Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1995-06-06
1998-01-27
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
47 58, 210602, C22B 318
Patent
active
057117845
ABSTRACT:
Nickel/cobalt, as well as platinum and palladium metal family members are recovered from soil by growing Brassicaceae plants, specifically Alyssum in soil containing nickel/cobalt as well as other metals. The soil is conditioned by maintaining a low pH, low calcium concentration, and the addition of ammonium fertilizer and chelating agents thereto. Nickel accumulation on the order of 2.5 percent or better in above-ground tissues is achieved, which permits recovery of the metal by harvesting the above-ground plant materials, drying, and then combusting the same, to oxidize or vaporize organic materials and recover the metals sequestered therein at 10-20 fold higher concentrations than in the soil, in a form which can be used in conventional Ni refinery or smelting operations.
REFERENCES:
patent: 5320663 (1994-06-01), Cunningham
patent: 5364451 (1994-11-01), Raskin et al.
Salt et al., "Phytoremediation: A Novel Strategy for the Removal of Toxic Metals from the Enviroment Using Plants", Biotechnology, vol. 13, May 15, 1995 pp. 468-474.
Angle Jay Scott
Baker Alan J. M.
Chaney Rufus L.
Li Yin-Ming
Andrews Melvyn
University of Maryland at College Park
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