TW200742621A - A method for the recycling of scrap Nd-Fe-B magnet - Google Patents

A method for the recycling of scrap Nd-Fe-B magnet

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Publication number
TW200742621A
TW200742621A TW095115674A TW95115674A TW200742621A TW 200742621 A TW200742621 A TW 200742621A TW 095115674 A TW095115674 A TW 095115674A TW 95115674 A TW95115674 A TW 95115674A TW 200742621 A TW200742621 A TW 200742621A
Authority
TW
Taiwan
Prior art keywords
recycling
boron
liquid
magnets
precipitants
Prior art date
Application number
TW095115674A
Other languages
Chinese (zh)
Other versions
TWI295591B (en
Inventor
Ching-Hwa Lee
Yu-Jung Chen
Shang-Lin Tsai
Tien-Chin Chang
Kuo-Shuh Fan
Original Assignee
Univ Da Yeh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Univ Da Yeh filed Critical Univ Da Yeh
Priority to TW95115674A priority Critical patent/TWI295591B/en
Publication of TW200742621A publication Critical patent/TW200742621A/en
Application granted granted Critical
Publication of TWI295591B publication Critical patent/TWI295591B/en

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Abstract

This invention provides a method for the recycling of scrap Nd-Fe-B magnets, characterized in that: first introducing the scrap Nd-Fe-B magnets into a heating furnace at 350 DEG C for 15 minutes for heating and demagnetizing the magents; grinding and sifting the demagnetized scrap Nd-Fe-B magnets through a sift of 50 mesh (0.297 mm) or less; introducing the ground and sifted particles into 3N sulfuric impregnation liquid so as to be subject to ultrasonic vibration, impregnation and etching for 15 minutes thereby achieving 100% impregnation and dissolving-out of neodymium, iron and boron. After collecting the impregnation liquid, its pH value is adjusted to 0.6 by sodium hydroxide. The liquid is then filtered after complete precipitation so as to obtain neodymium hydroxide precipitants of high purity, which precipitants can be sold to professional neodymium recycling and refining plants. The pH value of the filtered liquid containing iron and boron is then adjusted to 11 by sodium hydroxide. The liquid is then precipitated and filtered to obtain precipitants containing ferric hydroxide and boron, which precipitants can be sold to professional iron and boron recycling and refining plants. Nd-Fe-B magnets being processed by the recycling method of this invention allows recycling and reusing the neodymium, iron and boron resources.
TW95115674A 2006-05-01 2006-05-01 A method for the recycling of scrap nd-fe-b magnet TWI295591B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW95115674A TWI295591B (en) 2006-05-01 2006-05-01 A method for the recycling of scrap nd-fe-b magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW95115674A TWI295591B (en) 2006-05-01 2006-05-01 A method for the recycling of scrap nd-fe-b magnet

Publications (2)

Publication Number Publication Date
TW200742621A true TW200742621A (en) 2007-11-16
TWI295591B TWI295591B (en) 2008-04-11

Family

ID=45068487

Family Applications (1)

Application Number Title Priority Date Filing Date
TW95115674A TWI295591B (en) 2006-05-01 2006-05-01 A method for the recycling of scrap nd-fe-b magnet

Country Status (1)

Country Link
TW (1) TWI295591B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014064597A2 (en) 2012-10-24 2014-05-01 Commissariat A L'energie Atomique Et Aux Energies Alternatives Method for isolating rare earths and/or adjacent metal element(s) contained in the magnetic phase of permanent magnets
CN113333759A (en) * 2021-03-31 2021-09-03 宁波同创强磁材料有限公司 Recycling method of phosphated neodymium iron boron waste

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014064597A2 (en) 2012-10-24 2014-05-01 Commissariat A L'energie Atomique Et Aux Energies Alternatives Method for isolating rare earths and/or adjacent metal element(s) contained in the magnetic phase of permanent magnets
CN113333759A (en) * 2021-03-31 2021-09-03 宁波同创强磁材料有限公司 Recycling method of phosphated neodymium iron boron waste

Also Published As

Publication number Publication date
TWI295591B (en) 2008-04-11

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