Permeability characteristics of sandstone-type uranium deposits under different temperature and confining pressure

Abstract

In-situ leaching is the main way to realize fluidization mining of deep uranium ore, which has the characteristics of safety, low pollution and low cost. However, deep uranium mining is under high temperature and high pressure, which greatly affect the permeability of uranium deposit. The sandstone-type uranium deposits were taken as the research object in this paper, and a multiphase and medium flow experimental simulation system were used for solution seepage experiment under the action of temperature and confining pressure. Based on the permeability data obtained during the experiment, Origin software was used to process the experimental data. The results indicated that the permeability of sandstone-type uranium ore increased with temperature increased and decreased with confining pressure increased. The influence of temperature on permeability was higher than that of confining pressure. According to the trend of permeability change under the action of temperature and pressure, the higher the temperature, the more significant the permeability change under different confining pressure. The lower the confining pressure, the more significant permeability change under different temperatures. The maximum permeability of sandstone-type uranium ore was obtained under temperature of 80 °C and confining pressure of 6.0 MPa.

Keywords

deep uranium mining / temperature / confining pressure / permeability

References

[1] IlankoonI M S K, TangY, GhorbaniY, et al. . The current state and future directions of percolation leaching in the Chinese mining industry: Challenges and opportunities [J]. Minerals Engineering, 2018, 125: 206-222

[2] PelizzaM S, BartelsC SIntroduction to uranium in situ recovery technology [M], 2016, Amsterdam, Elsevier: 157213

[3] SeredkinM, ZabolotskyA, JeffressG. In situ recovery, an alternative to conventional methods of mining: Exploration, resource estimation, environmental issues, project evaluation and economics [J]. Ore Geology Reviews, 2016, 79: 500-514

[4] FaganM A, SedermanA J, HarrisonS T L, et al. . Phase distribution identification in the column leaching of low grade ores using MRI [J]. Minerals Engineering, 2013, 48: 94-99

[5] RuckerD. Investigating motion blur and temporal aliasing from time-lapse electrical resistivity [J]. Journal of Applied Geophysics, 2014, 111: 1-13

[6] MiaoX-x, NarsilioG A, WuA-x, et al. . A 3D dual pore-system leaching model. Part 1: Study on fluid flow [J]. Hydrometallurgy, 2017, 167: 173-182

[7] KangZ-qin. Experimental study of effect of temperature on permeability characteristics of lignite [J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(8): 1585-1590(in Chinese)

[8] XU Zeng-hui, YE Yuan-xin, LIU Guang-ting, et al. Research on effect of temperature on permeability of soft rock [J]. Journal of China Three Gorges University (Natural Sciences), 2006(4): 301–304, 311. (in Chinese)

[9] PingZ. Experimental study concerning the effect of temperature, effective stress and water saturation on the permeability of tight sandstone [J]. Natural Gas Geoscience, 2005, 16(1): 31-34

[10] ChenW, YinS-h, SongQ, et al. . Enhanced copper recovery from low grade copper sulfide ores through bioleaching using residues produced by fermentation of agricultural wastes [J]. International Journal of Minerals, Metallurgy and Materials, 2022, 29(12): 2136-2143

[11] ChenW, YinS-h, IlankoonI M S K. Effects of forced aeration on community dynamics of free and attached bacteria in copper sulphide ore bioleaching [J]. International Journal of Minerals, Metallurgy and Materials, 2022, 29(1): 59-69

[12] LiX-y, WuQ, HongC-s, et al. . Experimental study on the gas permeability of uranium-bearing similar material under multi-factor effects [J]. Journal of University of South China (Science and Technology), 2018, 32(2): 55-61(in Chinese)

[13] LiK, YangD-s, ChenW-z, et al. . Study on permeability evolution of tight coal under different stress and pore pressure conditions [J]. Journal of Taiyuan University of Technology, 2019, 50(3): 265-271(in Chinese)

[14] ZhaoY-x, CaoB, ZhangTong. Experimental study on influences of permeability of axial pressures and penetrative pressures on broken rocks [J]. Journal of Mining Science and Technology, 2018, 3(5): 434-441(in Chinese)

[15] FuH-y, JiangH-b, QiuX, et al. . Seepage characteristics of a fractured silty mudstone under different confining pressures and temperatures [J]. Journal of Central South University, 2020, 27(7): 1907-1916

[16] DingQ-l, JuF, SongS-b, et al. . An experimental study of fractured sandstone permeability after high-temperature treatment under different confining pressures [J]. Journal of Natural Gas Science and Engineering, 2016, 34: 55-63

[17] LanY-wei. Theoretical analysis and experimental study on relation between rock permeability and temperature [J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(12): 2009-2012(in Chinese)

[18] SunQ, ZhangZ-z, XueL, et al. . Physicomechanical properties variation of rock with phase transformation under high temperature [J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32(5): 935-942(in Chinese)

[19] TaoM, XueY-b, MaJ-w, et al. . Evolution of permeability and microscopic pore structure of sandstone and its weakening mechanism under coupled thermo-hydromechanical environment subjected to real-time high temperature [J]. Engineering Geology, 2021, 280105955

[20] ZhouY, WuZ-j, WengL, et al. . Seepage characteristics of chemical grout flow in porous sandstone with a fracture under different temperature conditions: An NMR based experimental investigation [J]. International Journal of Rock Mechanics and Mining Sciences, 2021, 142104764

[21] ChaoZ-m, MaG-t, HeK, et al. . Investigating low-permeability sandstone based on physical experiments and predictive modeling [J]. Underground Space, 2021, 6(4): 364-378

[22] NolteS, FinkR, KroossB M, et al. . Simultaneous determination of the effective stress coefficients for permeability and volumetric strain on a tight sandstone [J]. Journal of Natural Gas Science and Engineering, 2021, 95104186

[23] KamelK E M, GerardP, ColliatJ B, et al. . Modelling stress-induced permeability alterations in sandstones using CT scan-based representations of the pore space morphology [J]. International Journal of Rock Mechanics and Mining Sciences, 2022, 150104998

[24] ChaoZ-m, MaG-t, WangMeng. Experimental and numerical modelling of the mechanical behaviour of low-permeability sandstone considering hydromechanics [J]. Mechanics of Materials, 2020, 148103454

[25] WangL-m, YinS-h, DengB-n, et al. . Copper sulfides leaching assisted by acidic seawater-based media: ionic strength and mechanism [J]. Minerals Engineering, 2022, 175107286 in Chinese)

[26] HeY-l, YangL-zhong. Mechanism of effects of temperature and effective stress on permeability of sandstone [J]. Chinese Journal of Rock Mechanics Engineering, 2005, 24(14): 2420-2427

[27] ZhongX-y, ZhuY-s, LiuL-p, et al. . The characteristics and influencing factors of permeability stress sensitivity of tight sandstone reservoirs [J]. Journal of Petroleum Science and Engineering, 2020, 191107221

[28] WangL-m, ZhangX-q, YinS-h, et al. . Three-dimensional characterization of inter-particle pore network and fluid flow in segregated heap with existence of crushed ore and agglomerations [J]. Hydrometallurgy, 2023, 219106082