磷石膏制备煅烧硬石膏及性能研究  

Study on properties of type Ⅱ-anhydrous gypsum prepared by phosphogypsum

作　　者：王锦涛 陈德玉[1] 谢晓丽[1] 胡志华[1] 马焕入 WANG Jintao;CHEN Deyu;XIE Xiaoli;HU Zhihua;MA Huanru(School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学材料与化学学院,四川绵阳621010

出　　处：《新型建筑材料》2023年第8期74-78,共5页New Building Materials

基　　金：绵阳市科技城人才计划“涌泉计划”项目(2021YQ04W)。

摘　　要：通过中温煅烧制备煅烧硬石膏,分析了磷石膏在不同煅烧温度下得到的煅烧硬石膏标准稠度用水量、力学强度等物理性能,并采用物相分析、X射线衍射仪、扫描电镜以及激光粒度分析仪分析煅烧温度对煅烧硬石膏性能影响机理。结果表明:磷石膏在500℃下煅烧2 h得到的煅烧硬石膏性能最佳,标准稠度用水量为56%,28 d抗压强度为18.89 MPa,水化体二水石膏含量为75.3%。煅烧硬石膏物性受煅烧温度影响的原因为随着煅烧温度上升,Ⅱ型无水石膏相逐渐增加,β-半水石膏相逐渐减少,Ⅱ型无水石膏缺少β-半水石膏激发,造成水化率降低,强度降低,且Ⅱ型无水石膏随着煅烧温度升高,粒径增大,比表面积减小,造成稠度升高,强度提高。In this paper,calcined anhydrite is prepared by calcining at medium temperature.The physical properties of calcined anhydrite,such as water consumption for standard consistency and mechanical strength,obtained from phosphogypsum at different calcinations temperatures are analyzed.The mechanism of the influence of calcination temperature on the physical properties of calcined anhydrite is analyzed by phase analysis,X-ray diffraction(XRD),scanning electron microscopy(SEM)and particle size analyzer.The results show that the calcined anhydrite obtained by calcining phosphogypsum at 500℃for 2 h has the best performance,the water consumption of standard consistency is 56%,the compressive strength at 28 d is 18.89 MPa,and the content of hydrated dihydrate gypsum is 75.3%.The physical properties of calcined anhydrite are affected by the calcination temperature because the calcined anhydrite phase gradually increases with the calcination temperature,β-hemihydrate gypsum phase is gradually reduced,and II anhydrite is lackingβ-hemihydrate gypsum activation of hemihydrated gypsum will reduce the hydration rate and strength.With the increase of calcination temperature,the particle size of II anhydrite will increase and the specific surface area will decrease,which will increase the consistency and affect the strength growth.

关 键 词：磷石膏 Ⅱ型无水石膏 物相 

分 类 号：TU526[建筑科学—建筑技术科学]