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Technology of Bacterial Oxidation of Iron in Underground Uranium Borehole Leaching
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| Author:
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GAUKHAR TURYSBEKOVA, AKMURAT ALTYNBEK, YERKIN BEKTAY, BAURZHAN SHIDERIN, MAXAT BEKTAYEV
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| Abstract:
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The aim of this scientific work is to study the process and optimal conditions for increasing the concentration of ferric iron and the redox potential (RP) of leaching solutions (LS) on bioreactors in a uranium mine. The studies used physicochemical, titrometric, microbiological and biotechnological methods for determining the physicochemical, biological and technological parameters of the installation. In the conditions of industrial production ISL of uranium, the possibility of using biotechnological methods to activate leaching solutions has been determined. The factors affecting the kinetics and dynamics of the oxidation of ferrous iron to a ferric state were studied: thermal conditions, ambient temperature, and oxidation rate. The redox potential of activated leaching solutions (ALS) reached 500 - 600 mV in the static mode, and in the flow mode it rose from 360 mV to 430 mV at a flow rate of over 0.9 m3 // hour through a bioreactor with a nominal volume of 1 m3. The experiments were carried out in winter (up to - 500?) and in summer conditions (up to + 350?). The solution temperature in the summer rose from 100? to 150?, in the winter it dropped to 100?.
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| Keyword:
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uranium, underground well leaching, in-situ leaching, leaching solution, activated leaching solution, iron, bacterial iron oxidation, bacteria, bioreactor, immobiliser, biomass
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| EOI:
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-
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| DOI:
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https://doi.org/10.31838/ijpr/2020.12.03.423
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| Download:
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