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Zn(NO3)2作用下改良膨润土渗透特性研究
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Abstract:
膨润土的化学相容性是影响竖向阻隔墙防渗性能的关键因素。本研究采用不同掺量的羧甲基纤维素钠(CMC)与钠化膨润土(B)直接拌合，制备一种聚合物改良膨润土(CB)，通过在自来水、Zn(NO3)2溶液中进行自由膨胀试验、滤失试验，探究改良膨润土的化学相容性。结果表明，经CMC改良后的膨润土在重金属溶液作用下膨胀性能较未改良膨润土好，渗透系数下降1~2个数量级，CMC的最佳掺量为2%。
The chemical compatibility of bentonite is the key factor affecting the anti-seepage performance of vertical barrier walls. A polymer modified bentonite (CB) was prepared by directly mixing sodium carboxymethylcellulose (CMC) with sodium bentonite (B) with different dosages. A series of tests were carried out in tap water and Zn(NO3)2 solution, such as free expansion index, filtration loss and permeability, to explore the chemical compatibility of the modified bentonite. The results show that the swelling property of bentonite modified by CMC under the action of heavy metal solution is better than that of unmodified bentonite, the permeability coefficient decreases by 1-2 orders of magnitude, and the optimum content of CMC is 2%.
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