Results 161 to 170 of about 2,358 (208)
Some of the next articles are maybe not open access.
Thermodynamic modeling of the in situ leaching of uranium
Journal of Radioanalytical and Nuclear Chemistry, 2014The thermodynamic model of uranium in situ leaching process at the stage of acidification was investigated. It was demonstrated that in the frontal zone of acid leaching solutions reduction of U(VI) up to U(IV) was possible due to the behavior of oxidation–reduction processes with the ferrous ions involved. At the same time uranium is precipitated as U(
A. M. Pastukhov +2 more
openaire +1 more source
Reactive transport model of uranium by CO2 + O2 in situ leaching
Environmental Science and Pollution Research, 2023Uranium is an important strategic resource, and its safe and efficient development and utilization are of great significance to ensuring a nation's energy supply and strategic security. Sandstone-type uranium ore is commonly mined by CO2 + O2 in situ leaching, for which understanding the coupling mechanism between the hydrodynamic and chemical fields ...
Haitao, Zhang, Tong, Zhang, Yupeng, He
openaire +2 more sources
Aquifer restoration at uranium in situ leach sites
International Journal of Mine Water, 1984In situ mining of uranium involves injection of a leaching solution (lixiviant) into an ore-bearing aquifer. Frequently, the ground water in the mined aquifer is a domestic or livestock water supply. As the lixiviant migrates through the ore body, uranium and various associated elements such as arsenic, selenium, molybdenum, vanadium and radium-226 are
Frank S. Anastasi, Roy E. Williams
openaire +1 more source
Acid Leach Of Uranium Ore: In Situ Conditions
SPE Annual Technical Conference and Exhibition, 1979Abstract Core samples from a property in Wyoming were tested for amenability to in situ leaching by acid ferric sulfate. In tests, about 95% recovery of the uranium was achieved. The ore is fortunately low in carbonate, and sulfuric acid consumption of 15#/T is expected using feed solutions of pH 1.8.
openaire +1 more source
Application of hydrogen peroxide to intensify in-situ leaching of uranium
Obogashchenie Rud, 2021The current goal in uranium mining is to ensure the maximum effect at minimized costs. One of the problems when using the in-situ leaching (ISL) technology consists in the incomplete mining of the process blocks due to premature uranium content reduction in the pregnant solutions, leading to increased mining times and excessive reagent consumption. The
Kh. A. Yusupov +3 more
openaire +1 more source
RECOVERY OF ASSOCIATED METALS DURING IN SITU LEACHING OF URANIUM
SGEM International Multidisciplinary Scientific GeoConference� EXPO Proceedings, 2022Uranium mining companies of Kazakhstan during 15 years increased production of uranium more than 15 times using in-situ recovery of uranium (ISR). At the same time a significant part of uranium deposits contains gold, silver, palladium and rare metals like rhenium, germanium, scandium and et`s. The task was set for the complex extraction of associated
Yerkin Bektay +4 more
openaire +1 more source
Uranium In Situ Leaching Sulfur Chemistry
Mining, Metallurgy & Exploration, 1985In situ leaching of uranium by aqueous ammonium carbonate containing oxygen or hydrogen peroxide as oxidant results in the partial dissolution of sulfides. While some of the sulfide sulfur is oxidized to sulfate, a considerable portion is oxidized only to thiosulfate and polythionates. Polythionates poison the ion exchange resin used to extract uranium.
openaire +1 more source
Acid Stimulation Used in In-Situ Leaching Uranium
18th International Conference on Nuclear Engineering: Volume 1, 2010Acidization was studied on a uranium sandstone deposit in Inner Mongolia with low–permeability and heavy calcium cementation. Acid dissolving test indicates that hydrochloric acid, formic acid and mud acid can easily dissolve formation minerals. With proper volumes and concentrations of acids used, the risk of precipitation of reaction products could ...
Wen-sheng Liao +5 more
openaire +1 more source
In-Situ Uranium Leach Mining: Considerations for Monitor well Systems
SPE Annual Technical Conference and Exhibition, 1980Abstract Monitor wells are placed around an in situ leach mine to alleviate the potential for groundwater degradation. Such monitoring systems are the result of regulatory requirements or theoretical hydrologic concepts, irrespective of geologic anisotropies.
D.L. Durler, A.L. Bishop
openaire +1 more source
Post In-Situ Uranium Leaching Site Restoration Numerical Analysis
All Days, 1979Abstract This paper presents the development of and results from a computer model of post in situ uranium leaching site restoration. This model uses a streamline-concentration balance approach and is useful with a wide range of reservoirs.
Robert Schechter, Paul Bommer
openaire +1 more source