Metal recovery method and metal recovery device

Patent metadata

Field	Value
Publication number	US-2024254643-A1
Application number	US-202318400332-A
Country	US
Kind code	A1
Filing date	Dec 29, 2023
Priority date	Jan 20, 2023
Publication date	Aug 1, 2024
Grant date	—

Abstract

A metal recovery method includes causing a metal recovery device including a power source, an electronic load, an electrolytic solution, a first tank that includes an anode, a first supply port for H 2 O and a first discharge port and that is immersed in the electrolytic solution, the anode being connected to the power source and the electronic load and containing at least Co, and a second tank that includes a cathode, a second supply port for H 2 O and a second discharge port and that is immersed in the electrolytic solution, the cathode being connected to the power source and the electronic load, to recover Co eluted from the anode by maintaining voltage by the power source and the electronic load such that a potential of the anode is higher than a potential of the cathode.

First claim

What is claimed is:

1 . A metal recovery method comprising
causing a metal recovery device that includes
a power source,
an electronic load,
an electrolytic solution,
a first tank that includes an anode, a first supply port for H 2 O and a first discharge port, and that is immersed in the electrolytic solution, the anode being connected to the power source and the electronic load and containing at least Co, and
a second tank that includes a cathode, a second supply port for H 2 O and a second discharge port, and that is immersed in the electrolytic solution, the cathode being connected to the power source and the electronic load,
to recover Co eluted from the anode by maintaining voltage by the power source and the electronic load such that a potential of the anode is higher than a potential of the cathode.

2 . The method according to claim 1 , wherein the anode contains Ni, and
the method further comprises recovering residual Ni in the anode by maintaining the voltage by the power source and the electronic load such that the potential of the anode is higher than the potential of the cathode.

3 . The method according to claim 1 , wherein at least one of the first tank and the second tank is a nickel-metal hydride storage battery.

4 . The method according to claim 3 , wherein the nickel-metal hydride storage battery is a used storage battery.

5 . The method according to claim 1 , further comprising maintaining the voltage such that water electrolysis reaction occurs, extracting O 2 gas from the first tank, and extracting H 2 gas from the second tank.

6 . A metal recovery device, comprising:
a power source; an electronic load; an electrolytic solution; a first tank that includes an anode, a first supply port for H 2 O and a first discharge port, and that is immersed in the electrolytic solution, the anode being connected to the power source and the electronic load and contains at least Co; and a second tank that includes a cathode, a second supply port for H 2 O and a second discharge port, and that is immersed in the electrolytic solution, the cathode being connected to the power source and the electronic load, wherein the metal recovery device is configured to recover Co eluted from the anode by maintaining voltage by the power source and the electronic load such that a potential of the anode is higher than a potential of the cathode.

7 . The metal recovery device according to claim 6 , wherein the anode contains Ni, and
the metal recovery device is configured to recover residual Ni in the anode by maintaining the voltage by the power source and the electronic load such that the potential of the anode is higher than the potential of the cathode.

8 . The metal recovery device according to claim 6 , wherein at least one of the first tank and the second tank is a nickel-metal hydride storage battery.

9 . The metal recovery device according to claim 8 , wherein the nickel-metal hydride storage battery is a used storage battery.

10 . The metal recovery device according to claim 6 , wherein the metal recovery device is configured to maintain the voltage such that water electrolysis reaction occurs, extract O 2 gas from the first tank, and extract H 2 gas from the second tank.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nakanishi Haruyuki

Classifications

• C22B23/04

  by wet processes (recovery or separation of nickel or cobalt using organic agents C22B3/00) · CPC title

• C22B7/006

  Wet processes · CPC title

• H01M10/54 Primary

  Reclaiming serviceable parts of waste accumulators · CPC title

• Y02P10/20

  Recycling · CPC title

• Y02W30/84

  Recycling of batteries or fuel cells · CPC title