Factors influencing in-situ leaching of uranium mining in a sandstone deposit in Shihongtan, Northwest China

LIU Jin-hui; SUN Zhan-xue; SHI Wei-jun; ZHOU Yi-peng

Volume 3 Issue 1

Mar. 2015

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LIU Jin-hui, SUN Zhan-xue, SHI Wei-jun, et al. 2015: Factors influencing in-situ leaching of uranium mining in a sandstone deposit in Shihongtan, Northwest China. Journal of Groundwater Science and Engineering, 3(1): 16-20.

Citation:

LIU Jin-hui, SUN Zhan-xue, SHI Wei-jun, et al. 2015: Factors influencing in-situ leaching of uranium mining in a sandstone deposit in Shihongtan, Northwest China. Journal of Groundwater Science and Engineering, 3(1): 16-20.

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Factors influencing in-situ leaching of uranium mining in a sandstone deposit in Shihongtan, Northwest China

1East China Institute of Technology, Nanchang 330013, China.2 Fundamental Science on Radioactive Geology and Exploration Technology Laboratory. East China Institute of Technology, Nanchang 330013, China.

Publish Date: 2015-03-28

Abstract

Abstract

The Shihongtan uranium deposit in northwest China is a sandstone-type deposit suitable for alkaline in-situ leaching exploitation of uranium. Alkaline leaching tends to result in CaCO3 precipitation there by affecting the porosity of the ore-bearing aquifer. CaCO3 deposits can also block pumping and injection holes if the formulation parameters of the leaching solution are not well controlled. However, controlling these parameters to operate the in-situ leaching process is challenging. Our study demonstrates that the dissolved uranium concentration in the leaching solution increases as HCO3－ concentration increases. Therefore, the most suitable HCO3－ concentration to use as leaching solution is defined by the boundary value of the HCO3－ concentration that controls CaCO3 dissolution-precipitation. That is, the dissolution and precipitation of calcite is closely related to pH, Ca2+ and HCO3－ concentration. The pH and Ca2+ concentration are the main factors limiting HCO3－ concentration in the leaching solution. The higher the pH and Ca2+ concentration, the lower the boundary value of HCO3－ concentration, and therefore the more unfavorable to in-situ leaching of uranium.
- Sandstone-type uranium deposit,
- In-situ leaching,
- Boundary value,
- Saturation index

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References(7)

References

NIU Xue-jun, TAN Ya-hui, SU Yan-ru, et al. 2013. Development direction and key task of uranium mining and metallurgy techniques in China. Uranium Ming and Metallurgy, 32(1): 22-26.

SHI Wei-jun, SUN Zhan-xue. 2005. Apply hydrogeochemistry. Beijing: Atomic Energy Press.

LUAN En-jie. 2002. The national defense science and technology NOUN ceremony. Atomic Energy Press.

DU Zhi-ming, NIU Xue-jun, SU Xue-bin. 2013. CO2+O2 in-situ leaching test of one uranium deposit in Inner Mongolia. Uranium Ming and Metallurgy, 32(1):1-4.

Parkhurst D L, Appelo C A J. 1999. User’s guide to PHREEQC (version 2): A computer program for speciation, batch reaction, one- dimensional transport and inverse geo?chemical calculations. Denver, Colo: U.S. Department of the Interior, U.S. Geological Survey.

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WANG Hai-feng, WU Wei, TANG Qing-si, et al. 2007. Alikaline in-situ leaching test of a uranium deposit in Xinjiang. Uranium Mining and Metallurgy, 26(4):169-173.

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