Leaching behavior of aluminum, copper, iron and zinc from cement activated fly ash and slag stabilized soils

Mahedi, Masrur; Çetin, Bora; Dayioğlu, Asli Y.

doi:10.1016/j.wasman.2019.06.018

Cited by 82 publications

(23 citation statements)

References 62 publications

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“…This study concludes The amount of fly ash required to reach acceptable limits is approximately 4-5 times higher than the lime requirement; therefore, high amounts of fly ash can be disposed of. It should be noted that fly ash may contain metals of toxicological concern, such as Cd, Cr, Co, Ni and Pb [35]; these metals may leach into the environment during the AMD neutralization process, creating additional problems. If high amounts of fly ash are used, more metals are released into the environment [23].…”

Section: Discussionmentioning

confidence: 99%

Assessment of Characteristics of Acid Mine Drainage Treated with Fly Ash

et al. 2021

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Acid mine drainage (AMD) occurs naturally in abandoned coal mines, and it contains hazardous toxic elements in varying concentrations. In the present research, AMD samples collected from an abandoned mine were treated with fly ash samples from four thermal power plants in Singrauli Coalfield in the proximate area, at optimized concentrations. The AMD samples were analyzed for physicochemical parameters and metal content before and after fly ash treatment. Morphological, geochemical and mineralogical characterization of the fly ash was performed using SEM, XRF and XRD. This laboratory-scale investigation indicated that fly ash had appreciable neutralization potential, increasing AMD pH and decreasing elemental and sulfate concentrations. Therefore, fly ash may be effectively used for AMD neutralization, and its suitability for the management of coalfield AMD pits should be assessed further.

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Section: Discussionmentioning

confidence: 99%

Assessment of Characteristics of Acid Mine Drainage Treated with Fly Ash

et al. 2021

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“…TCLP test was performed. The obtained results provide the capabilities of the stabilized materials for the potential release of the metal ions into environment, and provided proof of eco-safety, The experimental procedure was conducted according to the Toxicity Characteristic Leaching Procedure (TCLP) and U.S. EPA method 1311 (Bestgen et al, 2016;Mahedi et al, 2019).…”

Section: Leaching Experiments -Toxicity Characteristic Leaching Proce...mentioning

confidence: 99%

Bio-membrane based on modified cellulose, lignin, and tannic acid for cation and oxyanion removal: Experimental and theoretical study

Perendija

Veličković²,

Cvijetić

et al. 2021

Process Safety and Environmental Protection

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“…Technically, chalcopyrite leaching rate is mainly limited by an anodic half-reaction (Haque and Norgate, 2014;Li et al, 2018;Mahedi et al, 2019); while an investigation explored that it happened because of a cathodic half-reaction (Tshilombo, 2006). As a result of galvanic interaction between chalcopyrite and pyrite, the cathodic half-cell of the dissolution reaction (reduction of the active oxidant in the system) occurs on the pyrite particle's surface, and this mineral becomes galvanically protected, decreasing its dissolution rate (Ruiz et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Effect of externally adding pyrite and electrical current on galvanic leaching of chalcopyrite concentrate

Asgari¹,

Hassanzadeh²,

Nazari³

et al. 2021

Physicochem. Probl. Miner. Process.

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Although the operating properties of Galvanox TM leaching have been widely studied in the literature, several factors concerning chalcopyrite passivation during the process remain unknown so far. The present work hence aims at investigating the significant effect of externally added pyrite features with a particular focus on its particle size (d80 of 0.52, 20, 45 and 2000 µm) through a series of experiments performed in a 2-L stirred-tank electro-reactor. To this end, the role of pyrite: chalcopyrite ratio (0.49:1, 2:1 and 4:1) and presence of electrical current were examined while the rest of the parameters kept constant (80 °C temperature, 400-500 mV (Ag/AgCl) redox potential, pulp density of 10% (w/v), and stirring rate of 1200 rpm). Plus, kinetic models of the leaching tests were studied based on the diffusion and chemical controlling concepts. It was found that the coarser the pyrite particles, the more favorable the copper extraction from the concentrate due to acceleration of reactions in the cathodic electrode and high mass transfers. However, this was in contradiction with the existing reports in the literature. Moreover, galvanic interactions became intensive in the presence of pyrite meaning extensive chalcopyrite dissolution with significantly reduced passivation. Ultimate copper extraction values of 24.17±1.25%, 55.79±0.91% and 57.26±1.59% were resulted at Py:Cp ratios of 0.49:1 (natural), 2:1 and 4:1, respectively. The results showed that maximum copper recovery of 67.32±2.34% was obtained at an optimum condition of pyrite grain size=2000 µm, Py:Cp=4:1, current application=500 mA, 8 h and 80 °C. Finally, detailed kinetic modeling indicated that the chemical control mechanism was dominant in the early reaction stages (t<3.5 h) concerning the availability of fresh surface for chemical agents; however, the second half of the process (8.0 h>t>3.5 h) was controlled by the diffusion control.

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Leaching behavior of aluminum, copper, iron and zinc from cement activated fly ash and slag stabilized soils

Cited by 82 publications

References 62 publications

Assessment of Characteristics of Acid Mine Drainage Treated with Fly Ash

Assessment of Characteristics of Acid Mine Drainage Treated with Fly Ash

Bio-membrane based on modified cellulose, lignin, and tannic acid for cation and oxyanion removal: Experimental and theoretical study

Effect of externally adding pyrite and electrical current on galvanic leaching of chalcopyrite concentrate

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