C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/369
C22B 3/00 (2006.01)
Patent
CA 1045832
ABSTRACT OF THE DISCLOSURE This invention relates to and discloses a novel process for extraction and separation of metals utilizing the advantages of liquid-liquid extraction with cation exchangers without requiring the equivalent addition of alkali. The process comprises leaching the raw material with aqueous mineral acid, thereby forming an aqueous metal salt solution, extracting the metals including iron from said aqueous solution by contacting said solution with an organic liquid phase consisting of a cation exchanger component selected from the group consisting of organic carboxylic acids and alkyl phosphoric acids in solution in an organic solvent, the organic liquid phase containing a complex between at least one of the desired metals and the cation exchanger component, the complex having been formed by contacting said organic liquid phase with a desired metal- containing material which is different from the starting raw material to be leached, whereby the metals are exchanged between the organic phase and the aqueous phase and any iron present is transferred to the organic phase and forms a complex with the cation exchanger component and the desired metal of the complex passes from the organic phase to the aqueous solution, and then recovering desired metals from the aqueous solution.
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