— In situ recovery (ISR) 2 uranium mining technology was developed independently in both the USSR and in the USA in the late 1950s to early 1960s. It was developed in both countries using similar engineering and technological approaches. However, the Soviets adopted the acid leach system, while the US specialists employed …
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— Uranium processing - Leaching, Extraction, Purification: Roasted uranium ores are leached of their uranium values by both acidic and alkaline aqueous solutions. For the successful operation of all leaching systems, uranium must either be initially present in the more stable hexavalent state or be oxidized to that state in the leaching process. …
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Nuclear Engineering and Technology (Aug 2023) . Reformability evaluation of blasting-enhanced permeability in in situ leaching mining of low-permeability sandstone-type uranium deposits
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Over the last several decades in-situ leach mining has become increasingly popular. Conventional mining produces tailings, runo!, and considerable land disturbance—all requiring signi"cant rehabilitation. ... uranium, copper, gold and silver. Extraction can be accomplished using one of two methods; the well-to-well recovery method discussed ...
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— 3D reactive transport model is an efficient tool to simulate uranium ISR operation: indeed the whole process is based on reacting fluid circulation in porous media. The simulation can help quantify the processes at …
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— The metal can be recovered from it in a concentrated form after leaching. A lixiviant solution may be acidic or basic in nature. If calcium is present in ore-body, carbonate alkaline leaching is often preferred, otherwise acid is mostly used. In-situ leaching generally involves extraction of minerals or metals from the undisturbed ore in …
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— In-place leaching is similar to in situ leaching but the ore body is fractured by blasting to improve the permeability before the leaching (Wadden and Gallant, 1985). A scheme of possible contributions of microorganisms in uranium solubilization in the indirect in situ leaching with the two-stage approach is shown in Fig. 5 .
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In some circumstances, ore may be mined by in situ recovery, a process that dissolves the uranium while still underground and then pumps a uranium-bearing solution to the surface. Open pit mining. When uranium ore is found near the surface, generally less than 100 metres deep, it is typically extracted by open pit mining.
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In order to obtain a desirable muck-pile formation by stope blasting for in-situ leaching and more uniform leaching rate of uranium from flat-dipping ore bodies,some commercial tests were carried out on the in-situ leaching of uranium after stope blasting in a mine by using the following methods and technologies,including muck-pile formation by upward deep …
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— This study contributes to the understanding of the behavior of pyrite during uranium recovery through CO 2 + O 2 leaching. It also contributes to the understanding …
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the processing of new objects by the method of in situ leaching. The presence of chloride ions suppresses the uranium recovery by anion exchangers [12-14]. The process of uranium sorption by ion exchange resin is the basis of a large amount of technological schemes for reprocessing productive solutions [15 -19]. Therefore, in
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The cover picture shows the in situ uranium central processing facility, Hobson Uranium Project, Everest Mineral Corporation, Karnes County, Texas, United States of America.
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— This study offers valuable insights into the sustainable advancement of in situ leaching technologies in uranium mining, propelling scientific research and practical applications in the...
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— In the process of in situ leaching of uranium, the microstructure controls and influences the flow distribution, percolation characteristics, and reaction mechanism of lixivium in the pores of ...
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— With to day's soft uranium market and the mining of high-grade open-pit deposits, a new technology to reduce the operating cost to recover relatively low-grade underground reserves of uranium was ...
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— In this study, an electrokinetic in situ leaching method for low-permeability uranium ore is proposed. Compared to traditional in situ leaching methods, this process …
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— Usually, an in-situ leaching mining area consists of dozens of in-situ leaching units, and each unit consists of five or seven wells, a production well in the center and several surrounding injection wells, forming a "five-spot" or "seven-spot" pattern well field.
