Abstract
Mine tailing storage represents an important environmental issue. The generation and dispersal of dust from mine tailings can contaminate air and surrounding soils. In addition, metals and soluble salts present in these wastes could pollute groundwater and surface water. The recovery of metals from mine tailings can contribute to minimize the environmental risk and to achieve a circular economy model. The main objective of the present work is to study the use of two carbon-based materials, a commercial activated carbon (AC) and a commercial charcoal (VC) in the leaching of zinc and copper from low-grade tailing waste. Experimental results obtained show that it is possible to achieve the recovery of more than 87 wt% of Zn after 6 h of leaching with different sulfuric acid solutions. The addition of carbon-based materials increases the extraction of Zn at high sulfuric acid concentrations (1 M) from 89% to 99%. The addition of VC significantly increases the extraction of Cu in leaching solution with high sulfuric acid concentration (1 M), from 41 to 61%. Future research will be necessary to optimize the properties of carbon-based materials and their recovery after leaching experiments in order to assess their potential for industrial application.
Highlights
Some mine tailings include sulfide minerals that can induce the formation of acid mine drainage (AMD) and acid rock drainage (ARD) [2]
The selected sample was collected from abandoned mine tailings located in Rambla del Beal (RD), Murcia, Spain
The main conclusions obtained in the present works are the following: It is possible to recover more than 95 wt% of Zn from the selected mine tailings after
Summary
Mine tailings are the slurries that remain after the treatment of minerals by separation processes (crushing, grinding, or flotation) and other physicochemical techniques in order to extract the valuable minerals from the less valuable rocks. Mine tailings are produced at a rate of anywhere from five to fourteen billion tons per year [1]. Their storage in tailing dam basins represents an important environmental issue [1]. Some mine tailings include sulfide minerals that can induce the formation of acid mine drainage (AMD) and acid rock drainage (ARD) [2]. Mine Waste Levels Cr Co Ni Se Cd Sb Hg
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