INVESTIGATION OF THE POSSIBILITY OF SEPARATE BIO-LEACHING OF URANIUM AND VANADIUM FROM BLACK SHALE RAW MATERIALS
ҚАРА ТАҚТАТАС ШИКІЗАТЫНАН УРАН МЕН ВАНАДИЙДІ БӨЛЕК БИОШАЙМАЛАУ МҮМКІНДІГІН ЗЕРТТЕУ
ИССЛЕДОВАНИЕ ВОЗМОЖНОСТИ РАЗДЕЛЬНОГО БИО-ВЫЩЕЛАЧИВАНИЯ УРАНА И ВАНАДИЯ ИЗ ЧЕРНОСЛАНЦЕВОГО СЫРЬЯ
Bulenbayev M.Zh. Altaibayev B.T. Magomedov D.R. Omirgali A.K. Bakrayeva A.N.
2025National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2025#2025Issue 676 - 91 pp.
This study presents the results of experiments aimed at developing an effective method for the selective leaching of uranium and vanadium from black-shale mineralization. The relevance of the research is associated with the complex mineral composition of black-shale deposits, the presence of organic matter, and the low solubility of uranium-and vanadium-bearing phases, which limit the efficiency of conventional in-situ leaching technologies. The study evaluates an improved well-based bioleaching approach that combines preliminary bio-oxidation by Acidithiobacillus Ferrooxidans with the use of perforated pipes equipped with heating and aeration systems to maintain optimal reaction conditions during the winter period. A series of experiments was conducted to assess the influence of temperature, sulfuric acid concentration, and biological oxidation on metal dissolution. The maintenance of elevated temperatures within the perforated pipes promoted the activation of oxidation processes in the deeper zones of black-shale deposits. Experimental findings demonstrated that achieving 96% uranium recovery in the productive solution requires maintaining a temperature of 20 °C and a sulfuric acid concentration of 2.5% following preliminary bio-treatment of the ore. Subsequent vanadium leaching was performed using 10% sulfuric acid at 30 °C, resulting in a recovery rate of 83.6%. The results confirm the high efficiency of the combined bio-oxidation and thermal-aeration approach, indicating its potential for year-round application in In-Situ processing of black-shale deposits. The proposed technology enhances both the selectivity and overall recovery of uranium and vanadium compared to baseline methods, thereby offering promising prospects for industrial implementation and improved resource utilization.
black shale ore , extraction , hydrometallurgy , leaching , oxidation processes
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Laboratory of Rare Scattered Elements, JSC Institute of Metallurgy and Ore Beneficiation, Satbayev University, Almaty, Kazakhstan
NAC Kazatomprom JSC, Astana, Kazakhstan
Laboratory of Special Methods of Hydrometallurgy, JSC Institute of Metallurgy and Ore Beneficiation, Satbayev University, Almaty, Kazakhstan
Laboratory of Rare Scattered Elements
NAC Kazatomprom JSC
Laboratory of Special Methods of Hydrometallurgy
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