Title:
METHOD FOR PREPARING HIGH-PURITY IRON PHOSPHATE BY USING FERROPHOSPHORUS WASTE
Document Type and Number:
WIPO Patent Application WO/2022/242186
Kind Code:
A1
Abstract:
Provided is a method for preparing high-purity iron phosphate by using ferrophosphorus waste. The method comprises: first mixing ferrophosphorus waste with an acid solution for dissolving and leaching, adding iron powder to the leaching solution to remove copper, then adding fluoride to remove aluminum, performing solid-liquid separation, adding an ion exchange resin to the filtrate to perform deep impurity removal to obtain a refined ferrophosphorus solution, adding a phosphorus source or an iron source to the refined ferrophosphorus solution to adjust an iron-phosphorus ratio, adding an alkali solution to adjust the pH, then performing a stirring reaction to obtain iron phosphate dihydrate, and roasting the iron phosphate dihydrate to obtain the iron phosphate. The process is simple, the recovery rate of the iron phosphate is greater than 98%, excessive impurity ions are not introduced in the whole process, the solution is subjected to two-step impurity removal to obtain the refined ferrophosphorus solution, and the iron phosphate is roasted subsequently to remove decomposable impurities in the iron phosphate, so that the iron phosphate having higher purity is obtained, and the impurity content of the product is lower than 300 ppm.
Inventors:
DUAN JINLIANG (CN)
LI CHANGDONG (CN)
XIA YANG (CN)
RUAN DINGSHAN (CN)
CHEN RUOKUI (CN)
QIAO YANCHAO (CN)
LI CHANGDONG (CN)
XIA YANG (CN)
RUAN DINGSHAN (CN)
CHEN RUOKUI (CN)
QIAO YANCHAO (CN)
Application Number:
PCT/CN2021/142929
Publication Date:
November 24, 2022
Filing Date:
December 30, 2021
Export Citation:
Assignee:
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP VEHICLES RECYCLING CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP VEHICLES RECYCLING CO LTD (CN)
International Classes:
C01B25/37; H01M10/54; H01M4/58
Foreign References:
| CN113277489A | 2021-08-20 | |||
| CN102956937A | 2013-03-06 | |||
| CN110527836A | 2019-12-03 | |||
| CN108069447A | 2018-05-25 | |||
| CN112607723A | 2021-04-06 | |||
| DE102014014894A1 | 2016-04-14 | |||
| CN112310500A | 2021-02-02 | |||
| CN110649343A | 2020-01-03 | |||
| CN110468280A | 2019-11-19 | |||
| CN106910889A | 2017-06-30 | |||
| CA2319285A1 | 2002-03-13 |
Other References:
WAN, QINGKE: "Study on the Process of Preparing Iron Phosphate from Spent Lithium Iron Phosphate Cathode Powder by Phosphoric Acid Method", KOREAN SOCIETY FOR PRECISION ENGINEERING, 1 July 2020 (2020-07-01), XP093005102, [retrieved on 20221205]
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
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