Electrokinetic control of the growth of gypsum aggregates in compacted montmorillonite

Electrokinetic control of the growth of gypsum aggregates in compacted montmorillonite
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压实蒙脱土中石膏骨料生长的动电控制

DOI:
10.1016/j.clay.2019.105206
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发表时间:
2019
影响因子:
5.6
通讯作者:
Tanaka Shingo
Tanaka Shingo
中科院分区:
地球科学2区
文献类型:
--
作者:
Isokawa Yuya;Nakauchi Daisuke;Okada Go;Kawaguchi Noriaki;Yanagida Takayuki;Masaaki Suzuki;Tanaka Shingo

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矿物沉淀及其对粘土材料屏障功能的影响在放射性废物地质处置中引起了人们的关注。在本研究中,使用电动方法研究了压实蒙脱土中石膏骨料的生长。结果表明,通过调节Na/Ca混合蒙脱石中Ca的初始浓度可以部分控制聚集体的形态。特别是,长时间维持较低的初始 Ca 浓度会导致石膏生长为一层高达 700μm 的大聚集体。石膏骨料层的制作时间很短(1天),层周围没有多余的盐。与反扩散法相比,电动法在粘土材料中形成人工沉淀物的持续时间短且不存在过量盐是其主要优点。增强和控制聚集体的技术可用于制备蚀变膨润土,可用于评估沉淀物及其形态对压实膨润土扩散性和渗透性的影响。
Mineral precipitation and its impact on the barrier functions of clayey materials have attracted attention in the geological disposal of radioactive wastes. In this study, the growth of gypsum aggregates in compacted montmorillonite was investigated using the electrokinetic method. The results demonstrated that the morphology of aggregates can be partially controlled by adjusting the initial concentration of Ca in Na/Ca mixed montmorillonite. In particular, a lower initial Ca concentration maintained for long periods of time engendered the growth of gypsum as a layer of large aggregates up to 700 μm. The layer of gypsum aggregates was made for a short duration (1 day) without excess salt remaining around the layer. The short duration and the absence of excess salt represent the main advantage of the electrokinetic method compared to a counter diffusion method to form artificial precipitates in clayey materials. Techniques to enhance and control aggregates are useful to prepare altered bentonite, which can be used to evaluate the impact of precipitates and their morphologies on the diffusivity and permeability of compacted bentonite.
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DOI: 10.1016/j.egypro.2017.09.450
发表时间: 2017
期刊: Energy Procedia
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作者:
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发表时间: 2017-06-01
影响因子: 3.7
作者:
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DOI: 10.1038/s41598-017-14142-0
发表时间: 2017-10-23
期刊: Scientific reports
影响因子: 4.6
作者:
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