Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Iron group metal
Reexamination Certificate
2000-12-19
2010-06-01
Silverman, Stanley (Department: 1793)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Iron group metal
C210S634000
Reexamination Certificate
active
07727496
ABSTRACT:
The present invention relates generally to a method of extracting cobalt and other impurity metals from a concentrated nickel sulphate solution by a solvent extraction process whereby a cationic solvent extractant is separately pre-equilibrated with a portion of a purified nickel sulphate solution in such a manner that it is loaded with nickel without precipitating insoluble nickel double salts. The nickel loaded extracted is then transferred to an impure cobalt nickel solution where the cobalt and certain other impurity metals exchange with nickel leaving a purified concentrated nickel sulphate solution suitable for hydrogen reduction or electrowinning. The cobalt loaded extractant is stripped with dilute sulphuric acid before being recycled while an aqueous cobalt stripped solution is further processed to recover cobalt.
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Statement of Grounds and Particulars, In the Matter of Australian Patent Application 200123288 (782112) in the name of WMC Resources Limited.
Chamberlain Tony
O'Callaghan John
Miles & Stockbridge P.C.
Minter, Esq. Michael A.
Schaffer, Esq. David R.
Silverman Stanley
Wartalowicz Paul
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