TY  - JOUR
AU  - Zeng, S.
AU  - Shen, Y.
AU  - Sun, B.
AU  - Zhang, N.
AU  - Zhang, S.
AU  - Feng, S.
PY  - 2021//
TI  - Pore structure evolution characteristics of sandstone uranium ore during acid leaching
JO  - Nuclear Engineering and Technology
SP  - 4033
EP  - 4041
VL  - 53
IS  - 12
KW  - Acid method
KW  - In situ leaching
KW  - Nuclear magnetic resonance
KW  - Pore characteristic
KW  - Sandstone uranium ore
N2  - To better understand the permeability of uranium sandstone, improve the leaching rate of uranium, and explore the change law of pore structure characteristics and blocking mechanism during leaching, we systematically analyzed the microstructure of acid-leaching uranium sandstone. We investigated the variable rules of pore structure characteristics based on nuclear magnetic resonance (NMR). The results showed the following: (1) The uranium concentration change followed the exponential law during uranium deposits acid leaching. After 24 h, the uranium leaching rate reached 50%. The uranium leaching slowed gradually over the next 4 days. (2) Combined with the regularity of porosity variation, Stages I and II included chemical plugging controlled by surface reaction. Stage I was the major completion phase of uranium displacement with saturation precipitation of calcium sulfate. Stage II mainly precipitated iron (III) oxide-hydroxide and aluminum hydroxide. Stage III involved physical clogging controlled by diffusion. (3) In the three stages of leaching, the permeability of the leaching solution changed with the pore structure, which first decreased, then increased, and then decreased.
SN  - 1738-5733
UR  - https://www.sciencedirect.com/science/article/pii/S1738573321003326
N1  - exported from refbase (http://www.uhydro.de/base/show.php?record=199), last updated on Fri, 26 Jan 2024 13:19:04 +0100
ID  - Zeng_etal2021
ER  -