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The Lofdal REE project is one of the few rare earth deposits in the world that contains mostly heavy rare earth elements (~75% HREO distribution). The mineralogy of the Lofdal project is complex, with xenotime as the primary rare earth hosting mineral and silicates, calcite, and iron oxide as the main gangue minerals. The beneficiation flowsheet developed for the Lofdal project in previous studies was further optimized on the run of mine samples and piloted at SGS Canada. The flotation pilot plant produced a ~93 kg concentrate sample for further optimization and scale-up testwork of the hydrometallurgical steps to recover the HREE from the concentrate. This paper provides an update on the laboratory testing programs conducted to develop the process.

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The Beneficiation and Hydrometallurgical Process Development for the Lofdal HREE Project: An Update

  • 会议论文

  • 发表日期：

    2025年

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  • Jing Liu,
  • Eileen Ross L. Espiritu,
  • Niels Verbaan,
  • Tassos Grammatikopoulos,
  • Micheal Archer,
  • Barbara Mulcahy,
  • Rainer Ellmies

摘要

The Lofdal REE project is one of the few rare earth deposits in the world that contains mostly heavy rare earth elements (~75% HREO distribution). The mineralogy of the Lofdal project is complex, with xenotime as the primary rare earth hosting mineral and silicates, calcite, and iron oxide as the main gangue minerals. The beneficiation flowsheet developed for the Lofdal project in previous studies was further optimized on the run of mine samples and piloted at SGS Canada. The flotation pilot plant produced a ~93 kg concentrate sample for further optimization and scale-up testwork of the hydrometallurgical steps to recover the HREE from the concentrate. This paper provides an update on the laboratory testing programs conducted to develop the process.