期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 423, 期 -, 页码 111-119出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2012.01.063
关键词
Alyssum murale; Nickel; Leaching; Phytomining; Metal hyperaccumulator; Precipitation
资金
- Ministere du Developpement Economique, de l'Innovation et de l'Exportation (MDEIE)
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs
- Institut National Polytechnique de Lorraine
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)center dot 6H(2)O). The process comprises an initial leaching of the ashes of A. murale with a sulphuric acid solution (1.9 M H2SO4, T = 95 degrees 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 (213 g Ni L-1) and an iron hydroxide precipitate. The cold crystallization (T = 2 degrees C, t = 6 h) of this solution by the stoichiometric addition (x 12) of ammonium sulfate generates a Ni ammonium disulfate salt, containing 13.2% Ni, that is potentially valuable to industry. (C) 2012 Elsevier B.V. All rights reserved.
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