Method for recycling hydrogen fuel cell of new energy vehicle

Patent metadata

Field	Value
Publication number	US-11699796-B1
Application number	US-202118004042-A
Country	US
Kind code	B1
Filing date	Apr 30, 2021
Priority date	Jul 3, 2020
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

Disclosed is a method for recycling a hydrogen fuel cell of a new energy vehicle, including the following steps of: (1) discharging and disassembling a hydrogen fuel cell in turn to obtain a hydrogen supply system, an air supply system, a cooling system and a galvanic pile; (2) disassembling the galvanic pile into a catalyst and carbon cloth, and ashing to obtain ash; (3) adding an auxiliary agent into the ash, mixing, introducing inert gas, heating, introducing oxidizing gas, and absorbing tail gas by using an ammonium salt solution; and (4) adding a reducing agent into the ammonium salt solution absorbing the tail gas in step (3) to react, filtering, taking and cleaning a filter residue to obtain Pt.

First claim

The invention claimed is:

1. A method for recycling a hydrogen fuel cell, comprising:
(1) discharging and disassembling a hydrogen fuel cell to obtain a hydrogen supply system, an air supply system, a cooling system and a galvanic pile;
(2) disassembling the galvanic pile into a catalyst and carbon cloth, and ashing to obtain ash;
(3) adding an auxiliary agent into the ash, mixing, introducing inert gas, heating, introducing oxidizing gas, and absorbing tail gas by using an ammonium salt solution; and
(4) adding a reducing agent into the ammonium salt solution absorbing the tail gas in step (3) to react, filtering, taking and cleaning a filter residue to obtain Pt;
wherein in step (3), the auxiliary agent is one of NaF, CaF 2 , KCl, NaCl, or CaCl 2 .

2. The method of claim 1 , wherein in step (2), the ashing is carried out at a temperature of 400° C. to 600° C., and lasts for 30 minutes to 60 minutes.

3. The method of claim 1 , wherein in step (3), the oxidizing gas is one of chlorine gas or bromine gas.

4. The method of claim 1 , wherein in step (3), the oxidizing gas is one of nitrogen, helium or argon.

5. The method of claim 1 , wherein in step (3), the heating is carried out at a rate of 2° C.·min −1 to 6° C.·min −1 and a temperature of 1,000° C. to 1,200° C.

6. The method of claim 1 , wherein in step (4), the reducing agent is one of sodium thiosulfate, sodium borohydride or hydrazine.

7. The method of claim 1 , wherein in step (4), the ammonium salt solution is one of ammonium chloride solution or ammonium bromide solution.

8. The method of claim 1 , wherein in step (4), a further purification process of Pt after preparing Pt is as follows: adding a leachate into Pt, heating, washing, filtering, taking a filtrate, adding a reducing agent for reaction, filtering, taking and cleaning a filter residue to obtain pure Pt, wherein a mass ratio of Pt to the leachate is 1:(10 to 20).

9. The method of claim 8 , wherein the leachate is aqua regia, and the aqua regia has a mass concentration of 50% to 100%.

Assignees

• Guangdong Brunp Recycling Technology Co Ltd
• Hunan Brunp Recycling Tech Co Ltd
• Hunan Brunp Ev Recycling Co Ltd

Inventors

• Yu Haijun
• Peng Ting
• Xie Yinghao
• Zhang Xuemei

Classifications

• C22B7/007

  by acid leaching · CPC title

• C22B11/046

  from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths · CPC title

• H01M8/008 Primary

  Disposal or recycling of fuel cells · CPC title

• H01M4/92

  Metals of platinum group (H01M4/94 {, H01M4/9058} take precedence) · CPC title

• C22B3/44 Primary

  by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) · CPC title