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The Lofdal rare earth elementRare Earth Element (REE) (REE) project is one of the few rare earth deposits in the world that contains mostlyHeavy rare earth elements heavy rare earthRare Earth Element (REE) elements (~ 75% HREO distribution). The mineralogy of the Lofdal project is complex, with xenotimeXenotime as the primary rare earth hosting mineral, and silicates, calcite, and iron-oxide as the main gangue minerals. A 2023 flotation pilot plant produced a ~ 93 kg concentrate sample, which was used for acid bakeAcid Bake (AB) scale-up tests and simplification of the liquor treatment process to recover a mixed heavy REE carbonate from the concentrate. This paper provides an update on the laboratory testing programs conducted to develop a significantly simplified process.

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Production of HREE Carbonate from the Lofdal HREE Flotation Concentrate Using a Simplified Hydrometallurgical Flowsheet

  • 会议论文

  • 发表日期：

    2025年

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

摘要

The Lofdal rare earth elementRare Earth Element (REE) (REE) project is one of the few rare earth deposits in the world that contains mostlyHeavy rare earth elements heavy rare earthRare Earth Element (REE) elements (~ 75% HREO distribution). The mineralogy of the Lofdal project is complex, with xenotimeXenotime as the primary rare earth hosting mineral, and silicates, calcite, and iron-oxide as the main gangue minerals. A 2023 flotation pilot plant produced a ~ 93 kg concentrate sample, which was used for acid bakeAcid Bake (AB) scale-up tests and simplification of the liquor treatment process to recover a mixed heavy REE carbonate from the concentrate. This paper provides an update on the laboratory testing programs conducted to develop a significantly simplified process.