Application of dry covers for the closure of tailings facilities

Mylona, Evangelia; Xenidis, Anthimos; Csővári, Mihály; Németh, Gábor

doi:10.2462/09670513.849

Cited by 10 publications

(3 citation statements)

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“…Cover objectives are site specific but generally include dust and erosion control, control of oxygen ingress, control of contaminant release by infiltration reduction, minimization of radon emission from radioactive tailings, and providing a growth medium for vegetation [13]. As most of these objectives are related to the water balance at cover surface therefore, climate is a primary design variable in any soil cover system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Climate Change on a Monolithic Desulphurized Tailings Cover

Bashir

Ahmad

Beddoe

2020

Water

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A soil cover system can be viewed as a thin interface placed between the atmosphere and the underlying waste. Climate is a primary design variable in soil cover design; therefore, climate change poses a number of challenges to design, operation and long-term performance of covers. In this research climate change effects on the hydraulic behavior of soil covers at a Northern Ontario, Canada site were assessed. Covers were analyzed using historical and future climate datasets. Historical climate data were compiled from an Environment Canada weather station near the site. The future climate datasets were sourced for different Global Circulation Models (GCM) for various representative concentration pathways (RCP). The covers at the site were constructed with a single layer of desulphurized tailings. Soil covers were meant to limit oxygen ingress to the underlying reactive tailings by maintaining high water saturation in the covers. Oxygen flux through soil covers for current and future climates were predicted using variably saturated water flow and oxygen transport modeling using the finite element method. The results of this research indicate that the effect of climate change on soil cover depends on the hydraulic properties of the soil cover materials and that of the underlying tailings. The results of this study suggest that the effect of climate change on the coarse tailing covers could be marginal resulting in a maximum increase of 5% in oxygen flux at the cover surface for the future climates in comparison to the base climate. However, in the case of fine tailings covers, increases of up to 65% can be expected.

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Section: Introductionmentioning

confidence: 99%

Effect of Climate Change on a Monolithic Desulphurized Tailings Cover

Bashir

Ahmad

Beddoe

2020

Water

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“…Por outro lado, os riscos decorrentes do armazenamento de rejeitos de urânio estão atrelados à lixiviação de radionuclídeos e à emis-BECKER, 2013). Logo, a cobertura dos rejeitos com materiais secos foi defendida porMylona et al (2007) em função de conter erosão, prover estabilização química, controlar infiltrações, minimizar emissões radioativas e gerar nutrientes à vegetação. Em descomissionamento de duas barragens em Pécs, Hungria, os autores estudaram o procedimento de estabilização do rejeito fino e de retirada da água, aplicação de tela de aço e 0,5 m de areia.…”

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“…são de radiação ionizante e de gás radônio (GUNSINGER; ANDRYUCHOW;BECKER, 2013). Um dos métodos de fechamento seria a cobertura de água, a qual reduz o fluxo de radônio e evita a erosão eólica, mas não é indicada porque poderia causar contaminação por meio de infiltrações, desestabilizar o talude(MYLONA et al, 2007) e, em virtude das mudanças climáticas, sua sustentabilidade em longo prazo é questionável (GUNSINGER; ANDRYUCHOW; Já a reabilitação de uma barragem de rejeitos de urânio no leste da Alemanha utilizou somente materiais naturais com o intuito de promover estabilidade de longo prazo, consoante Merkel e Linder (2013). Estudos de campo e laboratório concluíram que havia necessidade de aceleração da consolidação do rejeito fino, a fim de criar uma superfície estável.…”

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O que significa descaracterizar barragens de rejeitos de mineração? Uma revisão sistemática da literatura

Massignan

Sánchez

2022

Eng. Sanit. Ambient.

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RESUMO Nova legislação que determina a descaracterização de barragens de rejeitos de mineração motivou esta revisão de métodos e técnicas de descaracterização e seus impactos ambientais. Foram identificados 105 artigos, publicados desde 1983, que descrevem soluções ou discutem desafios ao fechamento de barragens, quanto à estabilidade geotécnica e geoquímica, revegetação ou reutilização dos rejeitos, usualmente almejando a integração segura da barragem ao entorno. Apenas seis artigos abordam impactos ambientais das obras de descaracterização — como aumento do tráfego rodoviário —– e riscos associados à fitorremediação — particularmente a transferência de metais à cadeia alimentar. O assunto é pouco explorado na literatura internacional. Não há entendimento compartilhado sobre o significado de descaracterização, fechamento e termos relacionados. A experiência brasileira que resultará do atendimento à legislação, se devidamente analisada e documentada, contribuirá para o avanço do conhecimento e das técnicas de fechamento de barragens de rejeito.

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Elemental mobility in sulfidic mine tailings reclaimed with paper mill by-products as sealing materials

Jia

Stahre

Mäkitalo

et al. 2017

Environ Sci Pollut Res

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Sealing layers made of two alkaline paper mill by-products, fly ash and green liquor dregs, were placed on top of 50-year-old sulfide-containing tailings as a full-scale remediation approach. The performance and effectiveness of the sealing layers with high water content for an oxygen barrier and low hydraulic conductivity for a sealing layer in preventing the formation of acid rock drainage were evaluated 5 years after the remediation. The leaching behavior of the covered tailings was studied using batch leaching tests (L/S ratio 10 L/kg). The leaching results revealed that, in general, the dregs- and ash-covered tailings released relatively lower concentrations of many elements contained in acid rock drainage compared to those from the uncovered tailings. A change in the chemical composition and mineralogical state of the tailings was observed for the tailings beneath the covers. The increase in pH caused by the alkaline materials promoted metal precipitation. Geochemical modeling using PHREEQC confirmed most of the geochemical changes of the covered tailings. Both the ash and dregs showed potential to function as sealing materials in terms of their geochemical properties. However, mobilization of Zn and Ni from the lower part of the dregs-covered tailings was observed. The same phenomenon was observed for the lower part of the ash-covered tailings. Ash showed advantages over dregs as a cover material; based on geochemical studies, the ash immobilized more elements than the dregs did. Lysimeters were installed below the sealing layers, and infiltrating water chemistry and hydrology were studied to monitor the amount and quality of the leachate percolating through.

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Application of dry covers for the closure of tailings facilities

Cited by 10 publications

References 1 publication

Effect of Climate Change on a Monolithic Desulphurized Tailings Cover

Effect of Climate Change on a Monolithic Desulphurized Tailings Cover

O que significa descaracterizar barragens de rejeitos de mineração? Uma revisão sistemática da literatura

Elemental mobility in sulfidic mine tailings reclaimed with paper mill by-products as sealing materials

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