Reprocessing feasibility of polymetallic waste rock for cleaner and sustainable mining

Amar, Hicham; Benzaazoua, Mostafa; Edahbi, Mohamed; Villeneuve, Mathieu; Joly, Marc-Andre; Elghali, Abdellatif

doi:10.1016/j.gexplo.2020.106683

Cited by 20 publications

(8 citation statements)

References 37 publications

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“…In the heat‐stable salt, the sulfate amine salt coexists with SO 4 2− , Cl − , NO 3 − , and NO 2 − as well as organic anions including CH 3 CH 2 COO − , CH 3 COO − , and HCOO − . The heat‐stable salt has two major negative impacts on the desulphurization process 59 : (1) The heat‐stable salt cannot be thermally regenerated, so it will directly lead to the loss of organic amines, reduce the desulphurization efficiency and increase the cost of organic amine raw materials, which will not only cause secondary pollution but also lead to the waste of resources; (2) The accumulation of heat‐stable salt in the desulphurization agent will lead to an increase in fluid viscosity, which will result in bulging and liquid flooding, affecting the stability of the operation, and in serious cases, it will directly lead to the stoppage of the desulphurization operation. The BMED process regenerates heat‐stable salts while converting anions into acid byproducts.…”

Section: Stacked Electro‐membranes Reactormentioning

confidence: 99%

Electro‐membrane reactor: A powerful tool for green chemical engineering

et al. 2023

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Electro‐membrane reactors use electro‐membranes for preferentially diffusive/electrophoretic migration or electroosmotic separation of in‐situ reactive products, thereby maximizing the reaction rate and transport efficiencies of the products. These reactors are widely employed in the chemical engineering sectors such as green chemical synthesis, biorefining, electrocatalytic reduction/oxidation, and water treatment. In this review article, we provide an overview of the recent advances in three categories of electro‐membrane reactors in chemical engineering sectors from three categories: (1) Electro‐membrane reactors based on stacked ion‐exchange membranes for resources recovery; (2) Electro‐membrane reactors via Faraday reactions on functional anodes/cathodes for substance transformation; and (3) Closed‐loop chemical reactions and substance separation via coupling of Faraday reactions and stacked membranes. The increasing demand for low‐carbon economy has accelerated the advancement of environmentally friendly chemical engineering and sustainable processes and necessitates the use of electro‐membrane processes. The macro perspective provides a timely reference for researchers and engineers.

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Section: Stacked Electro‐membranes Reactormentioning

confidence: 99%

Electro‐membrane reactor: A powerful tool for green chemical engineering

et al. 2023

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“…Stotal is expected to correspond to sulphide sulphur given the fresh state of the solids preserved in dry conditions before In previous works, kinetic assessment was undertaken on 11 ground drill core samples from Akasaba West with D 50 ranging from 370 to 560 µm; all leachates maintained neutral to slightly alkaline pH values [77]. In the present study, the drill core samples were ground to less than 100 µm to deliberately expose thinly disseminated sulphides to favor optimal reaction conditions with the chosen kinetic test apparatus [36,78]. The specific gravity (Gs) of the homogenized composite samples was measured with a Micromeritics Helium Pycnometer (Quantachrome corporation, Unité de Recherche et de Service en Technologie Minérale URSTM, Rouyn-Noranda, QC, Canada).…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

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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“…The extraction and processing of ore result in large amounts of mine waste materials, including tailings, metallurgical wastes and waste rock (Lottermoser., 2011;Tayebi-Khorami et al, 2019). Mine waste materials can potentially present economic prospects for re-use and re-mining, but can also cause severe damage and contamination to the environment if stored improperly (Jamieson et al, 2015;Ettler, 2015;Falagán et al, 2017;Karaca et al, 2017;Ceniceros-Gómez et al, 2018;Helser and Cappuyns, 2021;Amar et al, 2021). Sulphidic mine waste materials have the potential to produce Acid Rock Drainage (ARD) and leach toxic elements into the environment when exposed to oxidising conditions, with negative effects on the environment and human health (Environment Agency, 2009).…”

Section: Introductionmentioning

confidence: 99%