Rare earth and trace elements enrichment and implications in black shales of Safaga-Qussier sector, Egypt

El‐Anwar, Esmat A. Abou; Abdelhafiz, Mahmoud A.; Salman, Salman

doi:10.1016/j.jafrearsci.2022.104482

Cited by 7 publications

(1 citation statement)

References 41 publications

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“…Black shales can also be considered as secondary resource for these valuable metals. Recently, El-Anwar et al [26] reported REE enrichment (average 255.3-325.3 µg/g) in black shales of the Safaga-Qussier sector, Egypt. Another , such study is reported from the rock-soil-moss system in the black shale area in China with an average concentration of ∑REE around 245 µg/g [27].…”

Section: Secondary Depositsmentioning

confidence: 99%

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Balaram¹

2023

Preprint

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Currently, there is increasing industrial demand for rare earth elements (REE) as these elements are now integral to the manufacture of many carbon-neutral technologies. The depleting REE ores and increasing mining costs are prompting to look for alternative sources for these valuable metals, particularly from waste streams. Although REE concentrations in most of the alternate resources are lower than current REE ores, some sources such as marine sediments, coal ash, and industrial wastes like red mud are looking promising with significant concentrations of REE in them. This review focuses on the alternative resources for REE such as ocean bottom sediments, continental shelf sediments, river sediments, stream sediments, lake sediments, phosphorites deposits, industrial waste products like red mud, and phosphogypsum, coal, coal fly ash, and related materials, waste rock sources from old and closed mines, acid mine drainage, and recycling of e-waste. Possible future Moon exploration and mining for REE and other valuable minerals are also discussed. It is evident that REE extractions from both primary and secondary ores alone are not adequate to meet the current demand, and sustainable REE recovery from the alternative resources described here is also necessary to meet the growing REE demand. An attempt is made to identify the potential of these alternative resources and sustainability challenges, benefits, and possible environmental hazards to meet the growing challenges in meeting the future REE requirements.

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Section: Secondary Depositsmentioning

confidence: 99%

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Balaram¹

2023

Preprint

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Urban geochemistry of heavy metals in road dust from Cairo megacity, Egypt: enrichment, sources, contamination, and health risks

Mostafa,

El-Nady,

Gomaa

et al. 2023

Environ Earth Sci

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Traffic emissions, overpopulation, and poor urban planning have degraded the environmental quality of the Greater Cairo megacity. As road dust is considered the main sink of pollutants in urban environments, thirty road dust samples from six major roads were collected. ICP-OES was used to analyze the samples in order to determine the contamination grade using the pollution indices, decipher metal sources and geochemical associations using multivariate analysis, and evaluate the ecological and human health risks. The average contents of heavy metals were arranged in decreasing order: Fe (1181.12), Zn (201.36), Pb (66.10), Ni (32.42), Cu (26.07), Cr (26.00), Co (14.78), As (2.76), and Hg (0.93) mg/kg. The spatial pattern showed that new urban communities exhibited lower contamination levels compared to unplanned old districts, especially for traffic elements (Pb, Zn, and Cu). The highest Igeo mean value was observed for Hg (3.34) followed by Zn (1.34), Pb (1.24), Ni (0.10), As (− 0.19), Co (− 0.24), Cu (− 0.73), and Cr (− 1.05). Additionally, CF values indicated very high contamination levels for Pb and Zn, whereas the highest PLI value was observed at Ramses Street. All EF values were higher than 1.5, indicating the anthropogenic enrichment of metals. RI values classified Cairo as a region with considerable ecological risk, observing that Hg was the main contributor. Correlation analysis and PCA showed that Pb and Zn originated from vehicle exhaust, Hg, Cu, and As from domestic and industrial activities, and Fe and Co from natural origin. Cr and Ni exhibited potential carcinogenic risks for children through ingestion; conversely, the non-carcinogenic risks were within safe levels. As a result, the use of clean energy is recommended to mitigate the accumulation of heavy metals in road dust and to improve the quality of life.

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Geochemical and mineralogical analysis of the Upper Cretaceous dolomitic phosphates at Queih Mine, Quseir, Central Eastern Desert, Egypt: depositional environment implications and pollution indices

Abou El‑Anwar,

Belal,

Salman

et al. 2023

Carbonates Evaporites

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Soon for the security of phosphorus world supply, which comes primarily from non-renewable sources, the moderate carbonate phosphates will need further geochemical multidiscipline investigations to participate in the phosphorous supply chains necessary to increase human productivity. Dolomitic phosphates represented the main carbonate phosphate rocks of the Upper Member of Duwi Formation, at Um Queih Mine, South-Western Quseir, that phosphate can be classified as intermediate grade phosphate ore. It was enriched in V, Ni, Mo, U, Cu, Cr, Cd, Co as well as Zn and their ratios indicated that the deposition occurred in anoxic environment (reducing conditions). Mineralogical investigations indicated that the studied phosphorites are composed of two main mineral phases; fluorapatite and non-phosphatic minerals (dolomite, calcite, pyrite, gypsum, and quartz). The petrographic examination revealed that these phosphorites are composed of phosphatic lithoclasts, phosphatic bioclasts, opaques, and quartz grains embedded in a cryptocrystalline phosphatic matrix. The parent rocks of the studied phosphorites represented by basaltic mafic provenance were affected by low chemical weathering and deposited under marine anoxic environment. The mineralogical and geochemical characteristics indicated that the studied phosphorites deposited in marine anoxic condition. The weathering of these rocks can be harmful to the surrounding environment owing to its content of pyrite and potentially toxic elements (PTEs), the EF (enrichment factor) gives extremely high enriched with Mo, Cd, and Se.

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Rare earth and trace elements enrichment and implications in black shales of Safaga-Qussier sector, Egypt

Cited by 7 publications

References 41 publications

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Urban geochemistry of heavy metals in road dust from Cairo megacity, Egypt: enrichment, sources, contamination, and health risks

Geochemical and mineralogical analysis of the Upper Cretaceous dolomitic phosphates at Queih Mine, Quseir, Central Eastern Desert, Egypt: depositional environment implications and pollution indices

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