Electrodialytic treatment of secondary mining resources for raw materials extraction: Reactor design assessment

Almeida, Joana; Magro, Cátia; Rosário, Ana Rita Adrião; Mateus, Eduardo P.; Ribeiro, Alexandra B.

doi:10.1016/j.scitotenv.2020.141822

Cited by 6 publications

(5 citation statements)

References 38 publications

(42 reference statements)

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“…Table 5 presents an energy assessment for the three bench scale ED treatment scenarios. These tests were performed to treat 39 [18] and 22 g [16,20] of fine tailings in a two-and/or three-compartment ED reactor, respectively. The energy was determined according to Equation (1).…”

Section: Ed Treatment With H 2 Recoverymentioning

confidence: 99%

“…Regarding the water needs for sample suspensions and electrolyte preparation with sodium nitrate (NaNO 3 ), ED configurations that have three compartments require 700 mL (32 times the sample weight) and the two-compartment systems require 600 mL (15 times the sample weight). However, the reuse of secondary water resources during the ED treatment (e.g., secondary effluent) have shown promising results [16] that may contribute to alleviate tap water needs.…”

Section: Ed Treatment With H 2 Recoverymentioning

confidence: 99%

“…One feasible method to alleviate the impacts of rejected fractions from mining activities is the electrodialytic (ED) process, which consists of the application of a direct low-level current density (mA/cm 2 ) between pairs of electrodes, to remove substances from different environmental substrates. In the ED treatment of mine tailings, anion (AEM) and cation exchange membranes (CEMs) were used to separate the matrix from the electrodes' compartments [16]. This aimed at controlling the pH conditions of the electrolyte and the matrix, improving the selectivity of the removal of contaminants [17].…”

Section: Introductionmentioning

confidence: 99%

“…Research has been performed to assess the feasibility of applying the ED treatment to W mine tailings to (1) recover W contents and other elements of interest [16], (2) remove harmful compounds [18], (3) to recover H 2 that is inherently produced during the treatment [19,20], and (4) to provide a suitable matrix for further reuse in the construction sector as a supplementary cementitious material [21]. Furthermore, the ED process has demonstrated potential to extract W present in fine tailings (approximately 22%) in the presence of biodegradable acid adjuvants-natural deep eutectic solvents (DES) [18].…”

Section: Introductionmentioning

confidence: 99%

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Life Cycle Assessment of Electrodialytic Technologies to Recover Raw Materials from Mine Tailings

et al. 2021

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Currently, the development of new sustainable technologies to recover raw materials from secondary resources has shown a lack of available data on the processes and supplies involved, as well as their environmental impacts. The present research has conducted a life cycle assessment of electrodialytic (ED) technologies to improve critical raw materials recovery in the Portuguese mining industry. To critically appraise the activities from the mining sector and gather data on technical and environmental issues, three waste management scenarios were considered: (1) ED treatment with a deep eutectic solvent as an adjuvant; (2) ED treatment with simultaneous H2 recovery; and (3) ED treatment with sodium chloride as an enhancement. The data presented were based on global databases, technical reports from official sources, and peer-reviewed published experimental outcomes. The estimated results indicated that one of the constraints in applying ED technologies is energy consumption and thus the impacts are highly dependent on energy source choices. On the other hand, as a consequence of the H2 inherently produced by ED technologies, there is a direct potential for energy recovery. Therefore, considering an upscale approach of the ED reactor based on bench scale experimental results, the H2 could be reused in the ED facility or stored. Additionally, according to experimental data, 22% of the tungsten from the fine mine tailings could be recovered. Finally, the possibility to remove 63% of arsenic from mine tailings could decrease contamination risks while creating additional marketable co-products.

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Section: Ed Treatment With H 2 Recoverymentioning

confidence: 99%

Section: Ed Treatment With H 2 Recoverymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Life Cycle Assessment of Electrodialytic Technologies to Recover Raw Materials from Mine Tailings

et al. 2021

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“…In this sense, the pursuit of potential sources of these strategic elements in Europe has become a relevant issue (Balaram 2019 ). Hence, waste recycling is presented as a viable alternative in terms of sustainability and circular economy, which has been poorly implemented (Almeida et al 2021 ; Dang and Li 2022 ); in fact, currently, barely 2.8% of the total REEs waste discarded is recycled (Lima and Ottosen 2021 ). Consequently, mining wastes from metallic ores could be a valuable source for the recovery of REEs and a suitable initiative for treating this type of stockpiled and abandoned wastes at mining sites (Goodenough et al 2016 ; Van der Ent et al 2021 ; Hernández et al 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Can rare earth elements be recovered from abandoned mine tailings by means of electrokinetic-assisted phytoextraction?

Medina-Díaz,

López-Bellido,

Alonso-Azcárate

et al. 2024

Environ Sci Pollut Res

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Given the high impact of traditional mining, the recovery of rare earth elements (REEs) from hazardous waste materials could become an option for the future in accordance with the principles of the circular economy. In this work, the technical feasibility of REEs recovery from metal mine tailings has been explored using electrokinetic-assisted phytoremediation with ryegrass (Lolium perenne L.). Phytoextraction combined with both AC current and DC current with reversal polarity was applied (1 V cm−1, 8 h day−1) to real mine tailings containing a total concentration of REEs (Sc, Y, La, Ce, Pr, and Nd) of around 146 mg kg−1. Changes in REEs geochemical fractionation and their concentrations in the soil pore water showed the mobilization of REEs caused by plants and electric current; REE availability was increased to a higher extent for combined electrokinetic-assisted phytoextraction treatments showing the relevant role of plants in the process. Our results demonstrated the initial hypothesis that it is feasible to recover REEs from real metal mining waste by phytoextraction and that the performance of this technology can be significantly improved by applying electric current, especially of the AC type, which increased REE accumulation in ryegrass in the range 57–68% as compared to that of the treatment without electric field application.

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Electrochemical membrane technology for environmental remediation

Kong

Liu

Zhang

et al. 2022

Electrochemical Membrane Technology for Water and Wastewater Treatment

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Electrodialytic treatment of secondary mining resources for raw materials extraction: Reactor design assessment

Cited by 6 publications

References 38 publications

Life Cycle Assessment of Electrodialytic Technologies to Recover Raw Materials from Mine Tailings

Life Cycle Assessment of Electrodialytic Technologies to Recover Raw Materials from Mine Tailings

Can rare earth elements be recovered from abandoned mine tailings by means of electrokinetic-assisted phytoextraction?

Electrochemical membrane technology for environmental remediation

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