Acceleration of acid mine drainage generation with ozone and hydrogen peroxide: Kinetic leach column test and oxidant propagation modeling

Gomes, Thauan; Angioletto, Elídio; Quadri, Marintho Bastos; Cargnin, Maykon; Souza, Hilária Mendes de

doi:10.1016/j.mineng.2021.107282

Cited by 5 publications

(3 citation statements)

References 62 publications

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“…These are great examples that there is no 'one-size-fits-all' solution and each case needs to be diagnosed in detail before proposing solutions A new approach that has been studied by the ANM and CPRM, as an alternative to the initial Terms of Reference, is the removal of pyrite from coal tailings before their discharged. Several studies have demonstrated the feasibility of treating coal tailings, either to accelerate the oxidation kinetics of pyrite with ozone and hydrogen peroxide, aiming to decontaminate the tailings (Gomes et al 2022), or for separation by density using bromoform, with subsequent leaching with water and acetone (Oliveira 2016) or lithium heteropolytungstate (Ghedin et al 2022).…”

Section: Main Challenges To Be Overcome For Future Rehabilitation And...mentioning

confidence: 99%

Legacy coal mines in Southern Brazil: Actions from National Mining Agency to promote fair mine closure and their transitions to another land-use

Perlatti,

Kutchenski,

Abel Pasti

et al. 2023

Proceedings of the International Conference on Mine Closure

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Issues related to legacy mines and their environmental and social impacts that occur in the coal basin in southern Brazil, in the state of Santa Catarina, Brazil, are described in this paper, as well as actions promoted by the Brazilian government to identify and measure the extent and severity of the impacts. In this region the extraction and processing of coal began in the early 20 th century, when the legislation for the activity were not well-established, leading to the abandonment of dozens of mines, exceeding thousands of hectares. These legacy coal mines, with high levels of sulphur and heavy metals, have been causing several environmental impacts over time due to exposure and abandonment of waste rock and tailings from open pits and underground mines. Problems such as generation of acidic drainage as well as water and soil contamination jeopardize the adjacent ecosystems and the public health of local communities. The Brazilian Federal Government, represented by the National Mining Agency (ANM), which is responsible for issuing mine permits, was forced to find solutions for these legacy sites, as well as some companies that still operate. For more than ten years, works have been carried out, with the aim of reclaiming these areas using techniques to minimize the geochemical impacts of coal tailings, as well as to recover affected ecosystems. In this paper, the main technical and regulatory challenges in the Brazilian legacy coal mining industry are presented, as well as the search for solutions to overcome these obstacles. Some examples of reclaimed areas including monitoring data from three river basins are presented, which show the success and failure cases of the techniques used. We address also the main challenges that still need to be overcome so that these areas, public and private, can be returned to the environment and society in a way that provide quality ecosystem services, as well as sustainable future uses, providing a fair transition for stakeholders.

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Section: Main Challenges To Be Overcome For Future Rehabilitation And...mentioning

confidence: 99%

Legacy coal mines in Southern Brazil: Actions from National Mining Agency to promote fair mine closure and their transitions to another land-use

Perlatti,

Kutchenski,

Abel Pasti

et al. 2023

Proceedings of the International Conference on Mine Closure

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“…According to the field measurement, the flow velocity of ARD at the discharge outlet of the 12 mining sites in the rainy season and the dry season was 2.16 L/s and 1.39 L/s, respectively. The dilution from rainwater can reduce their concentrations, but may lead to a more pronounced effect on the surrounding soil due to the rising water levels and flow velocities (Engel et al, 2021;Gomes et al, 2022). Usually, Fe and Mn have fewer side effects on human health than the aforementioned pollutants.…”

Section: Properties Of the Acid Rock Drainagementioning

confidence: 99%

“…Though the high contents of elements in the mining area result from the regional geological background, the high bulk PTEs in this study were mainly caused by ARD. In addition, some metals (e.g., Pb and Cd) in acidified soils migrate longer distances under rain-washed conditions (Engel et al, 2021;Gomes et al, 2022).…”

Section: Mechanisms Of Acid Rock Drainage Influencing Soil Qualitymentioning

confidence: 99%

Characterization and risk assessment of soil around waste rock heaps affected by acid rock drainage in an abandoned pyrite mining area

Tong

Peng²,

Chen³

et al. 2022

Front. Environ. Sci.

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Acid rock drainage (ARD) is one of the most serious and potentially lasting environmental issues for the mining industry. Many researchers investigated the impact of ARD on downstream farmland, but few focused on the soil properties change around waste rock heaps. In this study, a total of 119 soil samples were taken around the 35 waste rock heaps which are scattered in 12 mining sites in an abandoned pyrite mining area (Baihe County, Northwest China). Both rainy and dry seasons of ARD were collected from the discharge outlet of each mining site. The bulk levels of potentially toxic elements (PTEs), including As, Cd, Cu, Ni, Cr, Zn, Pb, Fe, Mn, and F, in waste rock, soil, and ARD samples were analyzed. Leaching concentration and chemical speciation of these PTEs in soils were further investigated. The results show that the ARD had very high pollution loads of PTEs both in the rainy season and dry season, continuously exporting pollutants to the surrounding soils. More than 70% of the soil samples were acidic (pH<5.5). The bulk of As in 17 soil surface samples exceeded the risk control limit specified in China (60 mg/kg), while the leaching concentrations of As and other PTEs in soil were far below the regulated limits. According to the sequential extraction results, the residual fraction of As, Cr, Cu, Zn, and Ni in the soil accounted for over 90%, indicating these metals were possibly retained by the silicate matrix. Considering the relatively low bioavailability of PTEs and limited exposure routes, the human health risk of the soil surrounding the waste heap is generally acceptable. This research work provides a more comprehensive understanding of the properties and effects of ARD in the pyrite mining area which is conducive to the development of a sustainable control strategy of environmental pollution in typical mining regions.

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Leaching characteristics and pollution risk assessment of potentially harmful elements from coal gangue exposed to weathering for different periods of time

Shi

Peng

et al. 2023

Environ Sci Pollut Res

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Acceleration of acid mine drainage generation with ozone and hydrogen peroxide: Kinetic leach column test and oxidant propagation modeling

Cited by 5 publications

References 62 publications

Legacy coal mines in Southern Brazil: Actions from National Mining Agency to promote fair mine closure and their transitions to another land-use

Legacy coal mines in Southern Brazil: Actions from National Mining Agency to promote fair mine closure and their transitions to another land-use

Characterization and risk assessment of soil around waste rock heaps affected by acid rock drainage in an abandoned pyrite mining area

Leaching characteristics and pollution risk assessment of potentially harmful elements from coal gangue exposed to weathering for different periods of time

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