Improvement of heap leaching pile bottom impermeability

The article addresses the problem connected with the environmental safety of heap leaching of noble and rare earth metals through improvement of impermeability of pile bottom. Heap leaching assumes selective dissolution of valuable components in toxic solutions and subsequent separation of the valuable components from pregnant solutions. Thus, it is critical to control compliance with the ecological safety standards. This study proposes an integrated multi-layered structure of the heap leaching pile bottom as drainage-and-shielding layers composed of fibrous polymers and water-proof polymeric film layers. The theoretical investigation and trials of fibrous polymer–rock macro contacts determined the optimal heights of the upper and lower shielding layers of fibrous polymers. The multi-layer pile bottom composed of two protective polymeric layers, polymeric film and hydro-active sealing component improves impermeability of pile bottom in heap leaching of ores, tailings and concentrates. Such pile bottom structure reduces probability of ecological risks in heap leaching.

Keywords: heap leaching, pile bottom, multi-layered structure, drainage-and-shielding materials, water-proof film, percolation, gold ore, anti-seepage bottom structure.
For citation:

Gerasimov V. M., Nizhegorodcev E. I. Improvement of heap leaching pile bottom impermeability. MIAB. Mining Inf. Anal. Bull. 2021;(2):120-126. [In Russ]. DOI: 10.25018/02361493-2021-2-0-120-126.

Acknowledgements:
Issue number: 2
Year: 2021
Page number: 120-126
ISBN: 0236-1493
UDK: 622.271.62
DOI: 10.25018/0236-1493-2021-2-0-120-126
Article receipt date: 17.05.2020
Date of review receipt: 17.09.2020
Date of the editorial board′s decision on the article′s publishing: 10.01.2021
About authors:

V.M. Gerasimov1, Dr. Sci. (Eng.), Professor, Head of Chair,
E.I. Nizhegorodcev1, Cand. Sci. (Eng.),
1 Transbaikal State University, 672039, Chita, Russia.

For contacts:

E.I. Nizhegorodcev, e-mail: dj_world@mail.ru.

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