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REE recovery from mine tailings via the hyperaccumulator D. dichotoma

Abstract : Agromining aims at recovering metals from different secondary resources with hyperaccumulating plants. These natural plants can selectively concentrate metals at very high level and can be transformed to produce commercial compounds. The classical strategy to recover metals from hyperaccumulator plants is based on hydrometallurgy. It consists of: i) burning the plant to obtain ash, which is a very rich bio-ore without organic matter, ii) transferring the target element(s) into aqueous solution by acid leaching and iii) purifying the leach liquor to obtain the target element(s) in the desired form. This method has enabled us to obtain nickel salts, nickel oxide, zinc and cadmium from different plants. However, it is not possible to apply this approach to recover rare earth elements (REEs) from the fern D. dichotoma, growing on mine tailings in South China. Actually, this plant is very rich in silicon: plant burning gives an amorphous ash, very stable despite severe leaching conditions. Therefore, the strategy has been changed and processes are currently developed to extract REEs by direct leaching of the biomass, without burning the plant. Several conditions (i.e. leaching solutions) have been investigated, showing that a good extraction yield was obtained with HNO3 0.5 N (around 84%). This yield was increased to 99% by adding a complexing resin into the leaching solution. After two-steps of elution, results have shown that is possible to recover 75% of the REEs at 81% purity.
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https://hal.univ-lorraine.fr/hal-02353822
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Submitted on : Thursday, November 7, 2019 - 2:36:42 PM
Last modification on : Saturday, October 15, 2022 - 3:52:37 AM

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  • HAL Id : hal-02353822, version 1

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Zeinab Chour, Baptiste Laubie, Ye-Tao Tang, Rongliang Qiu, Jean Louis Morel, et al.. REE recovery from mine tailings via the hyperaccumulator D. dichotoma. 29th International Mineral Processing Congress Proceedings, Sep 2018, Moscou, Russia. ⟨hal-02353822⟩

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