聚合物改性钙基膨润土制备工艺对水力性能的影响  

Impact of manufacture method on the hydraulic performance of polymer-enhanced calcium bentonites

作　　者：刘骏逸 仝杉 李育超[1] 李静静 董浩然 LIU Jun-yi;TONG Shan;LI Yu-chao;LI Jing-jing;DONG Hao-ran(Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education,Zhejiang University,Hangzhou 310058,China;Zhejiang Fenghong New Materials Limited Company,Huzhou 313300,China;Jingtai New Energy(Shanghai)Limited Company,Shanghai 200050,China)

机构地区：[1]浙江大学,软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江丰虹新材料股份有限公司,浙江湖州313300 [3]景泰新能源(上海)有限公司,上海200050

出　　处：《中国环境科学》2024年第10期5696-5704,共9页China Environmental Science

基　　金：国家自然科学基金资助项目(42077241);国家重点研发计划项目(2019YFC1806000);国家自然科学基金资助项目(2308382)。

摘　　要：以钙基膨润土为原土,聚丙烯酸钠为聚合物添加剂,采用干混、湿混、物理捏合和原位聚合法制备改性膨润土.通过自由膨胀和改进滤失试验,评估了酸性矿山废水作用下制备工艺对改性膨润土水力性能的影响.结果表明,在酸性矿山废水作用下,干混、湿混和物理捏合法制备的改性膨润土膨胀指数较原土增大1.1~4倍,滤失量、渗透系数增大2.7~5.3倍和1.4~2.4倍,原位聚合法制备的改性膨润土膨胀指数较原土增大4倍,滤失量、渗透系数下降30%和97%.改性膨润土在酸性矿山废水中的水力性能如下:原位聚合>物理捏合>湿混>干混.场地污染较轻、材料应用成本有限时,可采用干混制备工艺;场地污染严重、污染物管控严格时,可采用原位聚合制备工艺.Sodium polyacrylate amended Ca-bentonites(PAAS-CaBs)were prepared by dry mixing,wet mixing,wet kneading and in-situ polymerization.The hydraulic properties of polymer enhanced bentonites under acidic mine drainage solution(AMD)were investigated by swell index and modified fluid loss tests.When tested with AMD,values of swell index,fluid loss and hydraulic conductivity of PAAS-CaBs prepared by dry-mixing,wet-mixing and wet-kneading increased by factors of 1.1~4,2.7~5.3,and 1.4~2.4,respectively,whereas that of PAAS-CaBs prepared by in-situ polymerization increased by a factor of 4 and decreased by 30%and 97%,comparing to the unamended CaBs.In general,the hydraulic properties of polymer enhanced bentonites under AMD solution deteriorate in the following order:in-situ polymerization>wet-kneading>wet-mixing>dry-mixing.The dry-mixing method is recommended for scenarios with mild contamination and limited budget,whereas the in-situ polymerization method is recommended for scenarios with severe contamination and high-level criteria of pollution control.

关 键 词：聚合物改性膨润土 制备工艺 土工合成黏土衬垫 酸性矿山废水 水力性能 

分 类 号：X705[环境科学与工程—环境工程]