Title:
METHOD FOR RECOVERING MAGNESIUM OXIDE FROM FERRONICKEL SLAG
Document Type and Number:
WIPO Patent Application WO/2023/016056
Kind Code:
A1
Abstract:
The present invention belongs to the technical field of ferronickel recovery, and discloses a method for recovering magnesium oxide from ferronickel slag, the method comprising the steps of: crushing and drying ferronickel slag, adding acid, mixing, heating and reacting same, subjecting same to solid-liquid separation, and taking the liquid phase to obtain an acid water-washed solution; concentrating the acid water-washed solution, adding an alkali to adjust the pH, subjecting same to a precipitation reaction, and separating out the liquid phase to obtain an iron-aluminum-removed hydrochloric acid water-washed solution; adding the iron-aluminum-removed hydrochloric acid water-washed solution to a seed crystal and stirring same, introducing hydrogen chloride, and subjecting same to primary crystallization and suction filtering same to obtain magnesium chloride crystals; and subjecting same to secondary crystallization, and then heat-decomposing same to obtain magnesium oxide. According to the present invention, the ferronickel slag is leached by means of acid at a normal pressure, then has an alkali added thereto to adjust the pH, is subjected to a precipitation reaction for removing iron and aluminum, and is subjected to primary crystallization, on the premise of being loaded with seed crystals, and then secondary crystallization, so as to obtain the high-purity magnesium oxide while increasing the recovery rate of magnesium.
Inventors:
YU HAIJUN (CN)
ZHONG YINGSHENG (CN)
XIE YINGHAO (CN)
LI AIXIA (CN)
ZHANG XUEMEI (CN)
LI CHANGDONG (CN)
ZHONG YINGSHENG (CN)
XIE YINGHAO (CN)
LI AIXIA (CN)
ZHANG XUEMEI (CN)
LI CHANGDONG (CN)
Application Number:
PCT/CN2022/095677
Publication Date:
February 16, 2023
Filing Date:
May 27, 2022
Export Citation:
Assignee:
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP EV RECYCLING CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP EV RECYCLING CO LTD (CN)
International Classes:
C01F5/06; C01F5/30; C22B7/00; C22B7/04; C22B26/22
Foreign References:
| CN113735146A | 2021-12-03 | |||
| JP2014205133A | 2014-10-30 | |||
| CN104773744A | 2015-07-15 | |||
| CN105483381A | 2016-04-13 | |||
| CN108328659A | 2018-07-27 | |||
| US4944928A | 1990-07-31 |
Attorney, Agent or Firm:
JIAQUAN IP LAW (CN)
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