Influence of chemical reagent complex on intensification of uranium well extraction

Abstract

Purpose. To determine the effect of special chemical reagents in the composition of leaching solutions on geotechnological parameters during uranium well extraction. To study the possibility of applying this method to increase efficiency of well extraction of uranium ores by intensifying ecotechnological processes of underground uranium leaching. To ensure design capacity of pro ducing blocks and the completeness of extracting metal from them, reduce and prevent sediment in porous medium, reduce spe cific consumption of sulfuric acid, electric power, labor and other production costs in the process of uranium well extraction. methodology. The research includes consistent literature review, laboratory and practical studies in real conditions. The sam ples studied in the laboratory by Xray phase analysis of mineralogical characteristics of sedimentation were taken from Syrdarya depression. Chemical reagents were selected and tested in geotechnological wells during experimental extraction of uranium. The resulting geotechnological parameters of wells were compared to experimental data. findings. Values of рН parameters of leaching solutions were obtained within the range from 6.5 to 2.3; it was established that Еh values initially tend to increase sharply to 300-380 mV and then to decrease to 170 mV; uranium content in productive solution was consistently growing from 29 to 146 mg/l; the values of iron salts (Fe 3+ , Fe 2+) concentration in the productive solution were determined in the case when they were affected by chemical multifunctional reagents. originality. The method for intensification of uranium well extraction has been developed and justified. It is based on a new complex of chemical reagents producing a selective effect on uraniferous minerals, which improves performance of producing blocks. Practical value. Rationally selected oxidizer and chemical reagents, as well as the scheme of their feeding into the productive horizon allow intensifying solution of fourvalent uranium in complex mining and geological conditions by underground leaching and improving performance of the producing block.

Study of hydroerosion process parameters of zeolite-smectite tuffs and underlying rock

“…Continuous extraction of chambers followed by collapse is rational [18,19]. In the process of excavation, an unloading zone is formed in the roof of the chambers, which perceives only the mass of the roof directly, the pressure of which is mainly transmitted to adjacent massifs and collapsed rocks of the produced space [19][20][21]. Using this solution, it is possible to reduce the pressure of the roof on the security cells by up to 10%.…”

Selecting the rational parameters for restoring filtration characteristics of ores during borehole mining of uranium depositst

“…One of the main reasons for the decrease in the throughput ability of technological boreholes is an increase in hydraulic resistance and a decrease in the filtration characteristics of the seam due to the formation of colmatation. The latter is caused by settling-out of substances dissolved in technological solutions, or mechanical displacement of particles in the orebearing horizon, as well as gas release [9], [10]. Hardly soluble sediments and displaced clay particles in the productive horizon increase the hydraulic resistance and form impermeable areas of geochemical barriers that block the flow lines of solutions.…”

The Influence of the Physicochemical Characteristics of Ores on the Efficiency of Underground Well Leaching of Uranium Deposits in Kazakhstan

“…In situ leach uranium mining [3,4] is the most economically viable and environmentally friendly method, especially when dealing with deep deposits below 300 meters and low ore grades below 0.1%-0.2%. This technology is highly efficient and involves lower capital and operational costs during the deposit development process.…”