C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 23/00 (2006.01) B09C 1/10 (2006.01) C22B 3/18 (2006.01)
Patent
CA 2272849
The recovery of nickel, cobalt and other metals by phytomining is described. Plants of the Alyssum genus are grown in nickel rich soil. The uptake of nickel is enhanced by maintaining specific soil conditions, including a concentration of calcium between (but not including) 0.128 mM and 5.0 mM and an acidic pH. Ni uptake may be further enhanced by maintaining a ratio of exchangeable Ca/Mg of 0.16-0.40. Uptake may be further enhanced by addition of chelating agents and ammonium based fertilizers.
L'invention concerne un procédé de phytoextraction de nickel, cobalt et autres métaux. A cet effet, les plantes du genre Alyssum sont cultivées dans des sols riches en nickel. On peut favoriser l'absorption du nickel en maintenant le sol dans des conditions spécifiques, par ex. une concentration en calcium supérieure à 0,128 mM et inférieure à 5,0 mM et un pH acide. On peut accroître davantage l'absorption du nickel en maintenant un rapport Ca/Mg échangeable de 0,16-0,40. Cette absorption peut être encore accrue par addition d'agents chélateurs et d'engrais à base d'ammonium.
Angle Jay Scott
Chaney Rufus L.
Li Yin-Ming
Deeth Williams Wall Llp
United States As Represented By The Secretary Of Agriculture
University Of Maryland
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