Radiometric and environmental impacts of mill tailings at experimental plant processing unit, Allouga, Egypt

Harpy, Nareman; Dabour, S. E. El; Sallam, Al-Aliaa M.; Nada, Ayman; Aassy, A. E. El; Feky, M. G. El

doi:10.1080/15275922.2019.1695020

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…The calculated values of the studied zones are 540, 297, 2269 and 224 nGyh -1 for outer, intermediate, altered and inner zones respectively. These estimated values of absorbed γdose rate in the studied samples are comparably higher than the world average value 57 nGyh -1 (Harpy et al 2019b;Taha et al 2020). This indicates the presence of harmful effects.…”

Section: Activity Concentration Index (Iγ)mentioning

confidence: 48%

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Environmental radioactivity of pegmatites associating younger granite of Ras Baroud area, Central Eastern Desert, Egypt.

2020

The Egyptian Journal of Environmental Change

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Ras Baroud pluton is one of the well exposed granitic batholiths in the Central Eastern Desert of Egypt. The granites occure as isolated plutons of high relief circular and semicircular outlines. They are cut by zoned pegmatites and dikes of different types. The pegmatites are found as lenticular pockets and sheet-like bodies along the southern periphery of Ras Baroud pluton. The zonal sequence of the pegmatites is formed of an outer blocky feldspar zone. The intermediate mica zone (muscovite and/or biotite) and an inner zone of massive quartz might present in some pockets and absent in others. In some pegmatite pockets, the intermediate zone of mica occurs with some distinct dark alteration parts that record the highest radioactivity levels. The geochemical studies revealed that these pegmatites are attributed to low temperature late differentiated magmatic fluids enriched in volatiles.Field radiometric survey was used to evaluate the suitability of mineral resources at the different pegmatite zones to industrial use. The environmental radioactive parameters showed that the radioactivity of all four zones of the pegmatites is higher than the safety limit which indicate hazardous effects on human lives if used as indore building and/or ornamental stones. Also, the uranium migration rates and directions showed that uranium migrates from the radioactive altered zone which has the higher uranium content towards the other three pegmatite zones (outer, intermediate and inner zones).From a paragenetic point of view, zones in pegmatite are developed from the wall inward within a restricted pegmatitic stage. In the early stage, zoned pegmatites of simple mineralogy are produced. In the later stage, residual fluids rich in soda, silica, alumina and significant quantities of Nb, Ta, U, Th and F travel along fractures, react with the previously formed pegmatitic minerals forming new minerals of replacement origin.The zoned pegmatites host U-minerals (betafite and kasolite) as well as Nb-Ta mineral (columbite) as invisible disseminations in the intermediate alteration zone, that confines their formation in a temperature range between 300 and 500 o C. The hydrothermal activity and the alteration processes are responsible for the deposition of the uranium minerals.

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Section: Activity Concentration Index (Iγ)mentioning

confidence: 48%

“…al., 2005). The safety value for this index is ≤ 1 (El Galy et al, 2008;El Aassy et al, 2012;Harpy et al 2019b;Taha et al 2020). Tables 1, 2, 3 and 4 show the environmental radioactivity parameters for the studied pegmatite zones (outer, intermediate, altered and inner).…”

Section: Activity Concentration Index (Iγ)mentioning

confidence: 99%

Environmental radioactivity of pegmatites associating younger granite of Ras Baroud area, Central Eastern Desert, Egypt.

2020

The Egyptian Journal of Environmental Change

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“…These indices must be less than the average in order to keep the radiation hazard insignificant [ 33 , 34 , 35 ]. The radiation exposure due to radioactivity in construction materials must be limited to 1.5 mSv year −1 ( Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

Hazards of Radioactive Mineralization Associated with Pegmatites Used as Decorative and Building Material

