Extractants for palladium and method of rapidly separating...

Details Extractants for palladium and method of rapidly separating... Extractants for palladium and method of rapidly separating...

2011-04-05

2011-04-05

Lorengo, Jerry (Department: 1731)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C423S022000, C564S123000, C564S192000, C568S038000, C568S039000, C568S044000

Reexamination Certificate

active

07918918

ABSTRACT:
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 R3each 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.

REFERENCES:
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Narita et al., Solvent extraction of platinum group metals using amide compounds—Palladium extraction with N,N,N′,N′-tetra-n-octyl-thiodiglycolamide, Presented at Precios Metals '07 in Brisbane, Australia, Aug. 30-31, 2007.

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