US 11,814,698 B2
Methods for simultaneous leaching and extraction of precious metals
Stephen Foley, Saskatoon (CA); Hiwa Salimi, Saskatoon (CA); and Loghman Moradi, Saskatoon (CA)
Assigned to EXCIR WORKS CORP., Calgary (CA)
Filed by EXCIR WORKS CORP., Calgary (CA)
Filed on Jun. 30, 2022, as Appl. No. 17/810,138.
Application 17/810,138 is a continuation of application No. 15/568,245, granted, now 11,427,886, previously published as PCT/CA2016/050459, filed on Apr. 21, 2016.
Claims priority of provisional application 62/152,066, filed on Apr. 24, 2015.
Claims priority of provisional application 62/150,513, filed on Apr. 21, 2015.
Prior Publication US 2022/0340998 A1, Oct. 27, 2022
Int. Cl. C22B 11/00 (2006.01); C22B 3/16 (2006.01); C22B 3/06 (2006.01); C22B 3/26 (2006.01); C22B 3/28 (2006.01); C22B 3/34 (2006.01); C22B 3/36 (2006.01); C22B 3/40 (2006.01); C22B 3/44 (2006.01); C07C 335/26 (2006.01); C07D 207/06 (2006.01); C07D 211/16 (2006.01); C07D 295/215 (2006.01); C22B 1/00 (2006.01); C25C 1/20 (2006.01); C25C 7/06 (2006.01)
CPC C22B 11/04 (2013.01) [C07C 335/26 (2013.01); C07D 207/06 (2013.01); C07D 211/16 (2013.01); C07D 295/215 (2013.01); C22B 1/00 (2013.01); C22B 3/06 (2013.01); C22B 3/16 (2013.01); C22B 3/1608 (2013.01); C22B 3/1616 (2013.01); C22B 3/1625 (2013.01); C22B 3/1666 (2013.01); C22B 3/26 (2021.05); C22B 3/28 (2021.05); C22B 3/282 (2021.05); C22B 3/284 (2021.05); C22B 3/34 (2021.05); C22B 3/36 (2021.05); C22B 3/406 (2021.05); C22B 3/44 (2013.01); C25C 1/20 (2013.01); C25C 7/06 (2013.01); Y02P 10/20 (2015.11)] 28 Claims
 
1. A method of leaching and extracting gold and/or palladium from a substance comprising gold and/or palladium, the method comprising:
treating the substance with a mixture comprising an aqueous phase and an organic phase,
wherein the aqueous phase comprises an acid and an oxidizing agent, and the organic phase comprises a water-immiscible organic solvent and a compound of Formula I:

OG Complex Work Unit Chemistry
wherein
R1 is —NR4R5 or aryl;
R2 and R3 are each independently selected from H, C1-10 alkyl, C3-10 cycloalkyl, C1-6 alkylene C3-10 cycloalkyl, heterocycloalkyl and aryl; or
R2 and R3 together with the nitrogen atom to which they are attached, form a heterocycloalkyl or a heteroaryl, or a heterocycloalkyl or a heteroaryl substituted at one or more carbon atoms with C1-4 alkyl;
R4 and R5 are each independently selected from H, C1-10 alkyl, C3-10 cycloalkyl, C1-6 alkylene C3-10 cycloalkyl, heterocycloalkyl and aryl; or
R4 and R5 together with the nitrogen atom to which they are attached, form a heterocycloalkyl or a heteroaryl, or a heterocycloalkyl or a heteroaryl substituted at one or more carbon atoms with C1-4alkyl;
X is O or S;
Y is S, NR6 or CR6R7; and
R6 and R7 are each independently selected from H, C1-10 alkyl, C3-10 cycloalkyl, C1-6 alkylene C3-10 cycloalkyl, heterocycloalkyl and aryl, and
the treating is under conditions to leach the gold and/or palladium from the substance and extract the leached gold and/or palladium by forming a complex between the leached gold and/or palladium and the compound of Formula I, in a single reaction vessel;
wherein the substance is an anode slime, electronic scrap, jewelry scrap, palladium-containing ore, or ore comprising gold and palladium.