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Minerals 2017, 7(4), 54; doi:10.3390/min7040054

Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches

1
School of Resources and Safety Engineering, Central South University, Changsha 410083, China
2
School of Civil, Environmental and Mining Engineering, The University of Western Australia, Crawley 36009, Australia
*
Authors to whom correspondence should be addressed.
Academic Editor: Glen Corder
Received: 3 March 2017 / Revised: 24 March 2017 / Accepted: 2 April 2017 / Published: 5 April 2017
(This article belongs to the Special Issue Minerals in Mine Wastes: Contributions to the Circular Economy)
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Abstract

Large amounts of leaching residue are released into tailings dams from mines, and their acid content can cause environmental pollution. The aim of this study was to research the feasibility and value of a leaching residue backfill recycling method. The combination of property detection, laboratory tests (the neutralization method, strength test and diffusivity test) and numerical simulation methods (3D computational fluid dynamics (CFD) simulations of pipeline transportation properties) were used to assess the performance of the leaching residue backfill. The results show that backfill body with the cement:sand mass ratio of 1:3, the leaching residue:classified tailings ratio of 1:6, and slurry mass concentration of 71 wt % can meet the strength and pipeline self-flowing transportation requirements of mine backfill. The leaching residue is a good backfill aggregate, and its recovery ratio can reach 19.5 wt %. In addition, the recycling of leaching residue effectively alleviates the problem of mine waste emissions and protects the ecological environment surrounding the mining area. This study serves as a guide for the recycling of fine tailings and the environmental governance of the mining area. View Full-Text
Keywords: recycling; ultrafine leaching residue; waste; backfill; environment recycling; ultrafine leaching residue; waste; backfill; environment
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Chen, X.; Shi, X.; Zhou, J.; Chen, Q.; Yang, C. Feasibility of Recycling Ultrafine Leaching Residue by Backfill: Experimental and CFD Approaches. Minerals 2017, 7, 54.

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