磷石膏保温砂浆的制备

为实现工业废渣磷石膏的再利用，将其预处理、煅烧(蒸压)制得建筑（高强）石膏，然后与水泥、硅灰一起作为胶凝材料，配合玻化微珠轻质骨料制备半水石膏基无机保温砂浆；以生石灰作为碱性激发剂，通过单因素实验，比较分析磷石膏含量、硅灰含量、骨胶比以及磷石膏处理工艺对砂浆抗压强度、导热系数、吸声等性能的影响.结果表明:经处理过的磷石膏（半水石膏）可直接作为胶凝材料使用，配制的保温砂浆最佳配合比（质量比）为磷石膏/水泥=0.80，骨胶质量比为1∶1，硅灰占胶凝材料总量的20%；砂浆的导热系数≤0.054 W/(m·k)，干表面密度≤0.35 g/cm3，抗压强度＞0.3 MPa，达到了国家标准保温砂浆性能要求.

Preparation and characterization of phosphogypsum thermal insulation mortar

To utilize phosphogypsum industrial waste residue,the high-strength building gypsum pre-pared by pretreatment and calcination（autoclave）was used for cementitious materials with cement and silica fume.This cementitious materials with glazed hollow bead were used for preparing inorganic thermal mortar,while quick lime was alkali-activator.The effects of content of phosphorus gypsum and silica fume,bone-glue ratio and preprocessed technology of phosphogypsum on compressive strength,thermal conductivity,sound absorption coefficient of thermal mortar were analyzed by single factor experiment.The results show that the phosphogypsum after pretreatment can be used as cementitious materials directly; the optimum proportion of thermal mortar is phosphogypsum/cement =0.80,aggregate/ cementing material=1,and silica fume/cementitious materials=0.20.Under this condition,the thermal conductivity and the dry apparent density of thermal mortar are less than 0.054 W/（m · k） and 0.35 g/cm3 respectively,and the compressive strength is more than 0.3 MPa,which meets government standard of thermal mortar.