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Evolution Characteristics of Pore Structure During Alkaline In-Situ Leaching of Sandstone Type Uranium Deposit
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Xin YANG1, 2, Tong ZHANG2, 3, Zhiming DU4, Ming TANG2, 3, Yanfang LI2, 3, Junlin MAO1, 2, Mingchao WANG2, 3
Mining and Metallurgical Engineering | 2023, 43(2) : 21 - 25
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Mining and Metallurgical Engineering | 2023, 43(2): 21-25
• MINING •
Evolution Characteristics of Pore Structure During Alkaline In-Situ Leaching of Sandstone Type Uranium Deposit
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Xin YANG1, 2, Tong ZHANG2, 3, Zhiming DU4, Ming TANG2, 3, Yanfang LI2, 3, Junlin MAO1, 2, Mingchao WANG2, 3
Affiliations
  • 1.School of Mining Engineering, Anhui University of Science and Technology, Huainan 232000, Anhui, China
  • 2.Institute of Energy, Hefei Comprehensive National Science Center (Anhui Energy Laboratory), Hefei 230031, Anhui, China
  • 3.School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232000, Anhui, China
  • 4.Beijing Research Institute of Chemical Engineering Metallurgy, Beijing 101149, China
Published: 2023-04-01 doi: 10.3969/j.issn.0253-6099.2023.02.005
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A core of uranium deposit was taken in an experiment of column leaching with alkaline solution (NaHCO3+H2O2), and then the surface characteristics and pore distribution of sandstone-type uranium deposit were analyzed by using scanning electron microscope images. The variation in the microscopic pore structure of uranium-bearing sandstone in alkaline in situ leaching process was characterized by using T2 spectrum of nuclear magnetic resonance (NMR). The results show that the matrix in the core firstly becomes connected pores due to chemical dissolution of leaching solution, resulting in more pore throats among large and small pores. The Al(OH)3 mineral colloid and CaCO3 generated by the reaction are deposited intensively in the pores and microcracks, which reduces the effective reaction area between leaching solution and matrix, thus reducing the uranium leaching efficiency. During the period of 97-158 h, dissolution is predominant, leading to the amount of chemical dissolution much higher than the amount of precipitation and accumulation, thus forming a large number of connected pores. Further reaction and dissolution of uranium minerals in the leaching solution can increase the recovery of uranium mineral to the peak.

sandstone-type uranium deposit  /  alkaline in-situ leaching  /  pore structure  /  nuclear magnetic resonance (NMR)  /  uranium  /  column leaching
Xin YANG, Tong ZHANG, Zhiming DU, Ming TANG, Yanfang LI, Junlin MAO, Mingchao WANG. Evolution Characteristics of Pore Structure During Alkaline In-Situ Leaching of Sandstone Type Uranium Deposit[J]. Mining and Metallurgical Engineering, 2023 , 43 (2) : 21 -25 . DOI: 10.3969/j.issn.0253-6099.2023.02.005
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doi: 10.3969/j.issn.0253-6099.2023.02.005
  • Receive Date：2022-09-21
  • Online Date：2026-03-05
  • Published：2023-04-01
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  • Received：2022-09-21
Funding
Affiliations
    1.School of Mining Engineering, Anhui University of Science and Technology, Huainan 232000, Anhui, China
    2.Institute of Energy, Hefei Comprehensive National Science Center (Anhui Energy Laboratory), Hefei 230031, Anhui, China
    3.School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan 232000, Anhui, China
    4.Beijing Research Institute of Chemical Engineering Metallurgy, Beijing 101149, China
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https://castjournals.cast.org.cn/joweb/kygczz/EN/10.3969/j.issn.0253-6099.2023.02.005
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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