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赤泥渗滤液对钠基膨润土黏土衬垫的渗透机理分析

李芹,  廖才能,  廖明旭,  彭道平,  黄涛

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文章导航 > 环境工程  > 2021 >  39(1): 148-153
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引用本文: 李芹, 廖才能, 廖明旭, 彭道平, 黄涛. 赤泥渗滤液对钠基膨润土黏土衬垫的渗透机理分析[J]. 环境工程, 2021, 39(1): 148-153. doi: 10.13205/j.hjgc.202101023
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LI Qin, LIAO Cai-neng, LIAO Ming-xu, PENG Dao-ping, HUANG Tao. MECHANISMS CONTROLLING HYDRAULIC CONDUCTIVITY OF BENTONITE CLAY LINERS WITH BAUXITE LIQUOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(1): 148-153. doi: 10.13205/j.hjgc.202101023
Citation: LI Qin, LIAO Cai-neng, LIAO Ming-xu, PENG Dao-ping, HUANG Tao. MECHANISMS CONTROLLING HYDRAULIC CONDUCTIVITY OF BENTONITE CLAY LINERS WITH BAUXITE LIQUOR[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(1): 148-153. doi: 10.13205/j.hjgc.202101023
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赤泥渗滤液对钠基膨润土黏土衬垫的渗透机理分析

doi: 10.13205/j.hjgc.202101023

  • 西南交通大学 地球科学与环境工程学院, 成都 611756

基金项目: 

四川省科技计划项目（2019YJ0244）；软弱土与环境土工教育部重点实验室（浙江大学）开放基金（2019P04）。

详细信息
    作者简介:

    李芹(1985-),女,博士,主要研究方向为固体废弃物处理处置、工业固体废物的岩土力学特性及化学分析。liqin2017@my.swjtu.edu.cn

    通讯作者:

    彭道平(1985-),男,博士,副教授,主要研究方向为工程水环境效应及其控制、工业固体废物的岩土力学特性及化学分析。pdp0330@swjtu.cn

MECHANISMS CONTROLLING HYDRAULIC CONDUCTIVITY OF BENTONITE CLAY LINERS WITH BAUXITE LIQUOR

  • Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China

摘要

    摘要
  • 摘要: 赤泥渗滤液的高离子强度可以抑制蒙脱石的膨胀，从而导致钠基膨润土黏土衬垫（GCL）的渗透性过强，并无法用作赤泥处理设施中的防渗衬层。通过2种钠基膨润土黏土衬垫与2种赤泥渗滤液的渗透过程，研究强碱性赤泥渗滤液与钠基膨润土黏土衬垫的渗透机理。结果表明：天然钠基膨润土（Na-GCL）和人工钠化钠基膨润土（Ar-GCL）的渗透系数与赤泥渗滤液的离子强度密切相关，随着离子强度的增加，渗透系数呈递进式系统性增大，对高离子强度的山东赤泥渗滤液的渗透系数最大，分别为7.8×10-7，3.2×10-7 m/s。且两者的渗透系数与膨胀指数呈正相关，SEM扫描的微观结构分析发现，膨润土的膨胀机理控制着其渗透作用。高离子强度会使膨润土中的蒙脱石矿物层间发生渗透性膨胀，并吸收大量的水分，减小孔隙度的同时改变流体的流动路径，从而导致渗透系数提高。该结果可为赤泥堆场底部防渗设计提供更为可靠的理论参考，有效降低我国赤泥堆场渗滤液污染风险。
    Abstract: The high ionic strength of bauxite liquor could suppress swelling of montmorillonite, which results in sodium bentonite clay liner (GCL) that was too permeable to be used as an impermeable liner in red mud treatment facilities. The mechanism controlling of strongly alkaline bauxite liquor and sodium bentonite clay liner was investigated through the infiltration process of sodium bentonite clay liner and two types of bauxite liquor. The results showed that hydraulic conductivity of natural sodium bentonite (Na-GCL) and artificial sodium bentonite (Ar-GCL) was closely related to ionic strength of bauxite liquor. As ionic strength increased, hydraulic conductivity systematically increased. Hydraulic conductivity of Shandong bauxite liquor with high ionic strength was the largest, 7.8×10-7 and 3.2×10-7 m/s, respectively. Hydraulic conductivity was positively related to swelling index. Through the analysis of the microstructure diagram of SEM scanning, swelling mechanism of bentonite controlled its hydraulic conductivity. High ionic strength caused permeable expansion of bentonite mineral layer, and absorbed a large amount of water, which reduced the porosity and changed the flow path of the fluid, resulting in an increase of hydraulic conductivity.
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  • 收稿日期:  2019-12-12
  • 网络出版日期:  2021-04-23

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