Reagent compositions for metal solvent extraction and methods of preparation and use thereof

Patent metadata

Field	Value
Publication number	US-2021381080-A1
Application number	US-201917282489-A
Country	US
Kind code	A1
Filing date	Oct 10, 2019
Priority date	Oct 12, 2018
Publication date	Dec 9, 2021
Grant date	—

Abstract

Disclosed are reagent compositions for metal solvent extraction and methods of preparation and use thereof. In certain embodiments, the disclosure relates to recovering metal values from an aqueous process stream using solvent extraction and employing a mixture of oxime reagents that synergistically improves metal recovery, rate of degradation and/or metal selectivity.

First claim

1 . A reagent composition comprising:
a mixture of at least two oximes, at least one first oxime having a structure represented by:

wherein R 1 is hydrogen or a C 1-22 linear or branched alkyl or alkenyl group,
R 2 , R 3 and R 4 are each independently hydrogen, a halogen, a linear or branched C 1-22 alkyl group, OR 6 wherein R 6 is a C 1-22 linear or branched alkyl group, a C 2-22 linear or branched alkenyl group, a C 6 aryl group, or a C 7-22 aralkyl group, wherein at least one of R 2 , R 3 or R 4 is not hydrogen; and

at least one second oxime having a structure represented by:

wherein R 5 is hydrogen or a C 1-22 linear or branched alkyl or alkenyl group,
R 6 , R 7 and R 8 are each independently hydrogen, a halogen, a linear or branched C 1-22 alkyl group, OR 10 wherein R 10 is a C 1-22 linear or branched alkyl group, a C 2-22 linear or branched alkenyl group, a C 6 aryl group, or a C 7-22 aralkyl group, wherein at least one of R 6 , R 7 or R 8 is not hydrogen, and
R 9 is a C 1-22 linear or branched alkyl or alkenyl group, and

wherein when R 1 is hydrogen, the reagent composition comprises less than about 70% by volume of the at least one first oxime,
wherein when R 1 is a C 1-22 linear or branched alkyl or alkenyl group, the reagent composition comprises less than about 85% by volume of the at least one first oxime,
wherein when R 5 is hydrogen, the reagent composition comprises at least about 15% by volume to less than about 70% by volume of the at least one second oxime, and
wherein when R 5 is a C 1-22 linear or branched alkyl or alkenyl group, the reagent composition comprises at least about 15% by volume of the at least one second oxime.

2 . The reagent composition of claim 1 , wherein the at least one first oxime has a structure selected from a group consisting of:

3 . The reagent composition of claim 1 , wherein the at least one second oxime has a structure selected from a group consisting of:

4 . The reagent composition of claim 1 , wherein the mixture comprises:

5 . The reagent composition of claim 4 , wherein (III) is at a concentration of about 0 wt % to about 50 wt %, (IV) is at a concentration of about 20 wt % to about 80 wt %, (V) is at a concentration of about 20 wt % to about 80 wt %, and (VI) is at a concentration of at least about 15 wt %.

6 . The reagent composition of claims 1 , wherein an amount of the reagent composition to provide a target recovery of metal from a process stream is less than an amount of a comparative reagent composition that does not comprise the mixture.

7 . The reagent composition of claim 6 , wherein the comparative reagent composition comprises a predetermined concentration of HNAO or NSAO or 3-MNSAO or 3-MHNAO, or a mixture thereof.

8 . The reagent composition of claim 6 , wherein the amount of the reagent composition to provide the target recovery of metal is at least about 2% by weight less than the amount of the comparative reagent composition to provide the target recovery, wherein the at least about 2% by weight is of a formulated volume of reagent (5.6 max load).

9 . The reagent composition of claim 1 , wherein at a target concentration, the reagent composition has a higher recovery of metal from a process stream than a comparative reagent composition that does not comprise the mixture.

10 . The reagent composition of claim 9 , wherein the reagent composition provides a recovery of at least about 4% by weight higher than the recovery of the comparative reagent composition.

11 . The reagent composition of claim 1 comprising:

12 . The reagent composition of claim 1 , wherein the reagent composition has less degradation than a comparative reagent composition that does not comprise the mixture.

13 . The reagent composition of claim 1 comprising:

14 . The reagent composition of claim 13 comprising about 10 wt % to about 70 wt % (IV), about 3 wt % to about 85 wt % (V) and about 7 wt % to about 70 wt % (VI).

15 . The reagent composition of claim 1 , wherein the reagent composition has a higher selectivity for copper over iron than a comparative reagent composition that does not comprise the mixture.

16 . The reagent composition of claims 6 , wherein the comparative reagent composition is selected from a group consisting of a standard ketoxime, a standard aldoxime, a mixture of two comparative substitutions of the first oxime and a mixture of two comparative substitutions of the second oxime.

17 . A method comprising:
preparing a reagent composition comprising a mixture of at least two oximes, the mixture comprising:
at least one first oxime having a structure represented by:

wherein le is hydrogen or a C 1-22 linear or branched alkyl or alkenyl group,
R 2 , R 3 and R 4 are each independently hydrogen, a halogen, a linear or branched C 1-22 alkyl group, OR 6 wherein R 6 is a C 1-22 linear or branched alkyl group, a C 2-22 linear or branched alkenyl group, a C 6 aryl group, or a C 7-22 aralkyl group, wherein at least one of R 2 , R 3 or R 4 is not hydrogen; and

at least one second oxime having a structure represented by:

wherein R 5 is hydrogen or a C 1-22 linear or branched alkyl or alkenyl group,
R 6 , R 7 and R 8 are each independently hydrogen, a halogen, a linear or branched C 1-22 alkyl group, OR 10 wherein R 10 is a C 1-22 linear or branched alkyl group, a C 2-22 linear or branched alkenyl group, a C 6 aryl group, or a C 7-22 aralkyl group, wherein at least one of R 6 , R 7 or R 8 is not hydrogen, and
R 9 is a C 1-22 linear or branched alkyl or alkenyl group.

18 - 31 . (canceled)

32 . A method of recovering a metal from an aqueous solution comprising metal values, the method comprising:
contacting the aqueous solution with an organic solution comprising an organic solvent and a dissolved reagent composition, wherein the reagent composition comprises a mixture of:
at least one first oxime having a structure represented by:

wherein R 1 is hydrogen or a C 1-22 linear or branched alkyl or alkenyl group,
R 2 , R 3 and R 4 are each independently hydrogen, a halogen, a linear or branched C 1-22 alkyl group, OR 6 wherein R 6 is a C 1-22 linear or branched alkyl group, a C 2-22 linear or branched alkenyl group, a C 6 aryl group, or a C 7-22 aralkyl group, wherein at least one of R 2 , R 3 or R 4 is not hydrogen; and
at least one second oxime having a structure represented by

Assignees

• Basf Se

Inventors

• Bender Jack

Classifications

• C07C251/48

  with the carbon atom of at least one of the oxyimino groups bound to a carbon atom of a six-membered aromatic ring · CPC title

• C22B15/0089

  by chemical methods · CPC title

• C22B15/00 Primary

  Obtaining copper · CPC title

• C22B3/30 Primary

  Oximes · CPC title

• C22B19/00

  Obtaining zinc or zinc oxide · CPC title