硅酸盐水泥改性磷建筑石膏砂浆性能研究  

Study on properties of building phosphogypsum mortar modified by Portland cement

作　　者：朱丽苹 ZHU Liping(School of Chemistry and Environmental Sciences,Qujing Normal University,Qujing Yunnan 655011,China)

机构地区：[1]曲靖师范学院化学与环境科学学院,云南曲靖655011

出　　处：《化工矿物与加工》2020年第3期48-50,55,共4页Industrial Minerals & Processing

基　　金：云南省教育厅项目(2018JS450,2019J0604);曲靖师范学院校级项目(2013QN0274)。

摘　　要：以云南某地磷化工副产品磷石膏为主要原料,通过焙烧制备建筑石膏粉,再添加水泥原料制备石膏基砂浆产品。通过石膏砂浆的稠度、凝结时间、抗折抗压强度试验,采用电子显微镜(SEM)观察产品的微观结构并进行机理分析,分别研究了缓凝剂、玻璃短切纤维、硅酸盐水泥对轻质抹灰砂浆性能的影响,结果表明:蛋白类缓凝剂SG-12效果最好,最佳掺量为0.2%,初凝时间大于60 min;3 mm玻璃短切纤维最佳掺量为0.3%,抗折强度达8.50 MPa,较未添加时提高了150%;P·O 42.5水泥最佳掺量为10.0%,24 h抗折强度达3.9 MPa,24 h抗压强度达15.4 MPa,3 d抗折强度达5.6 MPa,3 d抗压强度达16.8 MPa,28 d抗折强度达7.3 MPa,28 d抗压强度达20.2 MPa。试验制备的石膏基轻质抹灰砂浆指标均超过国家标准,为磷石膏的开发利用提供了技术支持。With phosphogypsum, a byproduct of phosphate chemical plant in Yunnan as the main raw material, gypsum based mortar products were produced by preparing building gypsum powder by calcination with addition of cement. The microstructure of the products was observed and the mechanism was analyzed by electron microscope(SEM) in consistency, setting time and flexural strength and compressive strength tests of gypsum mortar.The effects of retarder, glass fiber and Portland cement on the properties of lightweight plastering mortar were studied.The results showed that protein retarder SG-12 has the best effect, with the optimal dosage of 0.2% and the initial setting time of more than 60 min;the optimal dosage of 0.3% for 3 mm glass fiber and the flexural strength up to 8.50 MPa,a 150% increase compared to no addition.The optimal dosage is 10.0% for the P·O 42.5 cement with 24 h flexural strength up to 3.9 MPa and 24 h compressive strength up to 15.4 MPa, 3 d flexural strength up to 5.6 MPa,3 d compressive strength up to 16.8 MPa,28 d flexural strength up to 7.3 MPa and 28 d compressive strength up to 20.2 MPa. The indexes of gypsum-based lightweight plaster mortar prepared by tests are above the national standard, which provides technical support for the development and utilization of phosphogypsum.

关 键 词：磷建筑石膏 轻质砂浆 SEM电镜 硅酸盐水泥 玻璃纤维 蛋白类缓凝剂 强度试验 

分 类 号：TQ177.373[化学工程—硅酸盐工业]