阳离子交换对高庙子钠基膨润土膨胀性能的影响

发布时间：2019-03-15 14:45

【摘要】：为了研究高放废物处置库中入渗地下水中阳离子与膨润土发生离子交换反应进而对膨润土的膨胀性能产生不利影响的科学问题,将高庙子钠基(GMZ01)膨润土分别与氯化钠、氯化钙和氯化镁溶液相混合,通过对溶液混合后试样进行矿物含量和交换性阳离子含量测试,结合溶液混合试样在蒸馏水中的膨胀变形试验,研究GMZ01膨润土阳离子交换反应后膨胀性能的变化情况.结果表明,GMZ01膨润土与NaCl混合后交换性Na+量略有增加,用浓度为1mol/L NaCl与2mol/L NaCl溶液混合试样在蒸馏水中的膨胀性差距较小;与1mol/L CaCl2和1mol/L MgCl2溶液混合后,Ca~(2+)和Mg~(2+)置换了Na+,导致这2种溶液混合试样的膨胀性能均小于2mol/L NaCl溶液混合试样,表明Ca~(2+)和Mg~(2+)等二价阳离子对钠基膨润土的膨胀性有较强的抑制作用.
[Abstract]:In order to study the scientific problem of ion exchange reaction between cation and bentonite in the infiltration groundwater of high level radioactive waste disposal bank and its adverse effect on the swelling performance of bentonite, GMZ01 bentonite and sodium chloride were used respectively. Calcium chloride and magnesium chloride are mixed together, and the mineral content and exchangeable cation content of the mixed sample are measured, combined with the expansion deformation test of the mixed sample in distilled water. The change of expansion property of GMZ01 bentonite after cation exchange reaction was studied. The results showed that the amount of exchangeable Na of GMZ01 bentonite mixed with NaCl increased slightly, and the difference of expansibility of mixed samples in distilled water with 1mol/L NaCl and 2mol/L NaCl solution was small. After mixing with 1mol/L CaCl2 and 1mol/L MgCl2 solutions, Ca~ (2) and Mg~ (2) replaced Na, resulting in the swelling properties of these two solutions mixed samples are lower than that of 2mol/L NaCl solution mixed samples. The results show that divalent cations such as Ca~ (2) and Mg~ (2) have a strong inhibitory effect on the swelling of sodium bentonite.
【作者单位】：安徽工业大学建筑工程学院;上海交通大学船舶海洋与建筑工程学院;
【基金】：国家自然科学基金资助项目(41272318,41472251,41630633) 安徽省自然科学基金资助项目(1708085QE99)
【分类号】：TU443

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