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<p>During in-situ leaching (ISL) of uranium, uranium and other minerals dissolved along the leaching solution flow, altering its chemical composition. To study the spatial distribution of these changes and mineral dissolution–precipitation patterns, this research focused on the southern injection-extraction unit of Bayan-Ula uranium mine’s C12 area. Hydrogeochemical simulations revealed that as the leaching solution flowed through JCZK1, JCZK2, and JCZK3, pH increased while Eh decreased. K<sup>+</sup> and Na<sup>+</sup> concentrations rose, Ca<sup>2</sup><sup>+</sup> peaked then declined, and SO<sub>4</sub><sup>2</sup>⁻ decreased. Near pumping wells, slower flow enhanced mineral reactions, acid consumption, and dissolution–precipitation effects.</p>

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Spatial evolution characteristics of leaching solution components and simulation of mineral dissolution–precipitation equilibrium in acidic in situ leaching of uranium

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Ting He,
  • Xuefeng Liu,
  • Jinhui Liu,
  • Yongguo Xing,
  • Yihan Yang,
  • Ruyi Wang

摘要

During in-situ leaching (ISL) of uranium, uranium and other minerals dissolved along the leaching solution flow, altering its chemical composition. To study the spatial distribution of these changes and mineral dissolution–precipitation patterns, this research focused on the southern injection-extraction unit of Bayan-Ula uranium mine’s C12 area. Hydrogeochemical simulations revealed that as the leaching solution flowed through JCZK1, JCZK2, and JCZK3, pH increased while Eh decreased. K+ and Na+ concentrations rose, Ca2+ peaked then declined, and SO42⁻ decreased. Near pumping wells, slower flow enhanced mineral reactions, acid consumption, and dissolution–precipitation effects.