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— Conference: Remediation of uranium in-situ leaching area at Straz Pod Ralskem, Czech Republic ... Over the period of 'chemical' leaching of uranium (ca. 32 years), a total of more than 4 million tons of sulphuric acid and other chemicals have been injected into the ground. Most of the products (approx. 99.5 %) of the acids reactions …
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— CO2 + O2 in-situ leaching (ISL) of sandstone-type uranium ore represents the third generation of solution mining in China. In this study, reactive transport modeling of the interaction between hydrodynamic and geochemical reactions is performed to enable better prediction and regulation of the CO2 + O2 in-situ leaching process of uranium. …
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First used in Wyoming in the 1950s, in-situ leaching (ISL) mining accounts for most uranium production in the United States. In situ leaching – what it is. ISL involves injecting chemicals, called "lixivants" into an aquifer that contains a uranium ore body (i.e. deposit).
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In situ leach or leaching (ISL) or in situ recovery (ISR) mining has become one of the standard uranium production methods. Its application to amenable uranium deposits (in certain sedimentary formations) has been growing in view of its competitive production costs and low surface impacts.
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DOI: 10.1016/j.2023.03.034 Corpus ID: 258287254; Reformability evaluation of blasting-enhanced permeability in in situ leaching mining of low-permeability sandstone-type uranium deposits
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— Since the 1990s, sandstone-type uranium in the northern basin of China has become the main target for mining. Uranium mining can cause a series of impacts on the environment. A conceptual model of the geo-environment for sandstone-type uranium in northern China was described, which covers the changes in the geo-environmental …
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— Placer mining is useful when minerals from aquatic sediments are exploited, while in situ leaching (ISL) is mainly used for the Sustainability 2022, 14, 12469 3 of 12 recovery of uranium [27, 28 ...
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— The permeability of ore is a key factor affecting the leaching effect of uranium ore, and the addition of surfactants can significantly improve the permeability of ore, thereby strengthening uranium ore leaching. This article simulates two infiltration leaching processes, atmospheric heap leaching and pressurized in-situ leaching, and …
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— In-situ uranium leaching with the help of bacteria was carried out in the Standrock Ltd. uranium mine in Elliot Lake, Ontario, Canada even before 1965 [10,11]. ... Through drilling and blasting techniques, the fractured ore block was leached in combination with an on-site bioreactor for Fe 3+ regeneration. Although principal feasibility was ...
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— In situ bioleaching can be used to extract metals such as uranium and copper. In the 1960s, Canada was the first to pour acidic mine water containing iron and sulfur-oxidizing bacteria over the unmined ores in the stope, and inject bacteria-containing acidic mine water in situ into the mined underground uranium deposit, which achieved a good …
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Chapter 2 provides information on uranium recovery using the in-situ leach (ISL) process. The first part of the chapter gives basic information on the type of uranium deposits that …
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The remediation of groundwater subject to in situ leaching (ISL) for uranium mining has raised extensive concerns in uranium mill and milling. This study conducted bioremediation through biostimulation and bioaugmentation to the groundwater in an area in northern China that was contaminated due to uranium mining using the CO2 + O2 neutral ISL ...
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— The varied in situ leaching methods tailored to the primary composition of uranium deposits worldwide underscore the remarkable achievements of in situ leaching in improving extraction efficiency, …
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— Previous conclusions regarding ultrasonic leaching may therefore not be applicable to the in situ leaching of low-permeability uranium-bearing sandstone. Although low-frequency vibration has been widely applied in the oil industry to increase oil permeability (Sun et al., 2020), its use in uranium leaching has only been reported by …
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— 1. Introduction. Uranium (U) is a crucial mineral resource that serves as the foundation of nuclear industry development and plays an indispensable role for nuclear power generation and medical applications [1].In situ leaching uranium mining technology is extensively used in the uranium mining process due to its distinctive advantages of …
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The remediation of groundwater subject to in situ leaching (ISL) for uranium mining has raised extensive concerns in uranium mill and milling. This study conducted bioremediation through biostimulation and bioaugmentation to the groundwater in an area in northern China that was contaminated due to u …
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