The features occurring during borehole uranium mining in deposits with low filtration characteristics, as well as the conditions and reasons for the reduction of geotechnological parameters of uranium mining by the well are considered in this study. Core material samples were taken from the productive horizon of the Chu-Sarysui province deposit and granulometric compositions were established. The contents of uranium, aluminum, calcium, magnesium, iron and carbonate minerals in the samples were determined by atomic emission spectroscopy. The X-ray phase analysis method established the features and quantitative and qualitative characteristics of ore-containing minerals. A special technique has been developed for conducting experiments in laboratory conditions using core samples, where the intensity of uranium leaching in tubes is determined. The results of laboratory studies are analyzed and discussed and graphs are constructed, to show the dependencies of change in: the filtration coefficients of K_f; the uranium content in solution; the extraction coefficient; and the specific consumption of sulfuric acid on the values of L:S (the ratio of liquid to solid) in the experiments. The effectiveness of using a mild acidity regime, with the addition of oxygen as an oxidizer, is determined and shown. The values of the uranium content in the productive solution, with the addition of oxygen as an oxidizer, reached 220 mg/L, which exceeds the design parameters. The results of uranium extraction from ore show a positive trend, reaching 68%, with L:S from 1.7 to 3.0, low acidity values and the addition of oxygen as an oxidizer. The specific consumption of sulfuric acid reaches the minimum values when using leaching solutions with reduced acidity of 26 kg/kg. The obtained results, on the flow rate of the solution in the tube, the extraction of uranium from ore and the specific consumption of sulfuric acid, indicate a decrease in sedimentation in a porous medium and increased filtration characteristics, with reduced acidity values in the leaching solution.

Influence of chemical reagent complex on intensification of uranium well extraction

The object of research is the technology of borehole uranium production with a low filtration characteristics. The purpose of the work is to increase the efficiency of borehole uranium production in complex mining and geological conditions by developing a new method based on the intensification of geotechnological processes of underground leaching of uranium, the impact of chemical reagents on the aggregate of sedimentation and mineralogical composition of ore-containing rocks of the productive horizon. At the same time, operating costs are reduced by increasing the productivity of the period of uninterrupted operation of geotechnical wells, as well as reducing the time spent working out technological blocks. Research methods include x-ray phase analysis, identification and discussion of the features, quantitative and qualitative parameters of core material and sedimentation from uranium deposits associated with the Syrdarya depression. Under laboratory conditions, the efficiency of the selected composition for the dissolution of sedimentary formations that reduce the permeability of layers was established by electron microdifraction. The applied hydrodynamic methods of well regeneration based on destruction and dispersion of sedimentation are considered and evaluated. The reagent methods used to increase the permeability of the productive horizon based on precipitation dissolution were also studied and evaluated. The results of experimental studies are analyzed and discussed, and a comparative schedule of the period of uninterrupted operation of wells is constructed. The effectiveness of the applied method for restoring the permeability of the productive horizon with the use of a complex chemical reagents. The scientific novelty lies in the fact that mineralogical studies of the core material composition indicate a complex structure of ores, in complex mining and geological conditions. The practical significance of the study lies in the high efficiency and applicability of the considered method of intensifying borehole uranium production in areas with low filtration characteristics.