Effects of seawater mixing on the mobility of trace elements in acid phosphogypsum leachates

Papaslioti, Evgenia-Maria; Pérez‐López, Rafael; Parviainen, Annika; Sarmiento, Aguasanta Miguel; Nieto, José Miguel; Marchesi, Claudio; Huertas, António Delgado; Garrido, Carlos J.

doi:10.1016/j.marpolbul.2018.01.001

Cited by 36 publications

(18 citation statements)

References 23 publications

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“…Batch leaching test was used as a handy tool to assess the mobility of major and trace elements according to the description of Papaslioti et al [35]. Briefly, batch leaching test was performed by using ultra-pure water (UPW) as leachate.…”

Section: Batch Leaching Testsmentioning

confidence: 99%

Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Zmemla

Sdiri

Naifar

et al. 2019

Environmental Engineering Research

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This study has been carried out to evaluate the leaching behavior of Tunisian phosphogypsum (PG) tailings in Skhira city (southern Tunisia). Two PG samples, including old and freshly deposited samples, were characterized in terms of physical, geotechnical, mechanical, chemical and mineralogical properties. Special attention was paid to their leaching behavior when subjected to standard leaching tests. Our results indicated that both samples are mainly composed of more than 31.85% CaO and 31.4% SO3, indicating the predominance of gypsum. This was further confirmed by XRD patterns that revealed the presence of characteristic reflections of gypsum, brushite, quartz and Maladrite. Compressive strength after 90 d exceeded 769 kPa, but still lower than that of natural sand (1,800 kPa). Leaching test was proposed as an appropriate method to determine the released contaminants from PG. The obtained results showed that Fluorine and Phosphorus are the most released elements from PG with 40 and 30%, respectively. The released Se, Cd, and Zn were the only trace elements that exceeded the threshold limits. It seemed that leached element concentrations were independent aging or particle size of the PG. Based on the assessment of leaching behavior, an integrated management approach of the PG deposits was proposed.

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Section: Batch Leaching Testsmentioning

confidence: 99%

Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Zmemla

Sdiri

Naifar

et al. 2019

Environmental Engineering Research

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“…The latest research shows that phosphogypsum can also be used for soil improvement, and the improvement effect is remarkable (Enamorado et al 2014;Hentati et al 2015;Mao et al 2016). Similar to HMNS, a large number of PG also occupy a lot of open space, causing pollution to local groundwater (Li et al 2017;Papaslioti et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Study on Physical and Chemical Properties of High Magnesium Nickel Slag-Phosphogysum Composite Cementitious Materials in Different Particle Sizes

Wang

Zhang

et al. 2020

ACT

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High-magnesium nickel slag (HMNS) and phosphogypsum (PG) are hazardous industrial solid waste. The present work focuses on the feasibility of using the two materials as supplementary cementitious materials (SCM) added to cement. The slag and gypsum were ground into different specific surface area (2235 cm 2 /g, 3040 cm 2 /g and 3900 cm 2 /g), then mixed into ten different samples. The effect of SCM addition was detected by isothermal conduction calorimetry (ICC) testing, compressive strength, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), scanning electron microscope (SEM) and linear shrinkage. The results showed that the HMNS-PG composite cementitious material with suitable specific surface area has relatively high activity, and a small amount of gel and alumina-ferric oxide-trisulfate (AFt or ettringite) are detected in HMNS-PG composite cementitious material. According to the results, the high-magnesium nickel slag could be together with phosphogypsum as substitutes for cement, improved the utilization rate of industrial waste and reduced environmental pollution.

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“…It is accumulated in large stockpiles which occupy vast land areas and then discharged into the sea when pile is full [8]. The discharge causes environmental damage when they interact with aquatic environments [9,10].…”

Section: Introductionmentioning

confidence: 99%

Phosphogypsum waste as additives to lime stabilization of bentonite

Oumnih

Bekkouch

Gharibi

et al. 2019

Sustain Environ Res

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Waste recycling with increasing the lifecycle of resource is a novel approach for enhancing circular economy. Within this context, this study aims to give a second life cycle to phosphogypsum (PG) waste, which is a byproduct from phosphoric acid manufacture, as useful resources. This study evaluates the sustainability of this harmful waste, which is accumulated in large stockpiles and becomes hazardous during storage, and to stabilize bentonite-based concrete intended for road construction. The effect of raw bentonite (Ca-Na montmorillonite), PG, and lime on the properties of cementitious materials has been investigated through various tests. The properties examined include chemistry (X-ray Fluorescence Spectrometry), mineralogy (X-ray Powder Diffraction and Fourier-Transform Infrared Spectroscopy), calorimetry (Differential Thermal Analysis/Thermogravimetry) and microstructure (Scanning Electron Microscopy) of the mortar based on different mixtures of bentonite, PG and lime. The result show that lime and PG addition involves in the formation of new nanocrystalline phases and the disappearance of certain minerals as portlandite. Calcium silicate hydrate gel appeared in the mixture with 8% of lime, whereas strätlingite was neoformed in the mixture with 8% of lime and 8% of PG. These nanocrystalline phases are responsible for enhancing mechanical strength through the pozzoloanic reaction.

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Effects of seawater mixing on the mobility of trace elements in acid phosphogypsum leachates

Cited by 36 publications

References 23 publications

Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Tunisian phosphogypsum tailings: Assessment of leaching behavior for an integrated management approach

Study on Physical and Chemical Properties of High Magnesium Nickel Slag-Phosphogysum Composite Cementitious Materials in Different Particle Sizes

Phosphogypsum waste as additives to lime stabilization of bentonite

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