Method for recovering rare earth elements from NdFeB waste and use of ferric oxide as raw material of manganese-zinc ferrite

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United States of America Patent

PATENT NO 12104225
APP PUB NO 20240200165A1
SERIAL NO

18316192

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Abstract

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Provided are a method and molten salt system for recovering rare earth elements from NdFeB waste and use of ferric oxide as a raw material of a manganese-zinc ferrite. The molten salt system comprising the following components in percentage by weight: 40% of K3AlF6 or Na3AlF6, 40% of KBe2F5, and 20% of KAlF4. By adopting the three-component molten salt system of the present invention, recovery rates of rare earth elements extracted from NdFeB waste all can reach 98% or above. By adopting the three-component molten salt system, extraction temperature is 100-400° C. lower than that of all current similar halogenation methods, and extraction time is fold shorted to 1-3 h. The reduction of the extraction temperature and the shortening of the melting time greatly reduce the energy consumption of extracting rare earth elements from NdFeB waste, and the economic benefits are remarkable.

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Patent Owner(s)

Patent OwnerAddress
CHONGQING UNIVERSITYNO 174 SHAZHENG STREET SHAPINGBA DISTRICT CHONGQING 400044
CHONGQING SHANGJIA ELECTRONIC CO LTDLONGQIAO INDUSTRIAL PARK FULING DISTRICT CHONGQING

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fu, Liang Chongqing, CN 21 201
Li, Ping Chongqing, CN 464 4732
Li, Shuchun Chongqing, CN 4 0
Liao, Xinren Chongqing, CN 3 0
Ma, Juncai Chongqing, CN 21 36
Pan, Fusheng Chongqing, CN 14 4
Xie, Hualin Chongqing, CN 2 0
Xu, Zhan Chongqing, CN 28 87

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