Inhibition of acid generation from sulphidic wastes by the addition of small amounts of limestone

Mylona, Evangelia; Xenidis, Anthimos; Paspaliaris, Ioannis

doi:10.1016/s0892-6875(00)00099-6

Cited by 52 publications

(19 citation statements)

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“…The result indicates that the weak alkaline environment of the extractant did not change. Thus, it can be deduced that the Fe precipitate may be ferrihydrite or hydroxide and the Cu, Mn, Ni, and Zn precipitates may be hydroxide according to the previous researches [44,45].…”

Section: Released Amounts Of Heavy Metals Under Different Soaking Timmentioning

confidence: 96%

“…With the increase of soaking time, a small released amount (i.e., 0.05 mg¨kg´1 (8 h)) appeared, and the released amounts remained stable in the range of 0.05-0.08 mg¨kg´1 until the end of the experiment. The added calcium carbonate in tailings can consume hydrogen ions and increase the alkalinity of the soaking liquor [42][43][44]. In the experiment, the amount of added calcium carbonate was excessive through neutralization reaction calculation.…”

Section: Released Amounts Of Heavy Metals Under Different Soaking Timmentioning

confidence: 98%

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Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments

et al. 2016

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Abstract:To provide the basic information about the release of heavy metals from the pyrite tailings of Huangjiagou pyrite mine, the pyrite tailings were investigated through a series of batch experiments under different initial pH of extractant, temperature, liquid-solid (LS) ratio, and soaking time conditions. Moreover, calcium carbonate was added in the pyrite tailings to determine the reduction effect on the release of heavy metals. The results show that Fe, Cr, Cu, Mn, Zn, and Ni were the major heavy metals in the pyrite tailings. Low initial pH and high LS ratio significantly promoted Fe, Cu, Mn, Ni, and Zn release, and high temperature significantly promoted Fe, Cu, Mn, and Ni release. Only small amounts of Cr were detected at low LS ratios. With the increase of soaking time, the released amount of Fe, Cu, Mn, Ni, and Zn increased to the maximum value within 48 h, respectively. After adding calcium carbonate, the released amounts of Fe, Cu, and Zn reduced at least 70.80% within 48 h soaking time. The results indicate that summer and the early soaking stage are the main phases for the release of heavy metals from the pyrite tailings. In the pyrite tailings, Cr is difficult to release. Adding calcium carbonate can effectively reduce the release of Fe, Cu, and Zn.

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Section: Released Amounts Of Heavy Metals Under Different Soaking Timmentioning

confidence: 96%

Section: Released Amounts Of Heavy Metals Under Different Soaking Timmentioning

confidence: 98%

Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments

et al. 2016

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“…Another potential method for impeding oxidation of sulfide minerals is to top-dress acid neutralizing materials on the drying tailings materials to halt pH drop (Mylona et al, 2000;Mata et al, 2002). This reduces the level of aqueous Fe 3+ that triggers catalyzed oxidation of sulfide minerals (Moses et al, 1987;Rimstidt and Newcomb, 1993;Janzen et al, 2000).…”

Section: Underwater-stored Mine Tailingsmentioning

confidence: 99%

Climate Change Adaptation in Acid Sulfate Landscapes

Lin¹

2012

American Journal of Environmental Sciences

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Oxidation of sulfide minerals produces sulfuric acid and consequently creates Acid Sulfate Landscapes (ASLs), which represent one of the most degraded types of land-surface environments. Although acid sulfate-producing weathering is a naturally occurring process, it is markedly facilitated by human intervention. Mining is by far the dominant anthropogenic cause for the creation of inland acid sulfate footprints while land reclamation in coastal lowlands is the driver for the formation of coastal ASLs. The projected climate change highlights the possibility of an increase in the frequency and severity of extreme weather events such as droughts and heavy rains, which is likely to accelerate the acid generation in some circumstances and increase the frequency and magnitude of acid discharge. Sea level rise as a result of global warming will cause additional problems with the coastal ASLs. This is a review article. The following aspects are covered: (a) the overriding biogeochemical processes leading to acid sulfateproducing weathering, (b) a brief introduction to the inland acid sulfate landscapes, (c) a brief introduction to the coastal acid sulfate landscapes, (d) the likely impacts of climate change on ASLs and (e) the possible measures to combat climate change-induced environmental degradation in the identified key acid sulfate footprints. The projected climate change is like to significantly affect the acid sulfate landscapes in different ways. Appropriate management strategies and cost-effective technologies need to be developed in order to minimize the climate change-induced ecological degradation.

