The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 1995
Filed:
Dec. 07, 1993
Industrial Technology Research Institute, Hsinchu, TW;
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.