Kinetics of Uranium Extraction from Uranium Tailings by Oxidative Leaching

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• 作者：Biao Zhang ; Mi Li ; Xiaowen Zhang ; Jing Huang
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：68
• 期：7
• 页码：1990-2001
• 全文大小：3,772 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851
• 卷排序：68

文摘

Extraction of uranium from uranium tailings by oxidative leaching with hydrogen peroxide (H₂O₂) was studied. The effects of various extraction factors were investigated to optimize the dissolution conditions, as well as to determine the leaching kinetic parameters. The behavior of H₂O₂ in the leaching process was determined through scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX) and x-ray diffraction analysis of leaching residues. Results suggest that H₂O₂ can significantly improve uranium extraction by decomposing the complex gangue structures in uranium tailings and by enhancing the reaction rate between uranium phases and the leaching agent. The extraction kinetics expression was changed from 1 − 3(1 − α)2/3 + 2(1 − α) = K₀(H₂SO₄)−0.14903(S/L)−1.80435(R_o)0.20023e−1670.93/Tt (t ≥ 5) to 1 − 3(1 − α)2/3 + 2(1 − α) = K₀(H₂SO₄)0.01382(S/L)−1.83275(R_o)0.25763e−1654.59/Tt (t ≥ 5) by the addition of H₂O₂ in the leaching process. The use of H₂O₂ in uranium leaching may help in extracting uranium more efficiently and rapidly from low-uranium-containing ores or tailings.