In situ leaching (ISL) is an attractive technique that enables copper recovery from copper oxide ores that are either low-grade or located at depths too great to be economically exploited through conventional methods. At present, in situ leaching (ISL) has been applied to intact copper oxide ores, in particular, those which (i) present a good …Web
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The low-permeability characteristic of sandstone-type uranium deposits has become the key geological bottleneck during the in-situ leaching mining, seriously restricting the development and utilization of uranium resources in China. At present, the blasting-enhanced permeabilityWeb
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Leach tests conducted on freshly blasted rock from Diavik indicate the mass of N released corresponds to a 5.4% N loss from the blasting explosives; this mass is in the range for N loss reported ...Web
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Stope bioleaching and underground in situ uranium leaching are illustrated with examples in Chapter 6, Bioleaching of Copper and Uranium. ... Newer methods of fracturing the rocks through blasting would facilitate lixiviant permeation through the ore body. The following procedural aspects for ISL need to be considered for process optimization.Web
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A generalized scheme for in situ leaching of uranium with biologically generated ferric iron and acid, and excess iron and sulfate removal through jarosite …Web
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Description. 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. This publication provides an historical ...Web
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The proposed method on in-situ leaching of ore blocks with pretreatment by the divided injection- and - blasting is applicable in the additional extraction of ore from …Web
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In Situ Mining Research Proceedings: Bureau of Mines Technology Transfer Seminar, Denver, Colo., August 5, 1981 Compiled by Staff-Bureau of Mines UNITED STATES DEPARTMENT OF THE INTERIOR James G. Watt, Secretary BUREAU OF MINES . This publication has been cataloged as follows:Web
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Reformability evaluation of blasting-enhanced permeability in in situ leaching mining of low-permeability sandstone-type uranium deposits - ScienceDirect. Volume 55, Issue 8, August 2023, Pages 2773-2784.Web
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Uranium (U) contamination in groundwater of the uranium mines exploited using the in situ leaching (ISL) technology (also referred to as the ISL uranium mines) has attracted wide international attention. Since the adsorption of U in groundwater by aquifer media influences the migration scope of U, understanding the U adsorption by aquifer …Web
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It is essential to evaluate the blasting-enhanced permeability (BEP) feasibility of a low-permeability sandstone-type uranium deposit. In this work, the mineral composition, reservoir physical properties and rock mechanical properties of samples from sandstone-type uranium deposits were first measured. Then, the reformability evaluation method …Web
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situ leaching works by adding acid or alkali plus an oxidizer to groundwater and injecting it into the uranium ore, where it circulates, dissolving the uranium. The solution containing the dissolved uranium is then pumped to the surface for further processing. Both of these mining methods produce a liquid with uranium dissolved in it.Web
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With the characteristics of low pollution and high efficiency, CO 2 + O 2 in situ leaching has been applied to low-grade, low-permeability, high-carbonate, and high-salinity uranium deposits and …Web
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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 …Web
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In situ uranium leaching is gaining vast acceptance. However, uranium leaching from ore on a large scale is widely practiced in the USA, South Africa, Canada and India. Insoluble tetravalent uranium is oxidized with a hot H 2 SO 4 /Fe 3+ solution to make soluble hexavalent uranium sulfate at pH 1.5-3.5 and temperature 35°C (Crueger and Crueger ...Web
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the different methods of in situ leaching uranium production, its effect on the environment, groundwater restoration and related regulations were presented. Contributions from Bulgaria, China, ... In situ leach mining is defined in one of the paper presented as a "mining method where the ore mineral is preferentially leached from the host rock ...Web
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In general leaching techniques are two – Percolation leaching – a solution infiltrate through a fixed mineral location, and agitation leaching - mineral bearing ore stirred by a solution but while working in large scale, percolation leaching is usually chosen . The principal commercial methods are aerated stirred-tanks, in situ, dump, heap ...Web
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Introduction to uranium in situ recovery technology. Mark S. Pelizza, Craig S. Bartels, in Uranium for Nuclear Power, 2016 7.1.3.3 Eastern Europe. In Bulgaria, in situ leaching (ISL) using sulfuric acid chemistry was used in many locations. Nedyalkov (1996) reported the first ISR activity at the Sclishte in 1961. From 1981, ISL of broken hard rock was also …Web
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In situ leaching (ISL), also known as solution mining, or in situ recovery (ISR) in North America, involves leaving the uranium ore in the ground, and recovering the uranium by dissolving it from the uranium-bearing minerals by injecting carbonated solution or mild acid and pumping the leached uranium in a pregnant solution to the surface where ...Web
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Column leaching test was carried out for uranium ore samples obtained from a uranium in-situ leaching (ISL) mining site using 2.45 bed volumes (BVs) of 0.255 M sulphuric acid to study the evolution of uranium concentration and its isotopic 234 U/ 238 U activity ratio in the pregnant leach solution. The activity ratio of the two uranium …Web
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Acidic In-Situ Leaching of Uranium –Kazakhstan Kazatomprom is the world's largest producer of uranium, representing approximately 22% of total global uranium primary production in 2018. The Group benefits from the largest reserve base in the industry. Kazatomprom operates, through its subsidiaries, joint ventures and associates, 26 depositsWeb
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@article{osti_5170519, title = {In-situ uranium mining with oxygen}, author = {Litz, L M}, abstractNote = {Gaseous oxygen was dissolved in the leach liquor at concentrations of the order of 300 ppm. This oxygen-containing solution was injected into portions of a field being operated on a commercial basis with hydrogen peroxide as the oxidant.Web
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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 ...Web
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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 …Web
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In situ leach mining has numerous advantages as it is a relatively simple process and is low-cost and environment-friendly. It is an approach that is widely used to extract or recover low-grade ore bodies, such as uranium, copper, gold, and ion-adsorbed rare earth minerals that are difficult to recover using conventional mining methods [ 1 ].Web
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The greater rocks are cracked via blasting in the pit and are carried as big fragments to dumps. These dumps incorporate run-of-mine ore in million tons. ... Haque N, Nargate T (2013) The greenhouse gas footprint of in-situ leaching of uranium, gold and copper in Australia. J Clean Prod 84:382–390. CrossRef Google ScholarWeb
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CO2 + O2in situ leaching has been extensively applied in uranium recovery in sandstone-type uranium deposits of China. The geochemical processes impact and constrain the leaching reaction and leaching solution migration; thus, it is necessary to study the CO2 + O2–water–rock geochemical reaction process and its influence on the …Web
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A short description of the in situ leaching/in situ recovery (ISL/ISR) uranium mining technique and other uranium mining techniques are included for completeness, even though, based on current …Web
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In order to meet heavy demand of uranium resources due to rapid development of nuclear power in China and solve the problem of low permeability of the ores in in-situ leach uranium mining from low ...Web
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In the process of the in situ leaching of sandstone-type uranium deposit, in order to reduce the cost of acid and improve the efficiency of uranium leaching, it is necessary to use oxidants to directly or indirectly oxidize U(IV) in the ore to U(VI) [1,2,3,4].At the same time, other minerals in the ore, such as pyrite, mica, chlorite, organic matter, …Web
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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 ... In situ and in place leaching Ill 5.8.1. Introduction Ill 5.8.2. In situ leaching 113 5.8.3. In place leaching 119 5.9. Heap and vat leaching 121 5.9.1. Introduction 121Web
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