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<p>This study investigates the interaction mechanisms between uraninite (nominally UO<sub>2</sub>) and sulfuric acid leaching solutions. After 7&#xa0;days (d), uranium (U) concentrations reached 16,453.1&#xa0;mg L<sup>−1</sup> (61.50% extraction rate) in sulfuric acid. U leaching followed the John Mehl Avrami (JMA) model (0<b>‒</b>1&#xa0;h) and then the shrinking core model (SCM, 1&#xa0;h<b>‒</b>4 d), with U existing mainly as UO<sub>2</sub>SO<sub>4</sub>. No significant mineral phase changes occurred, but ore surface roughened with corrosion pits, porosity rose from 33.44 to 54.77% (4 d later), particle size decreased, and reaction interface moved inward—all verifying SCM adherence.</p>

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A comprehensive investigation into the interaction mechanism between uraninite and sulfuric acid leaching solutions

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Jian Wang,
  • Guangming Xu,
  • Yajie Liu,
  • Jianguo Deng,
  • Shaobo Wang,
  • Guanghui Zhao,
  • Yipeng Zhou,
  • Guangrong Li,
  • Xuegang Wang,
  • Zhongkui Zhou,
  • Pingchao Ke,
  • Lingling Xu,
  • Qin Ge,
  • Zhanxue Sun

摘要

This study investigates the interaction mechanisms between uraninite (nominally UO2) and sulfuric acid leaching solutions. After 7 days (d), uranium (U) concentrations reached 16,453.1 mg L−1 (61.50% extraction rate) in sulfuric acid. U leaching followed the John Mehl Avrami (JMA) model (0‒1 h) and then the shrinking core model (SCM, 1 h‒4 d), with U existing mainly as UO2SO4. No significant mineral phase changes occurred, but ore surface roughened with corrosion pits, porosity rose from 33.44 to 54.77% (4 d later), particle size decreased, and reaction interface moved inward—all verifying SCM adherence.