Kinetics of Leaching Process Using Sulfuric Acid for Sella Uranium Ore Material, South Eastern Desert, Egypt

Khawassek, Yasser; Taha, Mohamed; Eliwa, Ahmed A.

doi:10.14355/ijnese.2016.06.006

Cited by 28 publications

(9 citation statements)

References 9 publications

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“…It is well soluble in water, the solubility in water is significantly reduced in the presence of 70 % sulfuric acid. At a temperature of 260 °C, it completely decomposes into nitrogen, water and sulfur dioxide, and is non-toxic [6,7].…”

Section: Selection Of Chemical Reagents For the Intensification Of Borehole Uranium Productionmentioning

confidence: 99%

Increasing of filtration characteristics of ore bodies in borehole uranium mining

et al. 2020

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There is a description of technology by borehole uranium mining in Kazakhstan. The factors which affect for reduction of filtration characteristics in productive reservoirs are studied in detail and described an effective method for increasing borehole uranium production. The processes that occur during borehole mining of uranium with the use of sulfuric acid as solvent, as well as the conditions and reasons for reducing the productivity of geotechnical wells during their operation are considered. The results of experimental work on the intensification of borehole uranium mining in complex mining and geological conditions are analyzed and discussed, comparative graphs of the content of uranium in the productive solution, the flow rate of wells, the degree of extraction and the volume of production before and after the experiments are constructed. The results of experimental work on the efficiency of borehole uranium production, the content of uranium in PS and the productivity of wells, with predominance of the chemical type of sedimentation, are positively evaluated. The optimal parameters for the intensification of borehole uranium production in complex mining and geological conditions are recommended, and method for using complex of multi-purpose chemical reagents in combination with traditional methods of well regeneration is developed.

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Section: Selection Of Chemical Reagents For the Intensification Of Borehole Uranium Productionmentioning

confidence: 99%

Increasing of filtration characteristics of ore bodies in borehole uranium mining

et al. 2020

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“…Uranium is the most representative element of the actinide series and is of fundamental importance in the nuclear fuel cycle. It is expected that the nuclear energy market will grow substantially over the next 20 years, for example, in the United States alone, according to forecasts, by 2030 it will grow by 50%, and global electrical energy consumption, according to the Ministry of Energy, will double by 2030 [1]. Intergovernmental Panel on Climate Change (IPCC) stresses the urgent need to use all available low-carbon technologies to prevent climate change.…”

Section: Introductionmentioning

confidence: 99%

Methods for intensification of borehole uranium mining at the fields with low filtration characteristics of ores

Kenzhetaev¹,

Nurbekova²,

Togizov³

et al. 2021

Min. miner. depos.

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Purpose. Improving the efficiency of borehole uranium mining and the selection of special decolmating solutions to improve the filtration characteristics of the seam due to effective destruction, as well as by preventing the sedimentation in the productive horizon, depending on the mineralogical composition and structure of sediment-forming materials. Methods. The advantages and disadvantages of the main methods used for improving the filtration characteristics of the productive horizon, when mining the uranium deposits by the borehole method, have been studied. Samples of sedimentation from the productive horizon are taken at the uranium deposit of the Shu-Syrasu depression. The quantitative and qualitative parameters, as well as the peculiarities of the mineral compositions have been determined by the X-ray phase method. A methodology has been developed and laboratory experiments have been conducted on the treatment of sedimentation samples by the drop method using various compositions of selected decolmating solutions. The microscopic method is used to determine the structure and peculiarities of sedimentation before and after treatment with various decolmating solutions. Findings. The effectiveness of the main methods used to improve the filtration characteristics of seams in the uranium deposits, mined by the borehole method, has been determined. The structure and composition of sedimentation, which causes a decrease in the filtration characteristics of the productive horizon, have been determined. To destroy and prevent the sedimentation in the productive horizon, an effective composition of a special decolmating solution using ammonium hydrogen fluoride with the addition of sulphuric acid and surfactants has been selected. An effective method for increasing the filtration characteristics of the productive horizon with the use of special decolmating solutions has been developed and scientifically substantiated. Originality. The use of special decolmating solutions based on ammonium hydrogen fluoride with the addition of sulphuric acid and surfactants according to the developed methodology allows to effectively destroy and prevent sedimentation in the productive horizon of borehole uranium ore mining. Practical implications. The use of the developed decolmating solution and a special methodology for the intensification of borehole uranium mining can reduce the operating costs of its production. This increases the ecological and industrial safety of the work to intensify the leaching of uranium ores.

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“…As a result, the period of the technological blocks mining increases along with the consumption of sulfuric acid and other operating expenses. These blocks require frequent repair and restoration work, as well as an additional increase in the host rocks permeability [8]. In some cases, cost-intensive, heavy complex treatments using drilling rigs do not give a positive result [9].…”

Section: Introductionmentioning

confidence: 99%

Research into leaching of uranium from core samples in tubes using surfactants

Rakishev¹,

Матаев²,

Kenzhetaev³

et al. 2020

Min. miner. depos.

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Improving the efficiency of borehole uranium recovery in difficult mining-and-geological conditions through the development of a new technology based on the intensification of geotechnological processes of in-situ uranium leaching, the selective effect of a new chemical reagents complex on a set of the mineralogical and particle-size distribution of the orebearing rocks of the productive horizon. Methods. Sampling of core material from host rocks of the Syr Darya depression uranium deposit. The content of uranium, calcium, aluminum, iron, magnesium, and carbonate content in the samples has been revealed by the spectral analysis method. The quantitative and qualitative parameters and peculiarities of the host minerals have been determined by the method of X-ray phase analysis. By testing particle-size distribution, the fractional parameters of core samples have been determined. Specifications have been developed, as well as laboratory experiment have been conducted on uranium leaching from core material in a dynamic mode in tubes, with the addition of selected chemical reagents with different modes. Findings. The aspects of borehole uranium recovery using sulfuric acid solutions as a solvent and the reasons that cause a decrease in geotechnological parameters in ores with low filtration characteristics have been determined. An effective method has been developed for intensifying borehole uranium recovery using superficially active substance (surfactants, SAS) in difficult mining-and-geological conditions, with an increased content of argillaceous and carbonate minerals, and low filtration host rocks properties. An efficient and economically feasible method for uranium leaching with sulfuric acid solutions with the addition of surfactants has been revealed and scientifically substantiated. Originality. The scientific novelty is in the fact that the selected surfactants added to sulfuric acid solutions increases the uranium content in the productive solution and the degree of economically feasible uranium recovery with reduced sulfuric acid consumption and the ratio of liquid to solid (L:S). Practical implications. The use of rational surfactants in uranium leaching makes it possible, in areas with low filtration characteristics, to reduce operating expenses for production by reducing the period of recovery, to increase the uranium content in the productive solution and the degree of recovery, as well as to reduce the consumption of sulfuric acid and sedimentation.

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Kinetics of Leaching Process Using Sulfuric Acid for Sella Uranium Ore Material, South Eastern Desert, Egypt

Cited by 28 publications

References 9 publications

Increasing of filtration characteristics of ore bodies in borehole uranium mining

Increasing of filtration characteristics of ore bodies in borehole uranium mining

Methods for intensification of borehole uranium mining at the fields with low filtration characteristics of ores

Research into leaching of uranium from core samples in tubes using surfactants

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