Method of reclaiming nickel values from a nickeliferous alloy

Details Method of reclaiming nickel values from a nickeliferous alloy Method of reclaiming nickel values from a nickeliferous alloy

C - Chemistry, Metallurgy

22

B

53/305, 23/412

C22B 7/00 (2006.01) C01G 53/00 (2006.01) C01G 53/04 (2006.01) C22B 3/02 (2006.01) C22B 23/00 (2006.01) C25C 1/08 (2006.01) C25C 5/00 (2006.01)

Patent

CA 1049267

ABSTRACT OF THE DISCLOSURE This invention relates to a method of reclaiming nickel values from nickeliferous alloys, such as ferro-nickel and including nickel, reclaimed by the method The specification discloses a method of reclaiming nickel values from a nickeliferous alloy with a wider permissible range of iron and nickel contents, which method does not require elaborate crushing of the starting material. The invention also relates to a method of the afore- mentioned kind which, from the first step onwards, can be used to eliminate the iron in an environmentally acceptable form, and to eliminate certain impurities such as chromium, aluminium and silica. Another object of the invention is to reclaim a nickel salt which can easily be converted into an oxide or a metal The method of reclaiming nickel value from a nickeliferous alloy, such as ferro-nickel, according to the invention, comprises sub- jecting the nickeliferous alloy to nitric lixiviation and recovering nickel values from the resulting nickel nitrate solution. Such nitric lixiviation of the nickeliferous alloy is advantageously performed at a temperature between 80 and 100°C, using nitric acid preferably in aqueous solution and having a normality between 1N and 14N, preferably between 5N and 10N. The lixiviation process is more efficient if the nickeliferous alloy is in granulated form, the granules having an average size of the order of a millimetre Preferably, the nitric lixiviation is performed in the presence of oxygen, usually either from the air or injected into the reactor

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