Abstract
Purpose is to increase uranium content in a PR solution while developing a technique varying oxidation-reduction potential of a leach solution with its oxygenation and identify changes in the oxygenation depending upon sulfuric acid concentration as well as transportation distance of the solution. Methods. A laboratory facility, involving solution tank, pump, Venturi tube, tank to install oxygen analyzer, and a dump tank, has been manufactured under the lab conditions to determine a leach solution oxygenation taking into consideration its delivery rate, sulfuric acid concentration, and temporal preservation of the concentration. Solution flow velocity; the deli-vered solution volume; sulfuric acid concentration; and distance from oxygenation point to a seam changed and varied during the study. Oxygenation was measured with the help of AZ 8403 oximeter; IT-1101 device was used to measure pH value as well as oxidation-reduction potential (ORP). Findings. A technique for a leach solution oxygenation and results of laboratory tests to identify influence of a sulfuric acid as well as transportation distance of a solution on oxygen concentration in the solution have been represented. It has been determined that Venturi tube helps oxygenize a leach solution; in this context, maximum oxygen concentration is achieved if a flow velocity is optimum one. It has been specified that a solution oxygenating depends upon a sulfuric acid concentration decreasing moderately with the increasing distance of the solution transportation. Originality.Following new dependencies have been determined: oxygen concentration in a solution upon a flow velocity and solution volume; and oxygen concentration in a solution upon distance from concentration place and sulfuric acid concentration. Practical implications.A leach solution oxygenation results in the increased oxidation-reduction potential and in the increased content of a useful component in the pregnant solution respectively. The proposed technique is notable for its low capital spending. Moreover, it is integrated easily into the available system being absolutely environmentally friendly.
Highlights
Nuclear energetics, ranking No 4 in the world power balance after coal-fired power industry (40%), gas industry (21%), and hydraulic power industry, has become the most important factor influencing the situation of the global uranium market and its development tendencies [1]
Maximum oxygen concentration in a solution is achieved when 97 l/h solution volume is passing through a pipeline
The research has identified that use of Venturi pipe helps oxygenize a leach solution
Summary
Nuclear energetics, ranking No 4 in the world power balance after coal-fired power industry (40%), gas industry (21%), and hydraulic power industry (more than 16%), has become the most important factor influencing the situation of the global uranium market and its development tendencies [1]. Taking into consideration the global population growth and large-scale industry development, increase in energy demand becomes more rapid relative to earlier forecasts. In this context, experts expect that new energy sources will not be involved industrially and at competitive prices before 2030. Relatively cheap and available reserves of crude oil, gas, and coal will be mined, extracted, and produced from the Earth’s interior [2]-[5]. It goes without saying that issue of extraction of rare earth elements from technogenic deposits will be faced [6], [7]
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