A study on recovery of rare earth oxide powders from waste NiMH batteries (폐니켈수소전지로부터 희토류 산화물 분말의 회수에 대한 연구)

Nak-Kyoon Ahn (안낙균); Kim Dae Weon (김대원); Hyun-Woo Shim (심현우); Jae-Hun Park (박재훈); Jeung-Jin Park (박정진)

doi:10.6111/JKCGCT.2018.28.2.085

A study on recovery of rare earth oxide powders from waste NiMH batteries

Journal of the Korean Crystal Growth and Crystal Technology
Abbr : J. Korean Cryst. Growth Cryst. Technol.
2018, 28(2), pp.85~90
DOI : 10.6111/JKCGCT.2018.28.2.085
Publisher : The Korea Association Of Crystal Growth, Inc.
Research Area : Engineering > Materials Science and Engineering
Received : January 18, 2018
Accepted : February 25, 2018
Published : April 30, 2018

Nak-Kyoon Ahn ¹, Kim Dae Weon ², Hyun-Woo Shim ³, Jae-Hun Park ⁴, Jeung-Jin Park ⁴

¹고등기술연구원 신소재공정센터
²고등기술연구원연구조합
³고등기술연구원
⁴(주)엔코

Accredited

ABSTRACT

For the recovering rare earths in the spent nickel-metal hydride batteries, 10 M NaOH is added to the solution leached with sulfuric acid. The rare earth powders were precipitated at rate of 98 % at the condition of pH 2.0 or less. The recovered rare earth complex precipitate increased the leaching rate to nitric acid by heat treatment at 800 o C for 4 hours. Subsequently secondary precipitation was performed by adding oxalic acid to the solution in which the rare earth complex precipitate was dissolved. The re-precipitated rare earth powders were converted into oxide form through heat treatment at 800 o C for 4 hours with purity of 99.5 %.

KEYWORDS

NiMH batteries, Rare earth, Oxide power, Solvent extraction, Recovery

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Citation status

* References for papers published after 2025 are currently being built.

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