Process for recovering a metal from an aqueous solution comprising a mixture of metal chlorides
AssigneeHenkel Corporation
InventorsRobert B. Sudderth, Archibald W. Fletcher, Stephen M. Olafson
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Abstract
A process for recovery of metal values from a mixed metal chloride containing leach solution by contacting the leach solution with a water immiscible solution of a complexing agent selective for the neutral chloride of the metal to be recovered and a chelating agent having affinity for the cation of the metal to be recovered. The chloride ion is washed from the water immiscible solution by contact with a chloride ion washing solution. The water immiscible solution containing the chelated metal ion is stripped with an aqueous stripping solution. The metal is recovered from the aqueous stripping solution.
Claims21
A process for recovering metal values from an aqueous solution comprising a mixture of metal chlorides which comprises:
- (A) contacting the aqueous solution comprising a mixture of metal chlorides with an organic solution of a complexing agent, selective for the neutral metal chloride of the metal to be recovered, and a chelating agent having affinity for the cation of the metal to be recovered, in a water immiscible solvent, to form an organic solution containing a complex of the complexing agent and the neutral metal chloride of the metal to be recovered in the water immiscible solvent;
- (B) separating the water immiscible solvent from the aqueous solution comprising the mixture of metal chlorides;
- (C) contacting the water immiscible solvent, containing the neutral metal chloride complex, with an aqueous chloride washing solution to remove chloride ions from the water immiscible solvent and simultaneously chelate the cation of the metal to be recovered in solution in the water immiscible solvent;
- (D) contacting the water immiscible solvent containing the chelated cation of the metal to be recovered with an aqueous stripping solution to form an aqueous solution rich in the cation of the metal to be recovered and a water immiscible solvent containing a reduced amount of chelated cation of the metal to be recovered;
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- (E) recovering the metal from the aqueous solution rich in the cation of the metal to be recovered.
A process for recovering metal values from an aqueous solution comprising a mixture of metal chlorides which comprises:
- (A) contacting the aqueous solution comprising metal chlorides with a solution of a complexing agent, for the neutral metal chloride of the metal to the recovered, and a chelating agent having affinity for the cation of the metal to be recovered, in a water immiscible solvent, to form an organic solution containing a complex of the complexing agent and the neutral metal chloride of the metal to be recovered in the water immiscible solvent;
- (B) separating the water immiscible solvent from the aqueous solution comprising the mixture of metal chlorides;
- (C) contacting the water immiscible solvent, containing the neutral metal chloride complex, with an aqueous chloride washing solution to remove chloride ions from the water immiscible solvent and simultaneously chelating the cation of the metal to be recovered in solution in the water immiscible solvent;
- (D) contacting the water immiscible solvent containing the chelated cation of the metal to be recovered with an aqueous stripping solution to form an aqueous solution rich in the cation of the metal to be recovered and a water immiscible solvent containing a reduced amount of chelated cation of the metal to be recovered;
- (E) contacting the aqueous metal chloride solution in step (A) with the immiscible solvent containing a reduced amount of chelated cation of the metal to be recovered;
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- (F) recovering the metal from the aqueous solution rich in the cation of the metal to be recovered.
Dependencies are inferred from the claim text.