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<p>In the acid in-situ leaching process of uranium, mineral dissolution and precipitation affected ore-bearing layer permeability, limiting uranium extraction efficiency. To explore mineral dissolution/precipitation, an injection-pumping pathway in the Bayan Ula C12 mining area was monitored with three wells. Leaching solution composition was collected for 1&#xa0;year and simulated using PHREEQC. Core analysis validated the simulation. Feldspar and minor iron minerals were dissolved, while gypsum and clay minerals (illite, kaolinite) precipitated. Dissolution decreased, and precipitation increased along the flow direction. Gypsum precipitation and feldspar alteration were identified as the primary causes of pore blockage. The simulation results were consistent with the core analysis.</p>

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Spatiotemporal evolutionary patterns of mineral dissolution and precipitation (formation) amount in acid in situ leaching of uranium

  • 期刊论文

  • 发表日期：

    2025年2月6日

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

摘要

In the acid in-situ leaching process of uranium, mineral dissolution and precipitation affected ore-bearing layer permeability, limiting uranium extraction efficiency. To explore mineral dissolution/precipitation, an injection-pumping pathway in the Bayan Ula C12 mining area was monitored with three wells. Leaching solution composition was collected for 1 year and simulated using PHREEQC. Core analysis validated the simulation. Feldspar and minor iron minerals were dissolved, while gypsum and clay minerals (illite, kaolinite) precipitated. Dissolution decreased, and precipitation increased along the flow direction. Gypsum precipitation and feldspar alteration were identified as the primary causes of pore blockage. The simulation results were consistent with the core analysis.