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Title: Improved room-temperature-selectivity between Nd and Fe in Nd recovery from Nd-Fe-B magnet

The sustainable society requires the recycling of rare metals. Rare earth Nd is one of rare metals, accompanying huge consumption especially in Nd-Fe-B magnets. Although the wet process using acid is in practical use in the in-plant recycle of sludge, higher selectivity between Nd and Fe at room temperature is desired. We have proposed a pretreatment of corrosion before the dissolution into HCl and the oxalic acid precipitation. The corrosion produces γ-FeOOH and a Nd hydroxide, which have high selectivity for HCl solution at room temperature. Nd can be recovered as Mn{sub 2}O{sub 3}-type Nd{sub 2}O{sub 3}. The estimated recovery-ratio of Nd reaches to 97%.
Authors:
;  [1] ; ;  [2]
  1. Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka 811-0295 (Japan)
  2. Physonit Inc., 6-10 Minami-Horikawa, Kaita Aki, Hiroshima 736-0044 (Japan)
Publication Date:
OSTI Identifier:
22492196
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 11; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CORROSION; DISSOLUTION; HYDROCHLORIC ACID; HYDROXIDES; IRON BORIDES; MAGNETIC MATERIALS; MAGNETS; MANGANESE OXIDES; NEODYMIUM COMPOUNDS; NEODYMIUM OXIDES; OXALIC ACID; PRECIPITATION; SLUDGES; TEMPERATURE RANGE 0273-0400 K