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Corrosion of Calcite under Different CO2 Partial Pressures
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Yufan XIE, Hui ZHANG, Feng LI, Tianze ZENG, Qian CAO, Dexin DING
Uranium Mining and Metallurgy | 2025, 44(4) : 51 - 57
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Uranium Mining and Metallurgy | 2025, 44(4): 51-57
• MINING AND HYDROMETALLURGY •
Corrosion of Calcite under Different CO2 Partial Pressures
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Yufan XIE, Hui ZHANG, Feng LI, Tianze ZENG, Qian CAO, Dexin DING
Affiliations
  • School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China
Published: 2025-11-20 doi: 10.13426/j.cnki.yky.2025.04.15
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Calcite is an important carbonate mineral in sandstone-type uranium deposits, and its corrosion-precipitation behavior directly affects the permeability of the deposits. To gain a deeper understanding of the mechanisms behind permeability decline during "CO2+O2" in-situ leaching of sandstone-type uranium deposits, the stirred leaching experiments using calcite in a high-pressure reactor under varying CO2 partial pressures was conducted. The results indicate that higher CO2 partial pressures lead to lower solution pH and higher concentrations, significantly enhancing calcite corrosion. However, the Ca2+released during corrosion can trigger secondary calcite precipitation. Differential corrosion was observed on the calcite surface, forming distinct corrosion pits. Additionally, the pore structure of calcite underwent notable changes, characterized by the disappearance of micropores, a reduction in pore volume, and an increase in average pore size. Based on the above findings, a dynamic control strategy of "high-pressure unclogging followed by low-pressure maintenance" was proposed for in-situ leaching operations, providing both theoretical foundation and engineering guidance for optimizing the "CO2+O2" in-situ uranium leaching process.

"CO2+O2"  /  in-situ leaching of uranium  /  CO2 partial pressure  /  calcite  /  pores  /  corrosion  /  permeability
谢宇帆, 张辉, 李峰, 曾天泽, 操茜, 丁德馨. 不同分压CO2对方解石的溶蚀作用. 铀矿冶, 2025 , 44 (4) : 51 -57 . DOI: 10.13426/j.cnki.yky.2025.04.15
Yufan XIE, Hui ZHANG, Feng LI, Tianze ZENG, Qian CAO, Dexin DING. Corrosion of Calcite under Different CO2 Partial Pressures[J]. Uranium Mining and Metallurgy, 2025 , 44 (4) : 51 -57 . DOI: 10.13426/j.cnki.yky.2025.04.15
Appendix
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Year 2025 volume 44 Issue 4
89
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doi: 10.13426/j.cnki.yky.2025.04.15
  • Receive Date：2025-04-23
  • Online Date：2026-09-28
  • Published：2025-11-20
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  • Received：2025-04-23
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    School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China
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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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