Method for manufacturing recycled aluminum, manufacturing equipment, manufacturing system, recycled aluminum, and processed aluminum product

Patent metadata

Field	Value
Publication number	US-2023392273-A1
Application number	US-202118033516-A
Country	US
Kind code	A1
Filing date	Oct 28, 2021
Priority date	Oct 28, 2020
Publication date	Dec 7, 2023
Grant date	—

Abstract

A method for manufacturing recycled aluminum includes: disposing an aluminum alloy anode and a cathode in a facing manner in a molten salt, supplying a current between the aluminum alloy anode and the cathode at a temperature at which the aluminum alloy anode is in a solid state and the molten salt is in a liquid state to dissolve the aluminum alloy anode, and depositing an aluminum precipitate on the cathode.

First claim

1 . A method for manufacturing recycled aluminum, comprising:
disposing an aluminum alloy anode and a cathode in a molten salt in a facing manner; supplying a current between the aluminum alloy anode and the cathode at a temperature at which the aluminum alloy anode is in a solid state and the molten salt is in a liquid state to ionize and elute aluminum from the aluminum alloy anode; and depositing an aluminum precipitate on the cathode.

2 . The method for manufacturing recycled aluminum according to claim 1 , wherein
the aluminum alloy anode and the cathode have a flat plate shape, and the flat plate-shaped aluminum alloy anode and the flat plate-shaped cathode are disposed in a facing manner, or alternatively, the cathode has a rod shape, and a plate-shaped aluminum alloy anode disposed concentrically around the rod-shaped cathode face the cathode.

3 . The method for manufacturing recycled aluminum according to claim 1 , further comprising:
precipitating anode mud (anode slime) containing an impurity element that is not ionized from the aluminum alloy anode.

4 . The method for manufacturing recycled aluminum according to claim 1 , wherein
the aluminum alloy anode is manufactured by a method including an anode producing step of dissolving an aluminum alloy scrap to produce an anode.

5 . The method for manufacturing recycled aluminum according to claim 1 , wherein
a conductivity of the molten salt is 1 S m −1 or more.

6 . The method for manufacturing recycled aluminum according to claim 1 , wherein
the temperature is room temperature or higher and 660° C. or lower.

7 . The method for manufacturing recycled aluminum according to claim 1 , wherein
the molten salt contains AlF 3 in an amount of 1.5 mass % to 35 mass %.

8 . The method for manufacturing recycled aluminum according to claim 3 , further comprising:
taking out the precipitated anode mud.

9 . The method for manufacturing recycled aluminum according to claim 1 , wherein
a direction in which the aluminum alloy anode and the cathode are disposed in a facing manner is substantially the same as a direction of gravity.

10 . A manufacturing apparatus of recycled aluminum comprising:
a unit configured to dispose an aluminum alloy anode and a cathode in a facing manner in a molten salt, and supply a current between the aluminum alloy anode and the cathode at a temperature at which the aluminum alloy anode is in a solid state and the molten salt is in a liquid state, wherein the manufacturing apparatus of recycled aluminum is configured to ionize aluminum from the aluminum alloy anode and deposit aluminum on the cathode, and is configured to precipitate anode mud (anode slime) containing an impurity element which is not ionized from the aluminum alloy anode.

11 . The manufacturing apparatus of recycled aluminum according to claim 10 , wherein
a plurality of anodes and cathodes in which the aluminum alloy anode and the cathode are disposed in a facing manner are disposed in the molten salt.

12 . The manufacturing apparatus of recycled aluminum according to claim 11 , further comprising:
a unit configured to wire the plurality of anodes and cathodes in which the aluminum alloy anode and the cathode are disposed in a facing manner, and supply a current thereto in parallel or in series.

13 . A manufacturing system of recycled aluminum operable by wiring a plurality of the manufacturing apparatuses of recycled aluminum according to claim 12 serving as a single system.

14 . Recycled aluminum manufactured by the method for manufacturing recycled aluminum according to claim 1 .

15 . The recycled aluminum according to claim 14 , wherein
the recycled aluminum has a concentration of Si of 0.001 mass % or more and 1 mass % or less, and a concentration of Cu of 0.001 mass % or more and 0.5 mass % or less.

16 . A processed aluminum product obtained by processing the recycled aluminum according to claim 14 .

17 . An anode slime obtained by manufacturing recycled aluminum using the method for manufacturing recycled aluminum according to claim 1 .

Assignees

• Univ Tohoku

Inventors

• Nagasaka Tetsuya
• Zhu Hongmin
• Hiraki Takehito
• Lu Xin

Classifications

• C25C3/24 Primary

  Refining · CPC title

• C25C3/18

  Electrolytes · CPC title

• Y02P10/20

  Recycling · CPC title

• C22B21/0069

  from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents (C22B21/0046, C22B21/0053 and C22B21/0092 take precedence) · CPC title

• C25C3/08

  Cell construction, e.g. bottoms, walls, cathodes · CPC title