Improving the technology of uranium mining under the conditions of high groundwater pressure

Ye.U., None Omarbekov; Yussupov, Khalidilla

doi:10.33271/mining14.03.112

Cited by 5 publications

(5 citation statements)

References 22 publications

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“…This method is the most cost-intensive due to the use of a large number of equipment, chemical reagents, maintenance personnel and a long duration of the works. However, these methods are ineffective in difficult mining-and-geological conditions, as multicomponent sedimentations are accumulated in the near-filter zone and form cemented impermeable areas that are not amenable to conventional stimulation methods [17], [18].…”

Section: Figure 3 Location Map Of Regions With Explored Uranium Deposits In Kazakhstanmentioning

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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Section: Figure 3 Location Map Of Regions With Explored Uranium Deposits In Kazakhstanmentioning

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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“…Recently, the scope of ISL technology embraces geologically unfavorable reservoirs, with low uranium content, low permeability, high clay content and without ferric iron in rock mass and in reservoir water [5][6][7]. As a consequence, the uranium recovery efficiency in production blocks is round 50% at the sulfuric acid content of 10-15 g/l in leach solutions for easy compounds and round 80% at the solution acidity of 20-25 g/l for difficult uranium.…”

Section: Introductionmentioning

confidence: 99%

Effect of process solution saturation with oxygen on uranium in-situ leaching performance

Toktaruly¹,

Bayeshov²,

Aben³

et al. 2022

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One of the effective methods of mining low-grade uranium deposits is the in-situ leaching technology. On the other hand, in difficult geological conditions, this technology fails to provide the desired effect and increases duration of mining, which, eventually, evaluates production costs.Feasibility of increasing uranium content in pregnant solution and reducing production period is governed by ferric iron concentration in process solution. For increasing the ferric iron concentration and, thus, the content of uranium in pregnant solution in uranium in-situ leaching, it is proposed to saturate the leach solution with atmospheric oxygen using the Venturi tube. The lab-scale tests of core materials for determining dependence of the uranium content in the pregnant solution on the oxygen concentration in the leach solution prove the advantages of the proposed technology of uranium in-situ leaching.According to many researchers, the uranium recovery in the pregnant solution in in-situ leaching depends on the degree of saturation of the leaching solutions with oxygen capable to oxidize ferrous iron (Fe 2 ) to ferric iron (Fe 3 ) and, thereby, to stimulate oxidizability of the leaching environment. The objective of the studies was to determine parameters of saturation of process solutions with oxygen.

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“…Analysis of different techniques intensifying leaching has shown that they accelerate the process and increase several times useful mineral extraction [28], [29]. Nevertheless, they are not versatile and depend upon conditions of specific deposits.…”

Section: Introductionmentioning

confidence: 99%

Analyzing changes in a leach solution oxygenation in the process of uranium ore borehole mining

Aben¹,

Toktaruly²,

Khairullayev³

et al. 2021

Min. miner. depos.

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Purpose is to increase uranium content in a PR solution while developing a technique varying oxidation-reduction potential of a leach solution with its oxygenation and identify changes in the oxygenation depending upon sulfuric acid concentration as well as transportation distance of the solution. Methods. A laboratory facility, involving solution tank, pump, Venturi tube, tank to install oxygen analyzer, and a dump tank, has been manufactured under the lab conditions to determine a leach solution oxygenation taking into consideration its delivery rate, sulfuric acid concentration, and temporal preservation of the concentration. Solution flow velocity; the deli-vered solution volume; sulfuric acid concentration; and distance from oxygenation point to a seam changed and varied during the study. Oxygenation was measured with the help of AZ 8403 oximeter; IT-1101 device was used to measure pH value as well as oxidation-reduction potential (ORP). Findings. A technique for a leach solution oxygenation and results of laboratory tests to identify influence of a sulfuric acid as well as transportation distance of a solution on oxygen concentration in the solution have been represented. It has been determined that Venturi tube helps oxygenize a leach solution; in this context, maximum oxygen concentration is achieved if a flow velocity is optimum one. It has been specified that a solution oxygenating depends upon a sulfuric acid concentration decreasing moderately with the increasing distance of the solution transportation. Originality.Following new dependencies have been determined: oxygen concentration in a solution upon a flow velocity and solution volume; and oxygen concentration in a solution upon distance from concentration place and sulfuric acid concentration. Practical implications.A leach solution oxygenation results in the increased oxidation-reduction potential and in the increased content of a useful component in the pregnant solution respectively. The proposed technique is notable for its low capital spending. Moreover, it is integrated easily into the available system being absolutely environmentally friendly.

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Improving the technology of uranium mining under the conditions of high groundwater pressure

Cited by 5 publications

References 22 publications

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

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

Effect of process solution saturation with oxygen on uranium in-situ leaching performance

Analyzing changes in a leach solution oxygenation in the process of uranium ore borehole mining

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