预水化膨润土防水毯的制备及防渗机理研究

金属矿山 ›› 2022, Vol. 51 ›› Issue (07): 219-224.

预水化膨润土防水毯的制备及防渗机理研究

廖敏¹管俊芳¹郑长文²李银¹杨成亮¹丁定¹

1.武汉理工大学资源与环境工程学院，湖北武汉 430070；2.咸阳非金属矿研究设计院有限公司，陕西咸阳 712000

出版日期:2022-07-15 发布日期:2022-07-31
基金资助:
“十三五”国家重点研发计划项目（编号：2017YFB0310902）。

Study on Preparation and Preventing Leakage Mechanism of Dense Pre-hydrated Geosynthetic Clay Liner

LIAO Min¹GUAN Junfan¹ZHENG Changwen²LI Yin¹YANG Chengliang¹DING Ding¹

1.School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China; 2.Xianyang Non-metallic Ore Research and Design Institute Co.,Ltd.,Xianyang 712000,China

Online:2022-07-15 Published:2022-07-31

摘要/Abstract

摘要： 为探究改性和混炼工艺对预水化膨润土防水毯（DPH-GCL）防渗效果的影响，以新疆夏子街膨润土为原料，天然雨水为渗漏的水介质，进行了不同制备工艺条件下DPHGCL的渗滤试验，确定了适宜的制备工艺，并通过显微镜、FTIR及XRD分析防渗机理。结果表明：① 改性混炼复合工艺的C型毯防渗效果最好，改性剂用量方案为：2 g酰胺类聚合物单体Ⅰ、0.15 g引发剂Ⅱ和0.07 g引发剂Ⅲ，仅改性处理的B型毯防渗效果稍次，未经改性混炼处理的A型毯防渗效果最差。② 3种DPH-GCL适宜的覆膜时间和压力分别为：A型毯5 min、5 MPa，B型毯5 min、1 MPa，C型毯1 min、1 MPa。③改性和混炼工艺均会影响膨润土的连接状态，改性后膨润土颗粒表面疏水，混炼增强膨润土水化能力，膨润土能更多地吸附溶液中水分子及其他离子，并且颗粒之间更密实，结构更稳定。

关键词: 预水化膨润土防水毯, 预水化, 制备工艺, 表征分析

Abstract: In order to explore the effects of modification and mixing process on preventing leakage effect of dense pre-hydrated geosynthetic clay liner (DPH-GCL),infiltration test of the DPH-GCL in different preparation conditions were conducted with bentonite in Xiazijie street in Xinjiang as raw material,natural rain as the leakage of water medium.The appropriate preparation technology were determined,and preventing leakage mechanism were analyzed through the microscope,FTIR and XRD.The results showed that: ① The preventing leakage effect of C-type blanket,which was treated with modified and mixing combinated process,is the best.And the dosage scheme of modified reagent is 2 g amide polymer monomer Ⅰ,0.15 g initiator Ⅱ and 0.07 g initiator Ⅲ.The preventing leakage effect of B-type blanket treated only by modification is slightly worse,and the preventing leakage effect of A-type blanket without modification or mixing is the worst.② The suitable laminating time and pressure of three kinds of DPH-GCl are as follows: A-type blanket 5 min,5 MPa,B-type blanket 5 min,1 MPa,C-type blanket 1 min,1 MPa.③ Modification and mixing process can affect the bonding state of bentonite.After modification,the surface of bentonite particles is hydrophobic,and mixing enhances the hydration ability of bentonite.Bentonite can adsorb more water molecules and other ions in the solution,and the structure is more compact between the particles,and more stable.

Key words: dense pre-hydrated geosynthetic clay liner,pre-hydrated,preparation process,characterization analysis

廖敏, 管俊芳, 郑长文, 李银, 杨成亮, 丁定. 预水化膨润土防水毯的制备及防渗机理研究[J]. 金属矿山, 2022, 51(07): 219-224.

LIAO Min, GUAN Junfan, ZHENG Changwen, LI Yin, YANG Chengliang, DING Ding. Study on Preparation and Preventing Leakage Mechanism of Dense Pre-hydrated Geosynthetic Clay Liner[J]. Metal Mine, 2022, 51(07): 219-224.

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