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“…Les carbonates de calcium (et de magnésium, dans une moindre mesure) sont les matériaux les plus communément utilisés comme amendement alcalin (e.g. Lapakko et al, 1997 ;Mylona et al, 2000). Cependant, le calcaire est une ressource coûteuse, et son efficacité peut être limitée dans le temps par sa faible solubilité et le développement d'une couche d'hydroxydes sur les surfaces, suite aux réactions de neutralisation (Skousen, 2001;Pérez-López et al, 2007).…”

Section: -Stockage En Surface Amendements Alcalinsunclassified

Les effets d’amendements alcalins sur des résidus miniers sulfureux entreposés en surface : Cas des dépôts en pâte

Deschamps¹,

Benzaazoua²,

Bussière³

et al. 2009

Environnement, Ingénierie &Amp; Développement

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Tailings that cannot be returned underground as backfill during the mining operation are deposited at the surface, generally in tailings ponds. These structures, often surrounded by large embankments, can be difficult to manage and costly to restore. When tailings are used as cemented paste backfill destined to backfilling underground stopes, they are mixed with a binder. One of the alternatives to conventional surface storage of tailings is the disposal of these materials in a paste-like consistency, known as surface paste tailings (SPT). SPTs are obtained by thickening the tailings to a pulp density that still allows transportation to the storage location. SPTs are typically deposited without any amendments. However, cement or other alkaline amendments can be a solution to prevent generation of acid mine drainage (AMD), and to improve the hydrogeochemical and geotechnical performance of the tailings. Surface disposal of paste tailings has many advantages, as there is little or no free water, which, for instance, may limit the need to build large containment embankments. Another advantage of thickening tailings is increasing water recirculation to the process plant. The mechanical properties of the paste tailings can also simplify site restoration. In certain conditions, SPTs could constitute an efficient way of reducing AMD due to their capacity to maintain a high saturation level, thus limiting oxygen ingress and consequently the generation of acidic water. Let us recall that AMD occurs when sulphide minerals are exposed to water and air (oxygen).This presentation first reviews the effects of alkaline amendments in AMD-generating mine tailings. It then compares them to SPTs, with a focus on binder addition to these materials. The hydrogeochemical performance of the surface paste tailings is presented at two laboratory scales: column and physical intermediate model. The results of these studies found in the literature show that adding cement can be beneficial under certain conditions but that it must be carried out according to certain specifications. Suggestions pertaining to the use of cement in SPTs are also discussed. Les rejets de concentrateur qui ne sont pas retournes sous terre sous forme de remblais pendant l’exploitation d’une mine sont entreposés en surface dans des parcs à résidus. Ces derniers, souvent ceintures de digues, peuvent être complexes à gérer et coûteux à restaurer. Pour leur part, les résidus entreposés sous terre peuvent être utilisés pour former des remblais miniers en pâte cimentés. Dans ce cas, les résidus sont mélangés avec un liant, et ils peuvent servir au remblayage de chantiers souterrains. Une technique analogue constitue maintenant l’une des alternatives à l’entreposage conventionnel en surface des rejets de concentrateur ; on parle alors de « dépôt en pâte de surface » (DPS), ou de résidus en pâte. Les DPS sont obtenus en épaississant les rejets de concentrateur jusqu’à une consistance permettant leur transport de l’usine de fabrication jusqu’au lieu de l’entreposage. La technique des DPS offre de nombreux bénéfices potentiels, découlant entre autres du fait qu’il n’y a pas (ou peu) d’eau libre. Il n’est donc pas nécessaire de construire d’importantes digues de confinement. Un autre avantage de l’épaississement des résidus est d’augmenter la recirculation de l’eau au concentrateur. De plus, les propriétés mécaniques supérieures des résidus en pâte peuvent faciliter la gestion et la restauration du site. Les DPS pourraient aussi constituer une méthode efficace pour réduire la production de DMA, en aidant à maintenir un degré de saturation élevé dans les résidus, ce qui limite l’accessibilité de l’oxygène et, par conséquent, la génération d’eau acide. Rappelons que le DMA se produit lorsque des minéraux sulfureux sont exposés à l’eau et à l’air (oxygène). Les résidus en pâte sont habituellement déposés sans ajout cimentaire. Toutefois, des études récentes montrent que l’ajout de ciment ou d’autres amendements alcalins, peut réduire la génération de DMA par l’amélioration du comportement hydrogéochimique et géotechnique des rejets. Cet article présente, dans un premier temps, une revue sur les effets d’amendements alcalins dans les résidus miniers générateurs de DMA. Ensuite, on fera un rapprochement avec les DPS, en particulier lorsque des ajouts cimentaires sont utilisés. L’accent sera mis sur le comportement hydrogéochimique de la pâte, suite à des essais menés au laboratoire à différentes échelles. Ces différentes études issues de la littérature démontrent principalement que l’effet de l’ajout cimentaire peut être bénéfique dans certaines conditions, mais qu’il doit se faire sous certaines conditions. Des suggestions et recommandations sont proposées comme suite à cette étude sur l’utilisation de ciment dans les DPS.

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Inhibition of acid generation from sulphidic wastes by the addition of small amounts of limestone

Cited by 52 publications

References 13 publications

Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments

Release of Heavy Metals from the Pyrite Tailings of Huangjiagou Pyrite Mine: Batch Experiments

Climate Change Adaptation in Acid Sulfate Landscapes

Les effets d’amendements alcalins sur des résidus miniers sulfureux entreposés en surface : Cas des dépôts en pâte

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