半水磷石膏粒径对砌块显微组织和强度的影响  

Effect of Particle Size of Hemihydrate Phosphogypsum on the Microstructure and Strength of Gypsum Blocks

作　　者：庄林林[1] 王凌云[1] 丁明[2] 张继黎 

机构地区：[1]合肥学院生物与环境工程系,安徽合肥230601 [2]合肥学院化学与材料工程系,安徽合肥230601 [3]安徽森科新材料有限公司,安徽合肥230022

出　　处：《安徽化工》2015年第5期40-43,45,共5页Anhui Chemical Industry

摘　　要：采用机械破碎结合震动筛分方法获得了几种粒径分布半水磷石膏粉体。在养护温度及水膏比相同的条件下，用不同粒径半水磷石膏粉制备出了相应的砌块。研究表明，随着半水磷石膏粒径的减小，胶凝后的砌块强度先升高后降低。当半水磷石膏粒径约为45～75μm时，获得的砌块抗折和抗压强度均达到最大值，分别为4．06MPa和16．93MPa。粒度变化影响最终砌块微结构是导致强度变化的根本原因。Hemihydrate phosphogypsum powders with different sized-distribution have been prepared by a grinding-broken method combined with shake screening in this paper. Phosphorus gypsum blocks were fabricated using different particle size hemihydrate phosphogypsum powders at the same curing temperature. Experimental results showed that the strength of as-prepared phosphogypsum blocks increased firstly and then decreased with the decrease of particle size of hemihydrate phosphogypsum powders. When the particle size of hemihydrate phosphogypsum is about 45 μm to 75 μm, the flexural and compressive strength of blocks reached maximum values （ca. 4.06MPa and 16.93MPa, respectively）. Microstructural reconstruction induced by particle size and its distribution is the key influence to the strength improvement of as-obtained gypsum blocks.

关 键 词：半水磷石膏 石膏砌块 显微组织 强度 影响 

分 类 号：X754[环境科学与工程—环境工程]