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A new process for nickel ammonium disulfate production from ash of the hyperaccumulating plant Alyssum murale.

Barbaroux, Romain; Plasari, Edouard; Mercier, Guy; Simonnot, Marie-Odile; Morel, Jean-Louis; Blais, Jean-François (2012). A new process for nickel ammonium disulfate production from ash of the hyperaccumulating plant Alyssum murale. Science of The Total Environment , vol. 423 . p. 111-119. DOI: 10.1016/j.scitotenv.2012.01.063.

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Résumé

La transcription des symboles et des caractères spéciaux utilisés dans la version originale de ce résumé n’a pas été possible en raison de limitations techniques. La version correcte de ce résumé peut être lue dans le document original.

The extraction of nickel (Ni) from ultramafic soils by phytomining can be achieved using Alyssum murale cultures. This study presents a new process for the valorization of Ni accumulated by this plant through the production of a Ni ammonium disulfate salt (Ni(NH4)2(SO4)2.6H2O). The process comprises an initial leaching of the ashes of A. murale with a sulphuric acid solution (1.9 M H2SO4, T = 95 °C, t = 240 min, TS = 150 g ash L− 1), producing a leachate rich in Ni (10.2 g Ni L− 1; 96% Ni solubilisation), Mg, P, K, Fe, Ca and Al. The pH of the acid leachate is increased to 5.0 with NaOH (5 M), followed by an evaporation step which produced a purified solution rich in Ni (21.3 g Ni L− 1) and an iron hydroxide precipitate. The cold crystallization (T = 2 °C, t = 6 h) of this solution by the stoichiometric addition (× 1.2) of ammonium sulfate generates a Ni ammonium disulfate salt, containing 13.2% Ni, that is potentially valuable to industry.

Type de document: Article
Informations complémentaires: Résumé avec symboles
Mots-clés libres: Alyssum murale; nickel; leaching; phytomining; metal hyperaccumulator; precipitation
Centre: Centre Eau Terre Environnement
Date de dépôt: 19 oct. 2018 14:49
Dernière modification: 19 oct. 2018 14:49
URI: http://espace.inrs.ca/id/eprint/7262

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