Chemical, mineralogical and rare earth elements distribution study of phosphorites from Sra Ouertane deposit (Tunisia)

Bouabdallah, Mariem; Elgharbi, Sarra; Horchani−Naifer, Karima; Barca, Donatella; Fattah, Nabil; Férid, Mokhtar

doi:10.1016/j.jafrearsci.2019.05.013

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…Generally, the occurrence and distribution of PTMs are strongly influenced by several rock components (i.e., CFA, matrix, and accessory minerals) (e.g., [10,64]). The incorporation of PTMs can occur due to ionic isomorphic substitutions that take place in the apatite lattice (i.e., replacement of Ca 2+ cation by several PTMs), and also, via adsorption onto the surfaces of minerals (e.g., [8,65,66]).…”

Section: Potentially Toxic Metals Compositionmentioning

confidence: 99%

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Environmental Geochemistry of Potentially Toxic Metals in Phosphate Rocks, Products, and Their Wastes in the Algerian Phosphate Mining Area (Tébessa, NE Algeria)

et al. 2023

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This study is focused on the environmental geochemistry of potentially toxic metals (PTMs)-bearing products and wastes in a mining area in Djebel Onk (NE Algeria) and their potential ecological and health risk assessment. Representative samples from (i) commercial products and (ii) grain size classes of wastes were mineralogically characterized using X-ray diffraction. The major and PTMs elements in the samples were chemically analyzed via ICP-AES and ICP-MS, respectively. The results reveal that the samples were mostly composed of carbonate fluorapatite (P2O5 > 24 wt %) and yielded PTM concentrations within the average range of phosphorites in neighboring countries and worldwide deposits as well. The concentrations of V, Cd, As, Ni, and Pb in the products were found to be within the acceptable values according to various standards, such as the Canadian and German Fertilizer Ordinance policies. Geochemically, PTMs distribution is linked to the main sub-composition of phosphate rock (apatite, clay, and dolomite). The Enrichment Factors (EF) display very-high-to-extremely-high enrichment of PTMs (Cr, Zn, As, Sr, Mo, Cd, Sb, Tl, Th, and U), while V, Co, Cu, Ni, Zr, Ga, Nb, and Pb show minor and moderate-to-high enrichments. Among all the PTMs, Cd, Tl, and U display a very high ecological risk (PERI) and contribute most to the total risk index (RI). The human health risk assessment of PTMs represented by the Hazard Index (HI) indicates that the non-carcinogenic risks are below the threshold values (HI < 1), while the HI values are higher for children than they are for adults. However, the cancer index (life time cancer risk) for Cr, Ni, As, and Cd for children and Cd for adults is greater than the acceptable threshold. These results are useful for phosphate beneficiation via removing these PTMs from the commercial product for efficient waste management.

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Section: Potentially Toxic Metals Compositionmentioning

confidence: 99%

“…Remarkably, the samples with the highest U content also yield the highest P 2 O 5 amounts, which indicates a strong relationship between both elements. Note that U is known to be easily incorporated into the apatite lattice [7,11,64,69].…”

Section: Potentially Toxic Metals Compositionmentioning

confidence: 99%

Environmental Geochemistry of Potentially Toxic Metals in Phosphate Rocks, Products, and Their Wastes in the Algerian Phosphate Mining Area (Tébessa, NE Algeria)

et al. 2023

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“…The few works carried out in Tunisia on REEs concerned mainly the phosphatic series (Ounis et al, 2008;Garnit et al, 2012Garnit et al, , 2017Bouabdallah et al, 2019) and the Oued Bélif belt breccia (Decrée et al, 2013(Decrée et al, , 2014, hence the importance of conducting further studies in the future to try to separate these REEs from the gangue for possible exploitation. Tlig and Steinberg (1980), proved that the REE spectra of the Late Jurassic and Lower Cretaceous clays of southern Tunisia are very close to those of the Callovian clays and show a slight impoverishment in heavy REEs.…”

Section: Geochemical Evolution Of the Rees In The Studied Domainsmentioning

confidence: 99%

“…REEs are therefore relatively immobile and their concentrations are great in detrital phyllosilicates and low in natural solutions. The few previous works carried out in Tunisia on REEs concerned mainly the phosphatic series (Ounis et al, 2008;Garnit et al, 2012Garnit et al, , 2017Bouabdallah et al, 2019) and the Oued Bélif belt breccia (Decrée et al, 2013(Decrée et al, , 2014. Hence, it is important to conduct further studies in an attempt to separate these REEs from the gangue for possible exploitation.…”

Section: And Table 2)mentioning

confidence: 99%

Distribution of rare earth elements of Tunisian margin clays

Jamoussi

Galindo

2022

Clay miner.

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“…Moreover, Donatello et al [46] studied seven different samples of incinerated BSS ash (precisely FA) and evaluated a P content of 5.7-7.8%. This P content was decidedly lower than usual content in the minerals (e.g., phosphorites and apatite) used as source to extract P [47][48][49][50]. However, it was considerable and could make this waste a sustainable alternative source to produce phosphate fertilizers.…”

Section: Fa and Ba Characterizationmentioning

confidence: 99%

Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge

Baldi

Martinotti

Sorlini

et al. 2021

Water

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Phosphorus depletion represents a significant problem. Ash of incinerated biological sewage sludge (BSS) contains P, but the presence of heavy metals (e.g., Fe and Al) is the main issue. Based on chemical characterization by SEM-EDS, ED-XRF and ICP-OES techniques, the characteristics and P content of bottom ash (BA) and fly ash (FA) of incinerated BSS were very similar. On BA, P extraction carried out in counter- current with an S:L ratio of 1:10 and H2SO4 0.5 M led to better extraction yields than those of a similar test with H2SO4 1 M and an S:L ratio of 1:5 (93% vs. 86%). Comparing yields with H2SO4 0.5 M (S:L ratio of 1:10), the counter-current method gave better results than those of the crossflow method (93% vs. 83.9%), also improving the performance obtained with HCl in crossflow (93% vs. 89.3%). The results suggest that the purification of the acid extract from heavy metals with pH variation was impractical due to metal precipitation as phosphates. Extraction with H2SO4 and subsequent treatment with isoamyl alcohol represented the best option to extract and purify P, leading to 81% extraction yields of P with low amounts of metals.

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Chemical, mineralogical and rare earth elements distribution study of phosphorites from Sra Ouertane deposit (Tunisia)

Cited by 11 publications

References 28 publications

Environmental Geochemistry of Potentially Toxic Metals in Phosphate Rocks, Products, and Their Wastes in the Algerian Phosphate Mining Area (Tébessa, NE Algeria)

Environmental Geochemistry of Potentially Toxic Metals in Phosphate Rocks, Products, and Their Wastes in the Algerian Phosphate Mining Area (Tébessa, NE Algeria)

Distribution of rare earth elements of Tunisian margin clays

Extraction and Purification of Phosphorus from the Ashes of Incinerated Biological Sewage Sludge

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