et al. 2022

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The present study aimed to assess the radiological hazards associated with applying the investigated granite in the building materials and the infrastructures applications. The investigated granites are classified into four categories: El-Urf, barren, colourful and opaque. El Urf monzogranite intrudes metagabbro diorite complex with sharp contacts. Based on the activity concentrations, the environmental parameters such as absorbed dose rate (Dair), annual effective dose (AED), radium equivalent activity (Raeq), external (Hex) and internal (Hin) hazard indices were measured. The mineralized pegmatite is located in the southwestern foothill of the Gabal El Urf younger granite. It displays well-defined zonation of three zones: outer, middle and inner zones represented by potash feldspar, quartz and mica, respectively. The isorad map showed that El Urf monzogranite is barren (Up to 100 cps) surrounding an excavation of the studied pegmatite that exhibits moderate colorful mineralization (phase-I = 500–1500 cps) and anomalous opaque mineralization (phase-II = 1500–3500 cps) pegmatites. The obtained results of radionuclides activity concentrations illustrated that the Opaque granites have the highest values of 238U (561 ± 127 Bq kg−1), 232Th (4289 ± 891 Bq kg−1) and 40K (3002 ± 446 Bq kg−1) in the granites, which are higher than the recommended worldwide average. Many of the radiological hazard parameters were lesser than the international limits in the younger granites and barren pegmatites. All of these parameters were higher in the colorful and opaque mineralized pegmatites. The high activity and the elevated radiological hazard parameters in the mineralized pegmatites are revised to the presence of radioactive and radioelements bearing minerals, such as thorite, meta-autunite, kasolite, phurcalite, columbite, fergusonite, Xenotime and fluorapatite. Other instances of mineralization were also recorded as cassiterite, atacamite, galena, pyrite and iron oxide minerals. Thus, the granites with high radioactivity concentration cannot be applied in the different applications of building materials and ornamental stones.

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“…U-waste contains radionuclides such as U-238, Th-232, Ra-226, and k-40 that can pollute the environment. These radionuclides can spread and pollute the environment, including soil, surface water and groundwater (Yong-ming 2011; Harpy et al 2020;nygymanova et al 2021). The presence of radionuclides in U-waste poses potential health risks to people living near these sites.…”

Section: Environmental Impacts From U-wastesmentioning

confidence: 99%

Wyzwania i możliwości odzysku w gospodarce odpadami podczas procesów wydobycia i wzbogacania rud zawierających uran i tor – przegląd

Yıldız,

Tombal-Kara

2024

Gospodarka Surowcami Mineralnymi - Mineral Resources Management

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Podczas wydobycia surowców promieniotwórczych, pierwiastków ziem rzadkich i innych pierwiastków z rud zawierających uran i tor powstają różnego rodzaju odpady radioaktywne oraz niektóre odpady poprodukcyjne. Pozostałości po wydobyciu i przeróbce rud, czyli odpady i odpady poflotacyjne, stwarzają szereg problemów związanych z gospodarką odpadami. Ich nieporęczna struktura uniemożliwia składowanie pod ziemią, a długi okres półrozpadu radioaktywności powoduje różne problemy związane z ich długotrwałym składowaniem. W rzeczywistości wtórna obecność surowców promieniotwórczych wraz z innymi minerałami wymaga przestrzegania procedur dotyczących odpadów niebezpiecznych przy składowaniu odpadów zawierających surowce radioaktywne po odzyskaniu tych głównych minerałów. Być może w przyszłości możliwe będzie odzyskiwanie tych surowców radioaktywnych ze składowanych odpadów kopalnianych. Perspektywa braku równowagi w globalnej podaży i popycie na uran zwiększa znaczenie źródeł wtórnych przyczyniających się do globalnej podaży uranu. Rosnące znaczenie wtórnych źródeł surowców radioaktywnych sugeruje, że należy zwrócić większą uwagę na odzysk tych zasobów wraz z pierwotnymi minerałami niż w przeszłości. W literaturze światowej nie ma artykułu przeglądowego opisującego i omawiającego gospodarkę odpadami surowców promieniotwórczych w górnictwie i przetwórstwie minerałów wraz z możliwościami i przeszkodami w ich odzyskiwaniu. Biorąc pod uwagę ten brak w literaturze, w niniejszym opracowaniu wyjaśniono właściwości odpadów i odpadów poflotacyjnych powstałych w wyniku wydobycia i przeróbki rud surowców radioaktywnych, wspomniano o napotkanych trudnościach oraz przedstawiono propozycje rozwiązań, wykorzystując literaturę dotyczącą odzysku odpadów poflotacyjnych i gospodarki odpadami.

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Radiometric and environmental impacts of mill tailings at experimental plant processing unit, Allouga, Egypt

Cited by 10 publications

References 29 publications

Environmental radioactivity of pegmatites associating younger granite of Ras Baroud area, Central Eastern Desert, Egypt.

Environmental radioactivity of pegmatites associating younger granite of Ras Baroud area, Central Eastern Desert, Egypt.

Hazards of Radioactive Mineralization Associated with Pegmatites Used as Decorative and Building Material

Wyzwania i możliwości odzysku w gospodarce odpadami podczas procesów wydobycia i wzbogacania rud zawierających uran i tor – przegląd

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