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Experiment on Hydrogeochemical Effects Affecting Uranium Migration and Transformation in Sandstone-type Uranium Deposit(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第02期
Page:
256-266
Research Field:
水资源与环境
Publishing date:

Info

Title:
Experiment on Hydrogeochemical Effects Affecting Uranium Migration and Transformation in Sandstone-type Uranium Deposit
Author(s):
YAN Yu-meng1; 2;  SU Dong3;  SU Xiao-si2; 4*;  LYU Hang1; 2;  WANG Wei5
(1. New Energy and Environment College, Jilin University, Changchun 130021, Jilin, China; 2. Institute of Water Resources and Environment, Jilin University, Changchun 130021, Jilin, China; 3. Geological Survey of Jiangsu Province, Nanjing 210018, Jiangsu, China; 4. Construction Engineering College, Jilin University, Changchun 130021, Jilin, China; 5. Tianjin Center, China Geological Survey, Tianjin 300170, China)
Keywords:
hydrogeochemistry;  sandstone-type uranium deposit;  migration and transformation;  soil column experiment;  oxidation;  desorption;  dissolution;  in-situ leaching of uranium
PACS:
P641.3; TD983
DOI:
10.19814/j.jese.2019.11002
Abstract:
Seven sets of indoor soil column simulation experiments of uranium-containing ore samples from sandstone-type uranium deposit in the northern China were carried out, and the effects of redox conditions, HCO-3 concentration, organic matter and microorganisms on uranium migration and transformation were investigated. The results show that the changes of redox conditions have an important impact on uranium migration and transformation, the oxidizing environment brought by the infiltration of oxygenated water can cause a large amount of sedimentary uranium oxidation and dissolution in aqueous medium; the promoting desorption of HCO-3 and the strong migration ability of uranyl complexes have a great impact on uranium migration and transformation in groundwater; the organic matter can participate in the competition of mineral adsorption sites in aqueous medium, which causes the desorption of uranium; the microbes as catalysts for redox reactions play an important role in the oxidation of sedimentary uranium; the contribution ratios of the oxidation, desorption and dissolution to uranium migration and transformation in groundwater are 65.28%, 23.91% and 10.81%, respectively.

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Last Update: 2020-03-24