Method for separating cobalt, nickel, and aluminum ions in sulfu

Details Method for separating cobalt, nickel, and aluminum ions in sulfu Method for separating cobalt, nickel, and aluminum ions in sulfu

1993-12-07

1995-11-28

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Iron group metal

423531, B01D 1100, C22B 2300, C22B 2100

Patent

active

054705533

ABSTRACT:
A method for separating aluminum, cobalt, and nickel ions contained in a sulfuric acid aqueous solution comprising the steps of (a) contacting a first water-immiscible organic solution containing a first extractant with the sulfuric acid aqueous solution for a period of time to selectively extract the Co ions into the first water-immiscible organic solution so as to obtain a Co-containing first organic phase and a first raffinate aqueous phase containing substantially no Co ions; (b) separating the Co-containing first organic phase from the first raffinate aqueous; (c) contacting a second water-immiscible organic solution containing the first extractant and a second extractant with the first raffinate aqueous solution for a period of time to selectively extract Ni ions into the second water-immiscible organic solution so as to obtain a Ni-containing second organic phase and a second raffinate aqueous phase containing substantially only Al ions; (d) separating the Ni-containing second organic phase from the second raffinate aqueous phase; (e) wherein the said first extractant is dialkyl dithiophosphinic acid or its salt is represented by the following formula: ##STR1## wherein R.sub.1 and R.sub.2 are C.sub.6 to C.sub.18 alkyl radicals; and X is H, NH.sub.4.sup.+, or alkali metal ions; and the second extractant is trialkyl phosphonate is represented by the following formula: ##STR2## wherein R.sub.3, R.sub.4, R.sub.5 are C.sub.3 to C.sub.18 alkyl radicals. The preferred first extractant is bis(2,4,4-trimethyl pentyl) dithiophosphinic acid and the preferred second extractant is dibutylbutyl phosphonate.

REFERENCES:
patent: 3455680 (1969-07-01), Ashbrook et al.
patent: 4088733 (1978-05-01), De Schepper et al.
patent: 4657642 (1987-04-01), Miller et al.
patent: 4721606 (1988-01-01), Tilley
Structure for Dibutylbutylphosphonate, registry No. 78-46-6, no date.
Brian K. Tait "The Extraction of Some Base Metal Ions by Cyanex 301, Cyanex 302 and Their Binary Extractant Mixtures with Aliquat 336" Solvent Extraction and Ion Exchange, 10(5), pp. 799-809, 1992, no month.

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