Electroosmosis of gold tailings under multiple electrokinetic geosynthetics electrodes

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-03-12 DOI:10.1016/j.geotexmem.2024.03.002
Changbo Du , Ben Niu , Fu Yi , Meng Wang , Xinqi Jiang
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Abstract

In dry-stack tailing ponds with high fine-grained content, a high long-term saturation line can lead to dam failure. Electroosmotic consolidation is an effective method for reducing dam saturation lines. However, traditional electrodes have low corrosion resistance and poor contact, which limits the development of electroosmotic drainage technology for tailings. In this study, an electroosmotic drainage device, an electrokinetic geosynthetic (EKG) electrode, was designed. The influence law of the electrode material, potential gradient, and number of electrodes on the water drainage, current, and resistance was analyzed. The results show that the EKG electrode has excellent corrosion resistance, with its weight loss after electroosmosis, water drainage, and equivalent allowable current being 1.67%, 122%, and ∼2.3 times that of a copper electrode, respectively. Furthermore, it was found that the optimal potential gradient was 1.2 V/cm, and the water drainage cannot be improved by an exceedingly high potential gradient. The current pathway in the test box was in parallel, and the water drainage increased to 410% and the contact resistance decreased by 83% when the number of electrodes was four. These results and novel methodology provide new ideas for EKG electrode design and represent an effective method for saturation line control in gold tailing ponds.

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金尾矿在多电动力土工合成材料电极下的电渗作用
在细粒含量较高的干堆尾矿库中,长期高饱和线会导致溃坝。电渗固结是减少坝体饱和线的有效方法。然而,传统电极耐腐蚀性低、接触不良,限制了尾矿电渗排水技术的发展。本研究设计了一种电渗排水装置--电动力土工合成材料(EKG)电极。分析了电极材料、电位梯度和电极数量对排水、电流和电阻的影响规律。结果表明,EKG 电极具有优异的耐腐蚀性,其电渗、排水和等效容许电流后的失重分别是铜电极的 1.67%、122% 和 2.3 倍。此外,还发现最佳电位梯度为 1.2 V/cm,过高的电位梯度无法改善排水效果。试验箱中的电流通路是并联的,当电极数量为四个时,排水量增加了 410%,接触电阻降低了 83%。这些结果和新方法为 EKG 电极设计提供了新思路,是金尾矿库饱和线控制的有效方法。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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