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Estonian phosphorite contains substantial quantities of rare earth metals, making it a potential source for these valuable materials, reported the Estonian Geological Survey which has been conducting research and development since 2023 to identify the best technological solutions for processing Estonian phosphorite.
As part of this initiative, nearly 30 tons of test samples will soon be collected from the northern edge of the Aru-Lõuna limestone quarry. After drilling, the raw material will be transported to the storage facilities at the Arbavere Research Center, operated by the Estonian Geological Survey, for safekeeping. Subsequently, more detailed experimental research and development work will commence, focusing on the co-beneficiation of phosphorus and rare earth metals.
Birgit Metsa, a technology expert at the Estonian Geological Survey, noted that while various methods are used globally for phosphate ore processing, it is impossible to determine their suitability for Estonian phosphorite without thorough analysis. Moreover, assessing the potential to economically extract rare earth metals from phosphorite with minimal environmental impact requires extensive study. “Currently, no significant, sustainable, and economically viable technology exists for extracting rare earth metals from phosphorite,” she explained.“After a comprehensive review of the research conducted so far, we concluded that treatment with sulfuric acid or hydrochloric acid might be appropriate for processing Estonian phosphorite. We aim to obtain a scientifically based evaluation of the feasibility of these processes within the framework of our ongoing research,” Ms Metsa added.
The research and development project encompasses full-scale modelling and assessment of the process, starting from the initial need for ore beneficiation to the separation of phosphorus and rare earth metals, and the characterization of all process by-products. The project will culminate in a preliminary feasibility study and technological demonstrations to determine the potential applicability and estimated costs of the process.
Initial tests involving the extraction of rare earth metals using sulfuric and hydrochloric acid treatments will be conducted on a laboratory scale. Since data from these small-scale tests may not provide sufficient accuracy for decision-making, larger-scale (pilot) testing will also be undertaken. Currently, Estonia lacks the necessary facilities for such pilot-scale testing, prompting the Estonian Geological Survey to negotiate with various international research institutions.
“Initially, we intended to commission all testing from a single laboratory. However, during negotiations, it became apparent that no single facility worldwide could fully meet our requirements,” Ms Metsa concluded.
“Source:CEENERGYNEWS.com”
