Revue de littérature détaillée sur les tests statiques et les essais cinétiques comme outils de prédiction du drainage minier acide

Bouzahzah, Hassan; Benzaazoua, Mostafa; Bussière, Bruno; Plante, Benoît

doi:10.4267/dechets-sciences-techniques.340

Cited by 6 publications

(8 citation statements)

References 23 publications

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“…The prediction of the environmental behavior of the GMWR samples was performed through the static test called acid-base accounting (ABA) [50,51], which provides important information to decide on the nature of the acidity of the mining wastes and therefore on their potential risk to the environment.…”

Section: Evaluation Of Acid Generation Potentialmentioning

confidence: 99%

Manufacture and Characterization of Fired Bricks from Gold Mine Waste Rocks

et al. 2021

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The purpose of this research was to evaluate the possibility of using gold mine waste rocks (GMWRs) as alternative raw material for the manufacturing of fired bricks. The feasibility study was assessed through (i) physical, chemical, mineralogical and environmental characteristics of GMWRs; (ii) determination of the natural clay (NC) substitution effect when using GMWRs; (iii) the effect of the firing temperature on the mechanical and physical properties of the fired bricks. Five mixtures of NC and GMWRs were studied. The percentages of substitution of NC with GMWRs varied from 0 to 100%. The brick specimens were fired at 900 °C, 1000 °C and 1050 °C. The results show that increasing the firing temperature improved the flexural strength and density of the bricks, while the substitution of NC with GMWRs caused a reduction in the mechanical resistance of the bricks and an increase in their porosity and, consequently, their water absorption rate. However, the properties of bricks that contained up to 80 wt% of GMWRs and fired at 1000 °C and 1050 °C satisfied the requirements set by the applicable civil engineering and environmental standards. This was found to be an efficient and sustainable solution to mitigate environmental hazards and better manage mining wastes, concurrently producing marketable products from them, which is in accordance with the circular economy concept.

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Section: Evaluation Of Acid Generation Potentialmentioning

confidence: 99%

Manufacture and Characterization of Fired Bricks from Gold Mine Waste Rocks

et al. 2021

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“…The NP was quantified after one week of acid digestion to stimulate low-reactive neutralizing minerals as suggested by Bouzahzah et al [82]. The NP was also estimated based on the C total content as shown in Equation (1) assuming that C total stems from carbonates (CNP) [84]. Similarly, the acidic potential (AP) was calculated by assuming that all the sulphide sulphur belongs to pyrite that will oxidize and generate acidity, as expressed by equation (2) [84].…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…Thereafter, the net neutralization potential (NNP in kg CaCO 3 /t; NNP = NP−AP) and the NP/AP ratio were computed for interpretation [25,38,70,84].…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…The weathering cell concept was first developed by Cruz et al [71] to assess pyrite oxidation by leaching 20 g of pyrite with 15 mL of leaching solution. Thereafter, the test was adjusted by increasing the sample mass to 67 g and maintaining the same liquid to solid ratio used by Cruz et al [28,71,84,85]. Weathering cell testing is a cost-effective method largely used during the upstream geochemical assessment for its ease of implementation and limited manipulation requirements; more importantly, weathering cells cope with material-restrained situations.…”

Section: Weathering Cell Testmentioning

confidence: 99%

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Incorporating Kinetic Modeling in the Development Stages of Hard Rock Mine Projects

Toubri

Vermette²,

Demers

et al. 2021

Minerals

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Weathering cell test, designed specifically to overcome material-limited constraints, yields prompt and efficient experimental assessment during the development stages of mining projects. However, it has barely benefited from geochemical modeling tools despite their ease of use. Accordingly, this paper aims to strengthen the upstream geochemical assessment via parametric analysis that simulates the effect of various mineral assemblages on leachate quality recovered from weathering cells. The main objective is to simulate the pH in presence of silicate neutralizing minerals and Mn release from carbonates based upon minimal characterization data. The public domain code PHREEQC was used for geochemical kinetic modeling of four weathering cells. The kinetic model utilized a water film concept to simulate diffusion of chemical elements from mineral surfaces to the pore water. The obtained results suggest that the presence of the silicate neutralizing minerals slightly affects the Mn release from carbonates. Furthermore, plagioclases could supply a significant neutralization potential when they predominate the mineral assemblage. Finally, coupling weathering cell test and parametric analyses illuminate the pH evolution for various mineral proportion scenarios.

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“…Pour ce faire, le potentiel de génération d'acide (PGA) qui conditionne les manières de gérer les rejets miniers et la restauration des sites d'entreposage doit être prédit de manière précise par les outils de prédiction disponibles et qui sont les tests statiques et les essais cinétiques. Or, dans la pratique, il existe de nombreuses variantes chimiques et minéralogiques des tests statiques et la prédiction qu'ils permettent de donner peut être différente selon les différents protocoles (auteurs) et selon que l'on utilise le pouvoir net de neutralisation (PNN) ou le rapport PN/PA pour la classification des rejets miniers en termes de leur PGA (Bouzahzah 2013a;Bouzahzah et al 2014b). D'autre part, les critères de classification (PNN et PN/PA) des tests statiques sont caractérisés par une zone où il est difficile de classer avec certitude certains rejets miniers.…”

Section: Introductionunclassified