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<p>To resolve the challenging of efficient recovering uranium and zirconium resources from flotation zircon concentrates, the simultaneous leaching process of uranium and zirconium via NaOH alkali fusion followed by H<sub>2</sub>SO<sub>4</sub> leaching was carried out. Systematic investigations were conducted on the effects of the mass ratio of NaOH to zircon concentrate, alkali fusion temperature, leaching temperature, and leaching time on the leaching rates of uranium and zirconium. The results demonstrated that under optimal conditions of NaOH/zircon concentrate mass ratio of 1.5:1, alkali fusion temperature of 750&#xa0;°C, leaching temperature of 90&#xa0;°C and leaching time of 1&#xa0;h, the leaching rates of uranium and zirconium reached 93.8 and 99.2%, respectively. Mechanistic analysis revealed that alkali fusion effectively disrupts the compact structure of zircon (ZrSiO<sub>4</sub>), forming soluble sodium zirconate (Na<sub>2</sub>ZrO<sub>3</sub>) and sodium uranate (Na<sub>2</sub>UO<sub>4</sub>). Subsequently, H<sub>2</sub>SO<sub>4</sub> leaching promotes the formation of uranyl sulfate (UO<sub>2</sub>SO<sub>4</sub>) and zirconium sulfate (Zr(SO<sub>4</sub>)<sub>2</sub>), enabling highly efficient dissolution of uranium and zirconium.</p>

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Simultaneous leaching mechanism of uranium and zirconium from zircon concentrate using alkali fusion-acid leaching process

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Xinwei Liu,
  • Yulin Huang,
  • Qingliang Wang,
  • Zhiwu Lei,
  • Jiacheng Bao,
  • Hongqiang Wang,
  • Eming Hu

摘要

To resolve the challenging of efficient recovering uranium and zirconium resources from flotation zircon concentrates, the simultaneous leaching process of uranium and zirconium via NaOH alkali fusion followed by H2SO4 leaching was carried out. Systematic investigations were conducted on the effects of the mass ratio of NaOH to zircon concentrate, alkali fusion temperature, leaching temperature, and leaching time on the leaching rates of uranium and zirconium. The results demonstrated that under optimal conditions of NaOH/zircon concentrate mass ratio of 1.5:1, alkali fusion temperature of 750 °C, leaching temperature of 90 °C and leaching time of 1 h, the leaching rates of uranium and zirconium reached 93.8 and 99.2%, respectively. Mechanistic analysis revealed that alkali fusion effectively disrupts the compact structure of zircon (ZrSiO4), forming soluble sodium zirconate (Na2ZrO3) and sodium uranate (Na2UO4). Subsequently, H2SO4 leaching promotes the formation of uranyl sulfate (UO2SO4) and zirconium sulfate (Zr(SO4)2), enabling highly efficient dissolution of uranium and zirconium.