEM） are applied to characterize the phosphogypsum and gypsum product. The results show that when the phosphogypsum is baked at 180℃ for 2 hours,the concentration of β-hemihydrate gypsum reaches 75.24% and the compressive strength is 9. 6 MPa. The strength of building gypsum increases with increasing the content of superplasticizer. When the addition of polycarbosylic acid is 0. 7 wt%, the strength of building gypsum is 15.0 MPa and the strength is improved by nearly 64. 84%. When the concentration of FDN is 0. 7 wt% ,the strength of building gypsum is 14. 8 MPa and the strength is improved by nearly 62.64%. When the addition of lignin is 0.7 wt% ,the strength of building gypsum is 13.9 MPa and the strength is improved by nearly 52. 75%.

关 键 词：磷石膏 β建筑石膏粉 工艺控制 

分 类 号：X705[环境科学与工程—环境工程]