Title:
METHOD FOR RESOURCE RECYCLING OF NICKEL-IRON ALLOY AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2022/166023
Kind Code:
A1
Abstract:
A method for resource recycling of a nickel-iron alloy and use thereof. The method comprises the following steps: (1) ball-milling, pulverizing, and sieving a nickel-iron alloy to obtain a nickel-iron alloy powder; (2) leaching the nickel-iron alloy powder with an acid solution, heating and stirring, and filtering to obtain a leaching solution and a leaching residue; (3) adding a phosphorus source to the leaching solution, mixing and stirring, heating, and filtering to obtain iron phosphate and a post-precipitation solution; and (4) adding a neutralizing agent to the post-precipitation solution, heating and stirring, and filtering to obtain a nickel-containing solution. After the nickel-iron alloy is dissolved using the acid solution, iron phosphate is prepared under the effects of the phosphorus source or the phosphorus source plus an oxidant, and a precipitation aid. Further, a lithium iron phosphate positive electrode material can be prepared by using iron phosphate as a precursor of lithium iron phosphate. In addition, after impurities are removed from the post-precipitation solution, a nickel-containing solution having a relatively low impurity content can be obtained.
Inventors:
HE FANG (CN)
QIAO YANCHAO (CN)
CHEN RUOKUI (CN)
RUAN DINGSHAN (CN)
SHEN ZHIXIN (CN)
DENG HAOZHEN (CN)
LI CHANGDONG (CN)
QIAO YANCHAO (CN)
CHEN RUOKUI (CN)
RUAN DINGSHAN (CN)
SHEN ZHIXIN (CN)
DENG HAOZHEN (CN)
LI CHANGDONG (CN)
Application Number:
PCT/CN2021/093666
Publication Date:
August 11, 2022
Filing Date:
May 13, 2021
Export Citation:
Assignee:
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP EV RECYCLING CO LTD (CN)
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP EV RECYCLING CO LTD (CN)
International Classes:
C01B25/37; C22B3/06; C22B3/44; C22B23/00
Foreign References:
| CN101016581A | 2007-08-15 | |||
| CN106987728A | 2017-07-28 | |||
| CN102041381A | 2011-05-04 | |||
| CN111254281A | 2020-06-09 | |||
| US20170260606A1 | 2017-09-14 |
Attorney, Agent or Firm:
JIAQUAN IP LAW (CN)
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