Rehabilitation of the Barzava Uranium Mine Tailings

Florea, Nelida; Duliu, Octavian G.

doi:10.1061/(asce)hz.2153-5515.0000172

Cited by 6 publications

(3 citation statements)

References 7 publications

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“…Wang et al [11] evaluated the impact of various factors, including sand aggregate content, thickness of double cover layer, and water content of mortar cover layer, on radon exhalation from a concrete block covered with mortar and acrylic render. Florea and Duliu [12] used the cover method for the remediation of uranium tailings, and the results showed that the cover method was very effective in protecting against γ-rays. Waugh and Benson [13] found that the mulching effect would not be affected by the changes in soil hydraulic properties, plant species, and structure after several mulching sessions with loess mulching and direct water mulching being the most commonly used techniques.…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Optimal Control of Radon Exhalation in Uranium Tailings under Double-Layer Coverage

Zhang

Jian-yong

2023

International Journal of Energy Research

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The use of covering material is an important measure to control the radon migration of uranium tailings. Radon diffusion and migration are affected by cover layer parameters, such as diffusion coefficient, overburden thickness, particle size, and ore body width. The radon reduction effect of single-layer mulching is often less than that of double-layer, and the material parameters of the cover layer are uncertain; however, they can be explained by a fuzzy dynamic equation. Firstly, the radon exhalation model is constructed with the radon percolation diffusion and migration method in a double-layer covering. Secondly, a fuzzy target of radon exhalation and a fuzzy constraint model are constructed subject to the total cost and thickness of covering material by a triangular membership function. Lastly, the models are aimed at solving the corresponding extreme value interval of the fuzzy target of radon exhalation by immune genetic algorithm, to reconstruct the fuzzy target, fuzzy constraint, and fuzzy aggregation function, where, ultimately, the optimal radon control decision can be obtained by swarm intelligence algorithm subject to different levels between possibility and importance. An example demonstrates a database of optimal decision-making schemes for double-layer coverage, and flexible management of radioactive pollutants is realized.

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Section: Introductionmentioning

confidence: 99%

Fuzzy Optimal Control of Radon Exhalation in Uranium Tailings under Double-Layer Coverage

Zhang

Jian-yong

2023

International Journal of Energy Research

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“…Uranium mining practices usually result in an increase in radionuclide concentrations in the environment, which can lead to increased radiation exposure for the population [1]. Compared to radioactive waste from nuclear power plants, waste from uranium mining activities is characterized by a significantly lower level of radioactivity, but in the case of large volumes of naturally radioactive waste, an increase in the risk of radiation exposure for the local population can occur [2]. This type of waste is generally described as a mixture of host rocks and mineralized rocks that are uneconomic [2,3].…”

Section: Introductionmentioning

confidence: 99%

Natural Radioactivity in Soil and Radiological Risk Assessment in Lișava Uranium Mining Sector, Banat Mountains, Romania

Ion

Cosac²,

Ene³

2022

Applied Sciences

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The specific activity and spatial distribution of 238U, 232Th and 40K were determined in the surface soil from the Lișava uranium mining sector. This sector belongs to the Banat district, an historically important uranium mining area in Romania (an area with closed uranium mines and a radioactive waste dump). Gamma-ray spectrometry using a high-purity germanium (HPGe) detector was used to measure the activity of naturally occurring radionuclides in the soil. The average specific activities of 238U, 232Th and 40K in the soil were 197.21 Bq/kg for 238U, 16.21 Bq/kg for 232Th and 543.21 Bq/kg for 40K. The mineral contents of selected waste rock samples (sandstones) were examined using a scanning electron microscope (SEM), which revealed that brannerite, pitchblende and coffinite were the most important uranium-bearing minerals. The means of the radiological hazard parameters were calculated to be 262.22 Bq/kg radium equivalent activity (Raeq), 123.72 nGy/h absorbed gamma dose rates (DR), 0.7 external hazard index (Hex) and 1.8 representative level index (RLI). The spatial distribution of the risk assessment indices associated with the investigated soils exceeded the median values provided by UNSCEAR and reflected the geological settings and influences of anthropic activities such as uranium mining practices and the tipping of radioactive mining waste.

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“…Uranium (U) is an important trace element and a contaminant representing a signicant environmental hazard aer the mining and ore reprocessing activities. [1][2][3] U-containing natural systems, e.g. ore bodies and former mining sites, are oen considered as natural analogues for investigations of potential radionuclide release and retardation processes expected in a real spent nuclear fuel (SNF) repository.…”

Section: Introductionmentioning

confidence: 99%

A multi-technique study of altered granitic rock from the Krunkelbach Valley uranium deposit, Southern Germany

et al. 2020

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Rehabilitation of the Barzava Uranium Mine Tailings

Cited by 6 publications

References 7 publications

Fuzzy Optimal Control of Radon Exhalation in Uranium Tailings under Double-Layer Coverage

Fuzzy Optimal Control of Radon Exhalation in Uranium Tailings under Double-Layer Coverage

Natural Radioactivity in Soil and Radiological Risk Assessment in Lișava Uranium Mining Sector, Banat Mountains, Romania

A multi-technique study of altered granitic rock from the Krunkelbach Valley uranium deposit, Southern Germany

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