Method for the Elution of Aluminum Ions and/or Zinc Ions

Patent metadata

Field	Value
Publication number	US-2025188564-A1
Application number	US-202318847523-A
Country	US
Kind code	A1
Filing date	Mar 16, 2023
Priority date	Mar 22, 2022
Publication date	Jun 12, 2025
Grant date	—

Abstract

The present invention relates to a method for the elution of aluminum ions and/or zinc ions of polymers containing aminomethylphosphonic acid groups.

First claim

1 . A process for elution of aluminum ions and/or zinc ions, comprising the steps of
admixing an aminomethylphosphonic acid group-containing polymer, or a salt thereof, at least partially laden with aluminum ions and/or zinc ions with a base selected from the group of consisting of alkali metal hydroxides, ammonium hydroxide, and mixtures thereof; and eluting the aluminum ions and/or zinc ions with a solution.

2 . The process as claimed in claim 1 , wherein aminomethylphosphonic acid group-containing polystyrene-divinylbenzene copolymers are used as the aminomethylphosphonic acid group-containing polymers.

3 . The process as claimed in claim 1 , wherein average degree of substitution of the aminomethyl groups by phosphonic acid groups in the aminomethylphosphonic acid group-containing polymers is 1.4 to 2.0.

4 . The process as claimed in claim 1 , wherein the base does not contain any potassium oxalate.

5 . The process as claimed in claim 1 , wherein particles of the polymer have a diameter (d 50 ) of 250 μm to 450 μm.

6 . The process as claimed in claim 5 , wherein at least 90% by volume or 90% by mass of the particles have a diameter within the interval of ±10% of the most common diameter.

7 . The process as claimed in claim 1 , wherein the eluting solution is an aqueous 6% by weight-12% by weight alkali metal hydroxide solution.

8 . The process as claimed in claim 1 , wherein aluminum ions are eluted.

9 . The process as claimed in claim 1 , wherein the aminomethylphosphonic acid group-containing polymer is a chelating resin containing functional groups of structural element (I)

in which is a polystyrene copolymer skeleton and
R 1 and R 2 may be identical or different and are independently —CH 2 PO(OX 1 ) 2 and —CH 2 PO(OH)OX 2 or hydrogen, where R 1 and R 2 may not both simultaneously be hydrogen and X 1 and X 2 are independently hydrogen, sodium, potassium or lithium.

10 . A process for elution of aluminum ions and/or zinc ions, comprising the steps of,
a.) bringing into contact with an aqueous metal ion solution containing aluminum ions and/or zinc ions and optionally further metal ions, at least one chelating resin containing functional groups of structural element (I)

in which is the polystyrene copolymer skeleton and
where R 1 and R 2 may not both simultaneously be hydrogen and X 1 and X 2 are independently hydrogen, sodium, potassium or lithium; and
b.) eluting the aluminum ions and/or zinc ions with an aqueous alkali metal hydroxide solution or/and an ammonium hydroxide solution.

11 . The process as claimed in claim 10 , wherein R 1 and R 2 may be identical or different and independently are —CH 2 PO(OX 1 ) 2 and —CH 2 PO(OH)OX 2 .

12 . The process as claimed in claim 11 , wherein X 1 and X 2 =H.

13 . The process as claimed in claim 10 , wherein the aqueous metal ion solution contains aluminum ions, nickel ions and cobalt ions.

14 . The process as claimed in claim 13 , wherein the molar ratio of the aluminum ions to the nickel ions and the cobalt ions is 0.5 to 1.5.

15 . The process as claimed in claim 10 , wherein the aqueous metal ion solution has a pH of 1.5 to 6.0.

Assignees

• Lanxess Deutschland Gmbh

Inventors

• Neufeind Stefan
• Steinhilber Dirk
• Kralik Joachim
• Makropoulos Pavlos

Classifications

• H01M10/54

  Reclaiming serviceable parts of waste accumulators · CPC title

• C22B21/0023

  from waste materials · CPC title

• C22B19/26

  Refining solutions containing zinc values, e.g. obtained by leaching zinc ores (treatment or purification of solutions by liquid-liquid extraction, by ion exchange or by adsorption C22B3/00) · CPC title

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title

• Y02P10/20

  Recycling · CPC title