Reuse of Dunite Mining Waste and Subproducts for the Stabilization of Metal(oid)s in Polluted Soils

Baragaño, Diego; Forján, Rubén; Menéndez-Aguado, Juan M.; Martino, Marcos Covián; García, Pamela Díaz; Rubio, J.M. Quiñonero; Rueda, Juan José Álvarez; Gallego, José Luis

doi:10.3390/min9080481

Cited by 9 publications

(2 citation statements)

References 40 publications

(41 reference statements)

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“…comms.). For extraction and saleable use, dunite fractions of >3 mm are typically desired, meaning fractions below 3 mm (including a finer fraction of <63 μm) are considered waste, stored in landfill or tailings dams (Baragaño et al, 2019). Approximately 80 kilotonnes (kt) of waste is produced each year (40 kt of size fraction 64 μm to 3 mm, 40 kt of sludge <64 μm).…”

Section: Silicate Mine and Quarry Wastesmentioning

confidence: 99%

Geochemical carbon dioxide removal potential of Spain

Tornos¹,

Bullock

Fernández-Turiel

et al. 2023

Preprint

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Many nations have pledged to reduce carbon dioxide (CO2) emissions over the remainder of the century to meet the Paris Agreement targets of limiting warming to no more than 1.5&#176;C, aiming for net zero by mid-century. This is the long-term commitment of the European Union (EU), which is targeting climate-neutrality by 2050, in line with the commitment to global climate action under the Paris Agreement and the European Green Deal. For many European nations, this means a critical examination of all potential pathways to net zero (or net negative), including assessing methodological options, material suitability and physical footprints. To achieve national and EU reduction targets, there is a further need for CO2 removal (CDR) approaches on a scale of millions of tonnes, necessitating a better understanding of feasible methods and materials for utilization. One approach that is gaining attention is geochemical CDR, encompassing (1) in-situ injection of CO2-rich gases into Ca and Mg-rich rocks for geological storage by mineral carbonation, (2) ex-situ approaches such as ocean alkalinity enhancement and ocean liming, enhanced weathering and carbonation of alkaline-rich materials, and (3) electrochemical separation processes. In this study, we examine the geochemical CDR potential of Spain. As an EU Member State, Spain is bound to adopt the national energy and climate plans to make considerable progress on its climate actions. Here, an assessment of the reactivity potential of materials and utilization sites in Spain has been made based on the suitability of hosted materials in terms of spatial and volumetric availability, chemistry, modal mineralogies and mineral kinetics. Spain hosts a potentially high geochemical CDR capacity thanks to its varied geological settings and its high tonnage production of industrial alkaline wastes, suitable due to their high Ca and Mg contents and varying occurrence of kinetically favourable minerals (e.g., serpentine, brucite, olivine). There are notional kilotonne to million tonne scale CDR options for Spain over the rest of the century, with attention paid to mafic, ultramafic and carbonate rocks, mine tailings, fly ashes, slag by-products, desalination brines and ceramic wastes, with industrial, agricultural and coastal areas providing opportunities to launch pilot schemes. Materials and land space are distributed across the Spanish mainland and islands, with particularly high potential for Galicia, Andaluc&#237;a, Murcia and the Canary Islands regions. The CDR potential of Spain warrants dedicated investigations to achieve the highest possible CDR to make valuable contributions to national reduction targets. Results can also be used to further define Spain&#8217;s overall climate targets and initiate future CDR plans and projects for academia, industry, government and other sectors of interest. This work forms part of the DETAILS project (Developing enhanced weathering methods in mine tailings for CO2 sequestration; Marie Sk&#322;odowska-Curie grant agreement ID: 101018312).

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Section: Silicate Mine and Quarry Wastesmentioning

confidence: 99%

Geochemical carbon dioxide removal potential of Spain

Tornos¹,

Bullock

Fernández-Turiel

et al. 2023

Preprint

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“…Mining and associated activities have negative environmental impacts during mining operations and for many years afterward. There is more concern regarding the environmental effects of mine tailing sites because the tailings produced during ore processing are characterized by elevated levels of potentially toxic metals that can be released into the environment by erosion and leaching processes [1][2][3]. In most cases, mining areas show high concentrations of hazardous elements in surface waters, groundwaters, and soils and these may represent important geochemical risks to human health and the environment [4,5].…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment of Contamination by Potentially Toxic Metals: A Case Study in the Vicinity of an Abandoned Pyrite Mine

Zhou

Xue

et al. 2019

Minerals

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Abandoned mining areas can display soil and water pollution and also a high incidence of endemic diseases. Here, based on preliminary results on mental retardation and high incidence rates of cancers, we investigate the contamination status and potential ecological risk at an abandoned pyrite mine located in Xianju village, Hubei province, central China. The study focused on the three potentially toxic metals As, Pb, and Zn and four other common elements, including Ca, Fe, S, and Se. Soil samples were collected from 12 sites and leachate seeping from five sites. Leachates were strongly acidic compared to the soil, with pH values <3.22. Soil As and Se concentrations exceeded the Chinese Grade II standards for soil environmental quality (GB 15618-2009) (30 and 3 mg·kg −1 , respectively), ranging from 33.6 ± 0.7 to 78.2 ± 1.0 mg As·kg −1 dry matter (DM) and 5.3 ± 0.8 to 17.1 ± 1.4 mg Se·kg −1 DM. Arsenic, Fe, Se, and S in leachates all exceeded the Chinese Grade III standard for surface water environmental quality (GB 3838-2002) (0.1, 0.3, 0.03, and 1.0 mg·L −1 ). The potential ecological risks from Pb and Zn in soils were low, but As in soils and leachates represented a moderate or strong risk to children according to the Nemerow index and hazard quotient. Soil replacement combined with further remediation measures is required to remediate the contaminated area.

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Soil Contamination, Risk Assessment, and Phytoremediation of Mine Land

2023

Eco‐Restoration of Mine Land

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Reuse of Dunite Mining Waste and Subproducts for the Stabilization of Metal(oid)s in Polluted Soils

Cited by 9 publications

References 40 publications

Geochemical carbon dioxide removal potential of Spain

Geochemical carbon dioxide removal potential of Spain

Risk Assessment of Contamination by Potentially Toxic Metals: A Case Study in the Vicinity of an Abandoned Pyrite Mine

Soil Contamination, Risk Assessment, and Phytoremediation of Mine Land

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