Method for phytomining of nickel, cobalt and other metals...

C - Chemistry – Metallurgy – 22 – B

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C22B 23/00 (2006.01) B09C 1/00 (2006.01) C22B 3/00 (2006.01) B09C 1/10 (2006.01) C22B 3/18 (2006.01)

Patent

CA 2296116

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.

Le nickel/cobalt, ainsi que les membres de la famille du platine et du palladium sont récupérés à partir du sol par la culture de plantes Brassicaceae, particulièrement les plantes du type Alyssum dans des sols qui renferment du nickel/cobalt, ainsi que d'autres métaux. On entretient le sol en maintenant un pH bas et une faible teneur en calcium et en y ajoutant un engrais d'ammonium et des agents chélateurs. On obtient une accumulation de nickel de l'ordre de 2,5 % ou plus dans des tissus situés au-dessus du sol, ce qui permet de récupérer le métal en récoltant les plantes situées au-dessus du sol, en les séchant et en les brûlant afin d'oxyder ou de vaporiser les matières organiques et de récupérer les métaux piégés à l'intérieur et présents à des teneurs 10 à 20 fois supérieures à celles régnant dans le sol, sous une forme permettant de les utiliser dans un affinage classique ou dans des opérations de fusion de Ni.

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