Palladium extractant and rapid separation and recovery method using the same

摘要

Provided is a novel extractant for palladium capable of improving an extraction rate compared to the conventional extractant, DHS, and also capable of back-extracting palladium using an ammonia solution, and a method of separating and recovering palladium using the novel extractant. The present invention provides a method for obtaining an aqueous solution containing palladium only by: bringing an acidic aqueous solution containing at least palladium into contact with an organic solution containing a sulfide-containing monoamide as an active integredient represented by the following structural formula (I), where R1, R2, and R3 each represent a group selected from a chain hydrocarbon group having 1 to 18 carbon atoms which may be branched, an alicyclic hydrocarbon group having 1 to 10 carbon atoms, and an aromatic hydrocarbon group having 1 to 14 carbon atoms, and n represents an integer of 1 to 4; extracting palladium into the organic solution; and conducting the back-extraction of the palladium extracted in the organic solution to an aqueous solution using an ammonia solution.