磷石膏人造骨料组分优化及耐水性改善研究  

Study on Composition Optimization and Water Resistance Improvement of Phosphogypsum Artificial Aggregate

作　　者：陈洁 王再骞 黄绪泉[2,3,4,5] 钟颂 宋文峰 赵小蓉 薛菲[2,3,4] Chen Jie;Wang Zaiqian;Huang Xuquan;Zhong Song;Song Wenfeng;Zhao Xiaorong;Xue Fei(Hubei Yitong Construction Group Co.,Ltd.,Yichang,Hubei 443000;Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,China Three Gorges University,Yichang,Hubei 443002;College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang,Hubei 443002;Yichang Key Laboratory of Solid Waste Disposal and Resource Utilization,China Three Gorges University,Yichang,Hubei 443002;Hubei Province Enterprise-college Cooperation Innovation Center for Comprehensive Utilization of Phosphogypsum,Yichang,Hubei 443002)

机构地区：[1]湖北益通建设股份有限公司,湖北宜昌443000 [2]三峡大学三峡库区生态环境教育部工程研究中心,湖北宜昌443002 [3]三峡大学水利与环境学院,湖北宜昌443002 [4]三峡大学固体废物处置与资源化利用宜昌市重点试验室,湖北宜昌443002 [5]湖北省磷石膏资源化综合利用企校联合创新中心,湖北宜昌443002

出　　处：《非金属矿》2024年第1期88-92,共5页Non-Metallic Mines

基　　金：三峡库区生态环境教育部工程研究中心开放基金课题(KF2022-11、KF2023-07);宜昌市自然科学研究项目(A23-2-020)。

摘　　要：针对磷石膏占用大量耕地资源、易产生环境污染等问题,使用磷石膏、矿渣、粉煤灰、水泥等材料制备人造骨料推动磷石膏资源化利用。通过正交设计得到最佳配比:9%(质量分数,下同)矿渣粉,10%粉煤灰,5.5%水泥,75.5%磷石膏,并通过压制制备人造骨料。人造骨料28 d筒压强度最高可达7.2 MPa,1 h吸水率低于10%。分析其固化机理可知,胶凝体系各物料相互之间反应、物料激发部分磷石膏发生水化反应生成钙矾石、水化硅酸钙凝胶等水化产物,水化产物逐渐填充颗粒间空隙,颗粒间结合更加紧密使得磷石膏基骨料强度持续发展。采用直接掺混、预处理磷石膏、浸泡包衣3种不同改善方法对其开展耐水性能改善研究,发现采用防水剂OS时,不同处理方法均能改善骨料界面亲水性,其中包衣处理后接触角达到122.7°,骨料表面已为疏水状态。包衣处理对骨料强度影响小,可有效提升骨料各项耐水性能。In view of the problems that phosphogypsum occupies a large amount of cultivated land resources and is easy to produce environmental pollution,the artificial aggregate was prepared by phosphogypsum,slag,fly ash,cement and other materials to promote the resource utilization of phosphogypsum.Through orthogonal design,the optimal ratio was 9%slag powder,10%fly ash,5.5%cement,75.5%phosphogypsum,and artificial aggregate was prepared by pressing the raw materials.The maximum 28 d cylinder compressive strength of aggregate could reach 7.2 MPa,and the water absorption rate at 1 hour was less than 10%.By analyzing its curing mechanism,it could be found that the materials of gelling system react with each other,and the materials stimulated the hydration reaction of phosphogypsum to produce hydration products including ettringite and calcium silicate hydrate gel.The hydration products gradually filled the gaps between particles,and the bonding between particles became closer,making the strength of phosphogypsum based aggregate sustainable.The water resistance was improved by direct mixing,pretreatment of phosphogypsum and immersion coating.It was found that the water-repellent agent OS could improve the interface hydrophilicity of the aggregate in different treatment methods,and the contact angle reached 122.7°after coating treatment,the aggregate surface became hydrophobic.Coating treatment had little influence on the strength of aggregate,and could effectively improve the water resistance of aggregate.

关 键 词：磷石膏 正交设计 人造骨料 压制制备 耐水性能 

分 类 号：TQ177.3[化学工程—硅酸盐工业] X705[环境科学与工程—环境工程]