Pore structure evolution and mechanism of plugging during dissolution-erosion of acid leaching minerals from uranium-bearing sandstone
Mineral dissolution and erosion during the leaching of uranium-bearing sandstone have profound effects on the evolution of pore structure and uranium leaching rate. X-ray diffraction (XRD), scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR) techniques were used to characterise...
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| Published in | Hydrometallurgy Vol. 236; p. 106511 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
01.10.2025
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| Abstract | Mineral dissolution and erosion during the leaching of uranium-bearing sandstone have profound effects on the evolution of pore structure and uranium leaching rate. X-ray diffraction (XRD), scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR) techniques were used to characterise mineral changes and pore structure evolution in samples. The results indicate that during the in situ leaching process, feldspar was transformed into clay minerals and quartz. Dolomite and calcite completely dissolved and formed a large amount of Ca2+, which increased the content of CaSO4. The CaSO4 and MgSiO3 precipitated particles formed in the reaction blocked the pores or migrated with the leaching solution, and the porosity of the sandstone initially decreased and then increased. Furthermore, the pores were divided into micropores, mesopores, and macropores, and combined with NMR fractal theory, it was found that the pore structure of sandstone exhibited multifractal characteristics. The obtained pore fractal dimension had a positive correlation with quartz, dolomite, calcite, and feldspar contents, whereas the other mineral components showed a negative correlation. This study provides a theoretical reference for understanding the mechanism of pore plugging and optimising the deplugging process in acid leaching for uranium extraction.
•CaSO4 and MgSiO3 produced were the main precipitates that cause pore plugging.•The pore structure of uranium-bearing sandstone was complex during leaching.•The fluid forces led to changes in the pore structure of sandstone uranium ore.•The effect of different mineral components on pore structure was different. |
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| AbstractList | Mineral dissolution and erosion during the leaching of uranium-bearing sandstone have profound effects on the evolution of pore structure and uranium leaching rate. X-ray diffraction (XRD), scanning electron microscopy (SEM), and nuclear magnetic resonance (NMR) techniques were used to characterise mineral changes and pore structure evolution in samples. The results indicate that during the in situ leaching process, feldspar was transformed into clay minerals and quartz. Dolomite and calcite completely dissolved and formed a large amount of Ca2+, which increased the content of CaSO4. The CaSO4 and MgSiO3 precipitated particles formed in the reaction blocked the pores or migrated with the leaching solution, and the porosity of the sandstone initially decreased and then increased. Furthermore, the pores were divided into micropores, mesopores, and macropores, and combined with NMR fractal theory, it was found that the pore structure of sandstone exhibited multifractal characteristics. The obtained pore fractal dimension had a positive correlation with quartz, dolomite, calcite, and feldspar contents, whereas the other mineral components showed a negative correlation. This study provides a theoretical reference for understanding the mechanism of pore plugging and optimising the deplugging process in acid leaching for uranium extraction.
•CaSO4 and MgSiO3 produced were the main precipitates that cause pore plugging.•The pore structure of uranium-bearing sandstone was complex during leaching.•The fluid forces led to changes in the pore structure of sandstone uranium ore.•The effect of different mineral components on pore structure was different. |
| ArticleNumber | 106511 |
| Author | Cai, Qiue Li, Junzhe Zeng, Sheng Song, Jiayin Sun, Bing Li, Hao |
| Author_xml | – sequence: 1 givenname: Jiayin surname: Song fullname: Song, Jiayin organization: School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China – sequence: 2 givenname: Bing surname: Sun fullname: Sun, Bing organization: School of Civil Engineering, University of South China, Hengyang 421001, China – sequence: 3 givenname: Qiue surname: Cai fullname: Cai, Qiue organization: School of Mathematics and Physics, University of South China, Hengyang 421001, China – sequence: 4 givenname: Junzhe surname: Li fullname: Li, Junzhe organization: School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China – sequence: 5 givenname: Hao surname: Li fullname: Li, Hao organization: School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China – sequence: 6 givenname: Sheng surname: Zeng fullname: Zeng, Sheng email: usczengs@126.com organization: School of Resources Environment and Safety Engineering, University of South China, Hengyang 421001, China |
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| Keywords | Mineral precipitate Pore plugging Dissolution-erosion In-situ leaching Multifractal characteristics |
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| Title | Pore structure evolution and mechanism of plugging during dissolution-erosion of acid leaching minerals from uranium-bearing sandstone |
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