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Hydrometallurgical treatment of Ni hyperaccumulator biomass : from plants to end-products

Abstract : More than 400 plants in the world are able to accumulate nickel (Ni) in their aerial parts at concentrations higher than 10 g per kg of dry biomass. Then, Ni can be recovered from the biomass of these hyperaccumulator plants. Agromining is a chain consisting in growing such plants and producing metal. It has been developed thanks to the combined know-how of agronomy and hydrometallurgy. Hydrometallurgical processes have been designed; two different pathways were developed: i) acid leaching of ashes after biomass combustion and ii) direct Ni water extraction after biomass grinding. Experiments with 2 species of Ni hyperaccumulators (A. murale from the Balkans and R. bengalensis from Malaysia) have shown that the first process is very robust and transposable. For the second one, the way Ni is stored in the plant has a strong influence on extraction. A. murale transformation was explored in more details from the lab scale to the pilot scale. Results proved that Ni is totally transferred into the aqueous phase after 2 hours at 90 °C. A life cycle assessment has clearly shown the environmental interest of this approach (especially by detoxifying agricultural soils).
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Submitted on : Thursday, November 7, 2019 - 4:20:53 PM
Last modification on : Saturday, October 15, 2022 - 3:52:23 AM




  • HAL Id : hal-02354278, version 1


Mathilde Guilpain, Baptiste Laubie, Claire Hazotte, Bastien Jally, Vivian Houzelot, et al.. Hydrometallurgical treatment of Ni hyperaccumulator biomass : from plants to end-products. International Mineral Processing Congress (IMPC 2018), Sep 2018, Moscou, Russia. Paper #927. ⟨hal-02354278⟩



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